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Bending nearfield compensation in the context of vibroacousticactive control

Published online by Cambridge University Press:  14 November 2014

M. Michau ,
A. Berry ,
P. Herzog  and
P. Micheau
M. Michau*
Affiliation:
École Centrale de Marseille, 13013 Marseille, France
A. Berry
Affiliation:
Faculté de Génie Mécanique, GAUS, Université de Sherbrooke, Canada
P. Herzog
Affiliation:
Laboratoire de Mécanique et d’Acoustique, Marseille, France
P. Micheau
Affiliation:
Faculté de Génie Mécanique, GAUS, Université de Sherbrooke, Canada
*
a Corresponding author:[email protected]
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Abstract

The efficiency of passive methods for noise reduction decreases at low frequency. In thisfrequency range active structural acoustic control (ASAC) can reduce sound radiation ofstructures by controlling their vibration usually using piezoelectric or electrodynamictransducers. Besides its global effect on the structure, a bending nearfield is observed,depending on the actuator type. In some ASAC strategies as in the virtual impedanceapproach, actuators and sensors are collocated. Although it does not affect the radiationof the structure, the local bending strongly modifies the transfer function betweentransducers. A method is proposed in order to identify and compensate it. The global partof the vibratory field is extracted by cancelling the contribution of higher order modesapproximated as a stiffness. After compensation, the signal from the sensor is much morerepresentative of the radiation and nearly independent of the nature and the size of theactuator.

Keywords

Nearfield compensationvibroacoustic active control
Type
Research Article
Information
Mechanics & Industry , Volume 15 , Issue 6 , 2014 , pp. 551 - 555
Copyright
© AFM, EDP Sciences 2014

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