---
_id: '9586'
author:
- first_name: Marc
full_name: Beutner, Marc
id: '21118'
last_name: Beutner
- first_name: S
full_name: Rose, S
last_name: Rose
citation:
ama: 'Beutner M, Rose S. Ausbildungsfähigkeit und Basiskompetenzen – Eine Herausforderung
für den Justizvollzug. In: Beutner M, Kremer H-H, Wirth W, eds. Berufsorientierung,
Gewaltsensibilisierung und Kompetenzentwicklung. Konzepte zur beruflichen Bildung
im Jungtätervollzug. Paderborn; 2013:197-216.'
apa: Beutner, M., & Rose, S. (2013). Ausbildungsfähigkeit und Basiskompetenzen
– Eine Herausforderung für den Justizvollzug. In M Beutner, H.-H. Kremer, &
W. Wirth (Eds.), Berufsorientierung, Gewaltsensibilisierung und Kompetenzentwicklung.
Konzepte zur beruflichen Bildung im Jungtätervollzug (pp. 197–216). Paderborn.
bibtex: '@inbook{Beutner_Rose_2013, place={Paderborn}, title={Ausbildungsfähigkeit
und Basiskompetenzen – Eine Herausforderung für den Justizvollzug}, booktitle={Berufsorientierung,
Gewaltsensibilisierung und Kompetenzentwicklung. Konzepte zur beruflichen Bildung
im Jungtätervollzug}, author={Beutner, Marc and Rose, S}, editor={Beutner, M and
Kremer, H.-H and Wirth, WEditors}, year={2013}, pages={197–216} }'
chicago: Beutner, Marc, and S Rose. “Ausbildungsfähigkeit und Basiskompetenzen –
Eine Herausforderung für den Justizvollzug.” In Berufsorientierung, Gewaltsensibilisierung
und Kompetenzentwicklung. Konzepte zur beruflichen Bildung im Jungtätervollzug,
edited by M Beutner, H.-H Kremer, and W Wirth, 197–216. Paderborn, 2013.
ieee: M. Beutner and S. Rose, “Ausbildungsfähigkeit und Basiskompetenzen – Eine
Herausforderung für den Justizvollzug,” in Berufsorientierung, Gewaltsensibilisierung
und Kompetenzentwicklung. Konzepte zur beruflichen Bildung im Jungtätervollzug,
M. Beutner, H.-H. Kremer, and W. Wirth, Eds. Paderborn, 2013, pp. 197–216.
mla: Beutner, Marc, and S. Rose. “Ausbildungsfähigkeit und Basiskompetenzen – Eine
Herausforderung für den Justizvollzug.” Berufsorientierung, Gewaltsensibilisierung
und Kompetenzentwicklung. Konzepte zur beruflichen Bildung im Jungtätervollzug,
edited by M Beutner et al., 2013, pp. 197–216.
short: 'M. Beutner, S. Rose, in: M. Beutner, H.-H. Kremer, W. Wirth (Eds.), Berufsorientierung,
Gewaltsensibilisierung und Kompetenzentwicklung. Konzepte zur beruflichen Bildung
im Jungtätervollzug, Paderborn, 2013, pp. 197–216.'
date_created: 2019-05-02T07:28:57Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '211'
editor:
- first_name: M
full_name: Beutner, M
last_name: Beutner
- first_name: H.-H
full_name: Kremer, H.-H
last_name: Kremer
- first_name: W
full_name: Wirth, W
last_name: Wirth
language:
- iso: ger
page: 197 - 216
place: Paderborn
publication: Berufsorientierung, Gewaltsensibilisierung und Kompetenzentwicklung.
Konzepte zur beruflichen Bildung im Jungtätervollzug
status: public
title: Ausbildungsfähigkeit und Basiskompetenzen – Eine Herausforderung für den Justizvollzug
type: book_chapter
user_id: '66030'
year: '2013'
...
---
_id: '9629'
author:
- first_name: Merle
full_name: Tönnies, Merle
id: '555'
last_name: Tönnies
citation:
ama: 'Tönnies M. Middeke,M. / Schnierer, P.P. / Sierz, A. (Hg.): The Methuen Guide
to Contemporary British Playwrights. Anglia. 2013;131(1):183-188.'
apa: 'Tönnies, M. (2013). Middeke,M. / Schnierer, P.P. / Sierz, A. (Hg.): The Methuen
Guide to Contemporary British Playwrights. Anglia.'
bibtex: '@article{Tönnies_2013, title={Middeke,M. / Schnierer, P.P. / Sierz, A.
(Hg.): The Methuen Guide to Contemporary British Playwrights}, volume={131}, number={1},
journal={Anglia}, author={Tönnies, Merle}, year={2013}, pages={183–188} }'
chicago: 'Tönnies, Merle. “Middeke,M. / Schnierer, P.P. / Sierz, A. (Hg.): The Methuen
Guide to Contemporary British Playwrights.” Anglia, 2013.'
ieee: 'M. Tönnies, “Middeke,M. / Schnierer, P.P. / Sierz, A. (Hg.): The Methuen
Guide to Contemporary British Playwrights,” Anglia, vol. 131, no. 1. pp.
183–188, 2013.'
mla: 'Tönnies, Merle. “Middeke,M. / Schnierer, P.P. / Sierz, A. (Hg.): The Methuen
Guide to Contemporary British Playwrights.” Anglia, vol. 131, no. 1, 2013,
pp. 183–88.'
short: M. Tönnies, Anglia 131 (2013) 183–188.
date_created: 2019-05-07T09:11:35Z
date_updated: 2022-01-06T07:04:17Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
intvolume: ' 131'
issue: '1'
language:
- iso: eng
page: 183-188
publication: Anglia
publication_status: published
status: public
title: 'Middeke,M. / Schnierer, P.P. / Sierz, A. (Hg.): The Methuen Guide to Contemporary
British Playwrights'
type: review
user_id: '32277'
volume: 131
year: '2013'
...
---
_id: '9630'
author:
- first_name: Merle
full_name: Tönnies, Merle
id: '555'
last_name: Tönnies
citation:
ama: Tönnies M. Rossow, H. Globalismus und Lew Labour. Anglistik International
Journal of English Studies. 2013;24(2):223-225.
apa: Tönnies, M. (2013). Rossow, H. Globalismus und Lew Labour. Anglistik. International
Journal of English Studies.
bibtex: '@article{Tönnies_2013, title={Rossow, H. Globalismus und Lew Labour}, volume={24},
number={2}, journal={Anglistik. International Journal of English Studies}, author={Tönnies,
Merle}, year={2013}, pages={223–225} }'
chicago: Tönnies, Merle. “Rossow, H. Globalismus Und Lew Labour.” Anglistik.
International Journal of English Studies, 2013.
ieee: M. Tönnies, “Rossow, H. Globalismus und Lew Labour,” Anglistik. International
Journal of English Studies, vol. 24, no. 2. pp. 223–225, 2013.
mla: Tönnies, Merle. “Rossow, H. Globalismus Und Lew Labour.” Anglistik. International
Journal of English Studies, vol. 24, no. 2, 2013, pp. 223–25.
short: M. Tönnies, Anglistik. International Journal of English Studies 24 (2013)
223–225.
date_created: 2019-05-07T09:15:27Z
date_updated: 2022-01-06T07:04:17Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
intvolume: ' 24'
issue: '2'
language:
- iso: eng
page: 223-225
publication: Anglistik. International Journal of English Studies
publication_status: published
status: public
title: Rossow, H. Globalismus und Lew Labour
type: review
user_id: '32277'
volume: 24
year: '2013'
...
---
_id: '9632'
author:
- first_name: Merle
full_name: Tönnies, Merle
id: '555'
last_name: Tönnies
citation:
ama: 'Tönnies M. Baumbach, S. / Neumann, B. / Nünning, A.: A History of British
Drama. Anglistik International Journal of English Studies. 2013;24(1):201-203.'
apa: 'Tönnies, M. (2013). Baumbach, S. / Neumann, B. / Nünning, A.: A History of
British Drama. Anglistik. International Journal of English Studies.'
bibtex: '@article{Tönnies_2013, title={Baumbach, S. / Neumann, B. / Nünning, A.:
A History of British Drama}, volume={24}, number={1}, journal={Anglistik. International
Journal of English Studies}, author={Tönnies, Merle}, year={2013}, pages={201–203}
}'
chicago: 'Tönnies, Merle. “Baumbach, S. / Neumann, B. / Nünning, A.: A History of
British Drama.” Anglistik. International Journal of English Studies, 2013.'
ieee: 'M. Tönnies, “Baumbach, S. / Neumann, B. / Nünning, A.: A History of British
Drama,” Anglistik. International Journal of English Studies, vol. 24, no.
1. pp. 201–203, 2013.'
mla: 'Tönnies, Merle. “Baumbach, S. / Neumann, B. / Nünning, A.: A History of British
Drama.” Anglistik. International Journal of English Studies, vol. 24, no.
1, 2013, pp. 201–03.'
short: M. Tönnies, Anglistik. International Journal of English Studies 24 (2013)
201–203.
date_created: 2019-05-07T09:17:56Z
date_updated: 2022-01-06T07:04:17Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
intvolume: ' 24'
issue: '1'
language:
- iso: eng
page: 201-203
publication: Anglistik. International Journal of English Studies
publication_status: published
status: public
title: 'Baumbach, S. / Neumann, B. / Nünning, A.: A History of British Drama'
type: review
user_id: '32277'
volume: 24
year: '2013'
...
---
_id: '9705'
author:
- first_name: Marc
full_name: Beutner, Marc
id: '21118'
last_name: Beutner
- first_name: L. M.
full_name: Fortmann, L. M.
last_name: Fortmann
citation:
ama: Beutner M, Fortmann LM. COR-VET – Career Orientation in Vocational Education
and Training in Europe. Kölner Zeitschrift für Wirtschaft und Pädagogik.
2013;28(54).
apa: Beutner, M., & Fortmann, L. M. (2013). COR-VET – Career Orientation in
Vocational Education and Training in Europe. Kölner Zeitschrift Für Wirtschaft
Und Pädagogik, 28(54).
bibtex: '@article{Beutner_Fortmann_2013, title={COR-VET – Career Orientation in
Vocational Education and Training in Europe}, volume={28}, number={54}, journal={Kölner
Zeitschrift für Wirtschaft und Pädagogik}, author={Beutner, Marc and Fortmann,
L. M.}, year={2013} }'
chicago: Beutner, Marc, and L. M. Fortmann. “COR-VET – Career Orientation in Vocational
Education and Training in Europe.” Kölner Zeitschrift Für Wirtschaft Und Pädagogik
28, no. 54 (2013).
ieee: M. Beutner and L. M. Fortmann, “COR-VET – Career Orientation in Vocational
Education and Training in Europe,” Kölner Zeitschrift für Wirtschaft und Pädagogik,
vol. 28, no. 54, 2013.
mla: Beutner, Marc, and L. M. Fortmann. “COR-VET – Career Orientation in Vocational
Education and Training in Europe.” Kölner Zeitschrift Für Wirtschaft Und Pädagogik,
vol. 28, no. 54, 2013.
short: M. Beutner, L.M. Fortmann, Kölner Zeitschrift Für Wirtschaft Und Pädagogik
28 (2013).
date_created: 2019-05-08T09:17:16Z
date_updated: 2022-01-06T07:04:18Z
department:
- _id: '211'
intvolume: ' 28'
issue: '54'
language:
- iso: eng
publication: Kölner Zeitschrift für Wirtschaft und Pädagogik
status: public
title: COR-VET – Career Orientation in Vocational Education and Training in Europe
type: journal_article
user_id: '66030'
volume: 28
year: '2013'
...
---
_id: '9713'
author:
- first_name: Sara
full_name: Strauß, Sara
id: '3218'
last_name: Strauß
citation:
ama: Strauß S. “This Bright Inward Cinema of Thought” – Stream of Consciousness
in Contemporary English Fiction. WVT; 2013.
apa: Strauß, S. (2013). “This Bright Inward Cinema of Thought” – Stream of Consciousness
in Contemporary English Fiction. WVT.
bibtex: '@book{Strauß_2013, place={Trier}, title={“This Bright Inward Cinema of
Thought” – Stream of Consciousness in Contemporary English Fiction}, publisher={WVT},
author={Strauß, Sara}, year={2013} }'
chicago: 'Strauß, Sara. “This Bright Inward Cinema of Thought” – Stream of Consciousness
in Contemporary English Fiction. Trier: WVT, 2013.'
ieee: 'S. Strauß, “This Bright Inward Cinema of Thought” – Stream of Consciousness
in Contemporary English Fiction. Trier: WVT, 2013.'
mla: Strauß, Sara. “This Bright Inward Cinema of Thought” – Stream of Consciousness
in Contemporary English Fiction. WVT, 2013.
short: S. Strauß, “This Bright Inward Cinema of Thought” – Stream of Consciousness
in Contemporary English Fiction, WVT, Trier, 2013.
date_created: 2019-05-10T14:30:22Z
date_updated: 2022-01-06T07:04:18Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
language:
- iso: eng
place: Trier
publication_status: published
publisher: WVT
status: public
title: '"This Bright Inward Cinema of Thought" – Stream of Consciousness in Contemporary
English Fiction'
type: book
user_id: '3218'
year: '2013'
...
---
_id: '9724'
author:
- first_name: Christina
full_name: Flotmann, Christina
id: '8736'
last_name: Flotmann
citation:
ama: 'Flotmann C. ‘Monstrous’ Homes: How Private Spaces Shape Characters’ Identities
in 19th-century Sensation Fiction. In: Montin S, Tsitas E, eds. Monstrous
Geographies: Places and Spaces of the Monstrous. Oxfordshire: Inter-Disciplinary
Press; 2013:75-96.'
apa: 'Flotmann, C. (2013). ‘Monstrous’ Homes: How Private Spaces Shape Characters’
Identities in 19th-century Sensation Fiction. In S. Montin & E. Tsitas (Eds.),
Monstrous Geographies: Places and Spaces of the Monstrous (pp. 75–96).
Oxfordshire: Inter-Disciplinary Press.'
bibtex: '@inbook{Flotmann_2013, place={Oxfordshire}, title={‘Monstrous’ Homes: How
Private Spaces Shape Characters’ Identities in 19th-century Sensation Fiction},
booktitle={Monstrous Geographies: Places and Spaces of the Monstrous}, publisher={Inter-Disciplinary
Press}, author={Flotmann, Christina}, editor={Montin, Sarah and Tsitas, EvelynEditors},
year={2013}, pages={75–96} }'
chicago: 'Flotmann, Christina. “‘Monstrous’ Homes: How Private Spaces Shape Characters’
Identities in 19th-Century Sensation Fiction.” In Monstrous Geographies: Places
and Spaces of the Monstrous, edited by Sarah Montin and Evelyn Tsitas, 75–96.
Oxfordshire: Inter-Disciplinary Press, 2013.'
ieee: 'C. Flotmann, “‘Monstrous’ Homes: How Private Spaces Shape Characters’ Identities
in 19th-century Sensation Fiction,” in Monstrous Geographies: Places and Spaces
of the Monstrous, S. Montin and E. Tsitas, Eds. Oxfordshire: Inter-Disciplinary
Press, 2013, pp. 75–96.'
mla: 'Flotmann, Christina. “‘Monstrous’ Homes: How Private Spaces Shape Characters’
Identities in 19th-Century Sensation Fiction.” Monstrous Geographies: Places
and Spaces of the Monstrous, edited by Sarah Montin and Evelyn Tsitas, Inter-Disciplinary
Press, 2013, pp. 75–96.'
short: 'C. Flotmann, in: S. Montin, E. Tsitas (Eds.), Monstrous Geographies: Places
and Spaces of the Monstrous, Inter-Disciplinary Press, Oxfordshire, 2013, pp.
75–96.'
date_created: 2019-05-13T07:26:58Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
editor:
- first_name: Sarah
full_name: Montin, Sarah
last_name: Montin
- first_name: Evelyn
full_name: Tsitas, Evelyn
last_name: Tsitas
language:
- iso: eng
page: 75-96
place: Oxfordshire
publication: 'Monstrous Geographies: Places and Spaces of the Monstrous'
publication_status: published
publisher: Inter-Disciplinary Press
status: public
title: '‘Monstrous’ Homes: How Private Spaces Shape Characters’ Identities in 19th-century
Sensation Fiction'
type: book_chapter
user_id: '32277'
year: '2013'
...
---
_id: '9725'
author:
- first_name: Christina
full_name: Flotmann, Christina
id: '8736'
last_name: Flotmann
citation:
ama: 'Flotmann C. Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A (Post-)Structuralist
Reading of Two Popular Myths. Bielefeld: transcript; 2013.'
apa: 'Flotmann, C. (2013). Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A (Post-)Structuralist
Reading of Two Popular Myths. Bielefeld: transcript.'
bibtex: '@book{Flotmann_2013, place={Bielefeld}, title={Ambiguity in ‘Star Wars’
and ‘Harry Potter’: A (Post-)Structuralist Reading of Two Popular Myths}, publisher={transcript},
author={Flotmann, Christina}, year={2013} }'
chicago: 'Flotmann, Christina. Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A
(Post-)Structuralist Reading of Two Popular Myths. Bielefeld: transcript,
2013.'
ieee: 'C. Flotmann, Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A (Post-)Structuralist
Reading of Two Popular Myths. Bielefeld: transcript, 2013.'
mla: 'Flotmann, Christina. Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A (Post-)Structuralist
Reading of Two Popular Myths. transcript, 2013.'
short: 'C. Flotmann, Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A (Post-)Structuralist
Reading of Two Popular Myths, transcript, Bielefeld, 2013.'
date_created: 2019-05-13T07:28:18Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
language:
- iso: eng
place: Bielefeld
publication_status: published
publisher: transcript
status: public
title: 'Ambiguity in ‘Star Wars’ and ‘Harry Potter’: A (Post-)Structuralist Reading
of Two Popular Myths'
type: book
user_id: '32277'
year: '2013'
...
---
_id: '9732'
abstract:
- lang: eng
text: "Interview\r\n2 Feb. 2013"
author:
- first_name: Christina
full_name: Flotmann, Christina
id: '8736'
last_name: Flotmann
citation:
ama: 'Flotmann C. Populäre Mythen Bei Star Wars Und Harry Potter. Berlin:
radioeins rbb Berlin, Die Profis; 2013.'
apa: 'Flotmann, C. (2013). Populäre Mythen bei Star Wars und Harry Potter.
Berlin: radioeins rbb Berlin, Die Profis.'
bibtex: '@book{Flotmann_2013, place={Berlin}, title={Populäre Mythen bei Star Wars
und Harry Potter}, publisher={radioeins rbb Berlin, Die Profis}, author={Flotmann,
Christina}, year={2013} }'
chicago: 'Flotmann, Christina. Populäre Mythen Bei Star Wars Und Harry Potter.
Berlin: radioeins rbb Berlin, Die Profis, 2013.'
ieee: 'C. Flotmann, Populäre Mythen bei Star Wars und Harry Potter. Berlin:
radioeins rbb Berlin, Die Profis, 2013.'
mla: Flotmann, Christina. Populäre Mythen Bei Star Wars Und Harry Potter.
radioeins rbb Berlin, Die Profis, 2013.
short: C. Flotmann, Populäre Mythen Bei Star Wars Und Harry Potter, radioeins rbb
Berlin, Die Profis, Berlin, 2013.
date_created: 2019-05-13T07:45:34Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '36'
- _id: '1'
- _id: '380'
language:
- iso: eng
place: Berlin
publisher: radioeins rbb Berlin, Die Profis
status: public
title: Populäre Mythen bei Star Wars und Harry Potter
type: misc
user_id: '32277'
year: '2013'
...
---
_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: '9799'
abstract:
- lang: eng
text: 'Ultrasonic wire bonding is a common technology for manufacturing electrical
interconnects. In the field of power electronics, new thermal and electrical obligations
arose due to increasing power density requirements. One approach to achieve these
aims is replacing the wire material for heavy wire bonds from aluminum to copper.
This material change leads to challenging tasks and problems, for instance the
occurring wear of the bond tool. The wear is significantly higher using copper
wire instead of aluminum and results in a dramatic loss in the amount of interconnects
which can be produced reliable by a single tool. To reduce setting-up time in
the production and minimizing costs, an enlarged bonding tool lifetime is desirable.
Therefore, the paper discusses the influences of bonding parameters on the wear.
The key question is which of the tasks cannot be fulfilled with increased wear
of the tool, e.g. loss of process capability. The main functions are fixing the
wire in the tool groove, predeformation, applying normal force and transmission
of ultrasonic oscillation to the wire. To identify the most affecting factors,
four bonding parameters are varied and their influences are investigated. These
parameters are: (I) ultrasonic power, (II) tool geometry, (III) the way of tangential
force transmission and (IV) loop trajectory.'
author:
- first_name: Paul
full_name: Eichwald, Paul
last_name: Eichwald
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Florian
full_name: Eacock, Florian
last_name: Eacock
- first_name: Mark
full_name: Schnietz, Mark
last_name: Schnietz
- first_name: Karsten
full_name: Guth, Karsten
last_name: Guth
- first_name: Michael
full_name: Brökelmann, Michael
last_name: Brökelmann
citation:
ama: 'Eichwald P, Sextro W, Althoff S, et al. Influences of Bonding Parameters on
the Tool Wear for Copper Wire Bonding. In: 15th Electronics Packaging Technology
Conference. ; 2013. doi:10.1109/EPTC.2013.6745803'
apa: Eichwald, P., Sextro, W., Althoff, S., Eacock, F., Schnietz, M., Guth, K.,
& Brökelmann, M. (2013). Influences of Bonding Parameters on the Tool Wear
for Copper Wire Bonding. In 15th Electronics Packaging Technology Conference.
https://doi.org/10.1109/EPTC.2013.6745803
bibtex: '@inproceedings{Eichwald_Sextro_Althoff_Eacock_Schnietz_Guth_Brökelmann_2013,
title={Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding},
DOI={10.1109/EPTC.2013.6745803},
booktitle={15th Electronics Packaging Technology Conference}, author={Eichwald,
Paul and Sextro, Walter and Althoff, Simon and Eacock, Florian and Schnietz, Mark
and Guth, Karsten and Brökelmann, Michael}, year={2013} }'
chicago: Eichwald, Paul, Walter Sextro, Simon Althoff, Florian Eacock, Mark Schnietz,
Karsten Guth, and Michael Brökelmann. “Influences of Bonding Parameters on the
Tool Wear for Copper Wire Bonding.” In 15th Electronics Packaging Technology
Conference, 2013. https://doi.org/10.1109/EPTC.2013.6745803.
ieee: P. Eichwald et al., “Influences of Bonding Parameters on the Tool Wear
for Copper Wire Bonding,” in 15th Electronics Packaging Technology Conference,
2013.
mla: Eichwald, Paul, et al. “Influences of Bonding Parameters on the Tool Wear for
Copper Wire Bonding.” 15th Electronics Packaging Technology Conference,
2013, doi:10.1109/EPTC.2013.6745803.
short: 'P. Eichwald, W. Sextro, S. Althoff, F. Eacock, M. Schnietz, K. Guth, M.
Brökelmann, in: 15th Electronics Packaging Technology Conference, 2013.'
date_created: 2019-05-13T13:57:49Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1109/EPTC.2013.6745803
language:
- iso: eng
project:
- _id: '92'
grant_number: 02 PQ2210
name: Intelligente Herstellung zuverlässiger Kupferbondverbindungen
publication: 15th Electronics Packaging Technology Conference
status: public
title: Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding
type: conference
user_id: '210'
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: '9807'
abstract:
- lang: eng
text: Recently, focus on maintenance strategies has been shifted towards prognostic
health management (PHM) and a number of state of the art algorithms based on data-driven
prognostics have been developed to predict the health states of degrading components
based on sensory data. Amongst these algorithms, Multiclass Support Vector Machines
(MC-SVM) has gained popularity due to its relatively high classification accuracy,
ability to classify multiple patterns and capability to handle noisy /incomplete
data. However, its application is limited by the difficulty in determining the
required kernel function and penalty parameters. To address this problem, this
paper proposes a hybrid differential evolution -- particle swarm optimization
(DE-PSO) algorithm to optimize the MC-SVM kernel function and penalty parameters.
The differential algorithm (DE) obtains the search limit for the SVM parameters,
while the particle swarm optimization algorithm (PSO) determines the global optimum
parameters for a given training data set. Since degrading machinery components
display several degradation stages in their lifetime, the MC-SVM trained with
optimum parameters are used to estimate the health states of a degrading machinery
component, from which the remaining useful life (RUL) is predicted. This method
improves the classification accuracy of MC-SVM in predicting the health states
of a machinery component and consequently increases the accuracy of RUL predictions.
The feasibility of the method is validated using bearing prognostic run-to-failure
data obtained from NASA public data repository. A comparative study between MC-SVM
with parameters obtained using simple grid search with n-fold cross validation
and MCSVM with DE-PSO based on prognostic performance metrics reveals that the
proposed method has better performance, with all the cases considered falling
within a 10 \% error margin. The method also outperforms other soft computing
methods proposed in literature.
author:
- first_name: James Kuria
full_name: Kimotho, James Kuria
last_name: Kimotho
- first_name: Christopher
full_name: Sondermann-Wölke, Christopher
last_name: Sondermann-Wölke
- first_name: Tobias
full_name: Meyer, Tobias
last_name: Meyer
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Kimotho JK, Sondermann-Wölke C, Meyer T, Sextro W. Machinery Prognostic Method
Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution
-- Particle Swarm Optimization. Chemical Engineering Transactions. 2013;33:619-624.
doi:10.3303/CET1333104
apa: Kimotho, J. K., Sondermann-Wölke, C., Meyer, T., & Sextro, W. (2013). Machinery
Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential
Evolution -- Particle Swarm Optimization. Chemical Engineering Transactions,
33, 619–624. https://doi.org/10.3303/CET1333104
bibtex: '@article{Kimotho_Sondermann-Wölke_Meyer_Sextro_2013, title={Machinery Prognostic
Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution
-- Particle Swarm Optimization}, volume={33}, DOI={10.3303/CET1333104},
journal={Chemical Engineering Transactions}, author={Kimotho, James Kuria and
Sondermann-Wölke, Christopher and Meyer, Tobias and Sextro, Walter}, year={2013},
pages={619–624} }'
chicago: 'Kimotho, James Kuria, Christopher Sondermann-Wölke, Tobias Meyer, and
Walter Sextro. “Machinery Prognostic Method Based on Multi-Class Support Vector
Machines and Hybrid Differential Evolution -- Particle Swarm Optimization.” Chemical
Engineering Transactions 33 (2013): 619–24. https://doi.org/10.3303/CET1333104.'
ieee: J. K. Kimotho, C. Sondermann-Wölke, T. Meyer, and W. Sextro, “Machinery Prognostic
Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution
-- Particle Swarm Optimization,” Chemical Engineering Transactions, vol.
33, pp. 619–624, 2013.
mla: Kimotho, James Kuria, et al. “Machinery Prognostic Method Based on Multi-Class
Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization.”
Chemical Engineering Transactions, vol. 33, 2013, pp. 619–24, doi:10.3303/CET1333104.
short: J.K. Kimotho, C. Sondermann-Wölke, T. Meyer, W. Sextro, Chemical Engineering
Transactions 33 (2013) 619–624.
date_created: 2019-05-13T14:13:26Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
doi: 10.3303/CET1333104
intvolume: ' 33'
language:
- iso: eng
page: 619-624
publication: Chemical Engineering Transactions
status: public
title: Machinery Prognostic Method Based on Multi-Class Support Vector Machines and
Hybrid Differential Evolution -- Particle Swarm Optimization
type: journal_article
user_id: '55222'
volume: 33
year: '2013'
...