ウェーブレット変換を用いた機械・構造物のヘルスモニタリングシステム : 正規直交ウェーブレットの生成と断続的異常信号の検出

概要

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It is very important to estimate the damage rate of machines and structures caused by low cycle fatigue under dynamic loading, from the point of view of guaranteeing their safety and developing the scheme of their maintenance. Therefore, the in-service health monitoring system to monitor the damage rate of machines and structures by low cycle fatigue is proposed to assure the safety of the structures. In this paper, the use of wavelet transform is proposed to extract the fatigue signals from the noisy detected signals. The model of fatigue is considered to be that of reducing stiffness of members of machines and structures having impulse forces occurring at random intervals. The response of machines and structures excited by these impulse forces is analyzed under noisy conditions. The wavelet transform is applied to the analyzed responses, and extraction of the assumed signals of fatigue from these responses is proven.
1995-06-25