---
_id: '9948'
author:
- first_name: Ryo
full_name: Kudo, Ryo
last_name: Kudo
- 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: Kudo R, Bornmann P, Hemsel T, Morita T. Thick KNbO 3 films deposited by ultrasonic-assisted
hydrothermal method. Acoustical Science and Technology. 2015;36(3):262-264.
doi:10.1250/ast.36.262
apa: Kudo, R., Bornmann, P., Hemsel, T., & Morita, T. (2015). Thick KNbO 3 films
deposited by ultrasonic-assisted hydrothermal method. Acoustical Science and
Technology, 36(3), 262–264. https://doi.org/10.1250/ast.36.262
bibtex: '@article{Kudo_Bornmann_Hemsel_Morita_2015, title={Thick KNbO 3 films deposited
by ultrasonic-assisted hydrothermal method}, volume={36}, DOI={10.1250/ast.36.262},
number={3}, journal={Acoustical Science and Technology}, publisher={Acoustical
Society of Japan}, author={Kudo, Ryo and Bornmann, Peter and Hemsel, Tobias and
Morita, Takeshi}, year={2015}, pages={262–264} }'
chicago: 'Kudo, Ryo, Peter Bornmann, Tobias Hemsel, and Takeshi Morita. “Thick KNbO
3 Films Deposited by Ultrasonic-Assisted Hydrothermal Method.” Acoustical Science
and Technology 36, no. 3 (2015): 262–64. https://doi.org/10.1250/ast.36.262.'
ieee: R. Kudo, P. Bornmann, T. Hemsel, and T. Morita, “Thick KNbO 3 films deposited
by ultrasonic-assisted hydrothermal method,” Acoustical Science and Technology,
vol. 36, no. 3, pp. 262–264, 2015.
mla: Kudo, Ryo, et al. “Thick KNbO 3 Films Deposited by Ultrasonic-Assisted Hydrothermal
Method.” Acoustical Science and Technology, vol. 36, no. 3, Acoustical
Society of Japan, 2015, pp. 262–64, doi:10.1250/ast.36.262.
short: R. Kudo, P. Bornmann, T. Hemsel, T. Morita, Acoustical Science and Technology
36 (2015) 262–264.
date_created: 2019-05-27T08:28:31Z
date_updated: 2019-09-16T10:51:23Z
department:
- _id: '151'
doi: 10.1250/ast.36.262
intvolume: ' 36'
issue: '3'
language:
- iso: eng
page: 262-264
publication: Acoustical Science and Technology
publisher: Acoustical Society of Japan
quality_controlled: '1'
status: public
title: Thick KNbO 3 films deposited by ultrasonic-assisted hydrothermal method
type: journal_article
user_id: '55222'
volume: 36
year: '2015'
...
---
_id: '9868'
abstract:
- lang: eng
text: In order to increase mechanical strength, heat dissipation and ampacity and
to decrease failure through fatigue fracture, wedge copper wire bonding is being
introduced as a standard interconnection method for mass production. To achieve
the same process stability when using copper wire instead of aluminum wire a profound
understanding of the bonding process is needed. Due to the higher hardness of
copper compared to aluminum wire it is more difficult to approach the surfaces
of wire and substrate to a level where van der Waals forces are able to arise
between atoms. Also, enough friction energy referred to the total contact area
has to be generated to activate the surfaces. Therefore, a friction model is used
to simulate the joining process. This model calculates the resulting energy of
partial areas in the contact surface and provides information about the adhesion
process of each area. The focus here is on the arising of micro joints in the
contact area depending on the location in the contact and time. To validate the
model, different touchdown forces are used to vary the initial contact areas of
wire and substrate. Additionally, a piezoelectric tri-axial force sensor is built
up to identify the known phases of pre-deforming, cleaning, adhering and diffusing
for the real bonding process to map with the model. Test substrates as DBC and
copper plate are used to show the different formations of a wedge bond connection
due to hardness and reaction propensity. The experiments were done by using 500
$\mu$m copper wire and a standard V-groove tool.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- 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: 'Althoff S, Neuhaus J, Hemsel T, Sextro W. Improving the bond quality of copper
wire bonds using a friction model approach. In: Electronic Components and Technology
Conference (ECTC), 2014 IEEE 64th. ; 2014:1549-1555. doi:10.1109/ECTC.2014.6897500'
apa: Althoff, S., Neuhaus, J., Hemsel, T., & Sextro, W. (2014). Improving the
bond quality of copper wire bonds using a friction model approach. In Electronic
Components and Technology Conference (ECTC), 2014 IEEE 64th (pp. 1549–1555).
https://doi.org/10.1109/ECTC.2014.6897500
bibtex: '@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2014, title={Improving the
bond quality of copper wire bonds using a friction model approach}, DOI={10.1109/ECTC.2014.6897500},
booktitle={Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th},
author={Althoff, Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter},
year={2014}, pages={1549–1555} }'
chicago: Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “Improving
the Bond Quality of Copper Wire Bonds Using a Friction Model Approach.” In Electronic
Components and Technology Conference (ECTC), 2014 IEEE 64th, 1549–55, 2014.
https://doi.org/10.1109/ECTC.2014.6897500.
ieee: S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “Improving the bond quality
of copper wire bonds using a friction model approach,” in Electronic Components
and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.
mla: Althoff, Simon, et al. “Improving the Bond Quality of Copper Wire Bonds Using
a Friction Model Approach.” Electronic Components and Technology Conference
(ECTC), 2014 IEEE 64th, 2014, pp. 1549–55, doi:10.1109/ECTC.2014.6897500.
short: 'S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: Electronic Components
and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.'
date_created: 2019-05-20T12:11:44Z
date_updated: 2019-09-16T10:57:58Z
department:
- _id: '151'
doi: 10.1109/ECTC.2014.6897500
keyword:
- adhesion
- circuit reliability
- deformation
- diffusion
- fatigue cracks
- friction
- interconnections
- lead bonding
- van der Waals forces
- Cu
- adhering process
- adhesion process
- ampacity improvement
- bond quality improvement
- cleaning process
- diffusing process
- fatigue fracture failure
- friction energy
- friction model
- heat dissipation
- mechanical strength
- piezoelectric triaxial force sensor
- predeforming process
- size 500 mum
- total contact area
- van der Waals forces
- wedge copper wire bonding
- Bonding
- Copper
- Finite element analysis
- Force
- Friction
- Substrates
- Wires
language:
- iso: eng
page: 1549-1555
publication: Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th
quality_controlled: '1'
status: public
title: Improving the bond quality of copper wire bonds using a friction model approach
type: conference
user_id: '55222'
year: '2014'
...
---
_id: '9869'
abstract:
- lang: eng
text: Cavitation monitoring is desired to optimize the sonication for diverse sonochemical
processes and to detect changes or malfunctions during operation. In situ cavitation
measurements can be carried out by detection of the acoustic emissions of cavitation
bubbles by sensors in the liquid. However, in harsh environments sensors might
not be applicable. Thus, the impact of cavitation on the electrical signals of
a piezoelectric transducer has been analyzed as alternative method to measure
the threshold, strength and type of cavitation. The applicability has been tested
in three different setups to evaluate the general- izability of extracted indicators.
In all setups indicators for the cavitation thresholds could be derived from the
current signal. In two setups features showed two thresholds that may be linked
to the types of cavitation. However, only one feature derived from the current
signal in one particular setup correlated to the strength of cavitation. Cavitation
detection based on the current signal of the transducer is a useful method to
detect cavitation in harsh environments and without perturbing the sound field.
Once appli- cable indicators have been identified, they may easily be tracked
during the process. However, for more detailed studies about the cavitation activity
and its spatial distribution, measurements with in situ sensors are recommended.
author:
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Gianluca
full_name: Memoli, Gianluca
last_name: Memoli
- first_name: Mark
full_name: Hodnett, Mark
last_name: Hodnett
- first_name: Bajram
full_name: Zeqiri, Bajram
last_name: Zeqiri
citation:
ama: 'Bornmann P, Hemsel T, Sextro W, Memoli G, Hodnett M, Zeqiri B. Self-Sensing
Ultrasound Transducer for Cavitation Detection. In: 2014 IEEE International
Ultrasonics Symposium Proceedings. ; 2014:663-666. doi:10.1109/ULTSYM.2014.0163'
apa: Bornmann, P., Hemsel, T., Sextro, W., Memoli, G., Hodnett, M., & Zeqiri,
B. (2014). Self-Sensing Ultrasound Transducer for Cavitation Detection. In 2014
IEEE International Ultrasonics Symposium Proceedings (pp. 663–666). https://doi.org/10.1109/ULTSYM.2014.0163
bibtex: '@inproceedings{Bornmann_Hemsel_Sextro_Memoli_Hodnett_Zeqiri_2014, title={Self-Sensing
Ultrasound Transducer for Cavitation Detection}, DOI={10.1109/ULTSYM.2014.0163},
booktitle={2014 IEEE International Ultrasonics Symposium Proceedings}, author={Bornmann,
Peter and Hemsel, Tobias and Sextro, Walter and Memoli, Gianluca and Hodnett,
Mark and Zeqiri, Bajram}, year={2014}, pages={663–666} }'
chicago: Bornmann, Peter, Tobias Hemsel, Walter Sextro, Gianluca Memoli, Mark Hodnett,
and Bajram Zeqiri. “Self-Sensing Ultrasound Transducer for Cavitation Detection.”
In 2014 IEEE International Ultrasonics Symposium Proceedings, 663–66, 2014.
https://doi.org/10.1109/ULTSYM.2014.0163.
ieee: P. Bornmann, T. Hemsel, W. Sextro, G. Memoli, M. Hodnett, and B. Zeqiri, “Self-Sensing
Ultrasound Transducer for Cavitation Detection,” in 2014 IEEE International
Ultrasonics Symposium Proceedings, 2014, pp. 663–666.
mla: Bornmann, Peter, et al. “Self-Sensing Ultrasound Transducer for Cavitation
Detection.” 2014 IEEE International Ultrasonics Symposium Proceedings,
2014, pp. 663–66, doi:10.1109/ULTSYM.2014.0163.
short: 'P. Bornmann, T. Hemsel, W. Sextro, G. Memoli, M. Hodnett, B. Zeqiri, in:
2014 IEEE International Ultrasonics Symposium Proceedings, 2014, pp. 663–666.'
date_created: 2019-05-20T12:13:02Z
date_updated: 2019-05-20T12:13:41Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2014.0163
language:
- iso: eng
page: 663-666
publication: 2014 IEEE International Ultrasonics Symposium Proceedings
publication_identifier:
isbn:
- '9781479970490'
status: public
title: Self-Sensing Ultrasound Transducer for Cavitation Detection
type: conference
user_id: '55222'
year: '2014'
...
---
_id: '9874'
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Peter
full_name: Bornmann, Peter
last_name: Bornmann
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
- first_name: Christoph
full_name: Sondermann-Wölke, Christoph
last_name: Sondermann-Wölke
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Hemsel T, Bornmann P, Morita T, Sondermann-Wölke C, Sextro W. Reliability analysis
of ultrasonic power transducers. Archive of Applied Mechanics. 2014:1-7.
doi:10.1007/s00419-014-0965-4
apa: Hemsel, T., Bornmann, P., Morita, T., Sondermann-Wölke, C., & Sextro, W.
(2014). Reliability analysis of ultrasonic power transducers. Archive of Applied
Mechanics, 1–7. https://doi.org/10.1007/s00419-014-0965-4
bibtex: '@article{Hemsel_Bornmann_Morita_Sondermann-Wölke_Sextro_2014, title={Reliability
analysis of ultrasonic power transducers}, DOI={10.1007/s00419-014-0965-4},
journal={Archive of Applied Mechanics}, publisher={Springer Berlin Heidelberg},
author={Hemsel, Tobias and Bornmann, Peter and Morita, Takeshi and Sondermann-Wölke,
Christoph and Sextro, Walter}, year={2014}, pages={1–7} }'
chicago: Hemsel, Tobias, Peter Bornmann, Takeshi Morita, Christoph Sondermann-Wölke,
and Walter Sextro. “Reliability Analysis of Ultrasonic Power Transducers.” Archive
of Applied Mechanics, 2014, 1–7. https://doi.org/10.1007/s00419-014-0965-4.
ieee: T. Hemsel, P. Bornmann, T. Morita, C. Sondermann-Wölke, and W. Sextro, “Reliability
analysis of ultrasonic power transducers,” Archive of Applied Mechanics,
pp. 1–7, 2014.
mla: Hemsel, Tobias, et al. “Reliability Analysis of Ultrasonic Power Transducers.”
Archive of Applied Mechanics, Springer Berlin Heidelberg, 2014, pp. 1–7,
doi:10.1007/s00419-014-0965-4.
short: T. Hemsel, P. Bornmann, T. Morita, C. Sondermann-Wölke, W. Sextro, Archive
of Applied Mechanics (2014) 1–7.
date_created: 2019-05-20T13:01:25Z
date_updated: 2019-09-16T10:57:23Z
department:
- _id: '151'
doi: 10.1007/s00419-014-0965-4
keyword:
- Reliability
- Ultrasonic power transducers
- FMEA
language:
- iso: eng
page: 1-7
publication: Archive of Applied Mechanics
publication_identifier:
issn:
- 0939-1533
publisher: Springer Berlin Heidelberg
quality_controlled: '1'
status: public
title: Reliability analysis of ultrasonic power transducers
type: journal_article
user_id: '55222'
year: '2014'
...
---
_id: '9876'
abstract:
- lang: eng
text: Piezoelectric inertia motors use the inertia of a body to drive it by means
of a friction contact in a series of small steps. It has been shown previously
in theoretical investigations that higher velocities and smoother movements can
be obtained if these steps do not contain phases of stiction (''stick-slip`` operation),
but use sliding friction only (''slip-slip`` operation). One very promising driving
option for such motors is the superposition of multiple sinusoidal signals or
harmonics. In this contribution, the theoretical results are validated experimentally.
In this context, a quick and reliable identification process for parameters describing
the friction contact is proposed. Additionally, the force generation potential
of inertia motors is investigated theoretically and experimentally. The experimental
results confirm the theoretical result that for a given maximum frequency, a signal
with a high fundamental frequency and consisting of two superposed sine waves
leads to the highest velocity and the smoothest motion, while the maximum motor
force is obtained with signals containing more harmonics. These results are of
fundamental importance for the further development of high-velocity piezoelectric
inertia motors.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Hunstig M, Hemsel T, Sextro W. High-velocity operation of piezoelectric inertia
motors: experimental validation. Archive of Applied Mechanics. 2014:1-9.
doi:10.1007/s00419-014-0940-0'
apa: 'Hunstig, M., Hemsel, T., & Sextro, W. (2014). High-velocity operation
of piezoelectric inertia motors: experimental validation. Archive of Applied
Mechanics, 1–9. https://doi.org/10.1007/s00419-014-0940-0'
bibtex: '@article{Hunstig_Hemsel_Sextro_2014, title={High-velocity operation of
piezoelectric inertia motors: experimental validation}, DOI={10.1007/s00419-014-0940-0},
journal={Archive of Applied Mechanics}, publisher={Springer Berlin Heidelberg},
author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2014},
pages={1–9} }'
chicago: 'Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “High-Velocity Operation
of Piezoelectric Inertia Motors: Experimental Validation.” Archive of Applied
Mechanics, 2014, 1–9. https://doi.org/10.1007/s00419-014-0940-0.'
ieee: 'M. Hunstig, T. Hemsel, and W. Sextro, “High-velocity operation of piezoelectric
inertia motors: experimental validation,” Archive of Applied Mechanics,
pp. 1–9, 2014.'
mla: 'Hunstig, Matthias, et al. “High-Velocity Operation of Piezoelectric Inertia
Motors: Experimental Validation.” Archive of Applied Mechanics, Springer
Berlin Heidelberg, 2014, pp. 1–9, doi:10.1007/s00419-014-0940-0.'
short: M. Hunstig, T. Hemsel, W. Sextro, Archive of Applied Mechanics (2014) 1–9.
date_created: 2019-05-20T13:08:08Z
date_updated: 2019-05-20T13:08:43Z
department:
- _id: '151'
doi: 10.1007/s00419-014-0940-0
keyword:
- Inertia motor
- High velocity
- Stick-slip motor
- Slip-slip operation
- Friction parameter identification
language:
- iso: eng
page: 1-9
publication: Archive of Applied Mechanics
publication_identifier:
issn:
- 0939-1533
publisher: Springer Berlin Heidelberg
status: public
title: 'High-velocity operation of piezoelectric inertia motors: experimental validation'
type: journal_article
user_id: '55222'
year: '2014'
...
---
_id: '9878'
abstract:
- lang: eng
text: (K,Na)NbO3 ceramics have attracted much attention as lead-free piezoelectric
materials with high piezoelectric properties. High-quality (K,Na)NbO3 ceramics
can be sintered using KNbO3 and NaNbO3 powders synthesized by a hydrothermal method.
In this study, to enhance the quality factor of the ceramics, high-power ultrasonic
irradiation was employed during the hydrothermal method, which led to a reduction
in the particle size of the resultant powders.
author:
- first_name: G.
full_name: Isobe, G.
last_name: Isobe
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- 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: Isobe G, Maeda T, Bornmann P, Hemsel T, Morita T. Synthesis of lead-free piezoelectric
powders by ultrasonic-assisted hydrothermal method and properties of sintered
(K0.48Na0.52)NBO3 ceramics. Ultrasonics, Ferroelectrics, and Frequency Control,
IEEE Transactions on. 2014;61(2):225-230. doi:10.1109/TUFFC.2014.6722608
apa: Isobe, G., Maeda, T., Bornmann, P., Hemsel, T., & Morita, T. (2014). Synthesis
of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal method
and properties of sintered (K0.48Na0.52)NBO3 ceramics. Ultrasonics, Ferroelectrics,
and Frequency Control, IEEE Transactions On, 61(2), 225–230. https://doi.org/10.1109/TUFFC.2014.6722608
bibtex: '@article{Isobe_Maeda_Bornmann_Hemsel_Morita_2014, title={Synthesis of lead-free
piezoelectric powders by ultrasonic-assisted hydrothermal method and properties
of sintered (K0.48Na0.52)NBO3 ceramics}, volume={61}, DOI={10.1109/TUFFC.2014.6722608},
number={2}, journal={Ultrasonics, Ferroelectrics, and Frequency Control, IEEE
Transactions on}, author={Isobe, G. and Maeda, Takafumi and Bornmann, Peter and
Hemsel, Tobias and Morita, Takeshi}, year={2014}, pages={225–230} }'
chicago: 'Isobe, G., Takafumi Maeda, Peter Bornmann, Tobias Hemsel, and Takeshi
Morita. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted Hydrothermal
Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” Ultrasonics,
Ferroelectrics, and Frequency Control, IEEE Transactions On 61, no. 2 (2014):
225–30. https://doi.org/10.1109/TUFFC.2014.6722608.'
ieee: G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Synthesis of lead-free
piezoelectric powders by ultrasonic-assisted hydrothermal method and properties
of sintered (K0.48Na0.52)NBO3 ceramics,” Ultrasonics, Ferroelectrics, and Frequency
Control, IEEE Transactions on, vol. 61, no. 2, pp. 225–230, 2014.
mla: Isobe, G., et al. “Synthesis of Lead-Free Piezoelectric Powders by Ultrasonic-Assisted
Hydrothermal Method and Properties of Sintered (K0.48Na0.52)NBO3 Ceramics.” Ultrasonics,
Ferroelectrics, and Frequency Control, IEEE Transactions On, vol. 61, no.
2, 2014, pp. 225–30, doi:10.1109/TUFFC.2014.6722608.
short: G. Isobe, T. Maeda, P. Bornmann, T. Hemsel, T. Morita, Ultrasonics, Ferroelectrics,
and Frequency Control, IEEE Transactions On 61 (2014) 225–230.
date_created: 2019-05-20T13:10:14Z
date_updated: 2019-09-16T10:53:17Z
department:
- _id: '151'
doi: 10.1109/TUFFC.2014.6722608
intvolume: ' 61'
issue: '2'
keyword:
- Q-factor
- ceramics
- crystal growth from solution
- particle size
- piezoelectric materials
- potassium compounds
- powders
- sintering
- sodium compounds
- ultrasonic effects
- (K0.48Na0.52)NbO3
- KNbO3 powders
- NaNbO3 powders
- high-power ultrasonic irradiation
- lead-free piezoelectric materials
- lead-free piezoelectric powders
- particle size reduction
- piezoelectric properties
- quality factor
- sintered (K0.48Na0.52)NbO3 ceramics
- sintering
- ultrasonic-assisted hydrothermal method
- Acoustics
- Ceramics
- Lead
- Piezoelectric materials
- Powders
- Radiation effects
- Transducers
language:
- iso: eng
page: 225-230
publication: Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions
on
publication_identifier:
issn:
- 0885-3010
quality_controlled: '1'
status: public
title: Synthesis of lead-free piezoelectric powders by ultrasonic-assisted hydrothermal
method and properties of sintered (K0.48Na0.52)NBO3 ceramics
type: journal_article
user_id: '55222'
volume: 61
year: '2014'
...
---
_id: '9794'
abstract:
- lang: eng
text: 'A piezoelectric cantilever beam with a tip mass at its free end is a common
energy harvester configuration. This article introduces a new principle of designing
such a harvester that increases the generated power without changing the resonance
frequency of the harvester: the attraction force between two permanent magnets
is used to add stiffness to the system. This magnetic stiffening counters the
effect of the tip mass on the efficient operation frequency. Five set-ups incorporating
piezoelectric bimorph cantilevers of the same type in different mechanical configurations
are compared theoretically and experimentally to investigate the feasibility of
this principle: theoretical and experimental results show that magnetically stiffened
harvesters have important advantages over conventional set-ups with and without
tip mass. They generate more power while only slightly increasing the deflection
in the piezoelectric harvester and they can be tuned across a wide range of excitation
frequencies.'
author:
- first_name: Waleed
full_name: Al-Ashtari, Waleed
last_name: Al-Ashtari
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Increasing the power of piezoelectric
energy harvesters by magnetic stiffening. Journal of Intelligent Material Systems
and Structures. 2013;24(11):1332-1342. doi:10.1177/1045389X13483021
apa: Al-Ashtari, W., Hunstig, M., Hemsel, T., & Sextro, W. (2013). Increasing
the power of piezoelectric energy harvesters by magnetic stiffening. Journal
of Intelligent Material Systems and Structures, 24(11), 1332–1342.
https://doi.org/10.1177/1045389X13483021
bibtex: '@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, title={Increasing the power
of piezoelectric energy harvesters by magnetic stiffening}, volume={24}, DOI={10.1177/1045389X13483021},
number={11}, journal={Journal of Intelligent Material Systems and Structures},
author={Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro,
Walter}, year={2013}, pages={1332–1342} }'
chicago: 'Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro.
“Increasing the Power of Piezoelectric Energy Harvesters by Magnetic Stiffening.”
Journal of Intelligent Material Systems and Structures 24, no. 11 (2013):
1332–42. https://doi.org/10.1177/1045389X13483021.'
ieee: W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Increasing the power
of piezoelectric energy harvesters by magnetic stiffening,” Journal of Intelligent
Material Systems and Structures, vol. 24, no. 11, pp. 1332–1342, 2013.
mla: Al-Ashtari, Waleed, et al. “Increasing the Power of Piezoelectric Energy Harvesters
by Magnetic Stiffening.” Journal of Intelligent Material Systems and Structures,
vol. 24, no. 11, 2013, pp. 1332–42, doi:10.1177/1045389X13483021.
short: W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material
Systems and Structures 24 (2013) 1332–1342.
date_created: 2019-05-13T13:51:00Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1177/1045389X13483021
intvolume: ' 24'
issue: '11'
language:
- iso: eng
page: 1332-1342
publication: Journal of Intelligent Material Systems and Structures
status: public
title: Increasing the power of piezoelectric energy harvesters by magnetic stiffening
type: journal_article
user_id: '55222'
volume: 24
year: '2013'
...
---
_id: '9795'
abstract:
- lang: eng
text: Power and bandwidth of piezoelectric harvesters can be increased by using
multiple piezoelectric elements in one harvester. In this contribution, a novel
energy harvesting cantilever array with magnetic tuning including three piezoelectric
bimorphs is investigated theoretically and experimentally, with a good agreement
between model and experiment. Other than harvester designs proposed before, this
array is easy to manufacture and insensitive to manufacturing tolerances because
its optimum operation frequency can be re-adjusted after fabrication. Using the
superposition principle, the Butterworth-Van Dyke model and a mechanical lumped
parameters model, the generated voltage and current are determined analytically.
Formulas for calculating the power generated by array harvesters with an arbitrary
number of piezoelectric elements connected in series or in parallel are derived.
It is shown that optimum harvester design must take both the connected load and
the operating frequency into account. Strategies for connecting multiple bimorphs
to increase the maximum generated power and/or enhance the bandwidth compared
to a single bimorph harvester are investigated. For bandwidth enhancement it is
essential that individual rectifiers are used for the bimorphs. An example with
three bimorphs shows that, depending on the chosen tuning strategy, the power
is increased by about 340\% or the bandwidth is increased by about 500\%, compared
to one single bimorph.
author:
- first_name: Waleed
full_name: Al-Ashtari, Waleed
last_name: Al-Ashtari
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Enhanced energy harvesting using
multiple piezoelectric elements: Theory and experiments. Sensors and Actuators
A: Physical. 2013;200:138-146. doi:10.1016/j.sna.2013.01.008'
apa: 'Al-Ashtari, W., Hunstig, M., Hemsel, T., & Sextro, W. (2013). Enhanced
energy harvesting using multiple piezoelectric elements: Theory and experiments.
Sensors and Actuators A: Physical, 200, 138–146. https://doi.org/10.1016/j.sna.2013.01.008'
bibtex: '@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, title={Enhanced energy
harvesting using multiple piezoelectric elements: Theory and experiments}, volume={200},
DOI={10.1016/j.sna.2013.01.008},
journal={Sensors and Actuators A: Physical}, author={Al-Ashtari, Waleed and Hunstig,
Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={138–146}
}'
chicago: 'Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro.
“Enhanced Energy Harvesting Using Multiple Piezoelectric Elements: Theory and
Experiments.” Sensors and Actuators A: Physical 200 (2013): 138–46. https://doi.org/10.1016/j.sna.2013.01.008.'
ieee: 'W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Enhanced energy harvesting
using multiple piezoelectric elements: Theory and experiments,” Sensors and
Actuators A: Physical, vol. 200, pp. 138–146, 2013.'
mla: 'Al-Ashtari, Waleed, et al. “Enhanced Energy Harvesting Using Multiple Piezoelectric
Elements: Theory and Experiments.” Sensors and Actuators A: Physical, vol.
200, 2013, pp. 138–46, doi:10.1016/j.sna.2013.01.008.'
short: 'W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Sensors and Actuators A:
Physical 200 (2013) 138–146.'
date_created: 2019-05-13T13:51:59Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1016/j.sna.2013.01.008
intvolume: ' 200'
keyword:
- Energy harvesting
- Cantilever array
- Bandwidth
- Power increase
language:
- iso: eng
page: 138 - 146
publication: 'Sensors and Actuators A: Physical'
status: public
title: 'Enhanced energy harvesting using multiple piezoelectric elements: Theory and
experiments'
type: journal_article
user_id: '55222'
volume: 200
year: '2013'
...
---
_id: '9796'
abstract:
- lang: eng
text: 'A basic autonomous system powered by a piezoelectric harvester contains three
components apart from the harvester: a fullwave rectifier, a reservoir capacitor
and an electronic device performing the primary task of the system. In this contribution,
a model describing the operation of such a system is derived. It is found that
in steady-state operation, the piezoelectric harvester experiences two alternating
load conditions due to the rectification process. These alternating load conditions
can have a significant effect on the operation of the harvester and must be considered
in the design of autonomous systems. The results also show that such an autonomous
system works efficiently if it is connected to a high impedance load and excited
by a frequency matching the anti-resonance frequency of the piezoelectric harvester.'
author:
- first_name: Waleed
full_name: Al-Ashtari, Waleed
last_name: Al-Ashtari
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Characteristics of Piezoelectric
Energy Harvesters in Autonomous Systems. In: Proceedings of 10th International
Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting
Workshop, Hannover, Germany, 14.-17.7.2013. Berichte aus dem IDS. Hannover,
Germany; 2013:159-161.'
apa: Al-Ashtari, W., Hunstig, M., Hemsel, T., & Sextro, W. (2013). Characteristics
of Piezoelectric Energy Harvesters in Autonomous Systems. In Proceedings of
10th International Workshop on Piezoelectric Materials and Applications and 8th
Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013 (pp. 159–161).
Hannover, Germany.
bibtex: '@inproceedings{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, place={Hannover,
Germany}, series={Berichte aus dem IDS}, title={Characteristics of Piezoelectric
Energy Harvesters in Autonomous Systems}, number={05/2013}, booktitle={Proceedings
of 10th International Workshop on Piezoelectric Materials and Applications and
8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013}, author={Al-Ashtari,
Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013},
pages={159–161}, collection={Berichte aus dem IDS} }'
chicago: Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro.
“Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems.” In
Proceedings of 10th International Workshop on Piezoelectric Materials and Applications
and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013, 159–61.
Berichte Aus Dem IDS. Hannover, Germany, 2013.
ieee: W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Characteristics of Piezoelectric
Energy Harvesters in Autonomous Systems,” in Proceedings of 10th International
Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting
Workshop, Hannover, Germany, 14.-17.7.2013, 2013, no. 05/2013, pp. 159–161.
mla: Al-Ashtari, Waleed, et al. “Characteristics of Piezoelectric Energy Harvesters
in Autonomous Systems.” Proceedings of 10th International Workshop on Piezoelectric
Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany,
14.-17.7.2013, no. 05/2013, 2013, pp. 159–61.
short: 'W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, in: Proceedings of 10th
International Workshop on Piezoelectric Materials and Applications and 8th Energy
Harvesting Workshop, Hannover, Germany, 14.-17.7.2013, Hannover, Germany, 2013,
pp. 159–161.'
date_created: 2019-05-13T13:53:25Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
issue: 05/2013
keyword:
- Energy harvesting
- harvester modeling
- load dependence
- generated voltage
language:
- iso: eng
page: 159-161
place: Hannover, Germany
publication: Proceedings of 10th International Workshop on Piezoelectric Materials
and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013
quality_controlled: '1'
series_title: Berichte aus dem IDS
status: public
title: Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems
type: conference
user_id: '55222'
year: '2013'
...
---
_id: '9797'
abstract:
- lang: eng
text: A model approach for wedge/wedge bonding copper wire is presented. The connection
between wire and substrate is based on a variety of physical effects, but the
dominant one is the friction based welding while applying ultrasound. Consequently,
a friction model was used to investigate the welding process. This model is built
up universal and can be used to describe the formation of micro welds in the time
variant contact area between wire and substrate. Aim of the model is to identify
the interactions between touchdown, bond normal force, ultrasonic power and bonding
time. To do so, the contact area is discretized into partial areas where a Point
Contact Model is applied. Based on this approach it is possible to simulate micro
and macro slip inside the contact area between wire and substrate. The work done
by friction force is a main criterion to define occurring micro joints which influence
the subsequent welding.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- 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: 'Althoff S, Neuhaus J, Hemsel T, Sextro W. A friction based approach for modeling
wire bonding. In: IMAPS 2013, 46th International Symposium on Microelectronics.
Orlando (Florida), USA; 2013. doi:10.4071/isom-2013-TA67'
apa: Althoff, S., Neuhaus, J., Hemsel, T., & Sextro, W. (2013). A friction based
approach for modeling wire bonding. In IMAPS 2013, 46th International Symposium
on Microelectronics. Orlando (Florida), USA. https://doi.org/10.4071/isom-2013-TA67
bibtex: '@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2013, place={Orlando (Florida),
USA}, title={A friction based approach for modeling wire bonding}, DOI={10.4071/isom-2013-TA67},
booktitle={IMAPS 2013, 46th International Symposium on Microelectronics}, author={Althoff,
Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter}, year={2013} }'
chicago: Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “A Friction
Based Approach for Modeling Wire Bonding.” In IMAPS 2013, 46th International
Symposium on Microelectronics. Orlando (Florida), USA, 2013. https://doi.org/10.4071/isom-2013-TA67.
ieee: S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “A friction based approach
for modeling wire bonding,” in IMAPS 2013, 46th International Symposium on
Microelectronics, 2013.
mla: Althoff, Simon, et al. “A Friction Based Approach for Modeling Wire Bonding.”
IMAPS 2013, 46th International Symposium on Microelectronics, 2013, doi:10.4071/isom-2013-TA67.
short: 'S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: IMAPS 2013, 46th International
Symposium on Microelectronics, Orlando (Florida), USA, 2013.'
date_created: 2019-05-13T13:55:36Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.4071/isom-2013-TA67
keyword:
- Wire bonding
- friction modeling
- wire bond quality
- contact element modeling
language:
- iso: eng
place: Orlando (Florida), USA
publication: IMAPS 2013, 46th International Symposium on Microelectronics
status: public
title: A friction based approach for modeling wire bonding
type: conference
user_id: '55222'
year: '2013'
...
---
_id: '9801'
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Waleed
full_name: Al-Ashtari, Waleed
last_name: Al-Ashtari
- 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: 'Hunstig M, Al-Ashtari W, Hemsel T, Sextro W. Leistungs- und Bandbreitensteigerung
von Energy-Harvesting-Generatoren für Energieautarke Systeme. In: Gausemeier J,
Dumitrescu R, Rammig F, Schäfer W, Trächtler A, eds. 9. Paderborner Workshop
Entwurf Mechatronischer Systeme. HNI-Verlagsschriftenreihe. Paderborn: Heinz
Nixdorf Institut, Universität Paderborn; 2013:359-372.'
apa: 'Hunstig, M., Al-Ashtari, W., Hemsel, T., & Sextro, W. (2013). Leistungs-
und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke
Systeme. In J. Gausemeier, R. Dumitrescu, F. Rammig, W. Schäfer, & A. Trächtler
(Eds.), 9. Paderborner Workshop Entwurf mechatronischer Systeme (pp. 359–372).
Paderborn: Heinz Nixdorf Institut, Universität Paderborn.'
bibtex: '@inproceedings{Hunstig_Al-Ashtari_Hemsel_Sextro_2013, place={Paderborn},
series={HNI-Verlagsschriftenreihe}, title={Leistungs- und Bandbreitensteigerung
von Energy-Harvesting-Generatoren für Energieautarke Systeme}, booktitle={9. Paderborner
Workshop Entwurf mechatronischer Systeme}, publisher={Heinz Nixdorf Institut,
Universität Paderborn}, author={Hunstig, Matthias and Al-Ashtari, Waleed and Hemsel,
Tobias and Sextro, Walter}, editor={Gausemeier, Jürgen and Dumitrescu, Roman and Rammig,
Franz and Schäfer, Wilhelm and Trächtler, AnsgarEditors}, year={2013}, pages={359–372},
collection={HNI-Verlagsschriftenreihe} }'
chicago: 'Hunstig, Matthias, Waleed Al-Ashtari, Tobias Hemsel, and Walter Sextro.
“Leistungs- Und Bandbreitensteigerung von Energy-Harvesting-Generatoren Für Energieautarke
Systeme.” In 9. Paderborner Workshop Entwurf Mechatronischer Systeme, edited
by Jürgen Gausemeier, Roman Dumitrescu, Franz Rammig, Wilhelm Schäfer, and Ansgar
Trächtler, 359–72. HNI-Verlagsschriftenreihe. Paderborn: Heinz Nixdorf Institut,
Universität Paderborn, 2013.'
ieee: M. Hunstig, W. Al-Ashtari, T. Hemsel, and W. Sextro, “Leistungs- und Bandbreitensteigerung
von Energy-Harvesting-Generatoren für Energieautarke Systeme,” in 9. Paderborner
Workshop Entwurf mechatronischer Systeme, 2013, pp. 359–372.
mla: Hunstig, Matthias, et al. “Leistungs- Und Bandbreitensteigerung von Energy-Harvesting-Generatoren
Für Energieautarke Systeme.” 9. Paderborner Workshop Entwurf Mechatronischer
Systeme, edited by Jürgen Gausemeier et al., Heinz Nixdorf Institut, Universität
Paderborn, 2013, pp. 359–72.
short: 'M. Hunstig, W. Al-Ashtari, T. Hemsel, W. Sextro, in: J. Gausemeier, R. Dumitrescu,
F. Rammig, W. Schäfer, A. Trächtler (Eds.), 9. Paderborner Workshop Entwurf Mechatronischer
Systeme, Heinz Nixdorf Institut, Universität Paderborn, Paderborn, 2013, pp. 359–372.'
date_created: 2019-05-13T14:02:10Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
editor:
- first_name: Jürgen
full_name: Gausemeier, Jürgen
last_name: Gausemeier
- first_name: Roman
full_name: Dumitrescu, Roman
last_name: Dumitrescu
- first_name: Franz
full_name: ' Rammig, Franz'
last_name: ' Rammig'
- first_name: Wilhelm
full_name: Schäfer, Wilhelm
last_name: Schäfer
- first_name: Ansgar
full_name: Trächtler, Ansgar
last_name: Trächtler
language:
- iso: eng
page: 359-372
place: Paderborn
publication: 9. Paderborner Workshop Entwurf mechatronischer Systeme
publisher: Heinz Nixdorf Institut, Universität Paderborn
series_title: HNI-Verlagsschriftenreihe
status: public
title: Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für
Energieautarke Systeme
type: conference
user_id: '55222'
year: '2013'
...
---
_id: '9802'
abstract:
- lang: eng
text: It has been shown previously that ``slip-slip'' operation of piezoelectric
inertia motors allows higher velocities and smoother movements than classic ``stick-slip''
operation. One very promising driving option is to use a superposition of multiple
sinusoidal signals. In this contribution, previous theoretical results are validated
experimentally. The results confirm the theoretical result that for a given maximum
frequency, usually defined by the actuator characteristics, a signal with high
fundamental frequency and consisting of two superposed sine waves leads to the
highest velocity and the smoothest motion. This result is of fundamental importance
for the further development of high-velocity piezoelectric inertia motors.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Hunstig M, Hemsel T, Sextro W. High-Velocity Slip-Slip Operation of Piezoelectric
Inertia Motors - Experimental Validation. In: Proceedings of 10th International
Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting
Workshop. Hannover, Germany; 2013:16-18.'
apa: Hunstig, M., Hemsel, T., & Sextro, W. (2013). High-Velocity Slip-Slip Operation
of Piezoelectric Inertia Motors - Experimental Validation. In Proceedings of
10th International Workshop on Piezoelectric Materials and Applications and 8th
Energy Harvesting Workshop (pp. 16–18). Hannover, Germany.
bibtex: '@inproceedings{Hunstig_Hemsel_Sextro_2013, place={Hannover, Germany}, title={High-Velocity
Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation},
booktitle={Proceedings of 10th International Workshop on Piezoelectric Materials
and Applications and 8th Energy Harvesting Workshop}, author={Hunstig, Matthias
and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={16–18} }'
chicago: Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “High-Velocity Slip-Slip
Operation of Piezoelectric Inertia Motors - Experimental Validation.” In Proceedings
of 10th International Workshop on Piezoelectric Materials and Applications and
8th Energy Harvesting Workshop, 16–18. Hannover, Germany, 2013.
ieee: M. Hunstig, T. Hemsel, and W. Sextro, “High-Velocity Slip-Slip Operation of
Piezoelectric Inertia Motors - Experimental Validation,” in Proceedings of
10th International Workshop on Piezoelectric Materials and Applications and 8th
Energy Harvesting Workshop, 2013, pp. 16–18.
mla: Hunstig, Matthias, et al. “High-Velocity Slip-Slip Operation of Piezoelectric
Inertia Motors - Experimental Validation.” Proceedings of 10th International
Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting
Workshop, 2013, pp. 16–18.
short: 'M. Hunstig, T. Hemsel, W. Sextro, in: Proceedings of 10th International
Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting
Workshop, Hannover, Germany, 2013, pp. 16–18.'
date_created: 2019-05-13T14:06:14Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
keyword:
- Piezoelectric inertia motor
- stick-slip motor
- driving signal
- velocity
- smoothness
language:
- iso: eng
page: 16-18
place: Hannover, Germany
publication: Proceedings of 10th International Workshop on Piezoelectric Materials
and Applications and 8th Energy Harvesting Workshop
status: public
title: High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental
Validation
type: conference
user_id: '55222'
year: '2013'
...
---
_id: '9803'
abstract:
- lang: eng
text: Piezoelectric inertia motors, also known as stickslip drives or (smooth) impact
drives, use the inertia of a body to drive it by a friction contact in small steps,
in the majority of motors composed of a stick phase and a slip phase between the
friction partners. For optimizing inertia motors, it is important to understand
the friction contact correctly and to measure its properties appropriately. This
contribution presents experimental set-ups for measuring the contact force, friction
force and relative displacement in an actual inertia motor with a dry friction
contact and numerical simulations of the motor operation. The motor uses a pre-stressed
multilayer actuator with a displacement in the range of 20 $\mu$ m. It is shown
that a previously postulated condition for the applicability of simple kinetic
friction models is well fulfilled for the investigated motor. The friction contact
in the motor is simulated using different kinetic friction models. The input for
the friction models is the measured motion of the rod. The models qualitatively
reproduce the measured motion but show quantitative deviations varying with frequency.
These can be explained by vibrations of the driving rod that are experimentally
investigated.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: Hunstig M, Hemsel T, Sextro W. Modelling the friction contact in an inertia
motor. Journal of Intelligent Material Systems and Structures. 2013;24(11):1380-1391.
doi:10.1177/1045389X12474354
apa: Hunstig, M., Hemsel, T., & Sextro, W. (2013). Modelling the friction contact
in an inertia motor. Journal of Intelligent Material Systems and Structures,
24(11), 1380–1391. https://doi.org/10.1177/1045389X12474354
bibtex: '@article{Hunstig_Hemsel_Sextro_2013, title={Modelling the friction contact
in an inertia motor}, volume={24}, DOI={10.1177/1045389X12474354},
number={11}, journal={Journal of Intelligent Material Systems and Structures},
author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013},
pages={1380–1391} }'
chicago: 'Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Modelling the Friction
Contact in an Inertia Motor.” Journal of Intelligent Material Systems and Structures
24, no. 11 (2013): 1380–91. https://doi.org/10.1177/1045389X12474354.'
ieee: M. Hunstig, T. Hemsel, and W. Sextro, “Modelling the friction contact in an
inertia motor,” Journal of Intelligent Material Systems and Structures,
vol. 24, no. 11, pp. 1380–1391, 2013.
mla: Hunstig, Matthias, et al. “Modelling the Friction Contact in an Inertia Motor.”
Journal of Intelligent Material Systems and Structures, vol. 24, no. 11,
2013, pp. 1380–91, doi:10.1177/1045389X12474354.
short: M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material Systems
and Structures 24 (2013) 1380–1391.
date_created: 2019-05-13T14:08:01Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
doi: 10.1177/1045389X12474354
intvolume: ' 24'
issue: '11'
keyword:
- Actuator
- friction
- motor
- piezoelectric
language:
- iso: eng
page: 1380-1391
publication: Journal of Intelligent Material Systems and Structures
status: public
title: Modelling the friction contact in an inertia motor
type: journal_article
user_id: '55222'
volume: 24
year: '2013'
...
---
_id: '9804'
abstract:
- lang: eng
text: This contribution provides a systematic investigation and performance comparison
of different modes of operation for piezoelectric inertia drives. The movement
of these motors is classically assumed to consist of steps involving stiction
and sliding, resulting in the term ``stick-slip drives''. In the first part of
this contribution it has been found that using ideal driving signals, ``slip-slip''
operation without phases of stiction allows very high velocities, while the maximum
velocity is limited principally in stick-slip operation. In this part it is shown
that slip-slip operation is also suitable for use with real actuators, driven
with frequency-limited versions of the ideal signals presented in part I. The
motional performance of the motor as well as its wear and the required electric
power are investigated for operation with different signals. It is found that
for high velocity inertia motors it is recommendable to use actuators with large
stroke and to drive them with a signal consisting of two harmonics at a high fundamental
frequency, a result that is supported by similar setups implemented experimentally
by other authors. Using Lanczos' \sigma factors to calculate the frequency-limited
excitation signals instead of standard Fourier series additionally increases the
motor performance significantly. The results help motor designers to choose the
appropriate mode of operation and to optimise the motor parameters for their individual
applications.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Hunstig M, Hemsel T, Sextro W. Stick-slip and slip-slip operation of piezoelectric
inertia drives - Part II: Frequency-limited excitation. Sensors and Actuators
A: Physical. 2013;200:79-89. doi:10.1016/j.sna.2012.11.043'
apa: 'Hunstig, M., Hemsel, T., & Sextro, W. (2013). Stick-slip and slip-slip
operation of piezoelectric inertia drives - Part II: Frequency-limited excitation.
Sensors and Actuators A: Physical, 200, 79–89. https://doi.org/10.1016/j.sna.2012.11.043'
bibtex: '@article{Hunstig_Hemsel_Sextro_2013, title={Stick-slip and slip-slip operation
of piezoelectric inertia drives - Part II: Frequency-limited excitation}, volume={200},
DOI={10.1016/j.sna.2012.11.043},
journal={Sensors and Actuators A: Physical}, author={Hunstig, Matthias and Hemsel,
Tobias and Sextro, Walter}, year={2013}, pages={79–89} }'
chicago: 'Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Stick-Slip and Slip-Slip
Operation of Piezoelectric Inertia Drives - Part II: Frequency-Limited Excitation.”
Sensors and Actuators A: Physical 200 (2013): 79–89. https://doi.org/10.1016/j.sna.2012.11.043.'
ieee: 'M. Hunstig, T. Hemsel, and W. Sextro, “Stick-slip and slip-slip operation
of piezoelectric inertia drives - Part II: Frequency-limited excitation,” Sensors
and Actuators A: Physical, vol. 200, pp. 79–89, 2013.'
mla: 'Hunstig, Matthias, et al. “Stick-Slip and Slip-Slip Operation of Piezoelectric
Inertia Drives - Part II: Frequency-Limited Excitation.” Sensors and Actuators
A: Physical, vol. 200, 2013, pp. 79–89, doi:10.1016/j.sna.2012.11.043.'
short: 'M. Hunstig, T. Hemsel, W. Sextro, Sensors and Actuators A: Physical 200
(2013) 79–89.'
date_created: 2019-05-13T14:09:31Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
doi: 10.1016/j.sna.2012.11.043
intvolume: ' 200'
keyword:
- Inertia motor
language:
- iso: eng
page: 79 - 89
publication: 'Sensors and Actuators A: Physical'
quality_controlled: '1'
status: public
title: 'Stick-slip and slip-slip operation of piezoelectric inertia drives - Part
II: Frequency-limited excitation'
type: journal_article
user_id: '55222'
volume: 200
year: '2013'
...
---
_id: '9805'
abstract:
- lang: eng
text: 'Piezoelectric inertia motors, also known as ``stick--slip drives'''', use
the inertia of a body to drive it in small steps by means of a friction contact.
While these steps are classically assumed to involve stiction and sliding, the
motors can also operate in ``slip--slip'''' mode without any phase of static friction.
This contribution provides a systematic investigation and performance comparison
of different stick--slip and slip--slip modes of operation. Different criteria
for comparing the motional performance of inertia motors are defined: Steady state
velocity, smoothness of motion, and start-up time. Using the example of a translational
inertia motor excited by an ideal displacement signal, it is found that the maximum
velocity reachable in stick--slip operation is limited principally, while continuous
slip--slip operation allows very high velocities. For the investigated driving
signals, the motor velocity is proportional to the square root of the actuator
stroke. The motor performance with these ideal signals defines an upper boundary
for the performance of real motors.'
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: 'Hunstig M, Hemsel T, Sextro W. Stick-slip and slip-slip operation of piezoelectric
inertia drives - Part I: Ideal Excitation. Sensors and Actuators A: Physical.
2013;200:90-100. doi:10.1016/j.sna.2012.11.012'
apa: 'Hunstig, M., Hemsel, T., & Sextro, W. (2013). Stick-slip and slip-slip
operation of piezoelectric inertia drives - Part I: Ideal Excitation. Sensors
and Actuators A: Physical, 200, 90–100. https://doi.org/10.1016/j.sna.2012.11.012'
bibtex: '@article{Hunstig_Hemsel_Sextro_2013, title={Stick-slip and slip-slip operation
of piezoelectric inertia drives - Part I: Ideal Excitation.}, volume={200}, DOI={10.1016/j.sna.2012.11.012},
journal={Sensors and Actuators A: Physical}, author={Hunstig, Matthias and Hemsel,
Tobias and Sextro, Walter}, year={2013}, pages={90–100} }'
chicago: 'Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Stick-Slip and Slip-Slip
Operation of Piezoelectric Inertia Drives - Part I: Ideal Excitation.” Sensors
and Actuators A: Physical 200 (2013): 90–100. https://doi.org/10.1016/j.sna.2012.11.012.'
ieee: 'M. Hunstig, T. Hemsel, and W. Sextro, “Stick-slip and slip-slip operation
of piezoelectric inertia drives - Part I: Ideal Excitation.,” Sensors and Actuators
A: Physical, vol. 200, pp. 90–100, 2013.'
mla: 'Hunstig, Matthias, et al. “Stick-Slip and Slip-Slip Operation of Piezoelectric
Inertia Drives - Part I: Ideal Excitation.” Sensors and Actuators A: Physical,
vol. 200, 2013, pp. 90–100, doi:10.1016/j.sna.2012.11.012.'
short: 'M. Hunstig, T. Hemsel, W. Sextro, Sensors and Actuators A: Physical 200
(2013) 90–100.'
date_created: 2019-05-13T14:10:34Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
doi: 10.1016/j.sna.2012.11.012
intvolume: ' 200'
keyword:
- Inertia motor
- Stick--slip drive
- Mode of operation
- Performance indicator
- Velocity maximization
- Actuator stroke
language:
- iso: eng
page: 90 - 100
publication: 'Sensors and Actuators A: Physical'
quality_controlled: '1'
status: public
title: 'Stick-slip and slip-slip operation of piezoelectric inertia drives - Part
I: Ideal Excitation.'
type: journal_article
user_id: '55222'
volume: 200
year: '2013'
...
---
_id: '9863'
abstract:
- lang: eng
text: The 9th International Workshop on Piezoelectric Materials and Applications
in Actuators (IWPMA 2012) was successfully held on 22–25 April 2012 in Hirosaki,
Japan. The general chair was Prof. M.K. Kurosawa from the Tokyo Institute of Technology,
Japan. In the past, Korea, Germany, Turkey, China, and USA have hosted the annual
conference, but this was the first time for the annual IWPMA conference to be
held in Japan. The IWPMA 2012 was organized as a joint symposium with JTTAS Smart
Actuator/Sensor Study Committee and ICAT International Actuator Symposium. More
than 150 people from the world (12 countries) participated and had fruitful discussions
with 138 presentations including 11 invited talks. In addition to piezoelectric
materials and piezoelectric actuators, the presentation topics were expanded to
include solid-state actuators, energy harvesting, multifunctional materials, and
other current important issues. It is our honor to pronounce that the “Sensors
and Actuators A” journal has published this special issue on the IWPMA 2012 including
the best 25 contributions. This issue covers the functional materials, such as
piezoelectric and magnetostrictive materials, and their applications. However,
for the innovative devices, various ideas concerning materials, mechanisms, designs,
fabrication process, and control-systems are also required to be organically combined.
From the view of this concept, we believe the published 25 papers can excite the
researcher's intellectual curiosity concerning these issues and can serve as the
driving force for further breakthroughs. Please enjoy the latest research results
selected by our editor team. Finally, we appreciate all participants in the IWPMA
2012 and the devoted reviewers for the publication. We hope that the papers in
this special issue will open up the next researches, which will be presented in
the future IWPMA conferences.
citation:
ama: Morita T, Hemsel T, Ijima T, et al., eds. Selected Papers from the 9th International
Workshop on Piezoelectric Materials and Applications in Actuators. Vol 200.
Elsevier; 2013:1-172. doi:10.1016/j.sna.2013.06.017
apa: 'Morita, T., Hemsel, T., Ijima, T., Jeong, D. Y., Kanda, T., Twiefel, J., …
Lallart, M. (Eds.). (2013). Selected Papers from the 9th International Workshop
on Piezoelectric Materials and Applications in Actuators. Sensors and Actuators
A: Physical (Vol. 200, pp. 1–172). Hirosaki: Elsevier. https://doi.org/10.1016/j.sna.2013.06.017'
bibtex: '@book{Morita_Hemsel_Ijima_Jeong_Kanda_Twiefel_Uzgur_Lallart_2013, title={Selected
Papers from the 9th International Workshop on Piezoelectric Materials and Applications
in Actuators}, volume={200}, DOI={10.1016/j.sna.2013.06.017},
journal={Sensors and Actuators A: Physical}, publisher={Elsevier}, year={2013},
pages={1–172} }'
chicago: 'Morita, Takeshi, Tobias Hemsel, T. Ijima, D. Y. Jeong, T. Kanda, Jens
Twiefel, E. Uzgur, and M. Lallart, eds. Selected Papers from the 9th International
Workshop on Piezoelectric Materials and Applications in Actuators. Sensors
and Actuators A: Physical. Vol. 200. Elsevier, 2013. https://doi.org/10.1016/j.sna.2013.06.017.'
ieee: T. Morita et al., Eds., Selected Papers from the 9th International
Workshop on Piezoelectric Materials and Applications in Actuators, vol. 200.
Elsevier, 2013, pp. 1–172.
mla: 'Morita, Takeshi, et al., editors. “Selected Papers from the 9th International
Workshop on Piezoelectric Materials and Applications in Actuators.” Sensors
and Actuators A: Physical, vol. 200, Elsevier, 2013, pp. 1–172, doi:10.1016/j.sna.2013.06.017.'
short: T. Morita, T. Hemsel, T. Ijima, D.Y. Jeong, T. Kanda, J. Twiefel, E. Uzgur,
M. Lallart, eds., Selected Papers from the 9th International Workshop on Piezoelectric
Materials and Applications in Actuators, Elsevier, 2013.
conference:
end_date: 2012-04-25
location: Hirosaki
name: International Workshop on Piezoelectric Materials and Applications in Actuators
start_date: 2012-04-22
date_created: 2019-05-20T11:56:03Z
date_updated: 2020-12-18T11:19:37Z
department:
- _id: '151'
doi: 10.1016/j.sna.2013.06.017
editor:
- first_name: Takeshi
full_name: Morita, Takeshi
last_name: Morita
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: T.
full_name: Ijima, T.
last_name: Ijima
- first_name: D. Y.
full_name: Jeong, D. Y.
last_name: Jeong
- first_name: T.
full_name: Kanda, T.
last_name: Kanda
- first_name: Jens
full_name: Twiefel, Jens
last_name: Twiefel
- first_name: E.
full_name: Uzgur, E.
last_name: Uzgur
- first_name: M.
full_name: Lallart, M.
last_name: Lallart
intvolume: ' 200'
language:
- iso: eng
page: 1-172
publication: 'Sensors and Actuators A: Physical'
publisher: Elsevier
quality_controlled: '1'
status: public
title: Selected Papers from the 9th International Workshop on Piezoelectric Materials
and Applications in Actuators
type: journal_editor
user_id: '210'
volume: 200
year: '2013'
...
---
_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: '9867'
abstract:
- lang: eng
text: We report the piezoelectric properties of CuO-doped hydrothermal (K,Na)NbO3
ceramics that can be applied as hard-type lead-free piezoelectric ceramics. To
date, we have succeeded in synthesizing high-quality KNbO3 and NaNbO3 powders
by the hydrothermal method, which is based on an ionic reaction at high temperature
(around 210 $\,^{\circ}$C) and pressure. Increasing both the piezoelectric constant
d and the mechanical quality factor (Qm) is important for resonance-type piezoelectric
devices, such as ultrasonic motors and transformers. CuO doping into hydrothermal
(K,Na)NbO3 ceramics was examined to realize hard-type lead-free piezoelectric
ceramics. By doping with 1.2 mol \% CuO, Qm was increased and the dielectric loss
(tan δ) was decreased to 0.5\%. The grain size was also influenced by the amount
of CuO doping, which indicates that Qm is related to the density. To achieve a
higher Qm value, the grain size is required to be less than 5 µm; however, excessive
CuO doping leads to anomalous grain growth. Optimal piezoelectric properties were
obtained for 1.2 mol \% CuO-doped (K,Na)NbO3; k31 = 0.32, d31 = -44 pC/N, Qm (radial)
= 959, and tan δ= 0.5\%. These characteristics showed that CuO doping with hydrothermal
powders is effective for obtaining hard-type ceramics, and the mechanical quality
factor is more than ten times higher than that of nondoped hydrothermal (K,Na)NbO3
ceramics. Therefore, compared with the conventional solid-state method, we could
succeed in obtaining hard-type ceramics by a simple and short process.
author:
- first_name: Yuriko
full_name: Yokouchi, Yuriko
last_name: Yokouchi
- first_name: Takafumi
full_name: Maeda, Takafumi
last_name: Maeda
- 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: Yokouchi Y, Maeda T, Bornmann P, Hemsel T, Morita T. Piezoelectric Properties
of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized with Hydrothermal Powders.
Japanese Journal of Applied Physics. 2013;52(7S). doi:10.7567/JJAP.52.07HB03
apa: Yokouchi, Y., Maeda, T., Bornmann, P., Hemsel, T., & Morita, T. (2013).
Piezoelectric Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized
with Hydrothermal Powders. Japanese Journal of Applied Physics, 52(7S).
https://doi.org/10.7567/JJAP.52.07HB03
bibtex: '@article{Yokouchi_Maeda_Bornmann_Hemsel_Morita_2013, title={Piezoelectric
Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized with Hydrothermal
Powders}, volume={52}, DOI={10.7567/JJAP.52.07HB03},
number={7S}, journal={Japanese Journal of Applied Physics}, author={Yokouchi,
Yuriko and Maeda, Takafumi and Bornmann, Peter and Hemsel, Tobias and Morita,
Takeshi}, year={2013} }'
chicago: Yokouchi, Yuriko, Takafumi Maeda, Peter Bornmann, Tobias Hemsel, and Takeshi
Morita. “Piezoelectric Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized
with Hydrothermal Powders.” Japanese Journal of Applied Physics 52, no.
7S (2013). https://doi.org/10.7567/JJAP.52.07HB03.
ieee: Y. Yokouchi, T. Maeda, P. Bornmann, T. Hemsel, and T. Morita, “Piezoelectric
Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized with Hydrothermal
Powders,” Japanese Journal of Applied Physics, vol. 52, no. 7S, 2013.
mla: Yokouchi, Yuriko, et al. “Piezoelectric Properties of CuO-Doped (K,Na)NbO3
Lead-Free Ceramics Synthesized with Hydrothermal Powders.” Japanese Journal
of Applied Physics, vol. 52, no. 7S, 2013, doi:10.7567/JJAP.52.07HB03.
short: Y. Yokouchi, T. Maeda, P. Bornmann, T. Hemsel, T. Morita, Japanese Journal
of Applied Physics 52 (2013).
date_created: 2019-05-20T12:06:04Z
date_updated: 2019-05-20T12:08:02Z
department:
- _id: '151'
doi: 10.7567/JJAP.52.07HB03
intvolume: ' 52'
issue: 7S
language:
- iso: eng
publication: Japanese Journal of Applied Physics
status: public
title: Piezoelectric Properties of CuO-Doped (K,Na)NbO3 Lead-Free Ceramics Synthesized
with Hydrothermal Powders
type: journal_article
user_id: '55222'
volume: 52
year: '2013'
...
---
_id: '9781'
abstract:
- lang: eng
text: 'A piezoelectric energy harvester is an electromechanical device that converts
ambient mechanical vibration into electric power. Most existing vibration energy
harvesting devices operate effectively at a single frequency only, dictated by
the design of the device. This frequency must match the frequency of the host
structure vibration. However, real world structural vibrations rarely have a specific
constant frequency. Therefore, piezoelectric harvesters that generate usable power
across a range of exciting frequencies are required to make this technology commercially
viable. Currently known harvester tuning techniques have many limitations, in
particular they miss the ability to work during harvester operation and most often
cannot perform a precise tuning. This paper describes the design and testing of
a vibration energy harvester with tunable resonance frequency, wherein the tuning
is accomplished by changing the attraction force between two permanent magnets
by adjusting the distance between the magnets. This tuning technique allows the
natural frequency to be manipulated before and during operation of the harvester.
Furthermore the paper presents a physical description of the frequency tuning
effect. The experimental results achieved with a piezoelectric bimorph fit the
calculated results very well. The calculation and experimental results show that
using this tuning technique the natural frequency of the harvester can be varied
efficiently within a wide range: in the test setup, the natural frequency of the
piezoelectric bimorph could be increased by more than 70\%.'
author:
- first_name: Waleed
full_name: Al-Ashtari, Waleed
last_name: Al-Ashtari
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Frequency tuning of piezoelectric
energy harvesters by magnetic force. Smart Materials and Structures. 2012;21(3):035019.
apa: Al-Ashtari, W., Hunstig, M., Hemsel, T., & Sextro, W. (2012). Frequency
tuning of piezoelectric energy harvesters by magnetic force. Smart Materials
and Structures, 21(3), 035019.
bibtex: '@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2012, title={Frequency tuning
of piezoelectric energy harvesters by magnetic force}, volume={21}, number={3},
journal={Smart Materials and Structures}, author={Al-Ashtari, Waleed and Hunstig,
Matthias and Hemsel, Tobias and Sextro, Walter}, year={2012}, pages={035019} }'
chicago: 'Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro.
“Frequency Tuning of Piezoelectric Energy Harvesters by Magnetic Force.” Smart
Materials and Structures 21, no. 3 (2012): 035019.'
ieee: W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Frequency tuning of
piezoelectric energy harvesters by magnetic force,” Smart Materials and Structures,
vol. 21, no. 3, p. 035019, 2012.
mla: Al-Ashtari, Waleed, et al. “Frequency Tuning of Piezoelectric Energy Harvesters
by Magnetic Force.” Smart Materials and Structures, vol. 21, no. 3, 2012,
p. 035019.
short: W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Smart Materials and Structures
21 (2012) 035019.
date_created: 2019-05-13T13:16:33Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
intvolume: ' 21'
issue: '3'
language:
- iso: eng
page: '035019'
publication: Smart Materials and Structures
quality_controlled: '1'
status: public
title: Frequency tuning of piezoelectric energy harvesters by magnetic force
type: journal_article
user_id: '55222'
volume: 21
year: '2012'
...
---
_id: '9782'
abstract:
- lang: eng
text: Piezoelectric structures are nowadays used in many different applications.
A better understanding of the influence of material properties and geometrical
design on the performance of these structures helps to develop piezoelectric structures
specifically designed for their application. Different equivalent circuits have
been introduced in the literature to investigate the behaviour of piezoelectric
transducers. The model parameters are usually determined from measurements covering
the characteristic frequencies of the piezoelectric transducer. This article introduces
an analytical technique for calculating the mechanical and electrical equivalent
system parameters and characteristic frequencies based on material properties
and geometry for a cantilever bimorph structure. The model is validated by measurements
using a cantilever bimorph and fits the experimental results better than previous
models. The model gives a full set of piezoelectric transducer parameters and
is therefore well suited for further theoretical investigations of piezoelectric
transducers for different applications. The results also show that even small
manufacturing tolerances have a considerable effect on the system parameters and
characteristic frequencies. This might lead to intolerable deviations, especially
in dynamic applications and should be avoided by careful design and production.
author:
- first_name: Waleed
full_name: Al-Ashtari, Waleed
last_name: Al-Ashtari
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- 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: Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Analytical determination of characteristic
frequencies and equivalent circuit parameters of a piezoelectric bimorph. Journal
of Intelligent Material Systems and Structures. 2012;23(1):15-23. doi:10.1177/1045389X11430742
apa: Al-Ashtari, W., Hunstig, M., Hemsel, T., & Sextro, W. (2012). Analytical
determination of characteristic frequencies and equivalent circuit parameters
of a piezoelectric bimorph. Journal of Intelligent Material Systems and Structures,
23(1), 15–23. https://doi.org/10.1177/1045389X11430742
bibtex: '@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2012, title={Analytical determination
of characteristic frequencies and equivalent circuit parameters of a piezoelectric
bimorph}, volume={23}, DOI={10.1177/1045389X11430742},
number={1}, journal={Journal of Intelligent Material Systems and Structures},
author={Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro,
Walter}, year={2012}, pages={15–23} }'
chicago: 'Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro.
“Analytical Determination of Characteristic Frequencies and Equivalent Circuit
Parameters of a Piezoelectric Bimorph.” Journal of Intelligent Material Systems
and Structures 23, no. 1 (2012): 15–23. https://doi.org/10.1177/1045389X11430742.'
ieee: W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Analytical determination
of characteristic frequencies and equivalent circuit parameters of a piezoelectric
bimorph,” Journal of Intelligent Material Systems and Structures, vol.
23, no. 1, pp. 15–23, 2012.
mla: Al-Ashtari, Waleed, et al. “Analytical Determination of Characteristic Frequencies
and Equivalent Circuit Parameters of a Piezoelectric Bimorph.” Journal of Intelligent
Material Systems and Structures, vol. 23, no. 1, 2012, pp. 15–23, doi:10.1177/1045389X11430742.
short: W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material
Systems and Structures 23 (2012) 15–23.
date_created: 2019-05-13T13:17:37Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1177/1045389X11430742
intvolume: ' 23'
issue: '1'
language:
- iso: eng
page: 15-23
publication: Journal of Intelligent Material Systems and Structures
quality_controlled: '1'
status: public
title: Analytical determination of characteristic frequencies and equivalent circuit
parameters of a piezoelectric bimorph
type: journal_article
user_id: '55222'
volume: 23
year: '2012'
...