In order to improve the accuracy and efficiency of structural impact monitoring, this paper proposes a beam focusing impact localization method based on array sensor scanning. The circular array sensor arrangement method is adopted. Perform software-level impact damage monitoring on large-scale structures through different linear arrays forming a circular array, The effectiveness and practicability of the method are verified through the experimental research.
For the mechanical industry, bolts are an important guarantee for the safety of connection between parts. The traditional method for monitoring bolt loosening is mainly through human judgment, but this method has a large error and cannot be monitored online. At present, the dynamic change process of the bolt loosening can be learned in more detail through the Lamb wave monitoring technology. In this paper, the piezoelectric transducer(PZT) is used to generate the Lamb wave in aluminum structure to monitor the looseness of the bolt on it. The signal with bolt looseness information received by another PZT is analyzed and processed. The S0 modal of the signal is chosen to extract the amplitude of it. After analysis it can be seen that the amplitude of the S0 modal reduces as the bolt gone loose. The relationship between the amplitude and bolt looseness have been drowned. And the functional relationship is presented.
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