Bolt tightening force detection using outlier analysis of structural natural frequencies

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (23) : 77-82.

GOU Bai-yong1,2, LU Qiu-hai1, WANG Bo1 WANG Shi-ying1

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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.

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GOU Bai-yong1,2, LU Qiu-hai1, WANG Bo1 WANG Shi-ying1. Bolt tightening force detection using outlier analysis of structural natural frequencies[J]. Journal of Vibration and Shock, 2015, 34(23): 77-82

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