Improvement of Transmission Loss Using Active Control with Virtual Modal Mass | Zendy

Adeline Bourdon | Zendy; Luc Gaudiller | Zendy; Charles Pézerat | Zendy; Simon Chesné | Zendy

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Improvement of Transmission Loss Using Active Control with Virtual Modal Mass

Author(s) -

Adeline Bourdon,

Luc Gaudiller,

Charles Pézerat,

Simon Chesné

Publication year - 2008

Publication title -

advances in acoustics and vibration

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.237

H-Index - 14

eISSN - 1687-627X

pISSN - 1687-6261

DOI - 10.1155/2008/603084

Subject(s) - modal , acoustics , modal testing , modal analysis , vibration , engineering , active vibration control , bandwidth (computing) , modal analysis using fem , sound transmission class , vibration control , computer science , physics , materials science , telecommunications , polymer chemistry

This paper deals with an alternative modal active control approach to reduce sound transmission through a structure excited by an acoustic wave. Active control makes it possible to conserve lightnesswhile improving acoustic performances. “Modal mass damping control” is proposed for light and smallstructures having slight modal overlap. The aim of this control is to modify the modal distribution of highradiation efficiency modes with active modal virtual mass and active modal damping. The active virtualmass effects lower eigen frequencies to less audible frequency range while reducing vibration amplitudesin a broad frequency range. An application of this concept is presented in a simple smart structure. Itis harmonically excited on large bandwidth by a normal acoustic plane wave. Results obtained by activemodal virtual mass and damping control are compared to other modal control approaches

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