基于小波变换电磁应力检测方法的研究

Research on Electromagnetic Stress Testing Based on Wavelet Transform

电磁应力检测是基于法拉第电磁感应原理,利用金属材料的逆磁致伸缩效应实现对铁磁材料应力集中区的无损检测。该法体现了检测准确、应用灵活和成本低等特点,但在实际应用过程中容易受到外界干扰。论文利用离散小波分析方法对采集的数据进行处理,研究结果表明:基于小波变换的电磁应力检测系统在提高了检测精度的同时,更加直观地反应了应力集中情况。试验得到的测量结果与金属磁记忆方法和超声波方法的测量结果吻合程度达90%以上。

This paper proposed an effective detection method based on the principle of electromagnetic induction Faraday for stress concentration area of ferromagnetic materials throughout the research of metal materials inverse magnetostrictive effect mecha- nism. The method embodies high precision, flexible application and low cost, but it is vulnerable to outside interference in the process of actual application. The use of discrete wavelet analysis method to process the data improves the measuring accuracy, and reflects the stress concentration directly. The experiments confirmed the electromagnetic stress testing method was feasible and valid and more than 90% of the resuhs is consistent with that of metal magnetic memory （MMM）technique and the ultrasonic method.