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Research Papers

Multiphysics Modeling and Experimental Validation of the Active Reduction of Structure-Borne Noise

[+] Author and Article Information
Tomasz G. Zielinski

Department of Intelligent Technologies, Institute of Fundamental Technological Research, ul. Pawinskiego 5B, 02-106 Warszawa, Polandtzielins@ippt.gov.pl

J. Vib. Acoust 132(6), 061008 (Oct 08, 2010) (14 pages) doi:10.1115/1.4001844 History: Received September 17, 2009; Revised April 27, 2010; Published October 08, 2010; Online October 08, 2010

This paper presents a fully coupled multiphysics modeling and experimental validation of the problem of active reduction of noise generated by a thin plate under forced vibration. The plate is excited in order to generate a significant low-frequency noise, which is then reduced by actuators in the form of piezoelectric patches glued to the plate with epoxy resin in locations singled out earlier during finite element (FE) analyses. To this end, a fully coupled FE system relevant for the problem is derived. The modeling is very accurate: The piezoelectric patches are modeled according to the electromechanical theory of piezoelectricity, the layers of epoxy resin are thoroughly considered, and the acoustic-structure interaction involves modeling of a surrounding sphere of air with the nonreflective boundary conditions applied in order to simulate the conditions found in anechoic chamber. The FE simulation is compared with many experimental results. The sound pressure levels computed in points at different distances from the plate agree excellently with the noise measured in these points. Similarly, the computed voltage amplitudes of controlling signal turn out to be very good estimations.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Multiphysics system

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Figure 2

Problem geometries and FE meshes

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Figure 3

Eigenmodes and eigenfrequencies

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Figure 4

Experimental stand for the experiment in anechoic chamber

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Figure 6

Noisy low-frequency vibrations

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Figure 8

Piezopatch actuator

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Figure 9

Diagram of the phase 1 of experiment (passive behavior)

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Figure 10

Amplitude of normal velocities and deflections (along the line y=0 mm) of the plate with 6 passive piezopatch actuators (for harmonic excitation with frequency 115 Hz)

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Figure 11

A microphone behind the plate

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Figure 12

Amplitude of acoustic pressure variation at plane y=0 cm obtained for time-harmonic excitation with frequency 115 Hz

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Figure 13

Amplitude of acoustic pressure at line x=15 cm, y=0 cm (for harmonic excitation with frequency 115 Hz)

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Figure 14

Sound pressure levels (SPL) for time-harmonic excitation with frequency 115 Hz

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Figure 15

SPL at the plane x=15 cm (the excitation frequency is 115 Hz)

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Figure 16

Diagram of the phase 2 of experiment (active behavior)

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Figure 17

Fixed-frequency signal changer

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Figure 18

Passive and active behavior of plate

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Figure 19

The “noisy behavior” of plate with passive piezopatch actuators

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Figure 20

Active reduction of structure-borne noise

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Figure 21

Generation of noise by overloaded piezopatch actuators

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Figure 22

Quantitative results of experimental tests

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