Ben S. Cazzolato, Carl Q. Howard and Colin H. Hansen
Classical
analytical models used for prediction of the performance of reactive silencers
are limited to conditions where the dimensions of the duct and resonators
are small compared to the wavelength of the sound. Finite Element Analysis
does not suffer from such limitations and has therefore been used to analyse
the design of a reactive silencer for the exhaust stack of a 980MW power station.
To assist in the design process, resonators of various dimensions were analysed
using FEA which has led to the derivation of expressions for the resonance
frequencies of slot-type rhomboid shaped resonators as a function of the geometry.
An important design issue is the influence that adjacent resonators have on
the overall performance of the system. It was found that when resonators of
similar resonance frequency are in close proximity, they can interact and
lead to a decrease in the overall performance compared to that of a single
resonator.
The Fifth International
Congress of Sound and Vibration,
December 15-18, 1997, University of Adelaide, Adelaide, Australia, Vol. 3,
pp. 1659-1667