2004 表面音響インテンシティ法による GHP 低騒音化

概要

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Sound power is a useful quantity for rank ordering noise radiated from different machines or machine components. For a complicated vibrating structure. it is difficult to isolate the sound power of specific area from the total sound power with a two-microphone intensity probe or in a reverberant chamber. To facilitate this type of measurement. a new type of intensity probe that measures sound intensity directly on a vibrating surface has been developed. In this paper, the surface intensity probe and the two-microphone intensity probe are used to measure the intensity field of a Gas Heat Pump air-conditioner in order to quantify the sound power radiated from each of its walls and components. It is observed that most of sound power from GHP is radiated from a base plate, an exhaust noise and an intake noise in the 160Hz and 630Hz, 1/3 octave band, which is the most significant frequency bands in the sound pressure spectrum at evaluation point.
社団法人日本機械学会の論文
2002-09-20