ABNORMALITY SIGN DIAGNOSTIC DEVICE AND DIAGNOSIS METHOD THEREOF

To diagnose a deterioration sign of a dynamic function of a valve and a function of closing fluid with high accuracy, without decomposing the valve.SOLUTION: An abnormality sign diagnostic device 20 comprises: a signal processing unit 9 that processes a signal of at least one acoustic sensor 2 that detects the sliding sound of a valve; an analysis unit 11 that obtains the state of the leakage, surface roughness or friction coefficient of a sliding part that emits the sliding sound based on the spectral intensity of the sliding sound that is processed by the signal processing unit and detected by the acoustic sensor; and a determination unit 16 that determines the sign of deterioration including normality or not regarding a function of closing the fluid and a dynamic function of the valve, based on the leakage, surface roughness or friction coefficient of the sliding part obtained by the analysis unit, and predicts a maintenance timing including the decomposition of the valve.SELECTED DRAWING: Figure 2 【課題】弁を分解することなく、高い精度で弁の動的機能および流体を閉止する機能の劣化予兆診断を行えるようにする。【解決手段】本発明の異常予兆診断装置２０は、弁の摺動音を検出する少なくともひとつの音響センサ２の信号を処理する信号処理部９と、信号処理部で処理され、音響センサにより検出した摺動音のスペクトル強度から摺動音を発する摺動部の漏洩量、面粗さ、または摩擦係数の状態を求める分析部１１と、分析部で求めた摺動部の漏洩量、面粗さ、または摩擦係数から弁の流体を閉止する機能および動的機能に関する正常か否かを含む劣化の予兆を判定して弁の分解を含むメンテナンス時期を予測する判定部１６と、を備えるようにした。【選択図】 図２