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《Journal of Vibration and Shock》 2015-23
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Bolt tightening force detection using outlier analysis of structural natural frequencies

GOU Bai-yong;LU Qiu-hai;WANG Bo;WANG Shi-ying;School of Aerospace,Tsinghua University;Aeronautic and Astronautic Engineering College,Air Force Engineering University;  
In order to evaluate the severity of bolt looseness quantitatively,a study was made to detect bolt tightening force using structural first 5 natural frequencies and the squared mahalanobis distance( MD) outlier analysis.Firstly,the structural natural frequencies under different tightening force condition were measured,and then,the standard euclidean distances( SEDs) between the natural frequency vector under fully-tightening condition and those under several not-fully-tightening conditions were calculated. The fitting curve for SEDs and tightening forces was made using Matlab,and a method was proposed to detect tightening force. Test verification and application examples were given at last. The results showed that there is an exponential relationship between SEDs and tightening forces,this relationship can be used to evaluate the severity of bolt looseness reliably.
【Fund】: 国家自然科学基金资助项目(11090334 11372154)
【CateGory Index】: TH131.3
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