利用固有频率异常值分析法检测螺栓拧紧力

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Abstract In order to evaluate the severity of bolt looseness quantitatively, a study was made about detecting bolt tightening force using structural first 5 natural frequencies and the Squared Mahalanobis Distance (MD) outlier analysis. First, test the structural natural frequencies under different tightening force condition, and then, compute the Standard Euclidean Distance (SED) between fully-tightening condition and several not-fully-tightening conditions. The fitting curve between SEDs and tightening forces was made using Matlab, and a method was proposed about detecting tightening force. Experimental verification and application example were given at last. Study shows that there is an exponential relationship between SEDs and tightening forces, the relationship can be use to evaluate the severity of bolt looseness reliably.

Key words： bolt looseness damage detection SHM natural frequency Standard Euclidean Distance.

Received: 22 September 2014 Published: 15 December 2015

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2015/V34/I23/77

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