Automatic Sensor less Rotational Velocity Estimation on Asynchronous Machines for Vibration Analysis
Keywords:
Automated Analysis, Condition Based Maintenance, Condition Monitoring, Rotational Speed Estimation, Vibration AnalysisAbstract
Detection of incipient faults in rotating machinery is essential to optimize their availability. Online vibration monitoring is a widely recognized approach to gauge the health of machines such as induction motor driven centrifugal pumps. Common faults in such a set-up can be detected by analysing specific fault-related frequency components in the vibration signal, which are almost exclusively (harmonic) multiples of the rotational speed. However, the exact rotational speed is often unknown, which severely complicates the vibration analysis. Online vibration measurements can yield large amounts of data, which necessitates the automation of data processing. This paper presents a novel method that automatically determines the rotational speed from an individual vibration measurement using minimal prior knowledge of the measured system. The proposed method determines the rotational speed with a specified maximum error of 0.0165 Hz for 90.1 percent of cases in the recent dataset containing over 2300 measurements. This paper demonstrates that the proposed method significantly improves upon a comparable method from the literature, as shown through a benchmark comparison.
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