--- _id: '41970' abstract: - lang: ger text: "Der Transport feiner Pulver mit in der Regel sehr hohen adhäsiven und kohäsiven Eigenschaften stellt für viele konventionelle Transportsysteme eine große Herausforderung dar. Durch die Anwendung von Ultraschallschwingungen können insbesondere die hohen adhäsiven Kontaktkräfte und damit auch die Reibungseigenschaften manipuliert werden.\r\n\r\nEin neu entwickeltes Pulvertransportsystem nutzt Ultraschallschwingungen, um die effektiven Tangentialkräfte im Pulver-Rohrkontakt zu reduzieren. Durch den koordinierten Einsatz von Ultraschallpulsen während einer niederfrequenten harmonischen Axialschwingung des Transportrohres wird ein kontinuierlicher Pulvertransport ermöglicht. Nach einer Einführung in die Grundlagen der Reibung und Reibungsmanipulation von Festkörpern und Pulvern sowie der Charakterisierung von Pulvern wird das Pulvertransportsystem auf Basis der Reibungsmanipulation inklusive der Leistungselektronik und der Ansteuerungshardware vorgestellt. Eine Sensitivitätsanalyse zeigt, dass die Anregungsparameter des Pulvertransportsystems ein großes Optimierungspotential aufweisen. Es wird ein effizientes, modulares Modell des Pulvertransportsystems vorgestellt, welches neben dem eigentlichen Modell des Transportprozesses ein Modell der Rohrschwingung und ein kennlinienbasiertes Modell des Pulver-Rohrkontakts beinhaltet. Mithilfe des Modells des Pulvertransportsystems werden Anregungsparameter hinsichtlich Amplituden und Frequenzen der auftretenden Schwingungen sowie der Schaltzeiten des Ultraschallpulses optimiert. " author: - first_name: Paul full_name: Dunst, Paul id: '22130' last_name: Dunst citation: ama: Dunst P. Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse. Vol 14. Shaker; 2023. apa: Dunst, P. (2023). Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse (Vol. 14). Shaker. bibtex: '@book{Dunst_2023, series={Schriften des Lehrstuhls für Dynamik und Mechatronik}, title={Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse}, volume={14}, publisher={Shaker}, author={Dunst, Paul}, year={2023}, collection={Schriften des Lehrstuhls für Dynamik und Mechatronik} }' chicago: Dunst, Paul. Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse. Vol. 14. Schriften des Lehrstuhls für Dynamik und Mechatronik. Shaker, 2023. ieee: P. Dunst, Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse, vol. 14. Shaker, 2023. mla: Dunst, Paul. Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse. Shaker, 2023. short: P. Dunst, Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse, Shaker, 2023. date_created: 2023-02-10T12:58:42Z date_updated: 2023-02-10T13:07:40Z department: - _id: '151' extern: '1' intvolume: ' 14' jel: - D3 keyword: - Ultraschall - Pulvertransport - Modellierung - Optimierung - Reibung - Adhäsion - Kohäsion - Reibungsmanipulation language: - iso: ger main_file_link: - url: https://katalog.ub.uni-paderborn.de/local/r/9925085666806463?sr[q,any]=paul%20dunst page: '150' publication_identifier: isbn: - "\t978-3-8440-8899-1" publication_status: published publisher: Shaker related_material: link: - relation: confirmation url: https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-8899-1&search=yes series_title: Schriften des Lehrstuhls für Dynamik und Mechatronik status: public supervisor: - first_name: Walter full_name: Sextro, Walter id: '21220' last_name: Sextro title: Modellierung und Optimierung reibungsbasierter Ultraschall-Pulvertransportprozesse type: dissertation user_id: '55222' volume: 14 year: '2023' ... --- _id: '14852' abstract: - lang: eng text: In a variety of industrial applications, liquids are atomized to produce aerosols for further processing. Example applications are the coating of surfaces with paints, the application of ultra-thin adhesive layers and the atomization of fuels for the production of combustible dispersions. In this publication different atomizing principles (standing-wave, capillary-wave, vibrating-mesh) are examined and discussed. Using an optimized standing-wave system, tough liquids with viscosities of up to about 100 Pas could be successfully atomized. author: - first_name: Paul full_name: Dunst, Paul id: '22130' last_name: Dunst - 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: 'Littmann, Walter ' last_name: Littmann - first_name: Walter full_name: Sextro, Walter id: '21220' last_name: Sextro citation: ama: 'Dunst P, Bornmann P, Hemsel T, Littmann W, Sextro W. Atomization of Fluids with Ultrasound. In: Lötters J, Urban G, eds. Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019). Enschede, The Netherlands; 2019:140-143.' apa: Dunst, P., Bornmann, P., Hemsel, T., Littmann, W., & Sextro, W. (2019). Atomization of Fluids with Ultrasound. In J. Lötters & G. Urban (Eds.), Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019) (pp. 140–143). Enschede, The Netherlands. bibtex: '@inproceedings{Dunst_Bornmann_Hemsel_Littmann_Sextro_2019, place={Enschede, The Netherlands}, title={Atomization of Fluids with Ultrasound}, booktitle={Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019)}, author={Dunst, Paul and Bornmann, Peter and Hemsel, Tobias and Littmann, Walter and Sextro, Walter}, editor={Lötters, Joost and Urban, GeraldEditors}, year={2019}, pages={140–143} }' chicago: Dunst, Paul, Peter Bornmann, Tobias Hemsel, Walter Littmann, and Walter Sextro. “Atomization of Fluids with Ultrasound.” In Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019), edited by Joost Lötters and Gerald Urban, 140–43. Enschede, The Netherlands, 2019. ieee: P. Dunst, P. Bornmann, T. Hemsel, W. Littmann, and W. Sextro, “Atomization of Fluids with Ultrasound,” in Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019), Enschede, The Netherlands, 2019, pp. 140–143. mla: Dunst, Paul, et al. “Atomization of Fluids with Ultrasound.” Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019), edited by Joost Lötters and Gerald Urban, 2019, pp. 140–43. short: 'P. Dunst, P. Bornmann, T. Hemsel, W. Littmann, W. Sextro, in: J. Lötters, G. Urban (Eds.), Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019), Enschede, The Netherlands, 2019, pp. 140–143.' conference: end_date: 2019-10-04 location: Enschede, The Netherlands name: 4th Conference on MicroFluidic Handling Systems start_date: 2019-10-02 date_created: 2019-11-07T15:25:30Z date_updated: 2022-01-06T06:52:08Z ddc: - '620' department: - _id: '151' editor: - first_name: Joost full_name: Lötters, Joost last_name: Lötters - first_name: Gerald full_name: Urban, Gerald last_name: Urban file: - access_level: closed content_type: application/pdf creator: pdunst date_created: 2019-11-07T15:22:56Z date_updated: 2019-11-07T15:22:56Z file_id: '14853' file_name: Dunst_MFHS_2019.pdf file_size: 3850591 relation: main_file success: 1 file_date_updated: 2019-11-07T15:22:56Z has_accepted_license: '1' keyword: - atomization - ultrasound - standing-wave - capillarywave - vibrating-mesh language: - iso: eng page: 140-143 place: Enschede, The Netherlands publication: Conference Proceedings - The 4th Conference on MicroFluidic Handling Systems (MFHS2019) publication_status: published quality_controlled: '1' status: public title: Atomization of Fluids with Ultrasound type: conference user_id: '22130' year: '2019' ... --- _id: '10258' abstract: - lang: eng text: Für die Zerstäubung hochviskoser Flüssigkeiten werden neben Düsenzerstäubern vor allem UltraschallStehwellenzerstäuber angewendet [1]. Diese ermöglichen ohne weitere Maßnahmen zwar keine gerichtete Zerstäubung, benötigen jedoch im Gegensatz zu Düsenzerstäubern keine hohen Drücke und haben keine hohen Austrittsgeschwindigkeiten. Zur Erzeugung der Ultraschallwellen werden typischerweise piezoelektrische, mit Bolzen verschraubte LangevinWandler verwendet [1-4], die eine starke Schallabstrahlung bei einer elektrischen Eingangsleistung von bis zu einigen Kilowatt erzeugen können. Wie bei jedem anderen schwingenden System emittiert der Ultraschallwandler zunächst eine Wanderwelle. Mit einem Reflektor, der gegenüber der Sonotrode angeordnet ist, wird eine stehende Welle erzeugt. Im Resonanzabstand zwischen Reflektor und Wandler werden abgestrahlte und reflektierte Wellen so überlagert, dass höhere Schalldruckamplituden erzielt werden. Ein einfacher Ansatz zur Maximierung des Schallpegels im Stehwellenfeld ist die Erhöhung der Schwingungsamplituden des Wandlers, die jedoch zu Schäden oder zumindest zu einer Verringerung der Lebensdauer führen kann. Hohe Schalldrücke werden auch bei geringen Abständen zwischen Wandler und Reflektor erreicht. Das Volumen des Schallfeldes ist in diesem Fall jedoch für die meisten Prozesse zu klein. Ein weiterer Ansatz ist die Verwendung zweier entgegengesetzt angeordneter Wandler [5]. In diesem Fall erfordert jedoch die Erzeugung einer stehenden Welle eine genaue Abstimmung von Frequenz und Phase beider Wandler, was eine komplexe Steuerung erfordert. Ebenso ist es möglich, geometrische Randbedingungen des Stehwellensystems zu optimieren, sodass es zu optimaler Interferenz der Wellen kommt. Im Folgenden wird der Anschaulichkeit halber vereinfachend angenommen, dass der Wandler an seiner Sonotrodenoberfläche einzelne Schallstrahlen aussendet, die in Nähe des Wandlers nahezu parallel verlaufen und sich mit zunehmender Entfernung vom Wandler auffächern. Ein einfaches Stehwellensystem, bestehend aus ebener Sonotrode und ebenem Reflektor, erzeugt bei kleinem Abstand zwischen Sonotrode und Reflektor sehr hohe Schallpegel, da nahezu sämtliche ausgesandten Schallstrahlen in Richtung der Sonotrode reflektiert werden positive Interferenz entsteht. Erhöht man jedoch den Abstand zwischen Sonotrode und Reflektor, so nehmen die Verluste durch Schallstrahlen, die den Prozessraum verlassen, zu. Wie Abbildung 1 gezeigt, werden nur Schallstrahlen, die in etwa parallel zur Rotationsachse verlaufen, zum Wandler zurück reflektiert und tragen zum Stehwellenfeld bei. Die Strahlen haben zudem abhängig vom Abstrahlwinkel unterschiedliche Weglängen. Die Stehwellenbedingung ist demnach nur für Strahlen in der Nähe der Rotationsachse exakt erfüllt. Um dies zu vermeiden, müssen die Geometrien von Wandler und Reflektor optimiert werden. In den folgenden Abschnitten wird zunächst ein Optimierungsansatz vorgestellt. Mithilfe eines FiniteElemente-Modells werden die Auswirkungen einer optimierten Geometrie auf den maximalen Schalldruckpegel untersucht. Ergebnisse werden durch Messungen an einem experimentellen Aufbau eines Stehwellensystems validiert. Es wird gezeigt, wie sich die Optimierung der geometrischen Randbedingungen auf die Zerstäubung hochviskoser Flüssigkeiten auswirkt. 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: Peter full_name: Bornmann, Peter last_name: Bornmann - first_name: 'Walter ' full_name: 'Littmann, Walter ' last_name: Littmann - first_name: Walter full_name: Sextro, Walter id: '21220' last_name: Sextro citation: ama: 'Dunst P, Hemsel T, Bornmann P, Littmann W, Sextro W. Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten. In: DAGA 2019. ; 2019.' apa: Dunst, P., Hemsel, T., Bornmann, P., Littmann, W., & Sextro, W. (2019). Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten. In DAGA 2019. Rostock. bibtex: '@inproceedings{Dunst_Hemsel_Bornmann_Littmann_Sextro_2019, title={Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten}, booktitle={DAGA 2019}, author={Dunst, Paul and Hemsel, Tobias and Bornmann, Peter and Littmann, Walter and Sextro, Walter}, year={2019} }' chicago: Dunst, Paul, Tobias Hemsel, Peter Bornmann, Walter Littmann, and Walter Sextro. “Modellbasierte Und Experimentelle Charakterisierung von Intensiven Ultraschall-Stehwellenfeldern Für Die Zerstäubung Hochviskoser Flüssigkeiten.” In DAGA 2019, 2019. ieee: P. Dunst, T. Hemsel, P. Bornmann, W. Littmann, and W. Sextro, “Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten,” in DAGA 2019, Rostock, 2019. mla: Dunst, Paul, et al. “Modellbasierte Und Experimentelle Charakterisierung von Intensiven Ultraschall-Stehwellenfeldern Für Die Zerstäubung Hochviskoser Flüssigkeiten.” DAGA 2019, 2019. short: 'P. Dunst, T. Hemsel, P. Bornmann, W. Littmann, W. Sextro, in: DAGA 2019, 2019.' conference: end_date: 2019-03-21 location: Rostock name: Deutsche Jahrestagung für Akustik - DAGA 2019 start_date: 2019-03-18 date_created: 2019-06-17T13:01:47Z date_updated: 2022-01-06T06:50:33Z department: - _id: '151' language: - iso: eng publication: DAGA 2019 status: public title: Modellbasierte und experimentelle Charakterisierung von intensiven Ultraschall-Stehwellenfeldern für die Zerstäubung hochviskoser Flüssigkeiten type: conference user_id: '22130' year: '2019' ... --- _id: '9990' abstract: - lang: eng text: The handling of fine powders is an important task in modern production processes. However, as fine powders strongly tend to adhesion and agglomeration, their processing with conventional methods is difficult or impossible. Especially when processing small amounts of highly sensitive fine powders, conventional methods reach their technical limits. In process steps such as dosing, transport, and especially mixing of fine powders new methods are required. Apart from the well-known method of manipulating powder properties by adding chemical additives, this contribution aims at improving the handling of dry fine powders by using vibrations at different frequencies. Modules are presented, which enable the continuous dosing, the homogeneous mixing and the transport of dry fine powders. Finally, these modules are combined for the production of a homogeneous mixture of two dry fine powders. author: - first_name: Paul full_name: Dunst, Paul id: '22130' last_name: Dunst - 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: Littmann, Walter. last_name: Littmann - first_name: Walter full_name: Sextro, Walter id: '21220' last_name: Sextro citation: ama: Dunst P, Bornmann P, Hemsel T, Littmann W, Sextro W. Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders. ACTUATOR 2018; 16th International Conference on New Actuators. 2018:142-145. apa: Dunst, P., Bornmann, P., Hemsel, T., Littmann, W., & Sextro, W. (2018). Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders. ACTUATOR 2018; 16th International Conference on New Actuators, 142–145. bibtex: '@article{Dunst_Bornmann_Hemsel_Littmann_Sextro_2018, title={Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders}, journal={ACTUATOR 2018; 16th International Conference on New Actuators}, author={Dunst, Paul and Bornmann, Peter and Hemsel, Tobias and Littmann, Walter. and Sextro, Walter}, year={2018}, pages={142–145} }' chicago: Dunst, Paul, Peter Bornmann, Tobias Hemsel, Walter. Littmann, and Walter Sextro. “Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders.” ACTUATOR 2018; 16th International Conference on New Actuators, 2018, 142–45. ieee: P. Dunst, P. Bornmann, T. Hemsel, W. Littmann, and W. Sextro, “Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders,” ACTUATOR 2018; 16th International Conference on New Actuators, pp. 142–145, 2018. mla: Dunst, Paul, et al. “Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders.” ACTUATOR 2018; 16th International Conference on New Actuators, 2018, pp. 142–45. short: P. Dunst, P. Bornmann, T. Hemsel, W. Littmann, W. Sextro, ACTUATOR 2018; 16th International Conference on New Actuators (2018) 142–145. date_created: 2019-05-27T10:13:10Z date_updated: 2019-09-16T09:45:13Z department: - _id: '151' language: - iso: eng page: 142-145 publication: ACTUATOR 2018; 16th International Conference on New Actuators quality_controlled: '1' status: public title: Vibration Assisted Dosing, Mixing and Transport of Dry Fine Powders type: journal_article user_id: '55222' year: '2018' ... --- _id: '9991' abstract: - lang: eng text: Abstract:Since fine powders tend strongly to adhesion and agglomeration, their processing withconventional methods is difficult or impossible. Typically, in order to enable the handling of finepowders, chemicals are added to increase the flowability and reduce adhesion. This contributionshows that instead of additives also vibrations can be used to increase the flowability, to reduceadhesion and cohesion, and thus to enable or improve processes such as precision dosing, mixing,and transport of very fine powders. The methods for manipulating powder properties are describedin detail and prototypes for experimental studies are presented. It is shown that the handling of finepowders can be improved by using low-frequency, high-frequency or a combination of low- andhigh-frequency vibration. author: - first_name: Paul full_name: Dunst, Paul id: '22130' last_name: Dunst - 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 citation: ama: Dunst P, Bornmann P, Hemsel T, Sextro W. Vibration-Assisted Handling of Dry Fine Powders. Actuators 2018, 7(2). 2018:1-11. doi:10.3390/act7020018 apa: Dunst, P., Bornmann, P., Hemsel, T., & Sextro, W. (2018). Vibration-Assisted Handling of Dry Fine Powders. Actuators 2018, 7(2)., 1–11. https://doi.org/10.3390/act7020018 bibtex: '@article{Dunst_Bornmann_Hemsel_Sextro_2018, title={Vibration-Assisted Handling of Dry Fine Powders}, DOI={10.3390/act7020018}, journal={Actuators 2018, 7(2).}, author={Dunst, Paul and Bornmann, Peter and Hemsel, Tobias and Sextro, Walter}, year={2018}, pages={1–11} }' chicago: Dunst, Paul, Peter Bornmann, Tobias Hemsel, and Walter Sextro. “Vibration-Assisted Handling of Dry Fine Powders.” Actuators 2018, 7(2)., 2018, 1–11. https://doi.org/10.3390/act7020018. ieee: P. Dunst, P. Bornmann, T. Hemsel, and W. Sextro, “Vibration-Assisted Handling of Dry Fine Powders,” Actuators 2018, 7(2)., pp. 1–11, 2018. mla: Dunst, Paul, et al. “Vibration-Assisted Handling of Dry Fine Powders.” Actuators 2018, 7(2)., 2018, pp. 1–11, doi:10.3390/act7020018. short: P. Dunst, P. Bornmann, T. Hemsel, W. Sextro, Actuators 2018, 7(2). (2018) 1–11. date_created: 2019-05-27T10:16:16Z date_updated: 2019-09-16T09:44:54Z department: - _id: '151' doi: 10.3390/act7020018 keyword: - powder handling - flowability - dosing - transport - mixing - dispersion - piezoelectricactuators - vibrations language: - iso: eng page: 1-11 publication: Actuators 2018, 7(2). quality_controlled: '1' status: public title: Vibration-Assisted Handling of Dry Fine Powders type: journal_article user_id: '55222' year: '2018' ... --- _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. elsevier. 2017;Sensors and Actuators A 263:733-736. apa: Dunst, P., Hemsel, T., & Sextro, W. (2017). Analysis of pipe vibration in an ultrasonic powder transportationsystem. Elsevier, Sensors and Actuators A 263, 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.” Elsevier 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,” elsevier, vol. Sensors and Actuators A 263, pp. 733–736, 2017. mla: Dunst, Paul, et al. “Analysis of Pipe Vibration in an Ultrasonic Powder Transportationsystem.” Elsevier, 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: '9958' abstract: - lang: eng text: The transportation of dry fine powders is an emerging technologic task, as in biotechnology, pharmaceutical or coatings industry particle sizes of processed powders are getting smaller and smaller. Fine powders are primarily defined by the fact that adhesive and cohesive forces outweigh the weight forces. This leads to mostly unwanted agglomeration (clumping) and adhesion to surfaces, what makes it more difficult to use conventional conveyor systems (e. g. pneumatic or vibratory conveyors) for transport. A rather new method for transporting these fine powders is based on ultrasonic vibrations, which are used to reduce friction and adhesion between powder and the substrate. One very effective set-up consists of a pipe, which vibrates harmoniously in axial direction at low frequency combined with a pulsed radial high frequency vibration. The high frequency vibration accelerates the particles perpendicular to the surface of the pipe, which in average leads to lower normal and thereby smaller friction force. With coordinated friction manipulation the powder acceleration can be varied so that the powder may be greatly accelerated and only slightly decelerated in each excitation period of the low frequency axial vibration of the pipe. The amount of powder flow is adjustable by vibration amplitudes, frequencies, and pulse rate, which makes the device versatile for comparable high volume and fine dosing using one setup. Within this contribution an experimental set-up consisting of a pipe, a solenoid actuator for axial vibration and a piezoelectric actuator for the radial high frequency vibration is described. An analytical model is shown, that simulates the powder velocity. Finally, simulation results are validated by experimental data for different driving parameters such as amplitude of low frequency vibration, pipe material and inclination angle. author: - first_name: Paul full_name: Dunst, Paul id: '22130' last_name: Dunst - first_name: Walter full_name: Sextro, Walter id: '21220' last_name: Sextro - 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: Littmann, Walter last_name: Littmann citation: ama: 'Dunst P, Sextro W, Bornmann P, Hemsel T, Littmann W. Transportation of dry fine powders by coordinated friction manipulation. In: PAMM Proc. Appl. Math. Mech. 16. Braunschweig; 2016:635-636. doi:10.1002/pamm.201610306' apa: Dunst, P., Sextro, W., Bornmann, P., Hemsel, T., & Littmann, W. (2016). Transportation of dry fine powders by coordinated friction manipulation. In PAMM Proc. Appl. Math. Mech. 16 (pp. 635–636). Braunschweig. https://doi.org/10.1002/pamm.201610306 bibtex: '@inproceedings{Dunst_Sextro_Bornmann_Hemsel_Littmann_2016, place={Braunschweig}, title={Transportation of dry fine powders by coordinated friction manipulation}, DOI={10.1002/pamm.201610306}, booktitle={PAMM Proc. Appl. Math. Mech. 16}, author={Dunst, Paul and Sextro, Walter and Bornmann, Peter and Hemsel, Tobias and Littmann, Walter}, year={2016}, pages={635–636} }' chicago: Dunst, Paul, Walter Sextro, Peter Bornmann, Tobias Hemsel, and Walter Littmann. “Transportation of Dry Fine Powders by Coordinated Friction Manipulation.” In PAMM Proc. Appl. Math. Mech. 16, 635–36. Braunschweig, 2016. https://doi.org/10.1002/pamm.201610306. ieee: P. Dunst, W. Sextro, P. Bornmann, T. Hemsel, and W. Littmann, “Transportation of dry fine powders by coordinated friction manipulation,” in PAMM Proc. Appl. Math. Mech. 16, 2016, pp. 635–636. mla: Dunst, Paul, et al. “Transportation of Dry Fine Powders by Coordinated Friction Manipulation.” PAMM Proc. Appl. Math. Mech. 16, 2016, pp. 635–36, doi:10.1002/pamm.201610306. short: 'P. Dunst, W. Sextro, P. Bornmann, T. Hemsel, W. Littmann, in: PAMM Proc. Appl. Math. Mech. 16, Braunschweig, 2016, pp. 635–636.' date_created: 2019-05-27T08:57:25Z date_updated: 2019-05-27T08:59:25Z department: - _id: '151' doi: 10.1002/pamm.201610306 language: - iso: eng page: 635-636 place: Braunschweig publication: PAMM Proc. Appl. Math. Mech. 16 status: public title: Transportation of dry fine powders by coordinated friction manipulation type: conference user_id: '55222' year: '2016' ...