Experimental Robustness Analysis of Magneto-Rheological Tuned Vibration Absorbers Subject to Mass Off-Tuning

[+] Author and Article Information
Jeong-Hoi Koo1

Department of Mechanical and Manufacturing Engineering,  Miami University, Oxford, OH 45056koo@muohio.edu

Mehdi Ahmadian

 Center for Vehicle Systems and Safety Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061-0238ahmadian@vt.edu

Mehdi Setareh

College of Architecture and Urban Studies,  Virginia Tech, Blacksburg, VA 24060–0205setareh@vt.edu


Corresponding author.

J. Vib. Acoust 128(1), 126-131 (May 24, 2005) (6 pages) doi:10.1115/1.2128647 History: Received April 08, 2004; Revised May 24, 2005

This paper offers an experimental robustness analysis of a semi-active tuned vibration absorber (TVA) subject to structural mass off-tuning, which occurs frequently in practical applications of TVAs. One of the critical problems of a conventional TVA is off-tuning or miss-tuning because off-tuned TVAs may amplify the vibrations of the primary structure. This study intends to evaluate how well semi-active TVAs are able to adapt to structural mass changes (mass off-tuning) as compared with passive TVAs. To this end, a test apparatus was built to represent a two-degree-of-freedom structure model coupled with a TVA. The semi-active TVA considered in this study employed a magneto-rheological (MR) damper as its damping element to enhance overall performance. Using this test apparatus, a series of tests were conducted to identify the optimal tuning parameters of the TVAs. After obtaining each TVA’s optimal tuning parameters based on equal peak transmissibility criteria, the mass off-tuning tests were then performed on the optimally tuned TVAs. In order to off-tune the system, the mass of the primary structure varied from 19% to +19% of its nominal mass using a set of steel plates. Overall, the experimental results show that the semi-active MR TVA outperforms the passive TVA in reducing maximum vibrations. Moreover, the results show that the semi- active TVA is more robust to changes in the primary mass (mass off-tuning) The results further show that the semi-active MR TVA offers larger performance gains as the structure mass increases.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Lumped-parameter models of semi-active TVAs

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Figure 2

Experimental setup and its primary components

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Figure 3

The magneto-rheological damper and its damping force envelope

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Figure 4

Schematic of data acquisition

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Figure 5

Removing mass from the Structure: (a) Passive TVA and (b) semi-active TVA

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Figure 6

Adding mass to the structure: (a) Passive TVA and (b) Semi-active TVA

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Figure 7

Peak transmissibility reduction over the passive TVA




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