---
_id: '58510'
abstract:
- lang: eng
  text: '<jats:p>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.</jats:p>'
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. <i>Actuators</i>. 2025;14(2). doi:<a href="https://doi.org/10.3390/act14020055">10.3390/act14020055</a>
  apa: Scheidemann, C., Bornmann, P., Littmann, W., &#38; Hemsel, T. (2025). Lead-Free
    Ceramics in Prestressed Ultrasonic Transducers. <i>Actuators</i>, <i>14</i>(2),
    Article 55. <a href="https://doi.org/10.3390/act14020055">https://doi.org/10.3390/act14020055</a>
  bibtex: '@article{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Lead-Free Ceramics
    in Prestressed Ultrasonic Transducers}, volume={14}, DOI={<a href="https://doi.org/10.3390/act14020055">10.3390/act14020055</a>},
    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.” <i>Actuators</i> 14,
    no. 2 (2025). <a href="https://doi.org/10.3390/act14020055">https://doi.org/10.3390/act14020055</a>.
  ieee: 'C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Lead-Free Ceramics
    in Prestressed Ultrasonic Transducers,” <i>Actuators</i>, vol. 14, no. 2, Art.
    no. 55, 2025, doi: <a href="https://doi.org/10.3390/act14020055">10.3390/act14020055</a>.'
  mla: Scheidemann, Claus, et al. “Lead-Free Ceramics in Prestressed Ultrasonic Transducers.”
    <i>Actuators</i>, vol. 14, no. 2, 55, MDPI AG, 2025, doi:<a href="https://doi.org/10.3390/act14020055">10.3390/act14020055</a>.
  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: '62300'
author:
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Jonas
  full_name: Hölscher, Jonas
  id: '73952'
  last_name: Hölscher
- 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: Tobias
  full_name: Hemsel, Tobias
  id: '210'
  last_name: Hemsel
- first_name: Bernd
  full_name: Henning, Bernd
  id: '213'
  last_name: Henning
citation:
  ama: 'Claes L, Hölscher J, Friesen O, Scheidemann C, Hemsel T, Henning B. Estimation
    of third order elastic constants of piezoceramics using DC biased impedance measurements.
    In: <i>2025 International Congress on Ultrasonics</i>. AMA Service GmbH; 2025:142–145.
    doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>'
  apa: Claes, L., Hölscher, J., Friesen, O., Scheidemann, C., Hemsel, T., &#38; Henning,
    B. (2025). Estimation of third order elastic constants of piezoceramics using
    DC biased impedance measurements. <i>2025 International Congress on Ultrasonics</i>,
    142–145. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">https://doi.org/10.5162/ultrasonic2025/a18-a6</a>
  bibtex: '@inproceedings{Claes_Hölscher_Friesen_Scheidemann_Hemsel_Henning_2025,
    place={Paderborn}, title={Estimation of third order elastic constants of piezoceramics
    using DC biased impedance measurements}, DOI={<a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>},
    booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service
    GmbH}, author={Claes, Leander and Hölscher, Jonas and Friesen, Olga and Scheidemann,
    Claus and Hemsel, Tobias and Henning, Bernd}, year={2025}, pages={142–145} }'
  chicago: 'Claes, Leander, Jonas Hölscher, Olga Friesen, Claus Scheidemann, Tobias
    Hemsel, and Bernd Henning. “Estimation of Third Order Elastic Constants of Piezoceramics
    Using DC Biased Impedance Measurements.” In <i>2025 International Congress on
    Ultrasonics</i>, 142–145. Paderborn: AMA Service GmbH, 2025. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">https://doi.org/10.5162/ultrasonic2025/a18-a6</a>.'
  ieee: 'L. Claes, J. Hölscher, O. Friesen, C. Scheidemann, T. Hemsel, and B. Henning,
    “Estimation of third order elastic constants of piezoceramics using DC biased
    impedance measurements,” in <i>2025 International Congress on Ultrasonics</i>,
    2025, pp. 142–145, doi: <a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>.'
  mla: Claes, Leander, et al. “Estimation of Third Order Elastic Constants of Piezoceramics
    Using DC Biased Impedance Measurements.” <i>2025 International Congress on Ultrasonics</i>,
    AMA Service GmbH, 2025, pp. 142–145, doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a6">10.5162/ultrasonic2025/a18-a6</a>.
  short: 'L. Claes, J. Hölscher, O. Friesen, C. Scheidemann, T. Hemsel, B. Henning,
    in: 2025 International Congress on Ultrasonics, AMA Service GmbH, Paderborn, 2025,
    pp. 142–145.'
date_created: 2025-11-25T12:23:06Z
date_updated: 2026-01-13T13:00:31Z
department:
- _id: '49'
doi: 10.5162/ultrasonic2025/a18-a6
language:
- iso: eng
page: 142–145
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: Estimation of third order elastic constants of piezoceramics using DC biased
  impedance measurements
type: conference
user_id: '11829'
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., &#38; Hemsel, T. (2025). <i>Bolted
    Langevin transducers with leadfree piezoelectric ceramics</i>. 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. <i>Bolted Langevin Transducers with Leadfree Piezoelectric
    Ceramics</i>. 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., &#38; Sextro, W. (2025).
    <i>Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic
    transducer with focussing sonotrode</i>. 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. <i>Intensive Ultrasonic Cleaning of Surfaces by Means
    of Lead-Free Ultrasonic Transducer with Focussing Sonotrode</i>. 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., &#38; Sextro, W. (2025). <i>Time dependent material
    characteristics of prestressed piezoelectric ceramics in langevin transducers</i>.
    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. <i>Time Dependent Material Characteristics of Prestressed
    Piezoelectric Ceramics in Langevin Transducers</i>. 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., &#38; Sextro, W. (2025). <i>Investigation
    of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers</i>.
    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. <i>Investigation of the Setting Behaviour of Mechanically
    Biased Piezoelectric Ultrasonic Transducers</i>. 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: '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., &#38; Sextro, W. (2025).
    <i>Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems</i>.
  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. <i>Modellgestützte Optimierung Eines Ultraschall-Torsionsschweißsystems</i>.
    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: '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: <i>2025
    International Congress on Ultrasonics</i>. AMA Service GmbH; 2025:138–141. doi:<a
    href="https://doi.org/10.5162/ultrasonic2025/a18-a4">10.5162/ultrasonic2025/a18-a4</a>'
  apa: Friesen, O., Scheidemann, C., Claes, L., Hemsel, T., &#38; Henning, B. (2025).
    Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin
    Transducer. <i>2025 International Congress on Ultrasonics</i>, 138–141. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a4">https://doi.org/10.5162/ultrasonic2025/a18-a4</a>
  bibtex: '@inproceedings{Friesen_Scheidemann_Claes_Hemsel_Henning_2025, place={Paderborn},
    title={Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed
    Langevin Transducer}, DOI={<a href="https://doi.org/10.5162/ultrasonic2025/a18-a4">10.5162/ultrasonic2025/a18-a4</a>},
    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 <i>2025 International Congress on Ultrasonics</i>, 138–141.
    Paderborn: AMA Service GmbH, 2025. <a href="https://doi.org/10.5162/ultrasonic2025/a18-a4">https://doi.org/10.5162/ultrasonic2025/a18-a4</a>.'
  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 <i>2025 International Congress on Ultrasonics</i>, 2025, pp. 138–141, doi:
    <a href="https://doi.org/10.5162/ultrasonic2025/a18-a4">10.5162/ultrasonic2025/a18-a4</a>.'
  mla: Friesen, Olga, et al. “Sensitivity Analysis and Material Parameter Estimation
    of a Pre-Stressed Langevin Transducer.” <i>2025 International Congress on Ultrasonics</i>,
    AMA Service GmbH, 2025, pp. 138–141, doi:<a href="https://doi.org/10.5162/ultrasonic2025/a18-a4">10.5162/ultrasonic2025/a18-a4</a>.
  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: '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., &#38; Hemsel, T. (2025). <i>Innovative
    lead-free ultrasonic bending transducers for low to medium power applications</i>.
    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. <i>Innovative Lead-Free Ultrasonic Bending Transducers
    for Low to Medium Power Applications</i>. 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., &#38; Scheidemann, C. (2025). <i>Power
    ultrasonic actuators with suddenly changing loads: How to control the amplitudes
    in resonance,  antiresonance, or in-between</i>. 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. <i>Power Ultrasonic Actuators with Suddenly Changing
    Loads: How to Control the Amplitudes in Resonance,  Antiresonance, or in-Between</i>.
    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. <i>Electronics</i>.
    2024;13(3). doi:<a href="https://doi.org/10.3390/electronics13030521">10.3390/electronics13030521</a>
  apa: Aimiyekagbon, O. K., Bender, A., Hemsel, T., &#38; Sextro, W. (2024). Diagnostics
    of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions.
    <i>Electronics</i>, <i>13</i>(3), Article 521. <a href="https://doi.org/10.3390/electronics13030521">https://doi.org/10.3390/electronics13030521</a>
  bibtex: '@article{Aimiyekagbon_Bender_Hemsel_Sextro_2024, title={Diagnostics of
    Piezoelectric Bending Actuators Subjected to Varying Operating Conditions}, volume={13},
    DOI={<a href="https://doi.org/10.3390/electronics13030521">10.3390/electronics13030521</a>},
    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.” <i>Electronics</i> 13, no. 3 (2024). <a href="https://doi.org/10.3390/electronics13030521">https://doi.org/10.3390/electronics13030521</a>.
  ieee: 'O. K. Aimiyekagbon, A. Bender, T. Hemsel, and W. Sextro, “Diagnostics of
    Piezoelectric Bending Actuators Subjected to Varying Operating Conditions,” <i>Electronics</i>,
    vol. 13, no. 3, Art. no. 521, 2024, doi: <a href="https://doi.org/10.3390/electronics13030521">10.3390/electronics13030521</a>.'
  mla: Aimiyekagbon, Osarenren Kennedy, et al. “Diagnostics of Piezoelectric Bending
    Actuators Subjected to Varying Operating Conditions.” <i>Electronics</i>, vol.
    13, no. 3, 521, MDPI AG, 2024, doi:<a href="https://doi.org/10.3390/electronics13030521">10.3390/electronics13030521</a>.
  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: '57467'
abstract:
- lang: eng
  text: <jats:p>Additive manufacturing of metallic components often results in the
    formation of columnar grain structures aligned along the build direction. These
    elongated grains can introduce anisotropy, negatively impacting the mechanical
    properties of the components. This study aimed to achieve controlled solidification
    with a fine-grained microstructure to enhance the mechanical performance of printed
    parts. Stainless steel 316L was used as the test material. High-intensity ultrasound
    was applied during the direct energy deposition (DED) process to inhibit the formation
    of columnar grains. The investigation emphasized the importance of amplitude changes
    of the ultrasound wave as the system’s geometry continuously evolves with the
    addition of multiple layers and assessed how these changes influence the grain
    size and distribution. Initial tests revealed significant amplitude fluctuations
    during layer deposition, highlighting the impact of layer deposition on process
    uniformity. The mechanical results demonstrated that the application of ultrasound
    effectively refined the grain structure, leading to a 15% increase in tensile
    strength compared to conventionally additively manufactured samples.</jats:p>
article_number: '1001'
author:
- first_name: Dennis
  full_name: Lehnert, Dennis
  id: '90491'
  last_name: Lehnert
- first_name: Christian
  full_name: Bödger, Christian
  id: '93904'
  last_name: Bödger
- first_name: Philipp
  full_name: Pabel, Philipp
  id: '67374'
  last_name: Pabel
- 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: Stefan
  full_name: Gnaase, Stefan
  id: '25730'
  last_name: Gnaase
- first_name: David
  full_name: Kostka, David
  last_name: Kostka
- first_name: Thomas
  full_name: Tröster, Thomas
  id: '553'
  last_name: Tröster
citation:
  ama: Lehnert D, Bödger C, Pabel P, et al. The Influence of Ultrasonic Irradiation
    of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced
    Component. <i>Crystals</i>. 2024;14(11). doi:<a href="https://doi.org/10.3390/cryst14111001">10.3390/cryst14111001</a>
  apa: Lehnert, D., Bödger, C., Pabel, P., Scheidemann, C., Hemsel, T., Gnaase, S.,
    Kostka, D., &#38; Tröster, T. (2024). The Influence of Ultrasonic Irradiation
    of a 316L Weld Pool Produced by DED on the Mechanical Properties of the Produced
    Component. <i>Crystals</i>, <i>14</i>(11), Article 1001. <a href="https://doi.org/10.3390/cryst14111001">https://doi.org/10.3390/cryst14111001</a>
  bibtex: '@article{Lehnert_Bödger_Pabel_Scheidemann_Hemsel_Gnaase_Kostka_Tröster_2024,
    title={The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by
    DED on the Mechanical Properties of the Produced Component}, volume={14}, DOI={<a
    href="https://doi.org/10.3390/cryst14111001">10.3390/cryst14111001</a>}, number={111001},
    journal={Crystals}, publisher={MDPI AG}, author={Lehnert, Dennis and Bödger, Christian
    and Pabel, Philipp and Scheidemann, Claus and Hemsel, Tobias and Gnaase, Stefan
    and Kostka, David and Tröster, Thomas}, year={2024} }'
  chicago: Lehnert, Dennis, Christian Bödger, Philipp Pabel, Claus Scheidemann, Tobias
    Hemsel, Stefan Gnaase, David Kostka, and Thomas Tröster. “The Influence of Ultrasonic
    Irradiation of a 316L Weld Pool Produced by DED on the Mechanical Properties of
    the Produced Component.” <i>Crystals</i> 14, no. 11 (2024). <a href="https://doi.org/10.3390/cryst14111001">https://doi.org/10.3390/cryst14111001</a>.
  ieee: 'D. Lehnert <i>et al.</i>, “The Influence of Ultrasonic Irradiation of a 316L
    Weld Pool Produced by DED on the Mechanical Properties of the Produced Component,”
    <i>Crystals</i>, vol. 14, no. 11, Art. no. 1001, 2024, doi: <a href="https://doi.org/10.3390/cryst14111001">10.3390/cryst14111001</a>.'
  mla: Lehnert, Dennis, et al. “The Influence of Ultrasonic Irradiation of a 316L
    Weld Pool Produced by DED on the Mechanical Properties of the Produced Component.”
    <i>Crystals</i>, vol. 14, no. 11, 1001, MDPI AG, 2024, doi:<a href="https://doi.org/10.3390/cryst14111001">10.3390/cryst14111001</a>.
  short: D. Lehnert, C. Bödger, P. Pabel, C. Scheidemann, T. Hemsel, S. Gnaase, D.
    Kostka, T. Tröster, Crystals 14 (2024).
date_created: 2024-11-28T08:45:06Z
date_updated: 2026-02-23T08:07:37Z
ddc:
- '670'
department:
- _id: '149'
- _id: '321'
- _id: '9'
doi: 10.3390/cryst14111001
file:
- access_level: closed
  content_type: application/pdf
  creator: dlehnert
  date_created: 2024-11-28T08:52:48Z
  date_updated: 2024-11-28T08:52:48Z
  file_id: '57470'
  file_name: crystals-14-01001-v2 (4).pdf
  file_size: 5779744
  relation: main_file
  success: 1
file_date_updated: 2024-11-28T08:52:48Z
has_accepted_license: '1'
intvolume: '        14'
issue: '11'
language:
- iso: eng
publication: Crystals
publication_identifier:
  issn:
  - 2073-4352
publication_status: published
publisher: MDPI AG
quality_controlled: '1'
status: public
title: The Influence of Ultrasonic Irradiation of a 316L Weld Pool Produced by DED
  on the Mechanical Properties of the Produced Component
type: journal_article
user_id: '93904'
volume: 14
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., &#38; Sextro, W. (2024). <i>Characteristic behavior
    of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers</i>.
    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. <i>Characteristic Behavior of Lead-Free and Lead-Containing
    Piezo Ring Ceramics in Ultrasonic Transducers</i>. 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'
...
---
_id: '56834'
author:
- first_name: Olga
  full_name: Friesen, Olga
  id: '44026'
  last_name: Friesen
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Claus
  full_name: Scheidemann, Claus
  id: '38259'
  last_name: Scheidemann
- first_name: Nadine
  full_name: Feldmann, Nadine
  id: '23082'
  last_name: Feldmann
- 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, Claes L, Scheidemann C, Feldmann N, Hemsel T, Henning B. Estimation
    of temperature-dependent piezoelectric material parameters using ring-shaped specimens.
    In: <i>2023 International Congress on Ultrasonics, Beijing, China</i>. Vol 2822.
    IOP Publishing; 2024:012125. doi:<a href="https://doi.org/10.1088/1742-6596/2822/1/012125">10.1088/1742-6596/2822/1/012125</a>'
  apa: Friesen, O., Claes, L., Scheidemann, C., Feldmann, N., Hemsel, T., &#38; Henning,
    B. (2024). Estimation of temperature-dependent piezoelectric material parameters
    using ring-shaped specimens. <i>2023 International Congress on Ultrasonics, Beijing,
    China</i>, <i>2822</i>, 012125. <a href="https://doi.org/10.1088/1742-6596/2822/1/012125">https://doi.org/10.1088/1742-6596/2822/1/012125</a>
  bibtex: '@inproceedings{Friesen_Claes_Scheidemann_Feldmann_Hemsel_Henning_2024,
    title={Estimation of temperature-dependent piezoelectric material parameters using
    ring-shaped specimens}, volume={2822}, DOI={<a href="https://doi.org/10.1088/1742-6596/2822/1/012125">10.1088/1742-6596/2822/1/012125</a>},
    booktitle={2023 International Congress on Ultrasonics, Beijing, China}, publisher={IOP
    Publishing}, author={Friesen, Olga and Claes, Leander and Scheidemann, Claus and
    Feldmann, Nadine and Hemsel, Tobias and Henning, Bernd}, year={2024}, pages={012125}
    }'
  chicago: Friesen, Olga, Leander Claes, Claus Scheidemann, Nadine Feldmann, Tobias
    Hemsel, and Bernd Henning. “Estimation of Temperature-Dependent Piezoelectric
    Material Parameters Using Ring-Shaped Specimens.” In <i>2023 International Congress
    on Ultrasonics, Beijing, China</i>, 2822:012125. IOP Publishing, 2024. <a href="https://doi.org/10.1088/1742-6596/2822/1/012125">https://doi.org/10.1088/1742-6596/2822/1/012125</a>.
  ieee: 'O. Friesen, L. Claes, C. Scheidemann, N. Feldmann, T. Hemsel, and B. Henning,
    “Estimation of temperature-dependent piezoelectric material parameters using ring-shaped
    specimens,” in <i>2023 International Congress on Ultrasonics, Beijing, China</i>,
    2024, vol. 2822, p. 012125, doi: <a href="https://doi.org/10.1088/1742-6596/2822/1/012125">10.1088/1742-6596/2822/1/012125</a>.'
  mla: Friesen, Olga, et al. “Estimation of Temperature-Dependent Piezoelectric Material
    Parameters Using Ring-Shaped Specimens.” <i>2023 International Congress on Ultrasonics,
    Beijing, China</i>, vol. 2822, IOP Publishing, 2024, p. 012125, doi:<a href="https://doi.org/10.1088/1742-6596/2822/1/012125">10.1088/1742-6596/2822/1/012125</a>.
  short: 'O. Friesen, L. Claes, C. Scheidemann, N. Feldmann, T. Hemsel, B. Henning,
    in: 2023 International Congress on Ultrasonics, Beijing, China, IOP Publishing,
    2024, p. 012125.'
date_created: 2024-10-31T07:59:01Z
date_updated: 2026-01-05T07:58:55Z
department:
- _id: '49'
doi: 10.1088/1742-6596/2822/1/012125
intvolume: '      2822'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://iopscience.iop.org/article/10.1088/1742-6596/2822/1/012125
oa: '1'
page: '012125'
project:
- _id: '245'
  name: 'FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken
    für Leistungsschallanwendungen (NEPTUN)'
publication: 2023 International Congress on Ultrasonics, Beijing, China
publication_identifier:
  issn:
  - 1742-6596
publisher: IOP Publishing
status: public
title: Estimation of temperature-dependent piezoelectric material parameters using
  ring-shaped specimens
type: conference
user_id: '11829'
volume: 2822
year: '2024'
...
---
_id: '51119'
author:
- first_name: Claus
  full_name: Scheidemann, Claus
  id: '38259'
  last_name: Scheidemann
- first_name: Oliver Ernst Caspar
  full_name: Hagedorn, Oliver Ernst Caspar
  id: '53321'
  last_name: Hagedorn
- 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, Hagedorn OEC, Hemsel T, Sextro W. Experimental Investigation
    of Bond Formation and Wire Deformation in the Ultrasonic Wire Bonding Process.
    In: ; 2023.'
  apa: Scheidemann, C., Hagedorn, O. E. C., Hemsel, T., &#38; Sextro, W. (2023). <i>Experimental
    Investigation of Bond Formation and Wire Deformation in the Ultrasonic Wire Bonding
    Process</i>. International Conference on Functional Materials &#38; Devices 2023
    (ICFMD 2023), Jeju, Korea.
  bibtex: '@inproceedings{Scheidemann_Hagedorn_Hemsel_Sextro_2023, title={Experimental
    Investigation of Bond Formation and Wire Deformation in the Ultrasonic Wire Bonding
    Process}, author={Scheidemann, Claus and Hagedorn, Oliver Ernst Caspar and Hemsel,
    Tobias and Sextro, Walter}, year={2023} }'
  chicago: Scheidemann, Claus, Oliver Ernst Caspar Hagedorn, Tobias Hemsel, and Walter
    Sextro. “Experimental Investigation of Bond Formation and Wire Deformation in
    the Ultrasonic Wire Bonding Process,” 2023.
  ieee: C. Scheidemann, O. E. C. Hagedorn, T. Hemsel, and W. Sextro, “Experimental
    Investigation of Bond Formation and Wire Deformation in the Ultrasonic Wire Bonding
    Process,” presented at the International Conference on Functional Materials &#38;
    Devices 2023 (ICFMD 2023), Jeju, Korea, 2023.
  mla: Scheidemann, Claus, et al. <i>Experimental Investigation of Bond Formation
    and Wire Deformation in the Ultrasonic Wire Bonding Process</i>. 2023.
  short: 'C. Scheidemann, O.E.C. Hagedorn, T. Hemsel, W. Sextro, in: 2023.'
conference:
  end_date: 2023-11-03
  location: Jeju, Korea
  name: International Conference on Functional Materials & Devices 2023 (ICFMD 2023)
  start_date: 2023-10-31
date_created: 2024-02-01T16:03:41Z
date_updated: 2024-02-01T16:04:33Z
department:
- _id: '151'
language:
- iso: eng
status: public
title: Experimental Investigation of Bond Formation and Wire Deformation in the Ultrasonic
  Wire Bonding Process
type: conference_abstract
user_id: '38259'
year: '2023'
...
---
_id: '47234'
author:
- first_name: Birte
  full_name: Sehlmeyer, Birte
  last_name: Sehlmeyer
- first_name: 'Rebecca '
  full_name: 'Kampmann, Rebecca '
  last_name: Kampmann
- 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: 'Mathias '
  full_name: 'Getzlaff, Mathias '
  last_name: Getzlaff
citation:
  ama: 'Sehlmeyer B, Kampmann R, Scheidemann C, Hemsel T, Getzlaff M. Burst Mode of
    Ultrasonic Resonant Oscillations for Stimulation and Destruction of Tumor Cells.
    In: Deutsche Physikalische Gesellschaft e. V., ed. <i>Frühjahrstagung 2023, Sektion
    Kondensierte Materie (SKM)</i>. ; 2023.'
  apa: Sehlmeyer, B., Kampmann, R., Scheidemann, C., Hemsel, T., &#38; Getzlaff, M.
    (2023). Burst Mode of Ultrasonic Resonant Oscillations for Stimulation and Destruction
    of Tumor Cells. In Deutsche Physikalische Gesellschaft e. V. (Ed.), <i>Frühjahrstagung
    2023, Sektion Kondensierte Materie (SKM)</i>.
  bibtex: '@inproceedings{Sehlmeyer_Kampmann_Scheidemann_Hemsel_Getzlaff_2023, title={Burst
    Mode of Ultrasonic Resonant Oscillations for Stimulation and Destruction of Tumor
    Cells}, booktitle={Frühjahrstagung 2023, Sektion Kondensierte Materie (SKM)},
    author={Sehlmeyer, Birte and Kampmann, Rebecca  and Scheidemann, Claus and Hemsel,
    Tobias and Getzlaff, Mathias }, editor={Deutsche Physikalische Gesellschaft e.
    V.}, year={2023} }'
  chicago: Sehlmeyer, Birte, Rebecca  Kampmann, Claus Scheidemann, Tobias Hemsel,
    and Mathias  Getzlaff. “Burst Mode of Ultrasonic Resonant Oscillations for Stimulation
    and Destruction of Tumor Cells.” In <i>Frühjahrstagung 2023, Sektion Kondensierte
    Materie (SKM)</i>, edited by Deutsche Physikalische Gesellschaft e. V., 2023.
  ieee: B. Sehlmeyer, R. Kampmann, C. Scheidemann, T. Hemsel, and M. Getzlaff, “Burst
    Mode of Ultrasonic Resonant Oscillations for Stimulation and Destruction of Tumor
    Cells,” in <i>Frühjahrstagung 2023, Sektion Kondensierte Materie (SKM)</i>, Dresden,
    2023.
  mla: Sehlmeyer, Birte, et al. “Burst Mode of Ultrasonic Resonant Oscillations for
    Stimulation and Destruction of Tumor Cells.” <i>Frühjahrstagung 2023, Sektion
    Kondensierte Materie (SKM)</i>, edited by Deutsche Physikalische Gesellschaft
    e. V., 2023.
  short: 'B. Sehlmeyer, R. Kampmann, C. Scheidemann, T. Hemsel, M. Getzlaff, in: Deutsche
    Physikalische Gesellschaft e. V. (Ed.), Frühjahrstagung 2023, Sektion Kondensierte
    Materie (SKM), 2023.'
conference:
  end_date: 2023-03-31
  location: Dresden
  name: 'Deutsche Physikalische Gesellschaft e. V., Frühjahrstagung 2023, Sektion
    Kondensierte Marterie (SKM) '
  start_date: 2023-03-26
corporate_editor:
- Deutsche Physikalische Gesellschaft e. V.
date_created: 2023-09-22T12:13:25Z
date_updated: 2023-09-28T09:58:48Z
department:
- _id: '151'
language:
- iso: eng
publication: Frühjahrstagung 2023, Sektion Kondensierte Materie (SKM)
related_material:
  link:
  - relation: confirmation
    url: https://www.dpg-verhandlungen.de/year/2023/conference/skm/part/bp/session/28/contribution/27
status: public
title: Burst Mode of Ultrasonic Resonant Oscillations for Stimulation and Destruction
  of Tumor Cells
type: conference_abstract
user_id: '210'
year: '2023'
...
---
_id: '47235'
author:
- first_name: Rebecca
  full_name: Kampmann, Rebecca
  last_name: Kampmann
- first_name: Birte
  full_name: Sehlmeyer, Birte
  last_name: Sehlmeyer
- 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: Mathias
  full_name: Getzlaff, Mathias
  last_name: Getzlaff
citation:
  ama: 'Kampmann R, Sehlmeyer B, Scheidemann C, Hemsel T, Getzlaff M. Burst Mode Characteristics
    of an Ultrasonic Transducer for Treatment of Cancer Cells. In: Deutsche Physikalische
    Gesellschaft e. V., ed. <i>Frühjahrstagung 2023, Sektion Kondensierte Marterie
    (SKM)</i>. ; 2023.'
  apa: Kampmann, R., Sehlmeyer, B., Scheidemann, C., Hemsel, T., &#38; Getzlaff, M.
    (2023). Burst Mode Characteristics of an Ultrasonic Transducer for Treatment of
    Cancer Cells. In Deutsche Physikalische Gesellschaft e. V. (Ed.), <i>Frühjahrstagung
    2023, Sektion Kondensierte Marterie (SKM)</i>.
  bibtex: '@inproceedings{Kampmann_Sehlmeyer_Scheidemann_Hemsel_Getzlaff_2023, title={Burst
    Mode Characteristics of an Ultrasonic Transducer for Treatment of Cancer Cells},
    booktitle={Frühjahrstagung 2023, Sektion Kondensierte Marterie (SKM)}, author={Kampmann,
    Rebecca and Sehlmeyer, Birte and Scheidemann, Claus and Hemsel, Tobias and Getzlaff,
    Mathias}, editor={Deutsche Physikalische Gesellschaft e. V.}, year={2023} }'
  chicago: Kampmann, Rebecca, Birte Sehlmeyer, Claus Scheidemann, Tobias Hemsel, and
    Mathias Getzlaff. “Burst Mode Characteristics of an Ultrasonic Transducer for
    Treatment of Cancer Cells.” In <i>Frühjahrstagung 2023, Sektion Kondensierte Marterie
    (SKM)</i>, edited by Deutsche Physikalische Gesellschaft e. V., 2023.
  ieee: R. Kampmann, B. Sehlmeyer, C. Scheidemann, T. Hemsel, and M. Getzlaff, “Burst
    Mode Characteristics of an Ultrasonic Transducer for Treatment of Cancer Cells,”
    in <i>Frühjahrstagung 2023, Sektion Kondensierte Marterie (SKM)</i>, Dresden,
    2023.
  mla: Kampmann, Rebecca, et al. “Burst Mode Characteristics of an Ultrasonic Transducer
    for Treatment of Cancer Cells.” <i>Frühjahrstagung 2023, Sektion Kondensierte
    Marterie (SKM)</i>, edited by Deutsche Physikalische Gesellschaft e. V., 2023.
  short: 'R. Kampmann, B. Sehlmeyer, C. Scheidemann, T. Hemsel, M. Getzlaff, in: Deutsche
    Physikalische Gesellschaft e. V. (Ed.), Frühjahrstagung 2023, Sektion Kondensierte
    Marterie (SKM), 2023.'
conference:
  end_date: 2023-03-31
  location: Dresden
  name: Deutsche Physikalische Gesellschaft e. V., Frühjahrstagung 2023, Sektion Kondensierte
    Marterie (SKM)
  start_date: 2023-03-26
corporate_editor:
- Deutsche Physikalische Gesellschaft e. V.
date_created: 2023-09-22T12:19:07Z
date_updated: 2023-09-28T09:54:55Z
department:
- _id: '151'
language:
- iso: eng
publication: Frühjahrstagung 2023, Sektion Kondensierte Marterie (SKM)
related_material:
  link:
  - relation: confirmation
    url: https://www.dpg-verhandlungen.de/year/2023/conference/skm/part/bp/session/28/contribution/26
status: public
title: Burst Mode Characteristics of an Ultrasonic Transducer for Treatment of Cancer
  Cells
type: conference_abstract
user_id: '210'
year: '2023'
...
---
_id: '51117'
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: Olga
  full_name: Friesen, Olga
  id: '44026'
  last_name: Friesen
- first_name: Leander
  full_name: Claes, Leander
  id: '11829'
  last_name: Claes
  orcid: 0000-0002-4393-268X
- first_name: Walter
  full_name: Sextro, Walter
  id: '21220'
  last_name: Sextro
citation:
  ama: 'Scheidemann C, Hemsel T, Friesen O, Claes L, Sextro W. Influence of Temperature
    and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics.
    In: ; 2023.'
  apa: Scheidemann, C., Hemsel, T., Friesen, O., Claes, L., &#38; Sextro, W. (2023).
    <i>Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior
    of Ring-Shaped Ceramics</i>. 7th International Conference on Advanced Electromaterials
    (ICAE 2023), Jeju, Korea.
  bibtex: '@inproceedings{Scheidemann_Hemsel_Friesen_Claes_Sextro_2023, title={Influence
    of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped
    Ceramics}, author={Scheidemann, Claus and Hemsel, Tobias and Friesen, Olga and
    Claes, Leander and Sextro, Walter}, year={2023} }'
  chicago: Scheidemann, Claus, Tobias Hemsel, Olga Friesen, Leander Claes, and Walter
    Sextro. “Influence of Temperature and Pre-Stress on the Piezoelectric Material
    Behavior of Ring-Shaped Ceramics,” 2023.
  ieee: C. Scheidemann, T. Hemsel, O. Friesen, L. Claes, and W. Sextro, “Influence
    of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped
    Ceramics,” presented at the 7th International Conference on Advanced Electromaterials
    (ICAE 2023), Jeju, Korea, 2023.
  mla: Scheidemann, Claus, et al. <i>Influence of Temperature and Pre-Stress on the
    Piezoelectric Material Behavior of Ring-Shaped Ceramics</i>. 2023.
  short: 'C. Scheidemann, T. Hemsel, O. Friesen, L. Claes, W. Sextro, in: 2023.'
conference:
  end_date: 2023-11-03
  location: Jeju, Korea
  name: 7th International Conference on Advanced Electromaterials (ICAE 2023)
  start_date: 2023-10-31
date_created: 2024-02-01T15:55:44Z
date_updated: 2026-03-02T10:59:13Z
ddc:
- '620'
department:
- _id: '151'
- _id: '49'
file:
- access_level: open_access
  content_type: application/pdf
  creator: hemsel
  date_created: 2026-01-30T07:15:31Z
  date_updated: 2026-03-02T10:59:13Z
  file_id: '63815'
  file_name: Sch23_ICAE_2023.pdf
  file_size: 608243
  relation: main_file
file_date_updated: 2026-03-02T10:59:13Z
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: Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior
  of Ring-Shaped Ceramics
type: conference
user_id: '210'
year: '2023'
...
---
_id: '33500'
abstract:
- lang: eng
  text: 'This article is dedicated to piezoelectric ultrasonic power transducers that
    differ to well known medical ultrasonic diagnostic apparatus or non destructive
    testing devices by the level of power in use; typically several tens of up to
    more than thousand watts are used in a multitude of different applications. After
    a short introduction including historical development, the first focus is on theoretical
    background of the operating principle, design and mechanical modeling. As piezoelectric
    elements transform electrical to mechanical energy and vice versa, equivalent
    circuit modeling is also described. After that, sample applications are delineated
    by the matter wherein ultrasound generates unique effects: incredible high pressure
    level as well in air as in water, micro-bubbles generating temperature peaks for
    very short time instances in fluids, acoustoplastic effect, enhancement of diffusion
    and recrystallization in solids, friction manipulation, incremental deformation
    and micro-cracking of surfaces, or even generation of macroscopic movements in
    motors. At the end, some future directions ranging from novel modeling approaches
    to advanced control and new materials are addressed.'
author:
- first_name: Tobias
  full_name: Hemsel, Tobias
  id: '210'
  last_name: Hemsel
- first_name: Jens
  full_name: Twiefel, Jens
  last_name: Twiefel
citation:
  ama: 'Hemsel T, Twiefel J. Piezoelectric Ultrasonic Power Transducers. In: <i>Reference
    Module in Materials Science and Materials Engineering</i>. Elsevier; 2022. doi:<a
    href="https://doi.org/10.1016/b978-0-12-819728-8.00047-4">10.1016/b978-0-12-819728-8.00047-4</a>'
  apa: Hemsel, T., &#38; Twiefel, J. (2022). Piezoelectric Ultrasonic Power Transducers.
    In <i>Reference Module in Materials Science and Materials Engineering</i>. Elsevier.
    <a href="https://doi.org/10.1016/b978-0-12-819728-8.00047-4">https://doi.org/10.1016/b978-0-12-819728-8.00047-4</a>
  bibtex: '@inbook{Hemsel_Twiefel_2022, title={Piezoelectric Ultrasonic Power Transducers},
    DOI={<a href="https://doi.org/10.1016/b978-0-12-819728-8.00047-4">10.1016/b978-0-12-819728-8.00047-4</a>},
    booktitle={Reference Module in Materials Science and Materials Engineering}, publisher={Elsevier},
    author={Hemsel, Tobias and Twiefel, Jens}, year={2022} }'
  chicago: Hemsel, Tobias, and Jens Twiefel. “Piezoelectric Ultrasonic Power Transducers.”
    In <i>Reference Module in Materials Science and Materials Engineering</i>. Elsevier,
    2022. <a href="https://doi.org/10.1016/b978-0-12-819728-8.00047-4">https://doi.org/10.1016/b978-0-12-819728-8.00047-4</a>.
  ieee: T. Hemsel and J. Twiefel, “Piezoelectric Ultrasonic Power Transducers,” in
    <i>Reference Module in Materials Science and Materials Engineering</i>, Elsevier,
    2022.
  mla: Hemsel, Tobias, and Jens Twiefel. “Piezoelectric Ultrasonic Power Transducers.”
    <i>Reference Module in Materials Science and Materials Engineering</i>, Elsevier,
    2022, doi:<a href="https://doi.org/10.1016/b978-0-12-819728-8.00047-4">10.1016/b978-0-12-819728-8.00047-4</a>.
  short: 'T. Hemsel, J. Twiefel, in: Reference Module in Materials Science and Materials
    Engineering, Elsevier, 2022.'
date_created: 2022-09-30T09:35:16Z
date_updated: 2022-09-30T09:41:47Z
department:
- _id: '151'
doi: 10.1016/b978-0-12-819728-8.00047-4
keyword:
- Equivalent circuit model
- Langevin transducer
- Lumped parameter model
- Piezoelectric transducer
- Ultrasonic processes
- Ultrasound
language:
- iso: eng
main_file_link:
- url: https://www.sciencedirect.com/science/article/pii/B9780128197288000474
publication: Reference Module in Materials Science and Materials Engineering
publication_identifier:
  isbn:
  - 978-0-12-803581-8
publication_status: published
publisher: Elsevier
quality_controlled: '1'
status: public
title: Piezoelectric Ultrasonic Power Transducers
type: book_chapter
user_id: '210'
year: '2022'
...
---
_id: '52045'
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. <i>Modellbasierte Ermittlung optimaler Prozessparameter
    für neuartige Ultraschallbondverbindungen</i>. LibreCat University; 2022. doi:<a
    href="https://doi.org/10.2314/KXP:1879655276">10.2314/KXP:1879655276</a>
  apa: Scheidemann, C., Hemsel, T., &#38; Sextro, W. (2022). <i>Modellbasierte Ermittlung
    optimaler Prozessparameter für neuartige Ultraschallbondverbindungen</i>. LibreCat
    University. <a href="https://doi.org/10.2314/KXP:1879655276">https://doi.org/10.2314/KXP:1879655276</a>
  bibtex: '@book{Scheidemann_Hemsel_Sextro_2022, title={Modellbasierte Ermittlung
    optimaler Prozessparameter für neuartige Ultraschallbondverbindungen}, DOI={<a
    href="https://doi.org/10.2314/KXP:1879655276">10.2314/KXP:1879655276</a>}, publisher={LibreCat
    University}, author={Scheidemann, Claus and Hemsel, Tobias and Sextro, Walter},
    year={2022} }'
  chicago: Scheidemann, Claus, Tobias Hemsel, and Walter Sextro. <i>Modellbasierte
    Ermittlung optimaler Prozessparameter für neuartige Ultraschallbondverbindungen</i>.
    LibreCat University, 2022. <a href="https://doi.org/10.2314/KXP:1879655276">https://doi.org/10.2314/KXP:1879655276</a>.
  ieee: C. Scheidemann, T. Hemsel, and W. Sextro, <i>Modellbasierte Ermittlung optimaler
    Prozessparameter für neuartige Ultraschallbondverbindungen</i>. LibreCat University,
    2022.
  mla: Scheidemann, Claus, et al. <i>Modellbasierte Ermittlung optimaler Prozessparameter
    für neuartige Ultraschallbondverbindungen</i>. LibreCat University, 2022, doi:<a
    href="https://doi.org/10.2314/KXP:1879655276">10.2314/KXP:1879655276</a>.
  short: C. Scheidemann, T. Hemsel, W. Sextro, Modellbasierte Ermittlung optimaler
    Prozessparameter für neuartige Ultraschallbondverbindungen, LibreCat University,
    2022.
date_created: 2024-02-26T21:26:35Z
date_updated: 2024-02-26T21:35:03Z
department:
- _id: '151'
doi: 10.2314/KXP:1879655276
language:
- iso: ger
publisher: LibreCat University
related_material:
  link:
  - relation: confirmation
    url: https://www.tib.eu/de/suchen?tx_tibsearch_search%5Baction%5D=download&tx_tibsearch_search%5Bcontroller%5D=Download&tx_tibsearch_search%5Bdocid%5D=TIBKAT%3A1879655276&cHash=bf2cba5ff8f46a376ce5ef59242c95e2#download-mark
status: public
title: Modellbasierte Ermittlung optimaler Prozessparameter für neuartige Ultraschallbondverbindungen
type: report
user_id: '38259'
year: '2022'
...