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Test stand for anisotropic friction coefficients of a friction layer of 2D-carbon fiber arrays used in piezo motors

Carrasco, Alvaro G. and Baghshetsyan, Armen and Pott, P. P. and Schlaak, Helmut F. (2014):
Test stand for anisotropic friction coefficients of a friction layer of 2D-carbon fiber arrays used in piezo motors.
In: International Conference on New Actutors, 14, In: ACTUATOR 2014 - International Conference and Exhibition on New Actuators and Drive Systems, Bremen, In: Actuator 2014, International Conference and Exhibition on new Actuators and Drive Systems, Bremen, 23. - 25. Juni 2014, pp. 659-662, [Conference or Workshop Item]

Abstract

with an inclination of 45° and fiber length of 1,5 mm were assessed. The fiber arrays with about 12000 fibers (2,3 x 0,3 mm²) are dynamically and perpendicularly pressed against a contact surface with frequencies up to 200 Hz and 100 μm stroke. A 3D piezoelectric force sensor at the base of the fibers is used to measure the load applied. The contact surface is a metallic beam supported horizontally by membrane springs fixed at both ends. Hereby, the normal force applied to the fibers is split by the contact in two force components at the beam surface: normal and tangential. The membrane springs provide a large stiffness in normal direction and very low stiffness in tangential direction at this configuration. Due to the resulting friction and the bending of the fibers, a displacement of the beam is achieved in the tangential direction. As the mass of the beam is well known, the tangential force transferred to the beam is mathematically deduced from the measurement of the velocity of the beam’s motion. This is performed by a laser vibrometer. Thanks to the 3D force sensor statements regarding the friction coefficient during the bending of the fibers can be determined. The measurements deliver a friction coefficient of about 0,6. This has a direct dependency with the stiffness of the membrane springs. They were oversized for a resonance frequency greater than 200 Hz, as a linear deflection of the springs was targeted. Due to this new test stand it is now possible to measure the reaction forces out of the interaction between a 2D carbon fiber array and a contact surface. In order to minimize the influence of non-linear behaviour of the membrane springs to the measurement, they were intentionally oversized. This requires greater forces and respectively more fibers. Nevertheless, the bending behaviour of the fibers can now be characterised by the presented measurement method. Further studies will determine the optimal fiber length, or the optimal deflection range of the fibers. This can now be accomplished by models validated on the described test stand. Also further investigations are required to enhance the coupling of the fibers to the contact surface.

Item Type: Conference or Workshop Item
Erschienen: 2014
Creators: Carrasco, Alvaro G. and Baghshetsyan, Armen and Pott, P. P. and Schlaak, Helmut F.
Title: Test stand for anisotropic friction coefficients of a friction layer of 2D-carbon fiber arrays used in piezo motors
Language: English
Abstract:

with an inclination of 45° and fiber length of 1,5 mm were assessed. The fiber arrays with about 12000 fibers (2,3 x 0,3 mm²) are dynamically and perpendicularly pressed against a contact surface with frequencies up to 200 Hz and 100 μm stroke. A 3D piezoelectric force sensor at the base of the fibers is used to measure the load applied. The contact surface is a metallic beam supported horizontally by membrane springs fixed at both ends. Hereby, the normal force applied to the fibers is split by the contact in two force components at the beam surface: normal and tangential. The membrane springs provide a large stiffness in normal direction and very low stiffness in tangential direction at this configuration. Due to the resulting friction and the bending of the fibers, a displacement of the beam is achieved in the tangential direction. As the mass of the beam is well known, the tangential force transferred to the beam is mathematically deduced from the measurement of the velocity of the beam’s motion. This is performed by a laser vibrometer. Thanks to the 3D force sensor statements regarding the friction coefficient during the bending of the fibers can be determined. The measurements deliver a friction coefficient of about 0,6. This has a direct dependency with the stiffness of the membrane springs. They were oversized for a resonance frequency greater than 200 Hz, as a linear deflection of the springs was targeted. Due to this new test stand it is now possible to measure the reaction forces out of the interaction between a 2D carbon fiber array and a contact surface. In order to minimize the influence of non-linear behaviour of the membrane springs to the measurement, they were intentionally oversized. This requires greater forces and respectively more fibers. Nevertheless, the bending behaviour of the fibers can now be characterised by the presented measurement method. Further studies will determine the optimal fiber length, or the optimal deflection range of the fibers. This can now be accomplished by models validated on the described test stand. Also further investigations are required to enhance the coupling of the fibers to the contact surface.

Title of Book: ACTUATOR 2014 - International Conference and Exhibition on New Actuators and Drive Systems
Series Name: International Conference on New Actutors
Volume: 14
Place of Publication: Bremen
Uncontrolled Keywords: Cilia based piezoelectric actuator, piezo actuator, Array, Carbon Fibers, micro structures
Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Microtechnology and Electromechanical Systems
Event Title: Actuator 2014, International Conference and Exhibition on new Actuators and Drive Systems
Event Location: Bremen
Event Dates: 23. - 25. Juni 2014
Date Deposited: 13 Oct 2014 08:59
Identification Number: P60
Alternative keywords:
Alternative keywordsLanguage
Wimpernantrieb, Kohlefaser, Piezoaktor, Array, MikrostrukturenEnglish
Projects: Wimpernantrieb
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