Abstract：In order to overcome the shortage that traditional linear ultrasonic testing is insensitive to the closed cracks, the nonlinear ultrasonic testing research based on vibro-acoustic modulation(VAM) was studied and the time reversal(TR) method was used to focus nonlinear signal. Finite element software ABAQUS was used to simulate micro crack detection of aluminium tube based on VAM, the first order sideband of VAM signal was extracted by finite impulse response(FIR) filter and was reversed in the time domain. Then reloaded TR signal on the nondestructive tube model and carried out the time reversing focusing simulation with ABAQUS. The results show that the first order sideband is able to focus around original crack location, the diametrical arrangement of TR signals load position is superior to axial arrangement, and crack dimension and location can be measured base on the time reversal focusing imaging.
呼刘晨,郑慧峰,方漂漂,王月兵,曹文旭. 基于振动声调制和时间反转法的微裂纹定位检测研究[J]. 计量学报, 2017, 38(6): 744-748.
HU Liu-chen,ZHENG Hui-feng,FANG Piao-piao,WANG Yue-bing,CAO Wen-xu. Study of the Metal Micro Crack Location Based on Vibro-acoustic Modulation and Time Reversal Method. Acta Metrologica Sinica, 2017, 38(6): 744-748.
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2017, Vol. 38 
