Vibration Analysis of Refrigerant Compressor Shaft

An analysis of transverse vibrations of a compressor, using the modified Mykle stad-Prohl method which is one of the transfer matrix methods, is explained. A 10 hp four-cylinder refrigerant compressor was used as an object. The shaft and the frame are modeled as beams which are coupled with the sets of a spring and a damper that are the models of bearing oil film, bearing pedestals or the magnetic pull force of the motor (the frame is supported with suspensions) • The forces considered include unbalance forces and pressure forces. The experimental apparatus used to measure the vibrations of the shaft and the frame is described, and computed and measured traces illustrating the vibration amplitudes are presented. INTRODUCTION One of the most important problems in refrigerant compressor making is response problem of transverse shaft vibrations. Because, air conditioners with less vibrations and less noises are welcomed these days. Besides there are so many variable speed compressors driven by inverters. This paper presents an analysis of compressor shaft vibrations, taking an example of a 10 hp reciprocal refrigerant type, using multi level rotor dynamic calculation program, shown in Fig. l.