Computer simulation of gas pulsation generated sound in compressors
Abstract
A computer simulation model of compressors was developed to predict gas pulsations, compressor shell vibrations, and sound radiation. The cylinder pressure, the valve motion, the flow through the valve and the pulsating pressure of a hermetic, reciprocating compressor have been developed by solving the mathematical model of each process. The results of internal measurements supported the theoretical simulation results. The muffler system of a compressor was investigated by formulating a total four-pole matrix for the acoustic elements. The characteristics of the muffler were combined with the valve flow and the gas pulsation in the interior volume of the compressor shell. The interior volume was modeled as an annular cylindrical cavity. Four-pole parameters of the annular cavity were formulated by using modal expansions in a three-dimensional way. The vibration of the compressor shell excited by the gas pulsation was studied by solving the inhomogeneous equation of motion of an equivalent cylinder. The sound radiation was calculated from the velocity field of the compressor shell excited by the gas pulsation. The sound and vibration levels were measured to partially verify the simulation results and to identify the noise and vibration sources.
Degree
Ph.D.
Advisors
Soedel, Purdue University.
Subject Area
Mechanical engineering
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