回転機械の軸受監視における警報の信頼性の評価 : 誤報等により生じる損失に関する考察

概要

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In this paper, the performance of alarm systems which are based on vibration monitoring is considered. Evaluation and comparison of alarm systems based on loss, e.g. missed prohibit due to false alarm and cost of repair due to missing alarm, are reported. As the high sensitivity and low false alarm rate contradict each other, loss is one of the important indices for alarm system evaluation. Two methods are compared: one is the threshold method (level-checking method) and the other is the Kalman-filter-based method combined with Bayes' theorem. Bench-size machinery is constructed, then its vibration is measured by an acceleration sensor attached on a bearing housing. In each method, parameters are adjusted to minimize the expected total loss. In this situation, the ranges in which the threshold method is applicable and the Kalman-filter-based method is applicable are shown on an ROC (receiver operating characteristic) chart. A generalized procedure for selecting an alarm system using ROC is also discussed.
一般社団法人日本機械学会の論文
1997-02-25