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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Ultrasonic inspection of studs (bolts) using dynamic predictive deconvolution and wave shaping
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Ultrasonic inspection of studs (bolts) using dynamic predictive deconvolution and wave shaping

机译：使用动态预测反褶积和波形整形对螺栓（螺栓）进行超声波检查

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Bolt degradation has become a major issue in the nuclear industry since the 1980's. If small cracks in stud bolts are not detected early enough, they grow rapidly and cause catastrophic disasters. Their detection, despite its importance, is known to be a very difficult problem due to the complicated structures of the stud bolts. This paper presents a method of detecting and sizing a small crack in the root between two adjacent crests in threads. The key idea is from the fact that the mode-converted Rayleigh wave travels slowly down the face of the crack and turns from the intersection of the crack and the root of thread to the transducer. Thus, when a crack exists, a small delayed pulse due to the Rayleigh wave is detected between large regularly spaced pulses from the thread. The delay time is the same as the propagation delay time of the slow Rayleigh wave and is proportional to the site of the crack. To efficiently detect the slow Rayleigh wave, three methods based on digital signal processing are proposed: wave shaping, dynamic predictive deconvolution, and dynamic predictive deconvolution combined with wave shaping.
机译：自1980年代以来，螺栓退化已成为核工业的主要问题。如果未能及早发现双头螺栓的细小裂纹，它们会迅速增长并造成灾难性灾难。尽管其重要性，但由于双头螺栓的复杂结构，对它们的检测是一个非常困难的问题。本文提出了一种检测并确定两个相邻螺纹牙顶之间牙根小裂纹的方法。关键思想是这样的事实，即模转换瑞利波在裂缝表面缓慢传播，并从裂缝和螺纹根部的交点转向换能器。因此，当存在裂纹时，在来自螺纹的大的规则间隔的脉冲之间检测到由瑞利波引起的小的延迟脉冲。延迟时间与慢瑞利波的传播延迟时间相同，并且与裂纹的位置成比例。为了有效地检测慢瑞利波，提出了三种基于数字信号处理的方法：波形整形，动态预测反卷积和动态预测反卷积与波形整形相结合。

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