Bolt looseness nonlinearity detection and location based on 3/2-D spectrum

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (5) : 157-163.

WU Jin, QU Wenzhong, XIAO Li

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Abstract

A method for bolt loosening nonlinearity detection and location based on 3/2-D spectral analysis was proposed.The multi-scale method was used to analyze the mechanism of nonlinear phase coupling produced by bolt looseness, study the signal-processing process with 3/2-D spectral analysis and analyze the principle of its identifying nonlinear second harmonics.A bolt structure on an aluminum plate were taken as the test object, piezoelectric actuator/sensor elements bonded on the aluminum plate were used to perform tests, and 3/2-D spectral analysis was done for structural response signals to effectively judge the bolt’s connection state.In order to realize loose bolt’s positioning, the nonlinear index for bolt loosening was defined, and the radial basis interpolating function was introduced.The nonlinear index for response signals of the piezoelectric array bonded on the aluminum plate was obtained with tests, and the radial basis interpolating function was used to fit the damage location image.The test results showed that the proposed method can effectively detect bolt loosening nonlinearity and realize loose bolt’s positioning.

Key words

bolt loosening / 3/2-D spectral analysis / second phase coupling / radial basis interpolating function / damage positioning

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WU Jin, QU Wenzhong, XIAO Li. Bolt looseness nonlinearity detection and location based on 3/2-D spectrum[J]. Journal of Vibration and Shock, 2020, 39(5): 157-163

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