連成極薄円筒殻に現れる面内曲げ変形振動の線形振動実験と解析

抄録

The author proposed the pipe diagnosis technology using the eigen frequency of the in-plane bending vibration mode in a previous paper. However, there is a problem that conventional study including un-known factor about coupled behavior of a lots cylindrical shell. In this paper, dependency of the number of connections in eigen frequency of the coupled cylindrical shells is considered. Especially, following cases are considered, bi-coupled, tri-coupled, quad-coupled, sex-coupled, oct-coupled, respectively. At first, the vibration experiment is introduced using thin cylindrical shells. Each shell is connected by specified boundary condition that is composed by aluminum tape. Moreover, the frequency response functions are measured using by the exciter and the acceleration sensor. As the result, resonance peak is obtained near the frequency bands of two-dimension ring theory, in case of oct-coupled cylindrical shell. Moreover, the eigen frequencies are good agreement with the theoretical values based on the two-dimensional ring and three-dimensional shell, respectively. In addition, the resonance peak of two-dimension ring is clear obtained by the increasing the number of connections.