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Proceedings Paper

A novel tunable mass damper based on giant magnetostrictive composite and piezoelectric ceramic
Author(s): Deyu Li; Siu Wing Or; Chung Sheung Yung; Helen Lai Wa Chan; Ping Kong Choy; Peter Chou Kee Liu
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Paper Abstract

A novel tunable mass damper (TMD) is developed using the sensitivity of transversal bending stiffness and resonance frequencies of a beam to its axial force. This smart TMD consists of a force actuator-sensor unit suspended in a rigid frame by two flexible beams coupled to the axial ends of the unit and the frame. The force actuator-sensor unit is composed of a giant magnetostrictive composite-based force actuator for producing an axial force to the beams and a pair of piezoelectric ceramic-based force sensors for generating a tuning signal. Through adjusting the magnetic field strength applied to the force actuator to change the axial force exerted on the beams, the transversal bending stiffness of the beams and hence the natural frequency of the smart TMD is tuned. In this paper, the design, fabrication, and characterized of the smart TMD is described. The measured resonance frequency of the smart TMD is 65 Hz at zero magnetic tuning field and 50 Hz at an applied magnetic field of 686 Oe. Tunability of the resonance frequency as high as 23 % is achieved with the reasonably low magnetic tuning field. The frequency response functions as measured using the force sensors agree well with those obtained using a commercial accelerometer, indicating a great possibility of directly deploying the force sensors for active or semi-active tuning or control purposes.

Paper Details

Date Published: 16 May 2005
PDF: 9 pages
Proc. SPIE 5760, Smart Structures and Materials 2005: Damping and Isolation, (16 May 2005); doi: 10.1117/12.599566
Show Author Affiliations
Deyu Li, The Hong Kong Polytechnic Univ. (Hong Kong China)
Siu Wing Or, The Hong Kong Polytechnic Univ. (Hong Kong China)
Chung Sheung Yung, The Hong Kong Polytechnic Univ. (Hong Kong China)
Helen Lai Wa Chan, The Hong Kong Polytechnic Univ. (Hong Kong China)
Ping Kong Choy, ASM Assembly Automation Ltd. (Hong Kong China)
Peter Chou Kee Liu, ASM Assembly Automation Ltd. (Hong Kong China)


Published in SPIE Proceedings Vol. 5760:
Smart Structures and Materials 2005: Damping and Isolation
Kon-Well Wang, Editor(s)

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