---
_id: '61140'
article_number: '107799'
author:
- first_name: Marcel
full_name: Nicolai, Marcel
last_name: Nicolai
- first_name: Jannis
full_name: Bulling, Jannis
last_name: Bulling
- first_name: M.M.
full_name: Narayanan, M.M.
last_name: Narayanan
- first_name: Henning
full_name: Zeipert, Henning
id: '32580'
last_name: Zeipert
- first_name: Jens
full_name: Prager, Jens
last_name: Prager
- first_name: Bernd
full_name: Henning, Bernd
id: '213'
last_name: Henning
citation:
ama: 'Nicolai M, Bulling J, Narayanan MM, Zeipert H, Prager J, Henning B. Dynamic
interface behavior in coupled plates: Investigating Lamb wave mode repulsion with
a spring-based model. Ultrasonics. 2025;158. doi:10.1016/j.ultras.2025.107799'
apa: 'Nicolai, M., Bulling, J., Narayanan, M. M., Zeipert, H., Prager, J., &
Henning, B. (2025). Dynamic interface behavior in coupled plates: Investigating
Lamb wave mode repulsion with a spring-based model. Ultrasonics, 158,
Article 107799. https://doi.org/10.1016/j.ultras.2025.107799'
bibtex: '@article{Nicolai_Bulling_Narayanan_Zeipert_Prager_Henning_2025, title={Dynamic
interface behavior in coupled plates: Investigating Lamb wave mode repulsion with
a spring-based model}, volume={158}, DOI={10.1016/j.ultras.2025.107799},
number={107799}, journal={Ultrasonics}, publisher={Elsevier BV}, author={Nicolai,
Marcel and Bulling, Jannis and Narayanan, M.M. and Zeipert, Henning and Prager,
Jens and Henning, Bernd}, year={2025} }'
chicago: 'Nicolai, Marcel, Jannis Bulling, M.M. Narayanan, Henning Zeipert, Jens
Prager, and Bernd Henning. “Dynamic Interface Behavior in Coupled Plates: Investigating
Lamb Wave Mode Repulsion with a Spring-Based Model.” Ultrasonics 158 (2025).
https://doi.org/10.1016/j.ultras.2025.107799.'
ieee: 'M. Nicolai, J. Bulling, M. M. Narayanan, H. Zeipert, J. Prager, and B. Henning,
“Dynamic interface behavior in coupled plates: Investigating Lamb wave mode repulsion
with a spring-based model,” Ultrasonics, vol. 158, Art. no. 107799, 2025,
doi: 10.1016/j.ultras.2025.107799.'
mla: 'Nicolai, Marcel, et al. “Dynamic Interface Behavior in Coupled Plates: Investigating
Lamb Wave Mode Repulsion with a Spring-Based Model.” Ultrasonics, vol.
158, 107799, Elsevier BV, 2025, doi:10.1016/j.ultras.2025.107799.'
short: M. Nicolai, J. Bulling, M.M. Narayanan, H. Zeipert, J. Prager, B. Henning,
Ultrasonics 158 (2025).
date_created: 2025-09-08T06:50:08Z
date_updated: 2025-09-08T06:51:16Z
department:
- _id: '49'
doi: 10.1016/j.ultras.2025.107799
intvolume: ' 158'
language:
- iso: eng
project:
- _id: '105'
name: Vermiedene Kreuzungen von Lamb-Wellenmoden in mehrlagigen Strukturen
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
publication_status: published
publisher: Elsevier BV
status: public
title: 'Dynamic interface behavior in coupled plates: Investigating Lamb wave mode
repulsion with a spring-based model'
type: journal_article
user_id: '32580'
volume: 158
year: '2025'
...
---
_id: '21232'
article_number: '106389'
author:
- first_name: Dominik
full_name: Itner, Dominik
last_name: Itner
- first_name: Hauke
full_name: Gravenkamp, Hauke
last_name: Gravenkamp
- first_name: Dmitrij
full_name: Dreiling, Dmitrij
id: '32616'
last_name: Dreiling
- first_name: Nadine
full_name: Feldmann, Nadine
id: '23082'
last_name: Feldmann
- first_name: Bernd
full_name: Henning, Bernd
id: '213'
last_name: Henning
citation:
ama: Itner D, Gravenkamp H, Dreiling D, Feldmann N, Henning B. Efficient semi-analytical
simulation of elastic guided waves in cylinders subject to arbitrary non-symmetric
loads. Ultrasonics. Published online 2021. doi:10.1016/j.ultras.2021.106389
apa: Itner, D., Gravenkamp, H., Dreiling, D., Feldmann, N., & Henning, B. (2021).
Efficient semi-analytical simulation of elastic guided waves in cylinders subject
to arbitrary non-symmetric loads. Ultrasonics, Article 106389. https://doi.org/10.1016/j.ultras.2021.106389
bibtex: '@article{Itner_Gravenkamp_Dreiling_Feldmann_Henning_2021, title={Efficient
semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary
non-symmetric loads}, DOI={10.1016/j.ultras.2021.106389},
number={106389}, journal={Ultrasonics}, author={Itner, Dominik and Gravenkamp,
Hauke and Dreiling, Dmitrij and Feldmann, Nadine and Henning, Bernd}, year={2021}
}'
chicago: Itner, Dominik, Hauke Gravenkamp, Dmitrij Dreiling, Nadine Feldmann, and
Bernd Henning. “Efficient Semi-Analytical Simulation of Elastic Guided Waves in
Cylinders Subject to Arbitrary Non-Symmetric Loads.” Ultrasonics, 2021.
https://doi.org/10.1016/j.ultras.2021.106389.
ieee: 'D. Itner, H. Gravenkamp, D. Dreiling, N. Feldmann, and B. Henning, “Efficient
semi-analytical simulation of elastic guided waves in cylinders subject to arbitrary
non-symmetric loads,” Ultrasonics, Art. no. 106389, 2021, doi: 10.1016/j.ultras.2021.106389.'
mla: Itner, Dominik, et al. “Efficient Semi-Analytical Simulation of Elastic Guided
Waves in Cylinders Subject to Arbitrary Non-Symmetric Loads.” Ultrasonics,
106389, 2021, doi:10.1016/j.ultras.2021.106389.
short: D. Itner, H. Gravenkamp, D. Dreiling, N. Feldmann, B. Henning, Ultrasonics
(2021).
date_created: 2021-02-15T09:53:32Z
date_updated: 2023-09-25T08:09:24Z
department:
- _id: '49'
doi: 10.1016/j.ultras.2021.106389
language:
- iso: eng
project:
- _id: '89'
grant_number: '409779252'
name: Vollständige Bestimmung der akustischen Materialparameter von Polymeren
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
publication_status: published
quality_controlled: '1'
status: public
title: Efficient semi-analytical simulation of elastic guided waves in cylinders subject
to arbitrary non-symmetric loads
type: journal_article
user_id: '32616'
year: '2021'
...
---
_id: '9866'
abstract:
- lang: eng
text: The hydrothermal method utilizes a solution-based chemical reaction to synthesize
piezoelectric thin films and powders. This method has a number of advantages,
such as low-temperature synthesis, and high purity and high quality of the product.
In order to promote hydrothermal reactions, we developed an ultrasonic assisted
hydrothermal method and confirmed that it produces dense and thick lead--zirconate--titanate
(PZT) films. In the hydrothermal method, a crystal growth process follows the
nucleation process. In this study, we verified that ultrasonic irradiation is
effective for the nucleation process, and there is an optimum irradiation period
to obtain thicker PZT films. With this optimization, a 9.2-$\mu$ m-thick PZT polycrystalline
film was obtained in a single deposition process. For this film, ultrasonic irradiation
was carried out from the beginning of the reaction for 18 h, followed by a 6 h
deposition without ultrasonic irradiation. These results indicate that the ultrasonic
irradiation mainly promotes the nucleation process.
author:
- first_name: Kanako
full_name: Ohta, Kanako
last_name: Ohta
- first_name: Gaku
full_name: Isobe, Gaku
last_name: Isobe
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
citation:
ama: Ohta K, Isobe G, Bornmann P, Hemsel T, Morita T. Study on optimizing ultrasonic
irradiation period for thick polycrystalline PZT film by hydrothermal method.
Ultrasonics. 2013;53(4):837-841. doi:10.1016/j.ultras.2012.12.003
apa: Ohta, K., Isobe, G., Bornmann, P., Hemsel, T., & Morita, T. (2013). Study
on optimizing ultrasonic irradiation period for thick polycrystalline PZT film
by hydrothermal method. Ultrasonics, 53(4), 837–841. https://doi.org/10.1016/j.ultras.2012.12.003
bibtex: '@article{Ohta_Isobe_Bornmann_Hemsel_Morita_2013, title={Study on optimizing
ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal
method}, volume={53}, DOI={10.1016/j.ultras.2012.12.003},
number={4}, journal={Ultrasonics}, author={Ohta, Kanako and Isobe, Gaku and Bornmann,
Peter and Hemsel, Tobias and Morita, Takeshi}, year={2013}, pages={837–841} }'
chicago: 'Ohta, Kanako, Gaku Isobe, Peter Bornmann, Tobias Hemsel, and Takeshi Morita.
“Study on Optimizing Ultrasonic Irradiation Period for Thick Polycrystalline PZT
Film by Hydrothermal Method.” Ultrasonics 53, no. 4 (2013): 837–41. https://doi.org/10.1016/j.ultras.2012.12.003.'
ieee: K. Ohta, G. Isobe, P. Bornmann, T. Hemsel, and T. Morita, “Study on optimizing
ultrasonic irradiation period for thick polycrystalline PZT film by hydrothermal
method,” Ultrasonics, vol. 53, no. 4, pp. 837–841, 2013.
mla: Ohta, Kanako, et al. “Study on Optimizing Ultrasonic Irradiation Period for
Thick Polycrystalline PZT Film by Hydrothermal Method.” Ultrasonics, vol.
53, no. 4, 2013, pp. 837–41, doi:10.1016/j.ultras.2012.12.003.
short: K. Ohta, G. Isobe, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics 53 (2013)
837–841.
date_created: 2019-05-20T12:03:07Z
date_updated: 2019-09-16T10:54:27Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2012.12.003
intvolume: ' 53'
issue: '4'
keyword:
- Piezoelectric material
language:
- iso: eng
page: 837 - 841
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Study on optimizing ultrasonic irradiation period for thick polycrystalline
PZT film by hydrothermal method
type: journal_article
user_id: '55222'
volume: 53
year: '2013'
...
---
_id: '9533'
abstract:
- lang: eng
text: 'The design of piezoelectric transducers is usually based on single-objective
optimization only. In most practical applications of piezoelectric transducers,
however, there exist multiple design objectives that often are contradictory to
each other by their very nature. It is impossible to find a solution at which
each objective function gets its optimal value simultaneously. Our design approach
is to first find a set of Pareto-optimal solutions, which can be considered to
be best compromises among multiple design objectives. Among these Pareto-optimal
solutions, the designer can then select the one solution which he considers to
be the best one. In this paper we investigate the optimal design of a Langevin
transducer. The design problem is formulated mathematically as a constrained multiobjective
optimization problem. The maximum vibration amplitude and the minimum electrical
input power are considered as optimization objectives. Design variables involve
continuous variables (dimensions of the transducer) and discrete variables (the
number of piezoelectric rings and material types). In order to formulate the optimization
problem, the behavior of piezoelectric transducers is modeled using the transfer
matrix method based on analytical models. Multiobjective evolutionary algorithms
are applied in the optimization process and a set of Pareto-optimal designs is
calculated. The optimized results are analyzed and the preferred design is determined. '
author:
- first_name: Bo
full_name: Fu, Bo
last_name: Fu
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Jörg
full_name: Wallaschek, Jörg
last_name: Wallaschek
citation:
ama: Fu B, Hemsel T, Wallaschek J. Piezoelectric transducer design via multiobjective
optimization. Ultrasonics. 2006;44, Supplement:e747-e752. doi:10.1016/j.ultras.2006.05.087
apa: Fu, B., Hemsel, T., & Wallaschek, J. (2006). Piezoelectric transducer design
via multiobjective optimization. Ultrasonics, 44, Supplement,
e747–e752. https://doi.org/10.1016/j.ultras.2006.05.087
bibtex: '@article{Fu_Hemsel_Wallaschek_2006, title={Piezoelectric transducer design
via multiobjective optimization}, volume={44, Supplement}, DOI={10.1016/j.ultras.2006.05.087},
journal={Ultrasonics}, author={Fu, Bo and Hemsel, Tobias and Wallaschek, Jörg},
year={2006}, pages={e747–e752} }'
chicago: 'Fu, Bo, Tobias Hemsel, and Jörg Wallaschek. “Piezoelectric Transducer
Design via Multiobjective Optimization.” Ultrasonics 44, Supplement (2006):
e747–52. https://doi.org/10.1016/j.ultras.2006.05.087.'
ieee: B. Fu, T. Hemsel, and J. Wallaschek, “Piezoelectric transducer design via
multiobjective optimization,” Ultrasonics, vol. 44, Supplement, pp. e747–e752,
2006.
mla: Fu, Bo, et al. “Piezoelectric Transducer Design via Multiobjective Optimization.”
Ultrasonics, vol. 44, Supplement, 2006, pp. e747–52, doi:10.1016/j.ultras.2006.05.087.
short: B. Fu, T. Hemsel, J. Wallaschek, Ultrasonics 44, Supplement (2006) e747–e752.
date_created: 2019-04-29T08:50:23Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2006.05.087
keyword:
- Piezoelectric transducer
language:
- iso: eng
page: e747 - e752
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Piezoelectric transducer design via multiobjective optimization
type: journal_article
user_id: '55222'
volume: 44, Supplement
year: '2006'
...
---
_id: '9539'
abstract:
- lang: eng
text: 'Classically, rotary motors with gears and spindle mechanisms are used to
achieve translatory motion. In means of miniaturization and weight reduction piezoelectric
linear motors are of interest. Several ultrasonic linear motors found in literature
base on the use of two different vibration modes. Most often flexural and longitudinal
modes are combined to achieve an elliptic micro-motion of surface points. This
micro-motion is converted to direct linear (or translatory) motion of a driven
slider. To gain high amplitudes of the micro-motion and thus having a powerful
motor, the ultrasonic vibrator should be driven near the eigenfrequency of its
modes. Additionally, low mechanical and electrical losses lead to increased efficiency
and large amplitude magnification in resonance. This demands a geometrical design
that fits the eigenfrequencies of the two different modes. A frequency-deviation
of only a few percent leads to non-acceptable disturbance of the elliptical motion.
Thus, the mechanical design of the vibrators has to be done very carefully. Within
this contribution we discuss different motor designs based on the coupling of
two the same longitudinal vibrations within one structure to generate an elliptic
motion of surface points. Different concepts based on piezoelectric plates and
Langevin transducers are compared. Benefits and drawbacks against the combination
of longitudinal and bending modes will be discussed. Numerical results of the
stator vibration as well as motor characteristics are validated by measurements
on different prototypes. '
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Maik
full_name: Mracek, Maik
last_name: Mracek
- first_name: Jens
full_name: Twiefel, Jens
last_name: Twiefel
- first_name: Piotr
full_name: Vasiljev, Piotr
last_name: Vasiljev
citation:
ama: Hemsel T, Mracek M, Twiefel J, Vasiljev P. Piezoelectric linear motor concepts
based on coupling of longitudinal vibrations. Ultrasonics. 2006;44, Supplement(0):e591-e596.
doi:10.1016/j.ultras.2006.05.056
apa: Hemsel, T., Mracek, M., Twiefel, J., & Vasiljev, P. (2006). Piezoelectric
linear motor concepts based on coupling of longitudinal vibrations. Ultrasonics,
44, Supplement(0), e591–e596. https://doi.org/10.1016/j.ultras.2006.05.056
bibtex: '@article{Hemsel_Mracek_Twiefel_Vasiljev_2006, title={Piezoelectric linear
motor concepts based on coupling of longitudinal vibrations}, volume={44, Supplement},
DOI={10.1016/j.ultras.2006.05.056},
number={0}, journal={Ultrasonics}, author={Hemsel, Tobias and Mracek, Maik and
Twiefel, Jens and Vasiljev, Piotr}, year={2006}, pages={e591–e596} }'
chicago: 'Hemsel, Tobias, Maik Mracek, Jens Twiefel, and Piotr Vasiljev. “Piezoelectric
Linear Motor Concepts Based on Coupling of Longitudinal Vibrations.” Ultrasonics
44, Supplement, no. 0 (2006): e591–96. https://doi.org/10.1016/j.ultras.2006.05.056.'
ieee: T. Hemsel, M. Mracek, J. Twiefel, and P. Vasiljev, “Piezoelectric linear motor
concepts based on coupling of longitudinal vibrations,” Ultrasonics, vol.
44, Supplement, no. 0, pp. e591–e596, 2006.
mla: Hemsel, Tobias, et al. “Piezoelectric Linear Motor Concepts Based on Coupling
of Longitudinal Vibrations.” Ultrasonics, vol. 44, Supplement, no. 0, 2006,
pp. e591–96, doi:10.1016/j.ultras.2006.05.056.
short: T. Hemsel, M. Mracek, J. Twiefel, P. Vasiljev, Ultrasonics 44, Supplement
(2006) e591–e596.
date_created: 2019-04-29T09:03:50Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2006.05.056
issue: '0'
keyword:
- Piezoelectric linear motor
language:
- iso: eng
page: e591 - e596
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Piezoelectric linear motor concepts based on coupling of longitudinal vibrations
type: journal_article
user_id: '55222'
volume: 44, Supplement
year: '2006'
...
---
_id: '9541'
abstract:
- lang: eng
text: Piezoelectric transformers are increasingly getting popular in the electrical
devices owing to several advantages such as small size, high efficiency, no electromagnetic
noise and non-flammable. In addition to the conventional applications such as
ballast for back light inverter in notebook computers, camera flash, and fuel
ignition several new applications have emerged such as AC/DC converter, battery
charger and automobile lighting. These new applications demand high power density
and wide range of voltage gain. Currently, the transformer power density is limited
to $40 W/cm{^3}$ obtained at low voltage gain. The purpose of this study was to
investigate a transformer design that has the potential of providing higher power
density and wider range of voltage gain. The new transformer design utilizes radial
mode both at the input and output port and has the unidirectional polarization
in the ceramics. This design was found to provide 30 W power with an efficiency
of 98\% and 30 $\,^{\circ}$C temperature rise from the room temperature. An electro-mechanical
equivalent circuit model was developed to describe the characteristics of the
piezoelectric transformer. The model was found to successfully predict the characteristics
of the transformer. Excellent matching was found between the computed and experimental
results. The results of this study will allow to deterministically design unipoled
piezoelectric transformers with specified performance. It is expected that in
near future the unipoled transformer will gain significant importance in various
electrical components.
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: S
full_name: Priya, S
last_name: Priya
citation:
ama: Hemsel T, Priya S. Model based analysis of piezoelectric transformers. Ultrasonics.
2006;44, Supplement(0):e741-e745. doi:10.1016/j.ultras.2006.05.086
apa: Hemsel, T., & Priya, S. (2006). Model based analysis of piezoelectric transformers.
Ultrasonics, 44, Supplement(0), e741–e745. https://doi.org/10.1016/j.ultras.2006.05.086
bibtex: '@article{Hemsel_Priya_2006, title={Model based analysis of piezoelectric
transformers}, volume={44, Supplement}, DOI={10.1016/j.ultras.2006.05.086},
number={0}, journal={Ultrasonics}, author={Hemsel, Tobias and Priya, S}, year={2006},
pages={e741–e745} }'
chicago: 'Hemsel, Tobias, and S Priya. “Model Based Analysis of Piezoelectric Transformers.”
Ultrasonics 44, Supplement, no. 0 (2006): e741–45. https://doi.org/10.1016/j.ultras.2006.05.086.'
ieee: T. Hemsel and S. Priya, “Model based analysis of piezoelectric transformers,”
Ultrasonics, vol. 44, Supplement, no. 0, pp. e741–e745, 2006.
mla: Hemsel, Tobias, and S. Priya. “Model Based Analysis of Piezoelectric Transformers.”
Ultrasonics, vol. 44, Supplement, no. 0, 2006, pp. e741–45, doi:10.1016/j.ultras.2006.05.086.
short: T. Hemsel, S. Priya, Ultrasonics 44, Supplement (2006) e741–e745.
date_created: 2019-04-29T09:22:21Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2006.05.086
issue: '0'
keyword:
- Piezoelectric transformers
language:
- iso: eng
page: e741 - e745
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Model based analysis of piezoelectric transformers
type: journal_article
user_id: '55222'
volume: 44, Supplement
year: '2006'
...
---
_id: '9543'
abstract:
- lang: eng
text: An improved concept for ultrasonic hyperthermia of tumors is presented. This
concept is based on past experience of a German government supported project [1],
which ended in 1984. It offers a low cost alternative to common RF- and microwave
methods for hyperthermia of tumors with volumes between 1 and 40 ml at treatment
times between 30 and 60 min. Our new version of the system considerably improves
the temperature suppression in the healthy tissue around the target area and enables
the adjustment of the beam width to the actual tumor size and the field geometry
to the depth and shape of the tumor. The applicator can be used for moderate hyperthermia
with tissue overheating up to 10 K or for ablation therapy with short high temperature
pulses. Its central area is free for the integration of a commercial ultrasonic
diagnostic sector scanner or a Doppler flow sensor in order to support the adjustment
of the transducer and to monitor the whole area during the therapy.
author:
- first_name: E.G.
full_name: Lierke, E.G.
last_name: Lierke
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Lierke EG, Hemsel T. Focusing cross-fire applicator for ultrasonic hyperthermia
of tumors. Ultrasonics. 2006;44, Supplement:e341-e344. doi:10.1016/j.ultras.2006.07.004
apa: Lierke, E. G., & Hemsel, T. (2006). Focusing cross-fire applicator for
ultrasonic hyperthermia of tumors. Ultrasonics, 44, Supplement,
e341–e344. https://doi.org/10.1016/j.ultras.2006.07.004
bibtex: '@article{Lierke_Hemsel_2006, title={Focusing cross-fire applicator for
ultrasonic hyperthermia of tumors}, volume={44, Supplement}, DOI={10.1016/j.ultras.2006.07.004},
journal={Ultrasonics}, author={Lierke, E.G. and Hemsel, Tobias}, year={2006},
pages={e341–e344} }'
chicago: 'Lierke, E.G., and Tobias Hemsel. “Focusing Cross-Fire Applicator for Ultrasonic
Hyperthermia of Tumors.” Ultrasonics 44, Supplement (2006): e341–44. https://doi.org/10.1016/j.ultras.2006.07.004.'
ieee: E. G. Lierke and T. Hemsel, “Focusing cross-fire applicator for ultrasonic
hyperthermia of tumors,” Ultrasonics, vol. 44, Supplement, pp. e341–e344,
2006.
mla: Lierke, E. G., and Tobias Hemsel. “Focusing Cross-Fire Applicator for Ultrasonic
Hyperthermia of Tumors.” Ultrasonics, vol. 44, Supplement, 2006, pp. e341–44,
doi:10.1016/j.ultras.2006.07.004.
short: E.G. Lierke, T. Hemsel, Ultrasonics 44, Supplement (2006) e341–e344.
date_created: 2019-04-29T09:27:27Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2006.07.004
keyword:
- Moderate hyperthermia
language:
- iso: eng
page: e341 - e344
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Focusing cross-fire applicator for ultrasonic hyperthermia of tumors
type: journal_article
user_id: '55222'
volume: 44, Supplement
year: '2006'
...
---
_id: '9546'
abstract:
- lang: eng
text: Rotary ultrasonic motors have found broad industrial application in camera
lens drives and other systems. Linear ultrasonic motors in contrast have only
found limited applications. The main reason for the limited range of application
of these very attractive devices seems to be their small force and power range.
Attempts to build linear ultrasonic motors for high forces and high power applications
have not been truly successful yet. To achieve larger force and higher power,
multiple miniaturized motors can be combined. This approach, however, is not as
simple as it appears at first glance. The electromechanical behaviour of the individual
motors differs slightly due to manufacturing and assembly tolerances. The individual
motor characteristics are strongly dependent on the driving parameters (frequency,
voltage, temperature, pre-stress, etc.) and the driven load and the collective
behaviour of the swarm of motors is not just the linear superposition of the individual
drive's forces. Thus, the bundle of motors has to be synchronized and controlled
appropriately in order to obtain an optimized drive that is not oversized and
costly. We have investigated driving and control strategies of a set of linear
ultrasonic motors. Our contribution will be divided into three main parts. In
part I ultrasonic linear motors will be introduced. In part II driving strategies
for a single motor as well as for a bundle of motors will be presented. These
concepts will be verified by simulation results and experimental data. In part
III a simplified model for the motor's electromechanical behaviour will be given.
author:
- first_name: Maik
full_name: Mracek, Maik
last_name: Mracek
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
citation:
ama: Mracek M, Hemsel T. Synergetic driving concepts for bundled miniature ultrasonic
linear motors. Ultrasonics. 2006;44, Supplement:e597-e602. doi:10.1016/j.ultras.2006.05.201
apa: Mracek, M., & Hemsel, T. (2006). Synergetic driving concepts for bundled
miniature ultrasonic linear motors. Ultrasonics, 44, Supplement,
e597–e602. https://doi.org/10.1016/j.ultras.2006.05.201
bibtex: '@article{Mracek_Hemsel_2006, title={Synergetic driving concepts for bundled
miniature ultrasonic linear motors}, volume={44, Supplement}, DOI={10.1016/j.ultras.2006.05.201},
journal={Ultrasonics}, author={Mracek, Maik and Hemsel, Tobias}, year={2006},
pages={e597–e602} }'
chicago: 'Mracek, Maik, and Tobias Hemsel. “Synergetic Driving Concepts for Bundled
Miniature Ultrasonic Linear Motors.” Ultrasonics 44, Supplement (2006):
e597–602. https://doi.org/10.1016/j.ultras.2006.05.201.'
ieee: M. Mracek and T. Hemsel, “Synergetic driving concepts for bundled miniature
ultrasonic linear motors,” Ultrasonics, vol. 44, Supplement, pp. e597–e602,
2006.
mla: Mracek, Maik, and Tobias Hemsel. “Synergetic Driving Concepts for Bundled Miniature
Ultrasonic Linear Motors.” Ultrasonics, vol. 44, Supplement, 2006, pp.
e597–602, doi:10.1016/j.ultras.2006.05.201.
short: M. Mracek, T. Hemsel, Ultrasonics 44, Supplement (2006) e597–e602.
date_created: 2019-04-29T09:34:16Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
doi: 10.1016/j.ultras.2006.05.201
keyword:
- Ultrasonic linear motor
language:
- iso: eng
page: e597 - e602
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Synergetic driving concepts for bundled miniature ultrasonic linear motors
type: journal_article
user_id: '55222'
volume: 44, Supplement
year: '2006'
...
---
_id: '8914'
abstract:
- lang: eng
text: 'Piezoelectric ultrasonic motors have been investigated for several years
and have already found their first practical applications. Their key feature is
that they are able to produce a high thrust force related to their volume. Beside
rotary drives like the travelling wave motor, linear drives have also been developed,
but only a few are presently commercially available. In the present paper, we
first describe the state of the art of linear piezoelectric motors. The motors
are characterized with respect to their no-load velocity, maximum thrust force,
efficiency and other technical properties. In the second part, we present a new
motor, which is judged to be capable of surpassing the characteristics of other
piezoelectric motors because of its unique design which allows the piezoelectric
drive elements to be pre-stressed in the direction of their polarization. The
piezoelectric elements convert energy using the longitudinal d33 effect which
allows an improved reliability, large vibration amplitudes and excellent piezoelectric
coupling. Energy loss by vibration damping is minimized, and the efficiency can
be improved significantly. Experimental results show that the motor characteristics
can be optimized for a particular task by choosing the appropriate operating parameters
such as exciting voltage, exciting frequency and normal force. '
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Jörg
full_name: Wallaschek, Jörg
last_name: Wallaschek
citation:
ama: Hemsel T, Wallaschek J. Survey of the present state of the art of piezoelectric
linear motors. Ultrasonics. 2000;38:37-40. doi:10.1016/S0041-624X(99)00143-2
apa: Hemsel, T., & Wallaschek, J. (2000). Survey of the present state of the
art of piezoelectric linear motors. Ultrasonics, 38, 37–40. https://doi.org/10.1016/S0041-624X(99)00143-2
bibtex: '@article{Hemsel_Wallaschek_2000, title={Survey of the present state of
the art of piezoelectric linear motors}, volume={38}, DOI={10.1016/S0041-624X(99)00143-2},
journal={Ultrasonics}, author={Hemsel, Tobias and Wallaschek, Jörg}, year={2000},
pages={37–40} }'
chicago: 'Hemsel, Tobias, and Jörg Wallaschek. “Survey of the Present State of the
Art of Piezoelectric Linear Motors.” Ultrasonics 38 (2000): 37–40. https://doi.org/10.1016/S0041-624X(99)00143-2.'
ieee: T. Hemsel and J. Wallaschek, “Survey of the present state of the art of piezoelectric
linear motors,” Ultrasonics, vol. 38, pp. 37–40, 2000.
mla: Hemsel, Tobias, and Jörg Wallaschek. “Survey of the Present State of the Art
of Piezoelectric Linear Motors.” Ultrasonics, vol. 38, 2000, pp. 37–40,
doi:10.1016/S0041-624X(99)00143-2.
short: T. Hemsel, J. Wallaschek, Ultrasonics 38 (2000) 37–40.
date_created: 2019-04-15T09:42:32Z
date_updated: 2022-01-06T07:04:05Z
department:
- _id: '151'
doi: 10.1016/S0041-624X(99)00143-2
intvolume: ' 38'
keyword:
- Linear motor
language:
- iso: eng
page: 37 - 40
publication: Ultrasonics
publication_identifier:
issn:
- 0041-624X
quality_controlled: '1'
status: public
title: Survey of the present state of the art of piezoelectric linear motors
type: journal_article
user_id: '55222'
volume: 38
year: '2000'
...