| 摘要 |
PURPOSE:To decide which sensor is abnormal through only arithmetic processing by providing plural sensors and discriminating the maximal value of a mutual correlation function found from output signals of the respective sensor and the maximal value of an autocorrelation function. CONSTITUTION:Two sensors 1 and 2 as shaft vibration meters for one shaft are installed in a high-speed rotary machine such as a compressor and a turbine at a circumferential interval of 90 deg. to detect shaft vibrations. The mutual correlation function and autocorrelation function between the output signals of those two sensors 1 and 2 are found. The maximal value of the mutual correlation function is much less than '1' if a sensor is abnormal. The maximal value of the autocorrelation function is also much less than '1' if a sensor is abnormal, so it is discriminated which sensor is abnormal from the maximal values of both functions.
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