---
_id: '10334'
abstract:
- lang: eng
  text: Ultrasonic joining is a common industrial process. In the electronics industry
    it is used to form electrical connections, including those of dissimilar materials.
    Multiple influencing factors in ultrasonic joining are known and extensively investigated;
    process parameters like ultrasonic power, bond force, and bonding frequency of
    the ultrasonic vibration are known to have a high impact on a reliable joining
    process and need to be adapted for each new application with different geometry
    or materials. This contribution is focused on increasing ultrasonic power transmitted
    to the interface and keeping mechanical stresses during ultrasonic bonding low
    by using a multi-dimensional ultrasonic transducer concept. Bonding results for
    a new designed connector pin in IGBT-modules achieved by multi- and one-dimensional
    bonding are discussed.
author:
- first_name: Reinhard
  full_name: Schemmel, Reinhard
  id: '28647'
  last_name: Schemmel
- first_name: Tobias
  full_name: Hemsel, Tobias
  id: '210'
  last_name: Hemsel
- first_name: Collin
  full_name: Dymel, Collin
  id: '66833'
  last_name: Dymel
- first_name: Matthias
  full_name: Hunstig, Matthias
  last_name: Hunstig
- first_name: Michael
  full_name: Brökelmann, Michael
  last_name: Brökelmann
- first_name: Walter
  full_name: Sextro, Walter
  id: '21220'
  last_name: Sextro
citation:
  ama: 'Schemmel R, Hemsel T, Dymel C, Hunstig M, Brökelmann M, Sextro W. Using complex
    multi-dimensional vibration trajectories in ultrasonic bonding and welding. <i>Sensors
    and Actuators A: Physical</i>. 2019;295:653-662. doi:<a href="https://doi.org/10.1016/j.sna.2019.04.025">10.1016/j.sna.2019.04.025</a>'
  apa: 'Schemmel, R., Hemsel, T., Dymel, C., Hunstig, M., Brökelmann, M., &#38; Sextro,
    W. (2019). Using complex multi-dimensional vibration trajectories in ultrasonic
    bonding and welding. <i>Sensors and Actuators A: Physical</i>, <i>295</i>, 653–662.
    <a href="https://doi.org/10.1016/j.sna.2019.04.025">https://doi.org/10.1016/j.sna.2019.04.025</a>'
  bibtex: '@article{Schemmel_Hemsel_Dymel_Hunstig_Brökelmann_Sextro_2019, title={Using
    complex multi-dimensional vibration trajectories in ultrasonic bonding and welding},
    volume={295}, DOI={<a href="https://doi.org/10.1016/j.sna.2019.04.025">10.1016/j.sna.2019.04.025</a>},
    journal={Sensors and Actuators A: Physical}, author={Schemmel, Reinhard and Hemsel,
    Tobias and Dymel, Collin and Hunstig, Matthias and Brökelmann, Michael and Sextro,
    Walter}, year={2019}, pages={653–662} }'
  chicago: 'Schemmel, Reinhard, Tobias Hemsel, Collin Dymel, Matthias Hunstig, Michael
    Brökelmann, and Walter Sextro. “Using Complex Multi-Dimensional Vibration Trajectories
    in Ultrasonic Bonding and Welding.” <i>Sensors and Actuators A: Physical</i> 295
    (2019): 653–62. <a href="https://doi.org/10.1016/j.sna.2019.04.025">https://doi.org/10.1016/j.sna.2019.04.025</a>.'
  ieee: 'R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, and W. Sextro,
    “Using complex multi-dimensional vibration trajectories in ultrasonic bonding
    and welding,” <i>Sensors and Actuators A: Physical</i>, vol. 295, pp. 653–662,
    2019, doi: <a href="https://doi.org/10.1016/j.sna.2019.04.025">10.1016/j.sna.2019.04.025</a>.'
  mla: 'Schemmel, Reinhard, et al. “Using Complex Multi-Dimensional Vibration Trajectories
    in Ultrasonic Bonding and Welding.” <i>Sensors and Actuators A: Physical</i>,
    vol. 295, 2019, pp. 653–62, doi:<a href="https://doi.org/10.1016/j.sna.2019.04.025">10.1016/j.sna.2019.04.025</a>.'
  short: 'R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, W. Sextro,
    Sensors and Actuators A: Physical 295 (2019) 653–662.'
date_created: 2019-07-01T07:32:07Z
date_updated: 2023-09-21T14:12:15Z
department:
- _id: '151'
doi: 10.1016/j.sna.2019.04.025
intvolume: '       295'
keyword:
- Ultrasonic bonding
- Ultrasonic welding
- Multi-dimensional bonding
- Complex vibration
- Multi-frequent
- Two-dimensional friction model
language:
- iso: eng
page: 653 - 662
project:
- _id: '93'
  grant_number: MP-1-1-015
  name: Hochleistungsbonden in energieeffizienten Leistungshalbleitermodulen
publication: 'Sensors and Actuators A: Physical'
publication_identifier:
  issn:
  - 0924-4247
quality_controlled: '1'
status: public
title: Using complex multi-dimensional vibration trajectories in ultrasonic bonding
  and welding
type: journal_article
user_id: '210'
volume: 295
year: '2019'
...
---
_id: '9972'
abstract:
- lang: eng
  text: The transportation of dry fine powders is an emerging technologic task, as
    in biotechnology, pharmaceu-tical and coatings industry the particle sizes of
    processed powders get smaller and smaller. Fine powdersare primarily defined by
    the fact that adhesive and cohesive forces outweigh the weight forces, leadingto
    mostly unwanted agglomeration (clumping) and adhesion to surfaces. Thereby it
    gets more difficult touse conventional conveyor systems (e.g. pneumatic or vibratory
    conveyors) for transport. A rather newmethod for transporting these fine powders
    is based on ultrasonic vibrations, which are used to reducefriction between powder
    and substrate. Within this contribution an experimental set-up consisting of apipe,
    a solenoid actuator for axial vibration and an annular piezoelectric actuator
    for the high frequencyradial vibration of the pipe is described. Since amplitudes
    of the radial pipe vibration should be as large aspossible to get high effects
    of friction reduction, the pipe is excited to vibrate in resonance. To determinethe
    optimum excitation frequency and actuator position the vibration modes and resonance
    frequenciesof the pipe are calculated and measured. Results are in good accordance.
author:
- first_name: Paul
  full_name: Dunst, Paul
  id: '22130'
  last_name: Dunst
- 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: Dunst P, Hemsel T, Sextro W. Analysis of pipe vibration in an ultrasonic powder
    transportationsystem. <i>elsevier</i>. 2017;Sensors and Actuators A 263:733-736.
  apa: Dunst, P., Hemsel, T., &#38; Sextro, W. (2017). Analysis of pipe vibration
    in an ultrasonic powder transportationsystem. <i>Elsevier</i>, <i>Sensors and
    Actuators A 263</i>, 733–736.
  bibtex: '@article{Dunst_Hemsel_Sextro_2017, title={Analysis of pipe vibration in
    an ultrasonic powder transportationsystem}, volume={Sensors and Actuators A 263},
    journal={elsevier}, author={Dunst, Paul and Hemsel, Tobias and Sextro, Walter},
    year={2017}, pages={733–736} }'
  chicago: 'Dunst, Paul, Tobias Hemsel, and Walter Sextro. “Analysis of Pipe Vibration
    in an Ultrasonic Powder Transportationsystem.” <i>Elsevier</i> Sensors and Actuators
    A 263 (2017): 733–36.'
  ieee: P. Dunst, T. Hemsel, and W. Sextro, “Analysis of pipe vibration in an ultrasonic
    powder transportationsystem,” <i>elsevier</i>, vol. Sensors and Actuators A 263,
    pp. 733–736, 2017.
  mla: Dunst, Paul, et al. “Analysis of Pipe Vibration in an Ultrasonic Powder Transportationsystem.”
    <i>Elsevier</i>, vol. Sensors and Actuators A 263, 2017, pp. 733–36.
  short: P. Dunst, T. Hemsel, W. Sextro, Elsevier Sensors and Actuators A 263 (2017)
    733–736.
date_created: 2019-05-27T09:31:13Z
date_updated: 2019-09-16T10:23:40Z
department:
- _id: '151'
keyword:
- Powder transport Piezoelectrics Ultrasonics Pipe vibration Finite element simulation
  Fine powder
language:
- iso: eng
page: 733-736
publication: elsevier
quality_controlled: '1'
status: public
title: Analysis of pipe vibration in an ultrasonic powder transportationsystem
type: journal_article
user_id: '55222'
volume: Sensors and Actuators A 263
year: '2017'
...
---
_id: '9952'
abstract:
- lang: eng
  text: The contact between viscoelastic materials e.g. elastomers and a rough surface
    leads to a special friction characteristic, which differs greatly in its properties
    comparing to other materials like metals. In practice, this friction combination
    occurs for example in the tire-road contact, or in the use of rubber gaskets.
    Due to the frictional forces a system is significantly influenced in its vibrational
    properties. The friction force is composed of two main components adhesion and
    hysteresis. The adhesion results from molecular bounds between the contact partners,
    while the deformation of the viscoelastic material by the roughness of the counter
    body leads to power loss. This internal friction results in an additional frictional
    force, which is described by the hysteresis. To simulate the frictional behaviour
    of elastomers on rough surfaces and thus to determine the energy dissipation in
    contact, it is necessary to develop a mechanical model which considers the roughness
    of the contact partners, as well as dynamic effects and the dependence on normal
    pressure and sliding speed. The viscoelastic material behaviour must also be considered.
    The contact between two rough surfaces is modelled as a rough rigid layer contacting
    a rough elas- tic layer. The elastic layer is modelled by point masses connected
    by Maxwell-elements. This allows the viscoelastic properties of the elastomer
    to be considered. The behaviour of whole system can be described by equations
    of motion with integrated constraints. The degrees of freedom of the model depends
    on the varying contact conditions. A point mass not in contact has two degrees
    of freedom. A point mass in contact moving along the roughness path can be described
    by only one degree of freedom. For each Maxwell-Element also an inner coordinate
    and thus a further degree of freedom is needed. Because of varying contact conditions
    dur- ing the simulation, the simulation interrupts in case the contact conditions
    change. Then the equations of motions are adapted with respect to the contact
    constraints. As a result of the simulation one obtain the energy dissipation and
    thus the friction char- acteristic during the friction process. It is possible
    to use these results in three dimensional point-contact elements in order to model
    contact surfaces on lager length scales.
author:
- first_name: Frank
  full_name: Schulte, Frank
  last_name: Schulte
- first_name: Jan
  full_name: Neuhaus, Jan
  last_name: Neuhaus
- first_name: Walter
  full_name: Sextro, Walter
  id: '21220'
  last_name: Sextro
citation:
  ama: 'Schulte F, Neuhaus J, Sextro W. A Mechanical Model for the Dynamical Contact
    of Elastic Rough Bodies with Viscoelastic Properties. In: <i>Proceedings of ICoEV
    2015 International Conference on Engineering Vibration</i>. ; 2015:1109-1117.'
  apa: Schulte, F., Neuhaus, J., &#38; Sextro, W. (2015). A Mechanical Model for the
    Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties. In <i>Proceedings
    of ICoEV 2015 International Conference on Engineering Vibration</i> (pp. 1109–1117).
  bibtex: '@inproceedings{Schulte_Neuhaus_Sextro_2015, title={A Mechanical Model for
    the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties}, booktitle={Proceedings
    of ICoEV 2015 International Conference on Engineering Vibration}, author={Schulte,
    Frank and Neuhaus, Jan and Sextro, Walter}, year={2015}, pages={1109–1117} }'
  chicago: Schulte, Frank, Jan Neuhaus, and Walter Sextro. “A Mechanical Model for
    the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties.” In
    <i>Proceedings of ICoEV 2015 International Conference on Engineering Vibration</i>,
    1109–17, 2015.
  ieee: F. Schulte, J. Neuhaus, and W. Sextro, “A Mechanical Model for the Dynamical
    Contact of Elastic Rough Bodies with Viscoelastic Properties,” in <i>Proceedings
    of ICoEV 2015 International Conference on Engineering Vibration</i>, 2015, pp.
    1109–1117.
  mla: Schulte, Frank, et al. “A Mechanical Model for the Dynamical Contact of Elastic
    Rough Bodies with Viscoelastic Properties.” <i>Proceedings of ICoEV 2015 International
    Conference on Engineering Vibration</i>, 2015, pp. 1109–17.
  short: 'F. Schulte, J. Neuhaus, W. Sextro, in: Proceedings of ICoEV 2015 International
    Conference on Engineering Vibration, 2015, pp. 1109–1117.'
date_created: 2019-05-27T08:37:22Z
date_updated: 2019-09-16T10:47:53Z
department:
- _id: '151'
keyword:
- Contact Mechanics
- Viscoelastic Material
- Adhesive Friction
- Hysteresis Friction
- Energy Dissipation
- Vibration
language:
- iso: eng
page: 1109-1117
publication: Proceedings of ICoEV 2015 International Conference on Engineering Vibration
quality_controlled: '1'
status: public
title: A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic
  Properties
type: conference
user_id: '55222'
year: '2015'
...
---
_id: '9535'
author:
- first_name: Alexander
  full_name: Genzo, Alexander
  last_name: Genzo
- first_name: Walter
  full_name: Sextro, Walter
  id: '21220'
  last_name: Sextro
citation:
  ama: 'Genzo A, Sextro W. Dynamic Behaviour of Elastic Bodies Coupled by Extended
    Friction Contacts. In: <i>Proceedings of ISMA - International Conference on Noise
    and Vibration Engineering</i>. ; 2006:51-52.'
  apa: Genzo, A., &#38; Sextro, W. (2006). Dynamic Behaviour of Elastic Bodies Coupled
    by Extended Friction Contacts. In <i>Proceedings of ISMA - International conference
    on noise and vibration engineering</i> (pp. 51–52).
  bibtex: '@inproceedings{Genzo_Sextro_2006, title={Dynamic Behaviour of Elastic Bodies
    Coupled by Extended Friction Contacts}, booktitle={Proceedings of ISMA - International
    conference on noise and vibration engineering}, author={Genzo, Alexander and Sextro,
    Walter}, year={2006}, pages={51–52} }'
  chicago: Genzo, Alexander, and Walter Sextro. “Dynamic Behaviour of Elastic Bodies
    Coupled by Extended Friction Contacts.” In <i>Proceedings of ISMA - International
    Conference on Noise and Vibration Engineering</i>, 51–52, 2006.
  ieee: A. Genzo and W. Sextro, “Dynamic Behaviour of Elastic Bodies Coupled by Extended
    Friction Contacts,” in <i>Proceedings of ISMA - International conference on noise
    and vibration engineering</i>, 2006, pp. 51–52.
  mla: Genzo, Alexander, and Walter Sextro. “Dynamic Behaviour of Elastic Bodies Coupled
    by Extended Friction Contacts.” <i>Proceedings of ISMA - International Conference
    on Noise and Vibration Engineering</i>, 2006, pp. 51–52.
  short: 'A. Genzo, W. Sextro, in: Proceedings of ISMA - International Conference
    on Noise and Vibration Engineering, 2006, pp. 51–52.'
date_created: 2019-04-29T08:54:27Z
date_updated: 2022-01-06T07:04:16Z
department:
- _id: '151'
keyword:
- Noise
- Vibration engineering
language:
- iso: eng
page: 51-52
publication: Proceedings of ISMA - International conference on noise and vibration
  engineering
status: public
title: Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts
type: conference
user_id: '55222'
year: '2006'
...
---
_id: '8941'
abstract:
- lang: eng
  text: Numerical predictions of the forced vibration of a disc assembly including
    frictional effects between the shrouds are presented concerning engineering needs
    for the blade design process. Assuming a tuned disc assembly, numerical static,
    free and then forced vibration analyses of a shrouded turbine blade measured in
    the spin pit are performed systematically. For the excitation forces of an air
    jet evaluated from the fairly linear behavior of the experimental blade resonance
    peaks, the reliability of the proposed approach is validated through the very
    close agreement of the computed and measured resonant peaks. These resonant peaks
    demonstrate either a fairly linear behavior or a non-linear one like the jump
    effect of blade resonance amplitudes, or elastic impacts between the shrouds.
    Also, the damping performance for different contact configurations between the
    shrouds is numerically analyzed. These numerical results indicate that the shrouds
    generate higher frictional damping for small angles (0--30 deg) between the circumferential
    direction and the normal vector to the contact surface. Copyright {\copyright}
    2003 by ASME
author:
- first_name: J
  full_name: Szwedowicz, J
  last_name: Szwedowicz
- first_name: Walter
  full_name: Sextro, Walter
  id: '21220'
  last_name: Sextro
- first_name: R
  full_name: Visser, R
  last_name: Visser
- first_name: P.A
  full_name: Masserey, P.A
  last_name: Masserey
citation:
  ama: 'Szwedowicz J, Sextro W, Visser R, Masserey P. On forced vibration of shrouded
    turbine blades. In: <i>ASME Turbo Expo 2003, Collocated with the 2003 International
    Joint Power Generation Conference</i>. Atlanta, Georgia, USA; 2003. doi:<a href="https://doi.org/doi:10.1115/GT2003-38808">doi:10.1115/GT2003-38808</a>'
  apa: Szwedowicz, J., Sextro, W., Visser, R., &#38; Masserey, P. . (2003). On forced
    vibration of shrouded turbine blades. In <i>ASME Turbo Expo 2003, collocated with
    the 2003 International Joint Power Generation Conference</i>. Atlanta, Georgia,
    USA. <a href="https://doi.org/doi:10.1115/GT2003-38808">https://doi.org/doi:10.1115/GT2003-38808</a>
  bibtex: '@inproceedings{Szwedowicz_Sextro_Visser_Masserey_2003, place={Atlanta,
    Georgia, USA}, title={On forced vibration of shrouded turbine blades}, DOI={<a
    href="https://doi.org/doi:10.1115/GT2003-38808">doi:10.1115/GT2003-38808</a>},
    number={GT2003-38808}, booktitle={ASME Turbo Expo 2003, collocated with the 2003
    International Joint Power Generation Conference}, author={Szwedowicz, J and Sextro,
    Walter and Visser, R and Masserey, P.A}, year={2003} }'
  chicago: Szwedowicz, J, Walter Sextro, R Visser, and P.A Masserey. “On Forced Vibration
    of Shrouded Turbine Blades.” In <i>ASME Turbo Expo 2003, Collocated with the 2003
    International Joint Power Generation Conference</i>. Atlanta, Georgia, USA, 2003.
    <a href="https://doi.org/doi:10.1115/GT2003-38808">https://doi.org/doi:10.1115/GT2003-38808</a>.
  ieee: J. Szwedowicz, W. Sextro, R. Visser, and P. . Masserey, “On forced vibration
    of shrouded turbine blades,” in <i>ASME Turbo Expo 2003, collocated with the 2003
    International Joint Power Generation Conference</i>, 2003, no. GT2003-38808.
  mla: Szwedowicz, J., et al. “On Forced Vibration of Shrouded Turbine Blades.” <i>ASME
    Turbo Expo 2003, Collocated with the 2003 International Joint Power Generation
    Conference</i>, no. GT2003-38808, 2003, doi:<a href="https://doi.org/doi:10.1115/GT2003-38808">doi:10.1115/GT2003-38808</a>.
  short: 'J. Szwedowicz, W. Sextro, R. Visser, P.. Masserey, in: ASME Turbo Expo 2003,
    Collocated with the 2003 International Joint Power Generation Conference, Atlanta,
    Georgia, USA, 2003.'
date_created: 2019-04-15T10:44:50Z
date_updated: 2022-01-06T07:04:05Z
department:
- _id: '151'
doi: doi:10.1115/GT2003-38808
issue: GT2003-38808
keyword:
- Turbine blades
- Vibration
language:
- iso: eng
place: Atlanta, Georgia, USA
publication: ASME Turbo Expo 2003, collocated with the 2003 International Joint Power
  Generation Conference
publication_identifier:
  eisbn:
  - 0-7918-3671-1
  isbn:
  - 0-7918-3687-8
status: public
title: On forced vibration of shrouded turbine blades
type: conference
user_id: '55222'
year: '2003'
...