Multi-stage diagnostic system for reciprocating compressor using DTW technique

The reciprocating compressor has widely been used in the industry because of low cost to mass production and high efficiency of performance. If an abnormal compressor is produced, high service cost occurs due to the increased service claim rate (SCR). A great deal of research has been conducted for real-time diagnosis of the compressor while it is being made in the manufacturing line. However, since the compressor structure is quite complicated, it is still difficult to find the cause of the compressor fault. Even with outstanding diagnostic tools, it is hard to screen an abnormal compressor at one time. We have developed a multi-stage diagnosis scheme to monitor the abnormal compressor. In this diagnosis scheme, the dynamic time warping (DTW) technique is employed to diagnose the fault compressor. The LAN based network is applied for connecting from first diagnosis PC to second diagnosis PC. The multi-stage diagnosis manufacturing line is established and the DTW technique has been successfully implemented in the diagnostic system. The multi-stage DTW system screens most of the abnormal compressor. The gage R&R is conducted to secure the reliability of the system.