Noise Source Identification in Highly Reverberant Enclosures by the IFRF Method

摘要

Noise source identification in highly reverberant enclosures is a difficult and time consuming task. One useful technique is the Inverse Frequency Response Function (IFRF) method, constructing FRFs experimentally using an array of microphones surrounding an absorptive center body. The use of an absorptive insertion reduces the strength of the resonant acoustic modes and thereby improves the quality of the FRFs. To efficiently design this physical test, the feasibility of using Boundary Element and Finite Element Methods to analytically determine the frequency response functions between selected panel points and microphones in the array is investigated. The information from the BEM/FEM analyses may be very useful for selecting physical parameters for the experimental measurement of the FRFs. The design and material selection of the absorptive center body, as well as the strategy of microphone deployment, can be made through use of these numerical analyses without the additional physical setup requirements.