Research on Frequency Adaptive Optimization Method of Electromagnetic Acoustic Testing

doi:10.3901/JME.2019.14.011

Abstract

Abstract: Electromagnetic acoustic testing (EMAT) is susceptible to temperature, lift-off and the material of the tested subject, which makes the impedance characteristics and energy conversion efficiency of the transducer change. Therefore, the inspection results vary widely even with the same detection system and parameters but in different work conditions. The testing frequency is a key factor that needs to be optimized among the many factors that affect the testing performance. Normally, the frequency sweeping method is used to find the optimal inspection frequency in the laboratory environment. This method is extremely inefficient and difficult to be used in practice. A method based on the principle of linear Chirp for fast optimizing testing frequency of EMAT is proposed. Through the way of data processing, the testing signal of each frequency point in a frequency range can be extracted in a single excitation receiving process, thereby quickly optimizing and obtaining the optimal testing frequency. Further, the testing system adopting this method can adapt to changes in temperature, contact conditions, and objects to be inspected in the field, optimize the testing frequency in real time, and obtain the best detection effect.

Key words: adaptive, electromagnetic acoustic, influencing factors, parameter optimization, testing frequency

CLC Number:

ZHENG Yang, ZHOU Jinjie, ZHANG Zongjian, TAN Jidong. Research on Frequency Adaptive Optimization Method of Electromagnetic Acoustic Testing[J]. Journal of Mechanical Engineering, 2019, 55(14): 11-18.

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