The sound quality and noise level of the compressor are obviously affected by balance of the crank-shaft system. An intermittent abnormal noise problem on a customer air-conditioner was detected through the crank-shaft displacement test, it is caused by the radial and longitudinal imbalance of the crank-shaft system of the rotary compressor. The test shows that the abnormal noise develops with the radial and longitudinal run-out of the crank-shaft of the compressor, the forces of the crank-shaft system are studied with the mechanical model and the optimization design schemes are obtained to solve the noise problem.
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