Dynamic Analysis of a Compressor Mounting System

Compressors are a primary cause for numerous HV AC noise and vibration problems. Typically, vibration energy is transmitted from the compressor to the chassis through piping and isolation mounts. The design of these attachments is thus of paramount importance in determining the dynamic performance of a HV AC unit. Below certain frequencies, compressor vibration can be well described as a rigid-body having six degrees of freedom. In this paper. a procedure for complete determination of the compressor vibration is described based on the rigid-body model. It can be used to reduce the number of measuring points in a vibration monitoring test. Further, a dynamic compressor system model is presented that allows to predict force transmissibilities and the responses of the compressor to the applied forces. This model has been applied to determine the dynamic characteristics of a compressor system.