音圧の測定による平板表面の加速度の同定に関する研究

抄録

It is important for industrial products to measure the displacement and stress in impacted objects. The time-dependence of the displacement can be given by the acceleration on the surface of the objects. On the other hand, the sound pressure, which is generated from the surface of the object, contains the information of the acceleration of the surface. Then, the acceleration at the surface of the object can be given by the generated sound pressure, which can be measured by non-contact measurement. Therefore, the time-dependence of the displacement and stress could be given by measuring the sound pressure from the objects. In this study, we proposed the method to identify the distribution of the acceleration on the surface of the plate by measuring the sound pressure. At the first step of the study, the acceleration on the surface is distribute along the x direction only. This acceleration is denoted with the power series expansion. The relationship between the coefficients of the power series and the sound pressure is obtained theoretically. Thus, the time-dependence of the surface acceleration is given by using sound pressure. In order to confirm the proposed method, some artificial experiments by using FEM are proceeded.