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Advanced analysis of MEMS accelerometers for monitoring reciprocating refrigerant compressors.

Number: 1211

Author(s) : PAL F. J., LANGEBACH R., ANDJELKOVIC M., PFLIEHINGER T., AHREND U., HESSE U.

Summary

Monitoring machine vibrations of rotating equipment such as pumps, fans or turbines has been established as a main part of condition monitoring in recent years. With this type of vibration monitoring, it is possible to detect mechanical failures like bearing problems, motor unbalance, as well as shaft or angular misalignment. In addition to selecting appropriate measurement points and necessary accelerometers, specific knowledge and experience are required to analyze machine vibrations correctly. For refrigerant compressors, several manufactures offer monitoring solutions for ‘easy to measure’ standard parameters such as temperature, pressure or electrical signals. Those signals are collected electronically and processed into a representative output signal in order to set machine failures. Additional sensor signals from refrigerant plant monitoring are also available for correlation. However, the predictive power of all these measured parameters in relation to specific components, in particular the compressor, is limited. Extending available information by vibration signals of the compressor can significantly increase the informative value. So far, however, this has only been commercially attractive in special cases due to comparatively high costs for sensors and measurement technology. This paper discusses an alternative approach by applying low-cost MEMS accelerometers. A well-chosen set of sensors have been evaluated experimentally with respect to worked-out requirements. Experimental results are analyzed within the time and frequency domain and compared to industrial accelerometers. Additionally, initial measurements on the compressor shell and an expansion valve were carried out for prove of concept. It can be shown that MEMS accelerometers can be used to monitor basic mechanical vibrations such as the compressor or evaporator fan speed and furthermore flow-induced noise generated by refrigerant flowing through an expansions valve.

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Pages: 12 p.

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  • Original title: Advanced analysis of MEMS accelerometers for monitoring reciprocating refrigerant compressors.
  • Record ID : 30030287
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15

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