Experimental and Numerical Study on the Squeal of a Rotary Compressor

Abstract

This study predicts the squeal instability of a rotary compressor using a full-size finite element model. A complex eigenvalue extraction method was used to study the tendency toward squeal of the rotary compressor during working. The numerical results showed that the unstable vibration frequency of the rotary compressor was 6,908 Hz, which corresponded to the frequency of the rotary compressor squeal. The squealing vibration of the rotary compressor was also measured, with results showing that the measured squeal frequency was in good agreement with that predicted by the finite element model. Transient dynamic analysis results showed that when squeal occurred, the main frequency of the normal acceleration of the upper flange was the same as that of the tangential acceleration. This phenomenon showed that the coupling of the normal vibration and tangential vibration of the upper flange was a main reason for the compressor squeal. Also, the greater the friction coefficient, the higher the likelihood of a squeal occurrence.