Abstract
It is important to measure the defect of objects. The radiated sound from the impacted body has many types of information, and it also has the information of the defect. Therefore, in this study, we propose a method in order to identify the position and the size of the defect in the impacted body by measuring the radiated sound pressure. In the proposed method, we calculate the time dependence of the radiated sound pressure from the impacted body with the supposed defect by using FEM analysis. The defect position and size can be given in order to match the time dependence of the sound pressure with the measured sound pressure. In order to obtain much information involved in the defect, it is necessary to measure the sound pressure in the wide range. However, it is difficult to prepare hundreds of microphones to measure the radiated sound distribution. Thus, we constructed the measuring system of the sound pressure distribution by moving a microphone and applying the same impact force to the body. In this system, we can measure fictionally the sound pressure distribution on the plane over \(200\hbox { mm}\times 200\hbox { mm}\) area with \(2~\upmu \hbox {m}\) resolution. The efficiency of the proposed method is confirmed by some experiments.
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Iino, S., Yahiro, S., Nishikawa, T. et al. The identification of the cylindrical defect position and size by measuring the radiated sound pressure on the plane. Acta Mech 230, 1337–1345 (2019). https://doi.org/10.1007/s00707-017-2023-0
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DOI: https://doi.org/10.1007/s00707-017-2023-0