---
_id: '63765'
abstract:
- lang: eng
text: Rubber-metal bushings (RMB) are critical components in multi-body systems,
such as vehicles and industrial machinery, due to their ability to enable relative
motion, dampen vibrations, and transmit forces. However, their nonlinear behavior
challenges accurate modeling. Traditional physics-based models often fail to balance
simplicity, accuracy, and computational efficiency. The growing availability of
experimental data offers opportunities to improve RMB modeling through hybrid
and data-driven approaches. This study evaluates physics-based, hybrid, and data-driven
methods based on predictive accuracy, modeling effort, and computational cost.
Hybrid approaches, combining machine learning techniques with physics-based models,
are investigated to leverage their complementary strengths. Results show that
hybrid methods enhance accuracy for simpler models with a modest increase in computational
time. This highlights their potential to simplify RMB modeling while balancing
accuracy and efficiency, offering insights for advancing multi-body system simulations.
Building on these insights, data-driven methods are explored for their ability
to provide surrogate models for dynamical systems without requiring expert knowledge.
Experiments reveal that while simple data-driven methods approximate system behavior
when data has low variance, they fail with trajectories of widely varying frequency
and amplitude.
author:
- first_name: Meike Claudia
full_name: Wohlleben, Meike Claudia
id: '43991'
last_name: Wohlleben
orcid: 0009-0009-9767-7168
- first_name: Jan
full_name: Schütte, Jan
id: '22109'
last_name: Schütte
orcid: 0000-0001-9025-9742
- first_name: Manuel Bastian
full_name: Berkemeier, Manuel Bastian
last_name: Berkemeier
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Sebastian
full_name: Peitz, Sebastian
last_name: Peitz
citation:
ama: Wohlleben MC, Schütte J, Berkemeier MB, Sextro W, Peitz S. Evaluating Physics-Based,
Hybrid, and Data-Driven Models for Rubber-Metal Bushings. Multibody System
Dynamics. Published online 2026:1–21. doi:10.1007/s11044-026-10146-9
apa: Wohlleben, M. C., Schütte, J., Berkemeier, M. B., Sextro, W., & Peitz,
S. (2026). Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal
Bushings. Multibody System Dynamics, 1–21. https://doi.org/10.1007/s11044-026-10146-9
bibtex: '@article{Wohlleben_Schütte_Berkemeier_Sextro_Peitz_2026, title={Evaluating
Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings}, DOI={10.1007/s11044-026-10146-9},
journal={Multibody System Dynamics}, author={Wohlleben, Meike Claudia and Schütte,
Jan and Berkemeier, Manuel Bastian and Sextro, Walter and Peitz, Sebastian}, year={2026},
pages={1–21} }'
chicago: Wohlleben, Meike Claudia, Jan Schütte, Manuel Bastian Berkemeier, Walter
Sextro, and Sebastian Peitz. “Evaluating Physics-Based, Hybrid, and Data-Driven
Models for Rubber-Metal Bushings.” Multibody System Dynamics, 2026, 1–21.
https://doi.org/10.1007/s11044-026-10146-9.
ieee: 'M. C. Wohlleben, J. Schütte, M. B. Berkemeier, W. Sextro, and S. Peitz, “Evaluating
Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings,” Multibody
System Dynamics, pp. 1–21, 2026, doi: 10.1007/s11044-026-10146-9.'
mla: Wohlleben, Meike Claudia, et al. “Evaluating Physics-Based, Hybrid, and Data-Driven
Models for Rubber-Metal Bushings.” Multibody System Dynamics, 2026, pp.
1–21, doi:10.1007/s11044-026-10146-9.
short: M.C. Wohlleben, J. Schütte, M.B. Berkemeier, W. Sextro, S. Peitz, Multibody
System Dynamics (2026) 1–21.
date_created: 2026-01-27T15:51:55Z
date_updated: 2026-03-03T06:31:03Z
department:
- _id: '151'
doi: 10.1007/s11044-026-10146-9
language:
- iso: eng
page: 1–21
publication: Multibody System Dynamics
publication_identifier:
issn:
- 1384-5640
quality_controlled: '1'
status: public
title: Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings
type: journal_article
user_id: '43991'
year: '2026'
...
---
_id: '64826'
author:
- first_name: Max
full_name: Kelber, Max
id: '70188'
last_name: Kelber
- first_name: Steffen
full_name: Brück, Steffen
last_name: Brück
- first_name: Nishant
full_name: Bhardwaj, Nishant
last_name: Bhardwaj
- first_name: Osarenren Kennedy
full_name: Aimiyekagbon, Osarenren Kennedy
id: '9557'
last_name: Aimiyekagbon
- first_name: Rolf
full_name: Naumann, Rolf
last_name: Naumann
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Kelber M, Brück S, Bhardwaj N, Aimiyekagbon OK, Naumann R, Sextro W. Methodik
zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer
Schwingungsmessungen an einer ortsfesten Messstelle. In: Hochschule für Technik
und Wirtschaft Dresden, Fakultät Maschinenbau, ed. Tagungsband Rad-Schiene-Tagung
2026. DVV Media Group GmbH - Eurailpress; 2026:206 – 208.'
apa: Kelber, M., Brück, S., Bhardwaj, N., Aimiyekagbon, O. K., Naumann, R., &
Sextro, W. (2026). Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen
auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle. In Hochschule
für Technik und Wirtschaft Dresden, Fakultät Maschinenbau (Ed.), Tagungsband
Rad-Schiene-Tagung 2026 (pp. 206 – 208). DVV Media Group GmbH - Eurailpress.
bibtex: '@inproceedings{Kelber_Brück_Bhardwaj_Aimiyekagbon_Naumann_Sextro_2026,
place={Hamburg}, title={Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen
auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle}, booktitle={Tagungsband
Rad-Schiene-Tagung 2026}, publisher={DVV Media Group GmbH - Eurailpress}, author={Kelber,
Max and Brück, Steffen and Bhardwaj, Nishant and Aimiyekagbon, Osarenren Kennedy
and Naumann, Rolf and Sextro, Walter}, editor={Hochschule für Technik und Wirtschaft
Dresden, Fakultät Maschinenbau}, year={2026}, pages={206 – 208} }'
chicago: 'Kelber, Max, Steffen Brück, Nishant Bhardwaj, Osarenren Kennedy Aimiyekagbon,
Rolf Naumann, and Walter Sextro. “Methodik zur Untersuchung der Fahrwerksparameter
von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten
Messstelle.” In Tagungsband Rad-Schiene-Tagung 2026, edited by Hochschule
für Technik und Wirtschaft Dresden, Fakultät Maschinenbau, 206 – 208. Hamburg:
DVV Media Group GmbH - Eurailpress, 2026.'
ieee: M. Kelber, S. Brück, N. Bhardwaj, O. K. Aimiyekagbon, R. Naumann, and W. Sextro,
“Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis
optischer Schwingungsmessungen an einer ortsfesten Messstelle,” in Tagungsband
Rad-Schiene-Tagung 2026, Dresden, 2026, pp. 206 – 208.
mla: Kelber, Max, et al. “Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen
auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle.” Tagungsband
Rad-Schiene-Tagung 2026, edited by Hochschule für Technik und Wirtschaft Dresden,
Fakultät Maschinenbau, DVV Media Group GmbH - Eurailpress, 2026, pp. 206 – 208.
short: 'M. Kelber, S. Brück, N. Bhardwaj, O.K. Aimiyekagbon, R. Naumann, W. Sextro,
in: Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau (Ed.),
Tagungsband Rad-Schiene-Tagung 2026, DVV Media Group GmbH - Eurailpress, Hamburg,
2026, pp. 206 – 208.'
conference:
end_date: 2026-03-06
location: Dresden
name: 21. Internationale Schienenfahrzeugtagung Dresden 4.-6. März 2026
start_date: 2026-03-04
corporate_editor:
- Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau
date_created: 2026-03-04T10:26:27Z
date_updated: 2026-03-04T10:38:28Z
department:
- _id: '151'
language:
- iso: ger
page: 206 – 208
place: Hamburg
popular_science: '1'
project:
- _id: '1355'
name: enableATO – Automatisierter Bahnverkehr als Backbone für eine nachhaltige,
vernetzte Mobilität im ländlichen Raum
publication: Tagungsband Rad-Schiene-Tagung 2026
publication_identifier:
isbn:
- 978-3-96892-332-1
publication_status: published
publisher: DVV Media Group GmbH - Eurailpress
status: public
title: Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf
Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle
type: conference
user_id: '70188'
year: '2026'
...
---
_id: '58510'
abstract:
- lang: eng
text: 'Today’s ultrasonic transducers find broad application in diverse
technology branches and most often cannot be replaced by other actuators. They
are typically based on lead-containing piezoelectric ceramics. These should be
replaced for environmental and health issues by lead-free alternatives. Multiple
material alternatives are already known, but there is a lack of information about
their technological readiness level. To fill this gap, a small series of prestressed
longitudinally vibrating transducers was set up with a standard PZT material and
two lead-free variants within this study. The entire process for building the
transducers is documented: characteristics of individual ring ceramics, burn-in
results, and free vibration and characteristics under load are shown. The main
result is that the investigated lead-free materials are ready to use within ultrasonic
bolted Langevin transducers (BLTs) for medium-power applications, when the geometrical
setup of the transducer is adopted. Since lead-free ceramics need higher voltages
to achieve the same power level, the driving electronics or the mechanical setup
must be altered specifically for each material. Lower self-heating of the lead-free
materials might be attractive for heat-sensitive processes.'
article_number: '55'
article_type: original
author:
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Scheidemann C, Bornmann P, Littmann W, Hemsel T. Lead-Free Ceramics in Prestressed
Ultrasonic Transducers. Actuators. 2025;14(2). doi:10.3390/act14020055
apa: Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free
Ceramics in Prestressed Ultrasonic Transducers. Actuators, 14(2),
Article 55. https://doi.org/10.3390/act14020055
bibtex: '@article{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Lead-Free Ceramics
in Prestressed Ultrasonic Transducers}, volume={14}, DOI={10.3390/act14020055},
number={255}, journal={Actuators}, publisher={MDPI AG}, author={Scheidemann, Claus
and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}, year={2025} }'
chicago: Scheidemann, Claus, Peter Bornmann, Walter Littmann, and Tobias Hemsel.
“Lead-Free Ceramics in Prestressed Ultrasonic Transducers.” Actuators 14,
no. 2 (2025). https://doi.org/10.3390/act14020055.
ieee: 'C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Lead-Free Ceramics
in Prestressed Ultrasonic Transducers,” Actuators, vol. 14, no. 2, Art.
no. 55, 2025, doi: 10.3390/act14020055.'
mla: Scheidemann, Claus, et al. “Lead-Free Ceramics in Prestressed Ultrasonic Transducers.”
Actuators, vol. 14, no. 2, 55, MDPI AG, 2025, doi:10.3390/act14020055.
short: C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, Actuators 14 (2025).
date_created: 2025-02-04T13:43:23Z
date_updated: 2025-02-04T13:46:41Z
department:
- _id: '151'
doi: 10.3390/act14020055
intvolume: ' 14'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.mdpi.com/2076-0825/14/2/55
oa: '1'
publication: Actuators
publication_identifier:
issn:
- 2076-0825
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Lead-Free Ceramics in Prestressed Ultrasonic Transducers
type: journal_article
user_id: '210'
volume: 14
year: '2025'
...
---
_id: '64787'
abstract:
- lang: eng
text: This study proposes a fault diagnostics methodology that addresses the challenges
posed by highly imbalanced datasets typical of railway applications, where faulty
conditions constitute the minority class. Fault diagnostics is performed from
the component level upward, considering each sensor’s proximity to its respective
critical component. Advanced signal analysis, feature engineering, and automated
data-driven model generation techniques were explored to achieve comprehensive
diagnostics, such that the model development process accounts for variations in
the operating conditions and differing levels of information availability. The
proposed methodology is evaluated on datasets from the MONOCAB, for scenarios
with limited faulty instances and on the Beijing 2024 IEEE PHM Conference data
challenge, which focused on fault diagnostics of railway systems under various
fault modes and operating conditions.
article_number: '1'
author:
- first_name: Osarenren Kennedy
full_name: Aimiyekagbon, Osarenren Kennedy
id: '9557'
last_name: Aimiyekagbon
- first_name: Alexander
full_name: Löwen, Alexander
id: '47233'
last_name: Löwen
- first_name: Raphael
full_name: Hanselle, Raphael
last_name: Hanselle
- first_name: Thomas
full_name: Rief, Thomas
last_name: Rief
- first_name: Maximilian
full_name: Beck, Maximilian
last_name: Beck
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Aimiyekagbon OK, Löwen A, Hanselle R, Rief T, Beck M, Sextro W. Multilevel
fault diagnostics for railway applications using limited historical data. In:
PHM Society Asia-Pacific Conference. Vol 5. ; 2025. doi:10.36001/phmap.2025.v5i1.4449'
apa: Aimiyekagbon, O. K., Löwen, A., Hanselle, R., Rief, T., Beck, M., & Sextro,
W. (2025). Multilevel fault diagnostics for railway applications using limited
historical data. PHM Society Asia-Pacific Conference, 5, Article
1. https://doi.org/10.36001/phmap.2025.v5i1.4449
bibtex: '@inproceedings{Aimiyekagbon_Löwen_Hanselle_Rief_Beck_Sextro_2025, title={Multilevel
fault diagnostics for railway applications using limited historical data}, volume={5},
DOI={10.36001/phmap.2025.v5i1.4449},
number={1}, booktitle={PHM Society Asia-Pacific Conference}, author={Aimiyekagbon,
Osarenren Kennedy and Löwen, Alexander and Hanselle, Raphael and Rief, Thomas
and Beck, Maximilian and Sextro, Walter}, year={2025} }'
chicago: Aimiyekagbon, Osarenren Kennedy, Alexander Löwen, Raphael Hanselle, Thomas
Rief, Maximilian Beck, and Walter Sextro. “Multilevel Fault Diagnostics for Railway
Applications Using Limited Historical Data.” In PHM Society Asia-Pacific Conference,
Vol. 5, 2025. https://doi.org/10.36001/phmap.2025.v5i1.4449.
ieee: 'O. K. Aimiyekagbon, A. Löwen, R. Hanselle, T. Rief, M. Beck, and W. Sextro,
“Multilevel fault diagnostics for railway applications using limited historical
data,” in PHM Society Asia-Pacific Conference, 2025, vol. 5, doi: 10.36001/phmap.2025.v5i1.4449.'
mla: Aimiyekagbon, Osarenren Kennedy, et al. “Multilevel Fault Diagnostics for Railway
Applications Using Limited Historical Data.” PHM Society Asia-Pacific Conference,
vol. 5, 1, 2025, doi:10.36001/phmap.2025.v5i1.4449.
short: 'O.K. Aimiyekagbon, A. Löwen, R. Hanselle, T. Rief, M. Beck, W. Sextro, in:
PHM Society Asia-Pacific Conference, 2025.'
date_created: 2026-02-27T20:41:54Z
date_updated: 2026-02-27T20:46:44Z
department:
- _id: '151'
doi: 10.36001/phmap.2025.v5i1.4449
intvolume: ' 5'
keyword:
- MONOCAB
- Beijing Data Challenge
- Diagnostics of railway systems
language:
- iso: eng
project:
- _id: '1355'
name: enableATO – Automatisierter Bahnverkehr als Backbone für eine nachhaltige,
vernetzte Mobilität im ländlichen Raum
publication: PHM Society Asia-Pacific Conference
publication_status: published
quality_controlled: '1'
status: public
title: Multilevel fault diagnostics for railway applications using limited historical
data
type: conference
user_id: '9557'
volume: 5
year: '2025'
...
---
_id: '64798'
abstract:
- lang: eng
text: "Lead-containing piezoelectric ceramics are still the base for today’s ultrasonic
transducers used in broad applications. This is partly due to missing powerful
lead-free piezoelectric ceramic parts in the commercial market. There has been
much research on lead-free materials but developing them into marketable parts
seems to be an ongoing process. The actual exemption of ROHS has expired, but
as the new exemption has already been requested, ceramic suppliers keep on selling
lead containing products. Nevertheless, these should be replaced by lead-free
alternatives for environmental and health issues. \r\nThis contribution focuses
on exploring the technological readiness level of lead-free hard piezoceramics
for prestressed ultrasonic transducers. A small series of bolted Langevin transducers
was set up with standard PZT material and three commercial lead-free variants.
Results of the building process from individual ring ceramic characteristics to
transducer load tests are presented. The main finding of this study is that the
lead-free materials technically can compete with the standard PZT for medium-power
applications. Some adaptations in the ultrasonic system must be done: the geometry
must be altered to fit resonance frequency, and higher voltages or thinner ceramics
are needed to achieve the same vibration level at low load. For reaching same
power, the volume of lead-free ceramics must be 1.5 to 3 times larger. As already
promoted in literature, mechanical losses at high vibration levels are smaller
for the lead-free materials. This might help to argument lead-free piezoelectric
materials in some applications.\r\n\r\nReferences\r\n1.\tDirective 2011/65/EU
of the European Parliament and of the Council of 8 June 2011 on the Restriction
of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment.
EUR-Lex Document 02011L0065-20240801. Available online: http://data.europa.eu/eli/dir/2011/65/2024-08-01
(accessed on 24 January 2025).\r\n2.\tLangevin, P. (1918) Method and Apparatus
for Transmitting and Receiving Submarine Elastic Waves Using the Piezoelectric
Properties of Quartz. French Patent Office; Patent No. FR505703.\r\n3.\tHemsel,
T.; Twiefel, J. (2023) Piezoelectric Ultrasonic Power Transducers. In Encyclopedia
of Materials: Electronics; Academic Press: Oxford, UK; pp. 276–285. https://doi.org/10.1016/b978-0-12-819728-8.00047-4.\r\n4.\tATHENA
Technologie Beratung GmbH (2025) Description of Ultrasound Generator. Available
online: http://shop.myathena.de/epages/12074748.sf/de_DE/?ObjectPath=/Shops/12074748/Products/AM200
(accessed on 13 January 2025).\r\n5.\tLittmann, W.; Hemsel, T.; Kauczor, C.; Wallaschek,
J.; Sinha, W. (2003) Load-adaptive phase-controller for resonant driven piezoelectric
devices. Proc. World Congr. Ultrason. 2003, 48, 547–550.\r\n6.\tScheidemann, C.,
Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free Ceramics in Prestressed
Ultrasonic Transducers. Actuators, 14(2), 55. https://doi.org/10.3390/act14020055\r\n"
author:
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: 'Scheidemann C, Bornmann P, Littmann W, Hemsel T. Bolted Langevin transducers
with leadfree piezoelectric ceramics. In: ; 2025.'
apa: Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Bolted
Langevin transducers with leadfree piezoelectric ceramics. International Workshop
on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania.
bibtex: '@inproceedings{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Bolted
Langevin transducers with leadfree piezoelectric ceramics}, author={Scheidemann,
Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}, year={2025}
}'
chicago: Scheidemann, Claus, Peter Bornmann, Walter Littmann, and Tobias Hemsel.
“Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics,” 2025.
ieee: C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Bolted Langevin
transducers with leadfree piezoelectric ceramics,” presented at the International
Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius,
Lithuania, 2025.
mla: Scheidemann, Claus, et al. Bolted Langevin Transducers with Leadfree Piezoelectric
Ceramics. 2025.
short: 'C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, in: 2025.'
conference:
end_date: 2025-07-03
location: Vilnius, Lithuania
name: International Workshop on Piezoelectric Materials and Applications in Actuators
(IWPMA)
start_date: 2025-07-01
date_created: 2026-03-02T10:39:40Z
date_updated: 2026-03-02T11:04:56Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: open_access
content_type: application/pdf
creator: hemsel
date_created: 2026-03-02T10:37:46Z
date_updated: 2026-03-02T11:00:37Z
file_id: '64799'
file_name: IWPMA_2025_Hemsel.pdf
file_size: 1812289
relation: main_file
file_date_updated: 2026-03-02T11:00:37Z
has_accepted_license: '1'
keyword:
- lead free piezoelectric ceramics
- bolted Langevin transducer
- medium power ultrasound.
language:
- iso: eng
oa: '1'
status: public
title: Bolted Langevin transducers with leadfree piezoelectric ceramics
type: conference
user_id: '210'
year: '2025'
...
---
_id: '64800'
abstract:
- lang: eng
text: "Intensive ultrasonic cleaning of surfaces by means of a lead-free ultrasonic
transducer with focusing sonotrode\r\nUltrasonic cleaning baths are probably a
coincidental development: After underwater sonars had already been successfully
used to detect submarines before 1920, it was probably observed in this environment
that the ultrasonic oscillators not only showed a self-cleaning effect but also
cavitation damage. At the beginning of the 1950s, the first ultrasonic cleaning
devices finally came onto the market. Today, the range of applications ranges
from household appliances for jewellery and eyewear cleaning to classic cleaning
baths for metal parts and systems for cleaning highly sensitive electronic components.
There is a certain gap in handheld, mobile cleaning equipment. Although devices
for spot cleaning of textiles are known, the cleaning effect is usually low. \r\nDue
to the directive 2011/65/EU on the restriction of the use of hazardous substances
in electrical and electronic equipment (RoHS) [1] lead should no longer be used
in technical devices. As today’s standard ceramics for medium and high-power ultrasonic
transducers typically contain lead, there is a need to explore the use of lead-free
ceramics in this field. Honda [2] already offers a cleaning transducer based on
lead-free piezoelectric ceramics, but it is designed to be used in cleaning baths.\r\nThis
article presents the model-based development of a highly innovative ultrasonic
cleaner. On the one hand, lead-free piezoelectric ceramics are used, and on the
other hand, a special sonotrode has been developed that concentrates the sound
in such a way that a strong cavitation and thus cleaning effect is achieved with
comparatively low power in a short time. Coupled field finite element method was
used to find an appropriate geometry for the focussing sonotrode. The comparison
of simulation and measurement results shows that the lead-free piezoceramics used
do their job well and can keep up with standard ceramics, but more ceramic volume
is needed to achieve same power. An advanced control concept was elaborated to
ensure continuous hard cavitation at varying distances between the sonotrode and
the part to be cleaned. Cleaning results for different surfaces and contaminations
are presented. The concept of the focusing sonotrode shows that a convincing cleaning
result can be achieved even with low power and in short time, provided that the
oscillation system and control electronics are suitably coordinated.\r\n\r\nReferences\r\n[1]
http://data.europa.eu/eli/dir/2011/65/2024-08-01 \r\n[2] https://en.honda-el.co.jp/product/ceramics/lineup/lead_off/lead-off
\r\n"
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Hemsel T, Scheidemann C, Bornmann P, Littmann W, Sextro W. Intensive ultrasonic
cleaning of surfaces by means of lead-free ultrasonic transducer with focussing
sonotrode. In: ; 2025.'
apa: Hemsel, T., Scheidemann, C., Bornmann, P., Littmann, W., & Sextro, W. (2025).
Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic
transducer with focussing sonotrode. International Congress on Ultrasonics
(ICU), Paderborn, Germany.
bibtex: '@inproceedings{Hemsel_Scheidemann_Bornmann_Littmann_Sextro_2025, title={Intensive
ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with
focussing sonotrode}, author={Hemsel, Tobias and Scheidemann, Claus and Bornmann,
Peter and Littmann, Walter and Sextro, Walter}, year={2025} }'
chicago: Hemsel, Tobias, Claus Scheidemann, Peter Bornmann, Walter Littmann, and
Walter Sextro. “Intensive Ultrasonic Cleaning of Surfaces by Means of Lead-Free
Ultrasonic Transducer with Focussing Sonotrode,” 2025.
ieee: T. Hemsel, C. Scheidemann, P. Bornmann, W. Littmann, and W. Sextro, “Intensive
ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with
focussing sonotrode,” presented at the International Congress on Ultrasonics (ICU),
Paderborn, Germany, 2025.
mla: Hemsel, Tobias, et al. Intensive Ultrasonic Cleaning of Surfaces by Means
of Lead-Free Ultrasonic Transducer with Focussing Sonotrode. 2025.
short: 'T. Hemsel, C. Scheidemann, P. Bornmann, W. Littmann, W. Sextro, in: 2025.'
conference:
end_date: 2025-09-25
location: Paderborn, Germany
name: International Congress on Ultrasonics (ICU)
start_date: 2025-09-21
date_created: 2026-03-02T10:47:48Z
date_updated: 2026-03-02T10:58:37Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: open_access
content_type: application/pdf
creator: hemsel
date_created: 2026-03-02T10:46:43Z
date_updated: 2026-03-02T10:58:37Z
file_id: '64801'
file_name: ICU_2025_Hemsel.pdf
file_size: 1946202
relation: main_file
file_date_updated: 2026-03-02T10:58:37Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
status: public
title: Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic
transducer with focussing sonotrode
type: conference
user_id: '210'
year: '2025'
...
---
_id: '61755'
author:
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Scheidemann C, Hemsel T, Sextro W. Time dependent material characteristics
of prestressed piezoelectric ceramics in langevin transducers. In: ; 2025.'
apa: Scheidemann, C., Hemsel, T., & Sextro, W. (2025). Time dependent material
characteristics of prestressed piezoelectric ceramics in langevin transducers.
22nd International Workshop on Piezoelectric Materials and Applications in Actuators
(IWPMA), Vilnius, Lithuania.
bibtex: '@inproceedings{Scheidemann_Hemsel_Sextro_2025, title={Time dependent material
characteristics of prestressed piezoelectric ceramics in langevin transducers},
author={Scheidemann, Claus and Hemsel, Tobias and Sextro, Walter}, year={2025}
}'
chicago: Scheidemann, Claus, Tobias Hemsel, and Walter Sextro. “Time Dependent Material
Characteristics of Prestressed Piezoelectric Ceramics in Langevin Transducers,”
2025.
ieee: C. Scheidemann, T. Hemsel, and W. Sextro, “Time dependent material characteristics
of prestressed piezoelectric ceramics in langevin transducers,” presented at the
22nd International Workshop on Piezoelectric Materials and Applications in Actuators
(IWPMA), Vilnius, Lithuania, 2025.
mla: Scheidemann, Claus, et al. Time Dependent Material Characteristics of Prestressed
Piezoelectric Ceramics in Langevin Transducers. 2025.
short: 'C. Scheidemann, T. Hemsel, W. Sextro, in: 2025.'
conference:
end_date: 2025-07-3
location: Vilnius, Lithuania
name: 22nd International Workshop on Piezoelectric Materials and Applications in
Actuators (IWPMA)
start_date: 2025-07-1
date_created: 2025-10-08T14:22:32Z
date_updated: 2026-03-02T10:59:53Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: open_access
content_type: application/pdf
creator: hemsel
date_created: 2026-01-30T11:07:48Z
date_updated: 2026-03-02T10:59:53Z
file_id: '63817'
file_name: SHS25_IWPMA_2025.pdf
file_size: 644147
relation: main_file
file_date_updated: 2026-03-02T10:59:53Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
project:
- _id: '245'
name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
für Leistungsschallanwendungen (NEPTUN)'
status: public
title: Time dependent material characteristics of prestressed piezoelectric ceramics
in langevin transducers
type: conference
user_id: '210'
year: '2025'
...
---
_id: '61757'
author:
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Julius
full_name: Porzenheim, Julius
last_name: Porzenheim
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Scheidemann C, Porzenheim J, Hemsel T, Sextro W. Investigation of the Setting
Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers. In: ; 2025.'
apa: Scheidemann, C., Porzenheim, J., Hemsel, T., & Sextro, W. (2025). Investigation
of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers.
2025 International Congress on Ultrasonics (ICU), Paderborn, Germany.
bibtex: '@inproceedings{Scheidemann_Porzenheim_Hemsel_Sextro_2025, title={Investigation
of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers},
author={Scheidemann, Claus and Porzenheim, Julius and Hemsel, Tobias and Sextro,
Walter}, year={2025} }'
chicago: Scheidemann, Claus, Julius Porzenheim, Tobias Hemsel, and Walter Sextro.
“Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic
Transducers,” 2025.
ieee: C. Scheidemann, J. Porzenheim, T. Hemsel, and W. Sextro, “Investigation of
the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers,”
presented at the 2025 International Congress on Ultrasonics (ICU), Paderborn,
Germany, 2025.
mla: Scheidemann, Claus, et al. Investigation of the Setting Behaviour of Mechanically
Biased Piezoelectric Ultrasonic Transducers. 2025.
short: 'C. Scheidemann, J. Porzenheim, T. Hemsel, W. Sextro, in: 2025.'
conference:
end_date: 2025-09-25
location: Paderborn, Germany
name: 2025 International Congress on Ultrasonics (ICU)
start_date: 2025-09-21
date_created: 2025-10-08T14:33:44Z
date_updated: 2026-03-02T10:59:36Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: open_access
content_type: application/pdf
creator: hemsel
date_created: 2026-01-30T07:30:44Z
date_updated: 2026-03-02T10:59:36Z
file_id: '63816'
file_name: Sch25_ICU_2025.pdf
file_size: 783790
relation: main_file
file_date_updated: 2026-03-02T10:59:36Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
project:
- _id: '245'
name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
für Leistungsschallanwendungen (NEPTUN)'
status: public
title: Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric
Ultrasonic Transducers
type: conference
user_id: '210'
year: '2025'
...
---
_id: '62988'
author:
- first_name: Augustina C.
full_name: Amakor, Augustina C.
last_name: Amakor
- first_name: Manuel B.
full_name: Berkemeier, Manuel B.
last_name: Berkemeier
- first_name: Meike Claudia
full_name: Wohlleben, Meike Claudia
id: '43991'
last_name: Wohlleben
orcid: 0009-0009-9767-7168
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Sebastian
full_name: Peitz, Sebastian
last_name: Peitz
citation:
ama: 'Amakor AC, Berkemeier MB, Wohlleben MC, Sextro W, Peitz S. Surrogate-Assisted
Multi-objective Design of Complex Multibody Systems. In: Lecture Notes in Computer
Science. Springer Nature Switzerland; 2025. doi:10.1007/978-3-032-04555-3_21'
apa: Amakor, A. C., Berkemeier, M. B., Wohlleben, M. C., Sextro, W., & Peitz,
S. (2025). Surrogate-Assisted Multi-objective Design of Complex Multibody Systems.
In Lecture Notes in Computer Science. Springer Nature Switzerland. https://doi.org/10.1007/978-3-032-04555-3_21
bibtex: '@inbook{Amakor_Berkemeier_Wohlleben_Sextro_Peitz_2025, place={Cham}, title={Surrogate-Assisted
Multi-objective Design of Complex Multibody Systems}, DOI={10.1007/978-3-032-04555-3_21},
booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland},
author={Amakor, Augustina C. and Berkemeier, Manuel B. and Wohlleben, Meike Claudia
and Sextro, Walter and Peitz, Sebastian}, year={2025} }'
chicago: 'Amakor, Augustina C., Manuel B. Berkemeier, Meike Claudia Wohlleben, Walter
Sextro, and Sebastian Peitz. “Surrogate-Assisted Multi-Objective Design of Complex
Multibody Systems.” In Lecture Notes in Computer Science. Cham: Springer
Nature Switzerland, 2025. https://doi.org/10.1007/978-3-032-04555-3_21.'
ieee: 'A. C. Amakor, M. B. Berkemeier, M. C. Wohlleben, W. Sextro, and S. Peitz,
“Surrogate-Assisted Multi-objective Design of Complex Multibody Systems,” in Lecture
Notes in Computer Science, Cham: Springer Nature Switzerland, 2025.'
mla: Amakor, Augustina C., et al. “Surrogate-Assisted Multi-Objective Design of Complex
Multibody Systems.” Lecture Notes in Computer Science, Springer Nature
Switzerland, 2025, doi:10.1007/978-3-032-04555-3_21.
short: 'A.C. Amakor, M.B. Berkemeier, M.C. Wohlleben, W. Sextro, S. Peitz, in: Lecture
Notes in Computer Science, Springer Nature Switzerland, Cham, 2025.'
date_created: 2025-12-09T12:46:17Z
date_updated: 2026-03-03T06:32:10Z
department:
- _id: '151'
doi: 10.1007/978-3-032-04555-3_21
language:
- iso: eng
place: Cham
publication: Lecture Notes in Computer Science
publication_identifier:
isbn:
- '9783032045546'
- '9783032045553'
issn:
- 0302-9743
- 1611-3349
publication_status: published
publisher: Springer Nature Switzerland
quality_controlled: '1'
status: public
title: Surrogate-Assisted Multi-objective Design of Complex Multibody Systems
type: book_chapter
user_id: '43991'
year: '2025'
...
---
_id: '64804'
abstract:
- lang: ger
text: "Das Ultraschallschweißen ist in der Verpackungs-, Halbleiter- und Automobilindustrie
weit verbreitet. Neben dem Schweißen von Blechen bietet es die Möglichkeit, Folien
oder Hülsen zu verschweißen. Konventionelle Schweißsysteme arbeiten mit Längs-
oder Biegeschwingungen, deren Hauptanteil in der Schweißebene liegt. Der orthogonale
Anteil verursacht zusätzliche Belastungen im Schweißgut. Bei der Verwendung von
Torsionsschwingungen wird die orthogonale Komponente der Schwingung nahezu eliminiert.
\r\nIn diesem Beitrag wird ein System vorgestellt, bei dem die Torsionsschwingung
durch tangentiale Polarisation der Piezokeramiken erzeugt wird. Der Transducer
ist axial oberhalb des Schweißpunktes platziert, sodass die Normalkraft momentfrei
aufgebracht wird. Das Schweißwerkzeug weicht beim Schweißvorgang daher seitlich
nicht aus. Zudem wird das Schweißen an schwer zugänglichen Positionen vereinfacht,
da der Systemaufbau deutlich schlanker ist als konventionelle Ultraschallschweißsysteme.\r\nDie
Auslegung des Torsionsschwingsystems stellt eine Herausforderung dar. Insbesondere
muss die Lagerung des Schwingers betrachtet werden, da diese die Normalkraft übertragen
und zugleich die Schwingung nicht beeinträchtigen soll. Der Schweißprozess bewirkt
eine Verschiebung von Schwingungsknoten und Resonanzfrequenzen. Im Rahmen des
Vortrags wird ein Finite-Elemente-Simulationsmodell vorgestellt, das in Kombination
mit einem Lastmodell das Systemverhalten während des Schweißprozesses abbildet.
Die Geometrie des Transducers wurde schrittweise so angepasst, dass die Schwingamplitude
im Lagerungspunkt minimiert wird. \r\n"
author:
- first_name: Markus Daniel
full_name: Dohmen, Markus Daniel
id: '69217'
last_name: Dohmen
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Dohmen MD, Bornmann P, Littmann W, Hemsel T, Sextro W. Modellgestützte Optimierung
eines Ultraschall-Torsionsschweißsystems. In: ; 2025.'
apa: Dohmen, M. D., Bornmann, P., Littmann, W., Hemsel, T., & Sextro, W. (2025).
Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems.
bibtex: '@inproceedings{Dohmen_Bornmann_Littmann_Hemsel_Sextro_2025, title={Modellgestützte
Optimierung eines Ultraschall-Torsionsschweißsystems}, author={Dohmen, Markus
Daniel and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias and Sextro,
Walter}, year={2025} }'
chicago: Dohmen, Markus Daniel, Peter Bornmann, Walter Littmann, Tobias Hemsel,
and Walter Sextro. “Modellgestützte Optimierung Eines Ultraschall-Torsionsschweißsystems,”
2025.
ieee: M. D. Dohmen, P. Bornmann, W. Littmann, T. Hemsel, and W. Sextro, “Modellgestützte
Optimierung eines Ultraschall-Torsionsschweißsystems,” 2025.
mla: Dohmen, Markus Daniel, et al. Modellgestützte Optimierung Eines Ultraschall-Torsionsschweißsystems.
2025.
short: 'M.D. Dohmen, P. Bornmann, W. Littmann, T. Hemsel, W. Sextro, in: 2025.'
date_created: 2026-03-02T12:02:08Z
date_updated: 2026-03-03T13:57:25Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: closed
content_type: application/pdf
creator: hemsel
date_created: 2026-03-02T12:01:28Z
date_updated: 2026-03-02T12:01:28Z
file_id: '64805'
file_name: Dohmen_UPB_LDM_IMAPS_2025.pdf
file_size: 1912154
relation: main_file
success: 1
file_date_updated: 2026-03-02T12:01:28Z
has_accepted_license: '1'
language:
- iso: eng
status: public
title: Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems
type: conference
user_id: '210'
year: '2025'
...
---
_id: '58556'
abstract:
- lang: eng
text: 'To predict and prevent uneven tire wear in addition to a reduction of overall
tire wear, it is essential to estimate not only the total amount of wear but also
how the wear is distributed across the tire width. This requires knowledge of
the frictional power distribution in the tire contact patch, which is the basis
for calculating tire wear using a wear law. Usually, only 3D structural tire models
can generate such distributed contact results. However, they involve high computational
costs and cannot be used for comprehensive optimization of a vehicle’s suspension
system with respect to tire wear characteristics. Hence, this contribution presents
a methodology on how to accelerate the prediction of the frictional power distribution
using two components: The structural tire model is replaced by an empirical tire
model that on its own is not able to generate distributed contact results. Therefore,
an artificial neural network is trained to predict the desired contact results
from the kinematic quantities calculated by the empirical tire model. In the initial
training phase, both components are fitted to data generated by the original complex
tire model. After training, the empirical tire model can replace the structural
tire model in vehicle simulations, resulting in significantly shorter calculation
times. The simulation results are fed into the artificial neural network, which
predicts the frictional power distributions over the tire width with negligible
additional effort. Overall, the methodology reduces calculation time for the prediction
of tire wear based on virtual test drives to approximately 25% of the time needed
when using structural tire models.'
article_type: original
author:
- first_name: Lars
full_name: Muth, Lars
id: '77313'
last_name: Muth
orcid: 0000-0002-2938-5616
- first_name: Raphael
full_name: Zharia, Raphael
last_name: Zharia
- first_name: Hürkan
full_name: Sahin, Hürkan
last_name: Sahin
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Muth L, Zharia R, Sahin H, Sextro W. Prediction of the Frictional Power Distribution
in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural
Network. Tire Science and Technology. Published online 2025. doi:https://doi.org/10.2346/TST-24-009
apa: Muth, L., Zharia, R., Sahin, H., & Sextro, W. (2025). Prediction of the
Frictional Power Distribution in the Tire Contact Patch Based on an Empirical
Tire Model and an Artificial Neural Network. Tire Science and Technology.
https://doi.org/10.2346/TST-24-009
bibtex: '@article{Muth_Zharia_Sahin_Sextro_2025, title={Prediction of the Frictional
Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model
and an Artificial Neural Network}, DOI={https://doi.org/10.2346/TST-24-009},
journal={Tire Science and Technology}, publisher={The Tire Society}, author={Muth,
Lars and Zharia, Raphael and Sahin, Hürkan and Sextro, Walter}, year={2025} }'
chicago: Muth, Lars, Raphael Zharia, Hürkan Sahin, and Walter Sextro. “Prediction
of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical
Tire Model and an Artificial Neural Network.” Tire Science and Technology,
2025. https://doi.org/10.2346/TST-24-009.
ieee: 'L. Muth, R. Zharia, H. Sahin, and W. Sextro, “Prediction of the Frictional
Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model
and an Artificial Neural Network,” Tire Science and Technology, 2025, doi:
https://doi.org/10.2346/TST-24-009.'
mla: Muth, Lars, et al. “Prediction of the Frictional Power Distribution in the
Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network.”
Tire Science and Technology, The Tire Society, 2025, doi:https://doi.org/10.2346/TST-24-009.
short: L. Muth, R. Zharia, H. Sahin, W. Sextro, Tire Science and Technology (2025).
date_created: 2025-02-10T19:54:28Z
date_updated: 2025-02-27T19:53:09Z
department:
- _id: '151'
- _id: '9'
doi: https://doi.org/10.2346/TST-24-009
extern: '1'
language:
- iso: eng
publication: Tire Science and Technology
publication_status: epub_ahead
publisher: The Tire Society
quality_controlled: '1'
status: public
title: Prediction of the Frictional Power Distribution in the Tire Contact Patch Based
on an Empirical Tire Model and an Artificial Neural Network
type: journal_article
user_id: '77313'
year: '2025'
...
---
_id: '63193'
abstract:
- lang: eng
text: The integration of data-driven models and specifically machine learning for
conditon monitoring and predictive maintenance into companies, especially small
and medium-sized enterprises, offers significant opportunities in reducing costs,
operating more sustainably, and maintaining long-term competitiveness. However,
many small and medium-sized enterprises lack the necessary resources and expertise
to derive knowledge from data and integrate their own machine learning based solutions.
To address this challenge, a framework is presented that enables the automated
generation of data-driven models with a particular focus on condition monitoring
and predictive maintenance, but applicable to other use cases as well. Using a
dataset from the 2022 data challenge of the prognostics and health management
society, it is demonstrated that the framework can generate high-performing models,
achieving F1-scores up to 0.998, exemplarily for a classification task.
author:
- first_name: Alexander
full_name: Löwen, Alexander
id: '47233'
last_name: Löwen
- first_name: Dennis
full_name: Quirin, Dennis
last_name: Quirin
- first_name: Marc
full_name: Hesse, Marc
last_name: Hesse
- first_name: Osarenren Kennedy
full_name: Aimiyekagbon, Osarenren Kennedy
id: '9557'
last_name: Aimiyekagbon
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Löwen A, Quirin D, Hesse M, Aimiyekagbon OK, Sextro W. Facilitating the Automated
Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical
Systems. In: 2025 IEEE 30th International Conference on Emerging Technologies
and Factory Automation (ETFA). IEEE; 2025. doi:10.1109/etfa65518.2025.11205799'
apa: Löwen, A., Quirin, D., Hesse, M., Aimiyekagbon, O. K., & Sextro, W. (2025).
Facilitating the Automated Generation of Data-Driven Models for the Diagnostics
and Prognostics of Technical Systems. 2025 IEEE 30th International Conference
on Emerging Technologies and Factory Automation (ETFA). 2025 IEEE 30th International
Conference on Emerging Technologies and Factory Automation (ETFA), Porto. https://doi.org/10.1109/etfa65518.2025.11205799
bibtex: '@inproceedings{Löwen_Quirin_Hesse_Aimiyekagbon_Sextro_2025, title={Facilitating
the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics
of Technical Systems}, DOI={10.1109/etfa65518.2025.11205799},
booktitle={2025 IEEE 30th International Conference on Emerging Technologies and
Factory Automation (ETFA)}, publisher={IEEE}, author={Löwen, Alexander and Quirin,
Dennis and Hesse, Marc and Aimiyekagbon, Osarenren Kennedy and Sextro, Walter},
year={2025} }'
chicago: Löwen, Alexander, Dennis Quirin, Marc Hesse, Osarenren Kennedy Aimiyekagbon,
and Walter Sextro. “Facilitating the Automated Generation of Data-Driven Models
for the Diagnostics and Prognostics of Technical Systems.” In 2025 IEEE 30th
International Conference on Emerging Technologies and Factory Automation (ETFA).
IEEE, 2025. https://doi.org/10.1109/etfa65518.2025.11205799.
ieee: 'A. Löwen, D. Quirin, M. Hesse, O. K. Aimiyekagbon, and W. Sextro, “Facilitating
the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics
of Technical Systems,” presented at the 2025 IEEE 30th International Conference
on Emerging Technologies and Factory Automation (ETFA), Porto, 2025, doi: 10.1109/etfa65518.2025.11205799.'
mla: Löwen, Alexander, et al. “Facilitating the Automated Generation of Data-Driven
Models for the Diagnostics and Prognostics of Technical Systems.” 2025 IEEE
30th International Conference on Emerging Technologies and Factory Automation
(ETFA), IEEE, 2025, doi:10.1109/etfa65518.2025.11205799.
short: 'A. Löwen, D. Quirin, M. Hesse, O.K. Aimiyekagbon, W. Sextro, in: 2025 IEEE
30th International Conference on Emerging Technologies and Factory Automation
(ETFA), IEEE, 2025.'
conference:
location: Porto
name: 2025 IEEE 30th International Conference on Emerging Technologies and Factory
Automation (ETFA)
date_created: 2025-12-18T09:07:38Z
date_updated: 2025-12-18T09:12:48Z
department:
- _id: '151'
doi: 10.1109/etfa65518.2025.11205799
language:
- iso: eng
project:
- _id: '1483'
name: Industrie 4.0 Ökosystem für den automatisierten Einsatz von datengetriebenen
Services (I4.0AutoServ)
publication: 2025 IEEE 30th International Conference on Emerging Technologies and
Factory Automation (ETFA)
publication_status: published
publisher: IEEE
related_material:
link:
- relation: confirmation
url: https://ieeexplore.ieee.org/document/11205799
status: public
title: Facilitating the Automated Generation of Data-Driven Models for the Diagnostics
and Prognostics of Technical Systems
type: conference
user_id: '47233'
year: '2025'
...
---
_id: '62299'
author:
- first_name: Olga
full_name: Friesen, Olga
id: '44026'
last_name: Friesen
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Leander
full_name: Claes, Leander
id: '11829'
last_name: Claes
orcid: 0000-0002-4393-268X
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Bernd
full_name: Henning, Bernd
id: '213'
last_name: Henning
citation:
ama: 'Friesen O, Scheidemann C, Claes L, Hemsel T, Henning B. Sensitivity Analysis
and Material Parameter Estimation of a Pre-Stressed Langevin Transducer. In: 2025
International Congress on Ultrasonics. AMA Service GmbH; 2025:138–141. doi:10.5162/ultrasonic2025/a18-a4'
apa: Friesen, O., Scheidemann, C., Claes, L., Hemsel, T., & Henning, B. (2025).
Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin
Transducer. 2025 International Congress on Ultrasonics, 138–141. https://doi.org/10.5162/ultrasonic2025/a18-a4
bibtex: '@inproceedings{Friesen_Scheidemann_Claes_Hemsel_Henning_2025, place={Paderborn},
title={Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed
Langevin Transducer}, DOI={10.5162/ultrasonic2025/a18-a4},
booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service
GmbH}, author={Friesen, Olga and Scheidemann, Claus and Claes, Leander and Hemsel,
Tobias and Henning, Bernd}, year={2025}, pages={138–141} }'
chicago: 'Friesen, Olga, Claus Scheidemann, Leander Claes, Tobias Hemsel, and Bernd
Henning. “Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed
Langevin Transducer.” In 2025 International Congress on Ultrasonics, 138–141.
Paderborn: AMA Service GmbH, 2025. https://doi.org/10.5162/ultrasonic2025/a18-a4.'
ieee: 'O. Friesen, C. Scheidemann, L. Claes, T. Hemsel, and B. Henning, “Sensitivity
Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer,”
in 2025 International Congress on Ultrasonics, 2025, pp. 138–141, doi:
10.5162/ultrasonic2025/a18-a4.'
mla: Friesen, Olga, et al. “Sensitivity Analysis and Material Parameter Estimation
of a Pre-Stressed Langevin Transducer.” 2025 International Congress on Ultrasonics,
AMA Service GmbH, 2025, pp. 138–141, doi:10.5162/ultrasonic2025/a18-a4.
short: 'O. Friesen, C. Scheidemann, L. Claes, T. Hemsel, B. Henning, in: 2025 International
Congress on Ultrasonics, AMA Service GmbH, Paderborn, 2025, pp. 138–141.'
date_created: 2025-11-25T12:23:06Z
date_updated: 2026-01-05T08:00:48Z
department:
- _id: '49'
- _id: '151'
doi: 10.5162/ultrasonic2025/a18-a4
language:
- iso: eng
page: 138–141
place: Paderborn
project:
- _id: '245'
name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
für Leistungsschallanwendungen (NEPTUN)'
publication: 2025 International Congress on Ultrasonics
publisher: AMA Service GmbH
status: public
title: Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin
Transducer
type: conference
user_id: '11829'
year: '2025'
...
---
_id: '64894'
abstract:
- lang: eng
text: "This dataset contains experimental measurements of the radial dynamic and
quasi-static characteristics of four different types of Rubber-Metal Bushings
(RMBs) used in the suspension system of a passenger car under harmonic displacement
excitation. For each bushing type, 2–3 individual specimens were tested.\r\n \r\nQuasi-static
measurements were performed at a constant excitation frequency of 0.05 Hz with
varying displacement amplitudes. Dynamic measurements were conducted with displacement
amplitudes ranging from 0.04 mm to 0.3 mm and excitation frequencies of 2, 5,
10, ..., up to 100 Hz.\r\n\r\nThe data is structured by bushing type, measurement
mode, amplitude, and frequency, and is provided in *.csv and *.hrm format. It
is intended to support further research in modeling rubber-metal bushings and
parameter identification techniques."
author:
- first_name: Jan
full_name: Schütte, Jan
id: '22109'
last_name: Schütte
orcid: 0000-0001-9025-9742
citation:
ama: 'Schütte J. Experimental Dataset: Force and Displacement Measurements of
Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement
Excitation. LibreCat University; 2025. doi:10.5281/ZENODO.14851317'
apa: 'Schütte, J. (2025). Experimental Dataset: Force and Displacement Measurements
of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement
Excitation. LibreCat University. https://doi.org/10.5281/ZENODO.14851317'
bibtex: '@book{Schütte_2025, title={Experimental Dataset: Force and Displacement
Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic
Displacement Excitation}, DOI={10.5281/ZENODO.14851317},
publisher={LibreCat University}, author={Schütte, Jan}, year={2025} }'
chicago: 'Schütte, Jan. Experimental Dataset: Force and Displacement Measurements
of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement
Excitation. LibreCat University, 2025. https://doi.org/10.5281/ZENODO.14851317.'
ieee: 'J. Schütte, Experimental Dataset: Force and Displacement Measurements
of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement
Excitation. LibreCat University, 2025.'
mla: 'Schütte, Jan. Experimental Dataset: Force and Displacement Measurements
of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement
Excitation. LibreCat University, 2025, doi:10.5281/ZENODO.14851317.'
short: 'J. Schütte, Experimental Dataset: Force and Displacement Measurements of
Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement
Excitation, LibreCat University, 2025.'
date_created: 2026-03-11T10:22:01Z
date_updated: 2026-03-11T10:25:23Z
department:
- _id: '151'
doi: 10.5281/ZENODO.14851317
keyword:
- bushing
- experimental data
- rubber-metal-bushing
- Dataset suspension
publisher: LibreCat University
status: public
title: 'Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal
Bushing Types from a Passenger Car under Harmonic Displacement Excitation'
type: research_data
user_id: '22109'
year: '2025'
...
---
_id: '64803'
abstract:
- lang: eng
text: "Nowadays ultrasound technology is established in various fields of application
like industrial production or medical technology. Besides high power ultrasound
applications like ultrasonic cleaning and ultrasonic welding, which are often
not strongly restricted regarding their weight, costs, and construction space,
there are many applications in the low to medium power range like handheld surgical
instruments, medical inhalers, or ultrasonic cutters. For the latter there is
often a strong demand for low weight and construction space and low costs to be
competitive in mass production. Another challenge that arises from the RoHS-directive
[1] is, that new ultrasonic devices should avoid the use of lead-containing PZT-materials.
Against this background there is a demand for lead-free, small and lightweight
and cost-effective ultrasonic transducers.\r\nIn many of the above-mentioned applications,
pre-stressed Bolted-Langevine-Transducers (BLT) based on lead-containing PZT-materials
are established to generate ultrasonic vibrations. These are quite advantageous
in many ways and can be built tailored to each application and even for high power
of thousands of watts. But due to the required steps during their manufacturing
process (machining parts, assembly, pre-stressing, frequency tuning, …), these
transducers remain expensive. Furthermore, due to the operation in resonance,
the construction space of these transducers is linked to their wavelength and
cannot be reduced remarkably.\r\nFor these reasons, our aim is to present an innovative
lead-free ultrasonic transducer for low to medium power applications, that is
based on bending vibrations instead of longitudinal vibrations. This design enables
to build very small transducers. Furthermore, due to their simple construction,
these transducers can be built at low manufacturing costs and are well suited
for industrial mass production. The use of lead-free piezoelectric materials makes
this transducer design ready for future applications.\r\nIn our contribution we
will present the model-based design of a lead-free 30 kHz bending transducer for
applications up to 10 W. Furthermore, the comprehensive experimental analysis
of this transducer-prototype in applications like mist generation or ultrasonic
drilling will be presented. The results will be compared to a PZT-based bending
transducer and a classical BLT to show the potential and limits of these kind
of transducers and lead-free materials.\r\n"
author:
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: 'Bornmann P, Littmann W, Scheidemann C, Hemsel T. Innovative lead-free ultrasonic
bending transducers for low to medium power applications. In: ; 2025.'
apa: Bornmann, P., Littmann, W., Scheidemann, C., & Hemsel, T. (2025). Innovative
lead-free ultrasonic bending transducers for low to medium power applications.
International Congress on Ultrasonics (ICU), Paderborn, Germany.
bibtex: '@inproceedings{Bornmann_Littmann_Scheidemann_Hemsel_2025, title={Innovative
lead-free ultrasonic bending transducers for low to medium power applications},
author={Bornmann, Peter and Littmann, Walter and Scheidemann, Claus and Hemsel,
Tobias}, year={2025} }'
chicago: Bornmann, Peter, Walter Littmann, Claus Scheidemann, and Tobias Hemsel.
“Innovative Lead-Free Ultrasonic Bending Transducers for Low to Medium Power Applications,”
2025.
ieee: P. Bornmann, W. Littmann, C. Scheidemann, and T. Hemsel, “Innovative lead-free
ultrasonic bending transducers for low to medium power applications,” presented
at the International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025.
mla: Bornmann, Peter, et al. Innovative Lead-Free Ultrasonic Bending Transducers
for Low to Medium Power Applications. 2025.
short: 'P. Bornmann, W. Littmann, C. Scheidemann, T. Hemsel, in: 2025.'
conference:
end_date: 2025-09-25
location: Paderborn, Germany
name: International Congress on Ultrasonics (ICU)
start_date: 2025-09-21
date_created: 2026-03-02T11:35:33Z
date_updated: 2026-04-02T12:47:18Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: closed
content_type: application/pdf
creator: hemsel
date_created: 2026-04-02T12:46:09Z
date_updated: 2026-04-02T12:46:09Z
file_id: '65354'
file_name: ICU_2025_Bornmann.pdf
file_size: 1878995
relation: main_file
success: 1
file_date_updated: 2026-04-02T12:46:09Z
has_accepted_license: '1'
language:
- iso: eng
status: public
title: Innovative lead-free ultrasonic bending transducers for low to medium power
applications
type: conference
user_id: '210'
year: '2025'
...
---
_id: '64802'
abstract:
- lang: eng
text: Power ultrasonic actuators are used in various industrial, automotive and
medical applications. Examples are ultrasonic welding of plastics or metal, surgery
processes like cutting of tissue or bone, and the excitation of cavitation in
liquids for ultrasonic cleaning. From a physical point of view, many of these
processes are characterised by non-constant damping conditions for the ultrasonic
actuators, since the systems need to be driven in unloaded as well as in high-loaded
states. To get high power output, the piezoelectric actuators are usually driven
in or near resonance at precisely defined vibration amplitudes. This is a quite
complicated task especially if cost or mass optimized PZT transducers are used
or if lead-free piezoelectric ceramics are applied to replace lead-containing
materials. In particular the sudden change between loading states is very challenging
for electronic excitation and control. The present contribution gives insight
into typical problems that may arise in context with sudden load-changes during
operation, e.g. uncontrolled jumps in voltage and velocity amplitudes. Measurements
on ultrasonic power actuators being abruptly immersed into water at high amplitude
are discussed for illustration. Observations during spontaneous load-changes are
explained, and it is shown that several problems may be defused by driving the
actuators in antiresonance or using a particular driving point in-between resonance
and antiresonance (“falling edge control”). The different control strategies are
investigated always using just one single hardware.
author:
- first_name: Walter
full_name: Littmann, Walter
last_name: Littmann
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
citation:
ama: 'Littmann W, Bornmann P, Hemsel T, Scheidemann C. Power ultrasonic actuators
with suddenly changing loads: How to control the amplitudes in resonance, antiresonance,
or in-between. In: ; 2025.'
apa: 'Littmann, W., Bornmann, P., Hemsel, T., & Scheidemann, C. (2025). Power
ultrasonic actuators with suddenly changing loads: How to control the amplitudes
in resonance, antiresonance, or in-between. International Conference on Ultrasonics
(ICU), Paderborn, Germany.'
bibtex: '@inproceedings{Littmann_Bornmann_Hemsel_Scheidemann_2025, title={Power
ultrasonic actuators with suddenly changing loads: How to control the amplitudes
in resonance, antiresonance, or in-between}, author={Littmann, Walter and Bornmann,
Peter and Hemsel, Tobias and Scheidemann, Claus}, year={2025} }'
chicago: 'Littmann, Walter, Peter Bornmann, Tobias Hemsel, and Claus Scheidemann.
“Power Ultrasonic Actuators with Suddenly Changing Loads: How to Control the Amplitudes
in Resonance, Antiresonance, or in-Between,” 2025.'
ieee: 'W. Littmann, P. Bornmann, T. Hemsel, and C. Scheidemann, “Power ultrasonic
actuators with suddenly changing loads: How to control the amplitudes in resonance,
antiresonance, or in-between,” presented at the International Conference on Ultrasonics
(ICU), Paderborn, Germany, 2025.'
mla: 'Littmann, Walter, et al. Power Ultrasonic Actuators with Suddenly Changing
Loads: How to Control the Amplitudes in Resonance, Antiresonance, or in-Between.
2025.'
short: 'W. Littmann, P. Bornmann, T. Hemsel, C. Scheidemann, in: 2025.'
conference:
end_date: 2025-09-25
location: Paderborn, Germany
name: International Conference on Ultrasonics (ICU)
start_date: 2025-09-21
date_created: 2026-03-02T11:19:46Z
date_updated: 2026-04-02T12:45:42Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: closed
content_type: application/pdf
creator: hemsel
date_created: 2026-04-02T12:41:08Z
date_updated: 2026-04-02T12:41:08Z
file_id: '65353'
file_name: ICU_2025_Littmann.pdf
file_size: 2522135
relation: main_file
success: 1
file_date_updated: 2026-04-02T12:41:08Z
has_accepted_license: '1'
language:
- iso: eng
status: public
title: 'Power ultrasonic actuators with suddenly changing loads: How to control the
amplitudes in resonance, antiresonance, or in-between'
type: conference
user_id: '210'
year: '2025'
...
---
_id: '51518'
abstract:
- lang: eng
text: In applications of piezoelectric actuators and sensors, the dependability
and particularly the reliability throughout their lifetime are vital to manufacturers
and end-users and are enabled through condition-monitoring approaches. Existing
approaches often utilize impedance measurements over a range of frequencies or
velocity measurements and require additional equipment or sensors, such as a laser
Doppler vibrometer. Furthermore, the non-negligible effects of varying operating
conditions are often unconsidered. To minimize the need for additional sensors
while maintaining the dependability of piezoelectric bending actuators irrespective
of varying operating conditions, an online diagnostics approach is proposed. To
this end, time- and frequency-domain features are extracted from monitored current
signals to reflect hairline crack development in bending actuators. For validation
of applicability, the presented analysis method was evaluated on piezoelectric
bending actuators subjected to accelerated lifetime tests at varying voltage amplitudes
and under external damping conditions. In the presence of a crack and due to a
diminished stiffness, the resonance frequency decreases and the root-mean-square
amplitude of the current signal simultaneously abruptly drops during the lifetime
tests. Furthermore, the piezoelectric crack surfaces clapping is reflected in
higher harmonics of the current signal. Thus, time-domain features and harmonics
of the current signals are sufficient to diagnose hairline cracks in the actuators.
article_number: '521'
article_type: original
author:
- first_name: Osarenren Kennedy
full_name: Aimiyekagbon, Osarenren Kennedy
id: '9557'
last_name: Aimiyekagbon
- first_name: Amelie
full_name: Bender, Amelie
id: '54290'
last_name: Bender
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Aimiyekagbon OK, Bender A, Hemsel T, Sextro W. Diagnostics of Piezoelectric
Bending Actuators Subjected to Varying Operating Conditions. Electronics.
2024;13(3). doi:10.3390/electronics13030521
apa: Aimiyekagbon, O. K., Bender, A., Hemsel, T., & Sextro, W. (2024). Diagnostics
of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions.
Electronics, 13(3), Article 521. https://doi.org/10.3390/electronics13030521
bibtex: '@article{Aimiyekagbon_Bender_Hemsel_Sextro_2024, title={Diagnostics of
Piezoelectric Bending Actuators Subjected to Varying Operating Conditions}, volume={13},
DOI={10.3390/electronics13030521},
number={3521}, journal={Electronics}, publisher={MDPI AG}, author={Aimiyekagbon,
Osarenren Kennedy and Bender, Amelie and Hemsel, Tobias and Sextro, Walter}, year={2024}
}'
chicago: Aimiyekagbon, Osarenren Kennedy, Amelie Bender, Tobias Hemsel, and Walter
Sextro. “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating
Conditions.” Electronics 13, no. 3 (2024). https://doi.org/10.3390/electronics13030521.
ieee: 'O. K. Aimiyekagbon, A. Bender, T. Hemsel, and W. Sextro, “Diagnostics of
Piezoelectric Bending Actuators Subjected to Varying Operating Conditions,” Electronics,
vol. 13, no. 3, Art. no. 521, 2024, doi: 10.3390/electronics13030521.'
mla: Aimiyekagbon, Osarenren Kennedy, et al. “Diagnostics of Piezoelectric Bending
Actuators Subjected to Varying Operating Conditions.” Electronics, vol.
13, no. 3, 521, MDPI AG, 2024, doi:10.3390/electronics13030521.
short: O.K. Aimiyekagbon, A. Bender, T. Hemsel, W. Sextro, Electronics 13 (2024).
date_created: 2024-02-20T06:46:43Z
date_updated: 2024-03-15T16:15:56Z
department:
- _id: '151'
doi: 10.3390/electronics13030521
funded_apc: '1'
intvolume: ' 13'
issue: '3'
keyword:
- piezoelectric transducer
- self-sensing
- fault detection
- diagnostics
- hairline crack
- condition monitoring
language:
- iso: eng
publication: Electronics
publication_identifier:
issn:
- 2079-9292
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating
Conditions
type: journal_article
user_id: '9557'
volume: 13
year: '2024'
...
---
_id: '52611'
abstract:
- lang: ger
text: "Ultraschallsysteme für das Herstellen für Bond- und Schweißverbindungen in
der Halbleiterfertigung zeigen auf Grund des Betriebes unter hohen Anregungsniveaus
nichtlineare Materialeigenschaften. Dabei wirken unterschiedliche Einflussfaktoren
auf die elektrischen Eigenschaften und die mechanischen Übertragungscharakteristiken
der Ultraschallsysteme ein. Die Herausforderungen ein solches geprägtes System
auszulegen oder effizient und zuverlässig zu betreiben, sind aufgrund der Nichtlinearitäten
relativ groß.\r\nDa für die Beschreibung der nichtlinearen Materialbeziehungen
nur wenige Modelle und kaum quantitative Angaben vorliegen, werden die komplexen
Wechselwirkungen von Materialparametern, Geometrie und Vorspannung des Schwingers,
Betriebsgrößen (Strom, Spannung), Temperatur und Prozesslasten durch systematische
Untersuchungen von Keramiken und Langevin-Schwingern messtechnisch erfasst. Aus
den Messergebnissen werden einerseits eindimensionale Modelle für Voruntersuchungen
als auch vollständige Materialparametersätze für die Simulation mittels dreidimensionaler
FE-Modelle hergeleitet.\r\nEine Methodik zur Ermittlung der Materialparameter
und ein auf iterativen Simulationen von FE-Modellen basierendes Werkzeug zur Simulation
der komplexen Wechselwirkungen werden vorgestellt. Anhand eines exemplarischen
Ultraschallsystems wird gezeigt, dass die Wirkungen temperaturbedingter Vorspannungsverluste,
Änderungen des elektrischen Klemmenverhaltens und Amplituden- und Frequenzänderungen
während des Betriebes bei großen Amplituden und Prozesslasten durch die Variationen
des Keramikvolumens und der Keramikposition positiv beeinflusst werden können."
author:
- first_name: Collin
full_name: Dymel, Collin
last_name: Dymel
citation:
ama: Dymel C. Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung
von Nichtlinearitäten. Vol 16. Shaker Verlag; 2024.
apa: Dymel, C. (2024). Modellbasierte Entwicklung von Ultraschallwandlern unter
der Berücksichtigung von Nichtlinearitäten (Vol. 16). Shaker Verlag.
bibtex: '@book{Dymel_2024, place={Düren}, series={Schriften des Lehrstuhls für Dynamik
und Mechatronik}, title={Modellbasierte Entwicklung von Ultraschallwandlern unter
der Berücksichtigung von Nichtlinearitäten}, volume={16}, publisher={Shaker Verlag},
author={Dymel, Collin}, year={2024}, collection={Schriften des Lehrstuhls für
Dynamik und Mechatronik} }'
chicago: 'Dymel, Collin. Modellbasierte Entwicklung von Ultraschallwandlern unter
der Berücksichtigung von Nichtlinearitäten. Vol. 16. Schriften des Lehrstuhls
für Dynamik und Mechatronik. Düren: Shaker Verlag, 2024.'
ieee: 'C. Dymel, Modellbasierte Entwicklung von Ultraschallwandlern unter der
Berücksichtigung von Nichtlinearitäten, vol. 16. Düren: Shaker Verlag, 2024.'
mla: Dymel, Collin. Modellbasierte Entwicklung von Ultraschallwandlern unter
der Berücksichtigung von Nichtlinearitäten. Shaker Verlag, 2024.
short: C. Dymel, Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung
von Nichtlinearitäten, Shaker Verlag, Düren, 2024.
date_created: 2024-03-18T11:13:27Z
date_updated: 2024-03-18T11:32:27Z
department:
- _id: '151'
intvolume: ' 16'
jel:
- D3
keyword:
- Nichtlineares piezoelektrisches Verhalten
- Dehnungsabhängigkeit
- Vorspannungseinfluss
- Temperatureinfluss
- Lasteinfluss
- Langevin-Schwinger
- Ultraschallwandler
- Ultraschallbonden
- FEM-Modell
- Ultraschallschweißen
- BVD-Modell
language:
- iso: ger
page: '134'
place: Düren
publication_identifier:
isbn:
- '9783844093964'
publication_status: published
publisher: Shaker Verlag
related_material:
link:
- relation: confirmation
url: https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-9396-4&search=yes
series_title: Schriften des Lehrstuhls für Dynamik und Mechatronik
status: public
title: Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung
von Nichtlinearitäten
type: dissertation
user_id: '55222'
volume: 16
year: '2024'
...
---
_id: '55336'
abstract:
- lang: eng
text: "Predicting the remaining useful life of technical \r\nsystems has gained
significant attention in recent years due to \r\nincreasing demands for extending
the lifespan of degrading system \r\ncomponents. Therefore, already used systems
are retrofitted by \r\nintegrating sensors to monitor their performance and \r\nfunctionality,
enabling accurate diagnosis of their condition and \r\nprediction of their remaining
useful life. One of the main \r\nchallenges in this field is identified in the
missing data from the \r\ntime where the retrofitted system has already run but
without \r\nbeing monitored by sensors. In this paper, a novel approach for \r\nthe
combined diagnostics and prognostics of retrofitted systems is \r\nproposed. The
methodology aims to provide an accurate diagnosis \r\nof the system’s health state
and estimation of the remaining useful \r\nlife by a combination of a machine
learning and expert knowledge. \r\nTo evaluate the effectiveness of the proposed
methodology, a case \r\nstudy involving a retrofitted system in an industrial
setting is \r\nselected and applied. It is demonstrated that the approach \r\neffectively
diagnose the current system’s health state and \r\naccurately predict its remaining
useful life, thereby enabling \r\npredictive maintenance and decision-making.
Overall, our \r\nresearch contributes to advancing the field of condition \r\nmonitoring
for retrofitted systems by providing a comprehensive \r\nmethodology that addresses
the challenge of missing data."
author:
- first_name: Amelie
full_name: Bender, Amelie
id: '54290'
last_name: Bender
- first_name: Osarenren Kennedy
full_name: Aimiyekagbon, Osarenren Kennedy
id: '9557'
last_name: Aimiyekagbon
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Bender A, Aimiyekagbon OK, Sextro W. Diagnostics and Prognostics for Retrofitted
Systems: A Comprehensive Approach for Enhanced System Health Assessment. In: Proceedings
of the 2024 Prognostics and System Health Management Conference (PHM). IEEE
Computer Society; 2024. doi:10.1109/PHM61473.2024.00038'
apa: 'Bender, A., Aimiyekagbon, O. K., & Sextro, W. (2024). Diagnostics and
Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System
Health Assessment. Proceedings of the 2024 Prognostics and System Health Management
Conference (PHM). 2024 Prognostics and System Health Management Conference
(PHM), Stockholm, Schweden. https://doi.org/10.1109/PHM61473.2024.00038'
bibtex: '@inproceedings{Bender_Aimiyekagbon_Sextro_2024, title={Diagnostics and
Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System
Health Assessment}, DOI={10.1109/PHM61473.2024.00038},
booktitle={Proceedings of the 2024 Prognostics and System Health Management Conference
(PHM)}, publisher={IEEE Computer Society}, author={Bender, Amelie and Aimiyekagbon,
Osarenren Kennedy and Sextro, Walter}, year={2024} }'
chicago: 'Bender, Amelie, Osarenren Kennedy Aimiyekagbon, and Walter Sextro. “Diagnostics
and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced
System Health Assessment.” In Proceedings of the 2024 Prognostics and System
Health Management Conference (PHM). IEEE Computer Society, 2024. https://doi.org/10.1109/PHM61473.2024.00038.'
ieee: 'A. Bender, O. K. Aimiyekagbon, and W. Sextro, “Diagnostics and Prognostics
for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment,”
presented at the 2024 Prognostics and System Health Management Conference (PHM),
Stockholm, Schweden, 2024, doi: 10.1109/PHM61473.2024.00038.'
mla: 'Bender, Amelie, et al. “Diagnostics and Prognostics for Retrofitted Systems:
A Comprehensive Approach for Enhanced System Health Assessment.” Proceedings
of the 2024 Prognostics and System Health Management Conference (PHM), IEEE
Computer Society, 2024, doi:10.1109/PHM61473.2024.00038.'
short: 'A. Bender, O.K. Aimiyekagbon, W. Sextro, in: Proceedings of the 2024 Prognostics
and System Health Management Conference (PHM), IEEE Computer Society, 2024.'
conference:
end_date: 2024-05-31
location: Stockholm, Schweden
name: 2024 Prognostics and System Health Management Conference (PHM)
start_date: 2024-05-28
date_created: 2024-07-22T09:27:57Z
date_updated: 2024-07-22T09:29:26Z
department:
- _id: '151'
doi: 10.1109/PHM61473.2024.00038
keyword:
- retrofit
- diagnosis
- prognostics
- RUL prediction
- missing data
- ball bearings
language:
- iso: eng
publication: Proceedings of the 2024 Prognostics and System Health Management Conference
(PHM)
publication_identifier:
isbn:
- 979-8-3503-6058-5
publisher: IEEE Computer Society
quality_controlled: '1'
status: public
title: 'Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach
for Enhanced System Health Assessment'
type: conference
user_id: '54290'
year: '2024'
...
---
_id: '61756'
author:
- first_name: Claus
full_name: Scheidemann, Claus
id: '38259'
last_name: Scheidemann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Scheidemann C, Hemsel T, Sextro W. Characteristic behavior of lead-free and
lead-containing piezo ring ceramics in ultrasonic transducers. In: ; 2024.'
apa: Scheidemann, C., Hemsel, T., & Sextro, W. (2024). Characteristic behavior
of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers.
21nd International Workshop on Piezoelectric Materials and Applications in Actuators
(IWPMA), Hannover, Germany.
bibtex: '@inproceedings{Scheidemann_Hemsel_Sextro_2024, title={Characteristic behavior
of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers},
author={Scheidemann, Claus and Hemsel, Tobias and Sextro, Walter}, year={2024}
}'
chicago: Scheidemann, Claus, Tobias Hemsel, and Walter Sextro. “Characteristic Behavior
of Lead-Free and Lead-Containing Piezo Ring Ceramics in Ultrasonic Transducers,”
2024.
ieee: C. Scheidemann, T. Hemsel, and W. Sextro, “Characteristic behavior of lead-free
and lead-containing piezo ring ceramics in ultrasonic transducers,” presented
at the 21nd International Workshop on Piezoelectric Materials and Applications
in Actuators (IWPMA), Hannover, Germany, 2024.
mla: Scheidemann, Claus, et al. Characteristic Behavior of Lead-Free and Lead-Containing
Piezo Ring Ceramics in Ultrasonic Transducers. 2024.
short: 'C. Scheidemann, T. Hemsel, W. Sextro, in: 2024.'
conference:
end_date: 2024-07-26
location: Hannover, Germany
name: 21nd International Workshop on Piezoelectric Materials and Applications in
Actuators (IWPMA)
start_date: 2024-07-22
date_created: 2025-10-08T14:28:33Z
date_updated: 2026-03-02T11:00:14Z
ddc:
- '620'
department:
- _id: '151'
file:
- access_level: open_access
content_type: application/pdf
creator: hemsel
date_created: 2026-01-30T14:50:06Z
date_updated: 2026-03-02T11:00:13Z
file_id: '63820'
file_name: IWPMA_2024_Scheidemann.pdf
file_size: 1984385
relation: main_file
file_date_updated: 2026-03-02T11:00:13Z
has_accepted_license: '1'
language:
- iso: eng
oa: '1'
status: public
title: Characteristic behavior of lead-free and lead-containing piezo ring ceramics
in ultrasonic transducers
type: conference
user_id: '210'
year: '2024'
...