Loosening discrimination of a bolted connector under high-temperature vibration environment based on time-frequency analysis

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 205-210.

CAO Zhifu1,2,TAN Zhiyong3, JIANG Dong1,4,HE Dingding1,2,FEI Qingguo1

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Abstract

Here, vibration features of a certain type composite bolted connector were studied under high-temperature vibration environment to provide theoretical and test basis for judging its loosening features.Using a vibration control system, a temperature control system and a non-contact laser measurement system, vibration tests of the connector under 1 000 ℃ high-temperature environmentwere conducted.The short-time Fourier transformation method was applied to extract its vibration response characteristic quantities under high-temperature environment.The fundamental natural frequency, the amplitude of the second natural frequency component and the amplitude ratio between those of the second one and the fundamental one of the bolted connecter were used to judge its loosening state.The test results showed that under the condition of its macroscopic loosening phenomenon being not obvious, the proposed method can be used to comprehensively evaluate loosening features of the composite bolted connector under high-temperature vibration environment.

Key words

Composites / High temperature vibration / Connection loosening / Time-frequency analysis

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CAO Zhifu1,2,TAN Zhiyong3, JIANG Dong1,4,HE Dingding1,2,FEI Qingguo1. Loosening discrimination of a bolted connector under high-temperature vibration environment based on time-frequency analysis[J]. Journal of Vibration and Shock, 2019, 38(17): 205-210

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