Tan, Wei Hong
(2013)
Analysis Of Vibro-Acoustic Effect Of
Micro-Perforated Panel Sound
Absorber.
PhD thesis, Universiti Sains Malaysia.
Abstract
The application of micro-perforated panel (MPP) in the silencers and optimization
of dual layer MPP sound absorber are evaluated in this study. MPP is a good
candidate to be used in the silencer for achieving high transmission loss as it delivers
high sound absorption performance. Boundary element method (BEM) in acoustical
simulation has been used to assess the transmission loss performance of silencer attached
with MPP, and when compared with the measurement using two-load method
shows good agreement with the strong correlation coefficient, which is between 0.77
to 0.89. This verifies the BEM model of the silencer transmission loss analysis. For
simple expansion chamber silencer, the application of MPP in the BEM model shows
improvement in the transmission loss results with broader frequency bandwidth compared
to the simple expansion chamber silencer without the MPP. The simulation work
and analysis continues with the reflective system silencer and perforated tube silencer
with MPP. The second part of this study is the optimization of the dual layer MPP
sound absorber with consideration of the vibro-acoustic effect in which the classical
plate equation is coupled to the acoustic wave equation. This is enhancing the sound
absorption performance of an MPP sound absorber by taking the advantage of MPP
plate vibration effect. The results of the vibro-acoustic model when applied to the single
layer MPP, were found to be in good agreement with other published results.
Actions (login required)
 |
View Item |
