Research Papers

Vibration Reduction Index of a T-Junction With a Flexible Interlayer

[+] Author and Article Information
J. Alba, E. Escuder, R. Del Rey

IGIC, Department of Applied Physics, Higher Polytechnic School of Gandía,  Polytechnic University of Valencia, c/ Paraninfo n° 1, 46730 Gandia, Spain

J. Ramis

Department of Physics, Engineering of Systems and Signal Theory,  University of Alicante, Alicante 99, 03080, Spain

E.G. Segovia

Department of Civil Engineering,  University of Alicante, Alicante 99, 03080, Spain

J. Vib. Acoust 134(2), 021009 (Jan 18, 2012) (10 pages) doi:10.1115/1.4004675 History: Received August 18, 2010; Revised May 03, 2011; Published January 18, 2012; Online January 18, 2012

This paper describes the procedure followed to evaluate the vibration reduction index for T-junctions with inserted flexible elements and proposes new equations to complement the standard EN 12354-1:2000. The experiment described in this work is based on a 1:3 scale model of a T-junction with a flexible interlayer. It was used to obtain a significant reduction in the cost of the configurations under study. We chose to carry out vibration measurements by near-field acoustic holography (NAH) in order to avoid the risk of accelerometer interference. Flanking transmission was determined for different elastic layers with the objective of quantifying the effect of the flexible interlayer and to compare the results obtained with predictive formulas. The results enabled us to propose new equations to complement EN 12354-1:2000 for the reliable prediction of the apparent sound reduction index. The uncertainty associated with the different average velocity levels is determined according to the Guide for the Expression of Uncertainty of Measurement (GUM).

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 3

Junctions with elastic interlayer

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Figure 4

T-junction, measurement plane on zh , and vibrating plane in the junction on zs

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Figure 5

Flexible interlayers

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Figure 6

Scale model. Left: dimensions. Right: photography.

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Figure 7

Experimental, theoretical, and linear fit for direct-flank (df) vibration reduction index in the range 200–1250 Hz

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Figure 8

Experimental, theoretical, and linear fit for flank-direct (fd) vibration reduction index in the range 200–1250 Hz

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Figure 1

Rigid cross-junction

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Figure 2

Rigid T-junction



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