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TECHNICAL PAPERS

Vibration Mitigation Using Passive Active Tunable (PAT) System: Experimental Aspects

[+] Author and Article Information
N. Sarigul-Klijn1

Department of Mechanical and Aeronautical Engineering, Transportation Noise Control Center (TNCC), University of California, Davis, CA 95616-5294nsarigulklijn@ucdavis.edu

I. Lopez, M. Sarigul-Klijn, D. Karnopp

Department of Mechanical and Aeronautical Engineering, Transportation Noise Control Center (TNCC), University of California, Davis, CA 95616-5294

1

Corresponding author.

J. Vib. Acoust 129(2), 209-216 (Oct 23, 2006) (8 pages) doi:10.1115/1.2424977 History: Received August 30, 2005; Revised October 23, 2006

The objective of this paper is to test and model a single-degree-of-freedom vibration isolation system with a magnetorheological (MR) foam damper under harmonic and random excitations. The results of this research are valuable for understanding the characteristics of the MR foam damper and include the experimental design and results of vibration mitigations for frequency ranges up to 2000Hz. Transmissibility and acceleration hysteresis experiments of the MR foam damper system with different levels of input current are discussed. A simple damper design that eliminates many of the constraints normally associated with fluid filled devices is presented. Constitutive equations of the Bouc–Wen model are used to validate and characterize the MR foam damper. The motion characteristics of the MR foam damper are studied. Experimental results reveal that the mechanical behavior of the MR foam damper is nonlinear and that the field-dependent behavior of MR foam damper is associated with the applied frequency and acceleration amplitude. Experiments demonstrate MR foam damper works well in controlling vibrations and can be controlled and tuned for specific applications.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Design of MRF damper

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Figure 2

Experimental setup and measurement system

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Figure 3

Transmissibility of MRF vibration isolator at coil current of 0A, 0.05A, 0.15A, and 1.35A

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Figure 4

Experimental acceleration hysteresis loops at 5Hz excitation and 2m∕s2 input magnitude

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Figure 5

Experimental acceleration hysteresis loops at 20Hz excitation and 4m∕s2 input magnitude

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Figure 6

Plot of acceleration hysreresis loops at coil current of 0.15A and frequency of 20Hz

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Figure 7

Plot of acceleration hysteresis at coil current of 0.15A, input acceleration of 2m∕s2, and f=5Hz, 10Hz, 20Hz, 50Hz and 100Hz

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Figure 8

Bouc–Wen model of MR damper

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Figure 9

Experimental and simulated acceleration hysteresis loops at 20Hz excitation and 4m∕s2 input magnitude

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Figure 10

SDOF system, Voigt–Kelvin model

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Figure 11

Acceleration transmissibility for various damping coefficients

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Figure 12

Simulated acceleration transmissibility for 0A, 0.35A, 0.15A and 1.35A

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