Nonlinear and nonstationary detection of weak bridge signals based on the multiscale recurrence plot theory

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 123-128.

ZHANG Erhua1,2 SHAN Deshan2 LI Qiao2

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Abstract

In order to solve the problem that the weak dynamic test signals of bridge structure are easily submerged in noise and the non-linearity and non-stationarity are difficult to test, a new multiscale nonlinear and non-stationary detection analysis method was proposed by combining the improved empirical mode decomposition method and the recurrence plot theory.The weak signals were adaptively decomposed, and then each signal component was obtained.The nonlinear and non-stationary characteristic information of each signal component was analyzed by recurrence plots and recursive quantization analysis methods.The validity of the proposed method was verified by both the simulated signal and testing signal from real bridge structures.The results show that the multiscale nonlinear and non-stationary detection analysis method can effectively extract the nonlinear and non-stationary feature information from weak signals of bridges in strong noise environment and can be used for nonlinear and non-stationary detection of test signals from real bridges.
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Key words

bridge / non-stationarity / nonlinearity / detection / recurrence plot / recurrence quantification analysis

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ZHANG Erhua1,2 SHAN Deshan2 LI Qiao2. Nonlinear and nonstationary detection of weak bridge signals based on the multiscale recurrence plot theory[J]. Journal of Vibration and Shock, 2019, 38(16): 123-128

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