Sources of noise at discrete frequencies 1n compressors may be generated by acoustic energy in the discharge pulse exciting mechanical or acoustic resonances within the compressor assembly. In this ease history, a known noise source was used 1n the vicinity of the discharge port to excite those resonances 1n a bench-type test where they could be easily identified. This test could be run 1n air at a room ambient rather than at the temperature and refrigerant environment of a full prototype. Modelling clay was used to experimentally modify acoustic cavities since actual compressor operation was not required. This allowed rapid evaluation of several different design proposals. A final recommendation was made and verified through testing of a sample of full prototypes.
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