Verification of the reciprocating compressors monitoring using vibration models

Abstract

Since the 1950s, techniques for reciprocating compressor monitoring have been developed. However, they cannot locate damage points in advance and have difficulty in assessing the degree of damage. The purpose of this study is to establish a new monitoring technique to detect the state of sliding portion and connecting portion, where it is known that some failure often occurs. In this paper, we examined the feasibility of estimation for the state in which the support rigidity of the sliding portion using the vibration characteristics in the experiment for a small experimental equipment. To estimate the state of sliding portion, we employ two kinds of material, carbon and molybdenum steel as the ring bush of the ground support. We determine the model parameters using both the natural frequencies obtained from the experimental and the eigenvalue analysis based on the inverse problem. Namely, we were assessed difference of the natural vibration characteristics comparison of the mathematical model with six and eleven degrees of freedom. As a result, it is found that we can estimate the characteristics of the sliding portion by focusing on the natural vibration characteristics. In particular, it showed the possibility of estimating the condition of sliding portion using mathematical model with eleven degrees of freedom.