Shaft Vibration Monitoring System for Recirculation Pump Built in Reactor

摘要

PURPOSE:To separate proper shaft vibration waveform signals from shaft vibration waveform signals containing rotational pulse signals by providing, principally, a each column storing section, analyzing section, displaying sections, etc., in addition to a separating and processing section incorporating a threshold calculating means, calculating means. CONSTITUTION:A threshold calculating means 12a calculates a threshold and discriminates raw waveform data by comparing the data with the threshold. When the raw waveform data are larger than the threshold, the means 12a discriminates that the data contains a rotational pulse signal. When the data is smaller than the threshold, the means 12a discriminates that the data do not contain any rotational pulse signal. Successively, a second calculating means 12C generates a rotational pulse signal based on the raw waveform data for the raw waveform data containing the rotational pulse signal and outputs the generated pulse signal. Then a shaft vibration waveform signal is generated from the rotational pulse signal and raw waveform data and a proper shaft vibration waveform signal is generated by synthesizing the shaft vibration waveform signal with the part of the first generated shaft vibration waveform signal containing no rotational pulse signal. Therefore, the shaft vibration can be exactly monitored, because the shaft vibration waveform signal containing no rotational pulse signal can be accurately separated.