Cointegration approach for the temperatur eeffect compensation in EMI damage detection

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (18) : 128-134.

LI Xiujuan，QU Wenzhong，XIAO Li

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Abstract

In recent years, the piezoelectric high-frequency electromechanical impedance method (EMI) has been widely used in the research of structural health monitoring and damage detection.Due to the environmental temperature variation, in the impedance spectrum, the frequency shift and amplitude variation, will usually occur, resulting in false diagnosis.The cointegration method was introduced to eliminate the temperature effects.The ADF test and Johansen test were used to determine the degree of non-stationary and cointegrate the non-stationary peak frequency series of the temperature influenced impedance spectrum into a stationary residual series.The EMI detection experiment for simulating the damage of a steel plate under a temperature varying environment was carried out by using the high-frequency active excitation of the piezoelectric sensor.The experimental results show that the structural damage leads to a sudden change in the cointegrated residual series, and its occurrence can be accurately characterized.

Key words

structural health monitoring / electromechanical impedance / environmental temperature / time series / cointegration

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LI Xiujuan，QU Wenzhong，XIAO Li. Cointegration approach for the temperatur eeffect compensation in EMI damage detection[J]. Journal of Vibration and Shock, 2019, 38(18): 128-134

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