DETERIORATION MONITORING METHOD AND DETERIORATION MONITORING DEVICE USING AE METHOD

PROBLEM TO BE SOLVED: To provide a deterioration monitoring method by an AE method in which an influence of noise is further reduced.SOLUTION: A deterioration monitoring method includes: a reference value acquisition step for acquiring the number of signals obtained by AE measurement for the same material as an inspection object over an entire observation period; an evaluation curve generation step for calculating the number of reference AE obtained by subtracting the number of reference noise signals set on the basis of the number of reference signals in the early stages of the entire observation period from each of the number of reference signals for each first unit period and indicating a transition over the entire observation period; an object value acquisition step for acquiring the number of object signals obtained by the AE measurement of the inspection object; an object AE number calculation step for calculating the number of object AE obtained by subtracting the number of object noise signals set on the basis of the number of object signals acquired in an early stages in time series from the number of object signals; and a deterioration evaluation step for evaluating the deterioration degree of the inspection object on the basis of the evaluation curve and the number of object AE.SELECTED DRAWING: Figure 3 【課題】ノイズの影響がより低減されたＡＥ法による劣化モニタリング方法を提供する。【解決手段】劣化モニタリング方法は、検査対象物と同質材料に対するＡＥ計測により得られる信号数を全観測期間にわたって取得する参照値取得ステップと、前記全観測期間の初期における前記参照信号数に基づいて設定される参照ノイズ信号数を、前記第１単位期間毎の前記参照信号数のそれぞれから減算した参照ＡＥ数を求め、前記全観測期間わたる推移を示す評価曲線生成ステップと、前記検査対象物に対するＡＥ計測により得られる対象値取得ステップと、時系列で初期に取得される前記対象信号数に基づいて設定される対象ノイズ信号数を、前記対象信号数から減算した対象ＡＥ数を求める対象ＡＥ数算出ステップと、前記評価曲線と前記対象ＡＥ数とに基づいて、前記検査対象物の劣化度合いを評価する劣化評価ステップと、を備える。【選択図】図３