Near field Acoustical Holography Research Application on Compressor Refrigerator

摘要

Noise is one important factor for product performance of compressor & refrigerator. Products must satisfy with notrnonly meeting the national standards but also the consumers’ gradually increasing requirements for sound qualityrnbecause of market competition. Near field acoustical holography is a high-resolution imaging technique forrnreconstructing the vibro-acoustical field that will guide to locate noise source and understand the relationshiprnbetween structure vibration and sound radiation. Near field acoustical holography method based on the EquivalentrnSource Method is applied to analyze the vibro-acoustical characteristics of both compressor and refrigerator.rnEquivalent Source Method is applicable for arbitrary shaped vibrating surface, presenting calculation faster than thernBoundary Element Method, and better than the Helmholtz Equation Least Square Method, especially for elongatedrnand planar sources. In virtue of this approach, velocity & sound pressure distribution over the sample geometry ofrncompressor & refrigerator were gotten at critical frequencies, so main noise sources were located.