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Vibration Control Approaches for the Semi-active Friction

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Abstract:
A semi-active device is presented for vibration control using energy dissipation by dry friction contact surfaces. Interface contact is between the surfaces of the moving mass component and the friction pads positioned on both side of it. To induce friction at the interface, normal forces are applied by piezoelectric stack actuator in order to maintain contact between the moving mass and the friction pads. Numerical and experimental results obtained in open-loop using Coulomb friction model show that there is an optimal constant normal force to maximize the energy dissipated. Two strategies are then proposed to control the normal force: 1) the Lyapunov method leading to the nonlinear bang-bang controller law and 2) the feedback linearization approach equivalent to viscous friction. The implementation of both strategies is presented and both are experimentally assessed using a clamped-free beam with the semi-active device attached to the beam. The experimental control results show the influence of the parameters of the controllers on the energy dissipation and the vibration of the beam. It is shown that proper choice of these parameters leads to increased energy dissipation with respect to the case where the normal force is constant.

Type of Seminar:
Public Seminar
Speaker:
Paulin Buaka
University of Sherbrooke, Quebec, Canada
Date/Time:
May 02, 2005   14:15
Location:

ETH Zentrum, Physikstrasse 3, Building ETL, Room K25
Contact Person:

D. Niederberger
No downloadable files available.
Biographical Sketch:
EDUCATION
2001 – 2004 PhD Student at Acoustic and Vibration Group of the University of Sherbrooke, Quebec, Canada − PhD Thesis: “ Development of a semi-active friction device to reduce vibration of mechanical structures by energy dissipation in dry contact ”.
1998 – 2000 Master degree in Mechanical Engineering at Acoustic and Vibration Group of University of Sherbrooke, Quebec, Canada. − Master thesis: “Modeling, dynamic analysis and control of a biped walking robot.”
1992 – 1996 Bachelor degree in Mechanical Engineering, specializing in electromechanical engineering from the Polytechnic Faculty of University of Kinshasa, Democratic Republic of Congo.
PROFESSIONAL EXPERIENCES
Since 1998 Graduate Research Assistant and Assistant teacher in Vibration and Acoustics Group, Department of Mechanical Engineering, University of Sherbrooke.
1996 – 1998 Graduate Research Assistant and Assistant teacher, Polytechnic Faculty, Department of Mechanical Engineering, University of Kinshasa, D. R. of Congo.
1997 – 1998 Maintenance Engineer at Rank Xerox, Kinshasa, D. R. of Congo.
HONORS
2001 & 2002 Two times Recipient of “Grant institutional” of the Engineering Faculty, University of Kinshasa, Quebec, Canada.
1998 – 2000 Recipient of “Grant of the excellence” of the Fellowship Program for Francophone Countries from the Canadian International Development Agency.
CONFERENCES AND PUBLICATIONS
• Buaka, P., Masson, P. and Micheau, P. “Experimental Validation of a semi-active friction device” in the Proceedings of SPIE 2004 Smart Structures and Materials and Non-destructive Evaluation for Health Monitoring and Diagnostics 2004 (14-18 March, San Diego, California, USA).
• Buaka, P., Masson, P. and Micheau, P. “Development of a semi-active device to reduce vibration by energy dissipation in dry contact : Experimental results on the first prototype” in Proceedings of 6th CanSmart Meeting International Workshop Smart Materials & Structures (16-17 October 2003, Montreal, Quebec, Canada).
• Buaka, P., Masson, P. and Micheau, P. “Development of a semi-active friction device to reduce vibration by energy dissipation: Concept and Design” in the Proceedings of SPIE 2003 Smart Structures and Materials and Non-destructive Evaluation for Health Monitoring and Diagnostics 2003 (3-6 March, San Diego, California, USA).
• Buaka, P., Masson, P. and Micheau, P. “First steps in the development of a semi-active friction device to reduce vibration by energy dissipation” in the Proceedings of the 2nd Canada – US CanSmart Workshop Smart Materials & Structures (10-11 October 2002, Montreal, Quebec, Canada).
• P. Micheau, P. Buaka, P. Bourassa, " Control of the Simplest Walking Model with Lambda Model", T-Tu-E20, 15th World Congress of the IFAC, Barcelona, 21-26 juin, 2002.
• Buaka, P. and Micheau, P. “Dynamic stability analysis of a simplest walking human with the floquet multipliers” in Proceedings of Progress in Motor Control : From Basic Science to Applications (August 15–18, 2001 Montreal, Quebec, Canada).