非平面構造物の振動インテンシティ計測法の検討

抄録

In case that structures are simple homogenous uniform such as thin plates or beams, the structure-borne sound can reduce on the basis of the structural intensity. Generally, structures have complex surface and it is difficult to measure structural intensity of complex surface structures because of the stress, moments and in-plane displacement. This paper derives structural intensity of thin shallow shells. As a result of this structural intensity formula, the out-of-plane components such as shear, bending and twisting have no concern with curvature of a shallow shell. Therefore, this paper make comparison with finite element method and finite difference method about its shear and bending components to verify this result. This paper also investigates the ratio of in-plane to out-of-plane of shallow shell to apply plate theory of structural intensity to shallow shells, and verify the direction error of structural intensity between the original structural intensity distribution and the structural intensity that applied plate theory to introduce how we can utilize the plate theory to shallow shells. As a result of this verification, Plate theory of structural intensity can compute approximately structural intensity of shallow shells provided that the shallow shell’s curvature is small, in brief, the out-of-plane components are dominant.