646 ボルト緩みの一検出法 : 保守検査の観点から

概要

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On the aim of applying structural health monitoring concept to maintenance inspection, a few trials are done on the detection of bolt loosening without human-involvement. PZT was a first candidate as a shaker and a sensor of this purpose, and it was applied to a beam with bolt connection joint at first, then as a self-sensing actuator it was on the beam. In both case, cxperimental results taught that the bending shaking was not good to obtain enough magnitude of output from sensor PZT. So their consideration turned to apply axial dynamic loading, but PZT plate on the beam did not suit for this purpose. Then actual, dynamic load on the test structures/machines become imaginary shaking source, and then electric resistance strain gauge and histogram recorder were taken as a scnsing system of detecting bolt loosening in their thinking. Possibility of this imaginary system for detection of bolt loosening was discussed. As second trial, a washer type PZT was applied to shake fastened bolts in standard fastening torque. As experimental result, a good correlation between the change of output voltage of PZT and the decrement of bolt fastening torque was obtained.
一般社団法人日本機械学会の論文
2002-09-20