Abstract
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. We have proposed a monitoring method using mathematical model and actual measurement data for the reciprocating compressor moving parts in order to construct a system for monitoring the state during operation of the reciprocating compressor and predicting and diagnosing signs of damage. In this paper, a case study is carried out using the experimental data, where the data were acquired before and after the failures occurred in the connecting parts of connecting rod, to prospect the difference between each parameter value for two operating states. To equate the calculated each natural frequency from eigen value analysis based on the proposed model with each resonant frequency, we define the error function for identified problem. In this example, it is assumed that the crosshead pin connecting the connecting rod and the crosshead wears out, and the dimensions of the crosshead pin are processed. The identified results showed that there was a change in the connecting part between the connecting rod and the crosshead, and it was confirmed that the same parts as in this example were changed.
