Condition monitoring system and wind turbine
AssigneeNtn Corporation
InventorTakashi HASEBA
Life of this patent
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Abstract
A vibration sensor measures a vibration waveform of a mechanical component. A processor detects a change in the vibration waveform. The processor includes an evaluation value computing unit and a detector. The evaluation value computing unit time-sequentially computes an evaluation value that characterizes a root-mean-square value of vibration waveform data output from the vibration sensor within a prescribed time period. The detector detects a change in the vibration waveform based on the evaluation value. The evaluation value computing unit computes, as the evaluation value, a value based on kurtosis and skewness of a distribution of the root-mean-square value within the prescribed time period.
Claims5
A condition monitoring system configured to monitor a condition of a mechanical component in an apparatus, the condition monitoring system comprising:
- a vibration sensor configured to measure a vibration waveform of the mechanical component;
- and
- a processor configured to detect a change in the vibration waveform,
- the processor including
- an evaluation value computing unit configured to time-sequentially compute an evaluation value that characterizes a root-mean-square value of vibration waveform data output from the vibration sensor within a prescribed time period, and
- a detector configured to detect a change in the vibration waveform based on transition of the evaluation value,
- the evaluation value computing unit being configured to compute, as the evaluation value, a value based on kurtosis and skewness of a distribution of the root-mean-square value within the prescribed time period.
Dependencies are inferred from the claim text.