機械構造物の実時間状態監視法の開発に関する研究 : 第1報, 定常稼動状態での周波数応答関数計測法

概要

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Various methods for detecting damages in structures are already proposed. Some of them use dynamical response of structure, FRFs, mode shapes, natural frequencies and so on. In almost of these techniques dynamical response is obtained from vibration testing of structures out of operation or the existence of measured dynamical response is assumed. However, in operation real-time methods for detecting damages are desired. In this paper, we propose a method for measuring FRFs under steady operational condition and perform two fundamental experiments as the first report of our researches on the development of real-time structural health monitoring. The fundamental concept of the method is measuring noise caused by steady operation at first, and then subtracting the noise from response to testing forces, Note here that the phase of measured noise and that of included in response are different. Simply subtraction is inexact. In the proposed method, we mesure two time series data of noise and obtain the relation between time difference and phase difference. Then we predict noise included in response by using this relation and subtract predicted noise from response.
一般社団法人日本機械学会の論文
2001-08-25