A Method for Designing and Fabricating Broadband Vibration Absorbers for Structural Noise Control

[+] Author and Article Information
Eiichi Nishida

Department of Mechanical System Engineering,  Shonan Institute of Technology, 1-1-25 Tsujido-Nishikaigan, Fujisawa, Kanagawa, 251-8511, Japannishida@mech.shonan-it.ac.jp

G. H. Koopmann

Center for Acoustics and Vibration, Department of Mechanical Engineering, Pennsylvania State University

J. Vib. Acoust 129(4), 397-405 (Nov 01, 2006) (9 pages) doi:10.1115/1.2424968 History: Received May 21, 2004; Revised November 01, 2006

In this paper, a method for designing and fabricating broadband vibration absorbers (BBVAs) for structural noise control is described. The BBVA’s consist of a series of cantilevered masses, closely spaced in frequency and sharing a common hub that attaches to the host structure. To accommodate applications involving shell structures, both translational and rotational degrees of freedom are considered in the analysis. The BBVA is modeled with a simple, three-by-three impedance matrix to facilitate its subsequent incorporation into a larger structural optimization study. In order to validate this modeling method, an experimental impedance identification method was developed. This method was applied to a physical BBVA consisting of 12, cantilevered masses emanating from a common hub and attached to a solid base plate that simulates the degrees of freedom of a shell structure. Analytical and experimental results are in excellent agreement, demonstrating the efficacy of the approach. The proposed modeling and fabrication method provides a simple and straightforward way to incorporate BBVAs in optimization studies applied to the design of quiet structures.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 2

Design parameters and coordinate systems for BBVA on shell

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Figure 3

Logic flow of BBVA impedance formula derivation

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Figure 4

Structure of element

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Figure 5

Coordinate system of element

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Figure 6

Experimental setup for identification of BBVA impedance

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Figure 7

Modal damping ratio identified by impact tests

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Figure 8

Identification of local stiffness

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Figure 9

Frequency response spectra of BBVA prototype impact tests

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Figure 10

BBVA impedance-comparison of experimental identification (—) and analytical model (– – –)

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Figure 11

Frequency distribution of elements for broadband characteristics

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Figure 12

Numerical simulation of BBVA impedance—setting for broadband characteristics




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