Structural intensity analysis on irregular shells

A method is presented to assess the transmission path of vibration energy and to localize sources or sinks on shells with arbitrary shape, constant thickness and isotropic material properties. The derived equations of the structural intensity are based on the Kirchhoff-Love postulates and are formulated in terms of displacements, Lamé parameters, principal curvatures, and their partial derivatives with respect to the principal curvilinear coordinates. To test the accuracy of the method, two numerical models of thin shells with non-uniform curvatures were developed. The coordinates, displacements and principal curvature directions at the shell's outer surface were used to estimate the structural intensity vector fields and the energy density at the shell's middle surface. The power estimated from the surface integral of the divergence of the structural intensity over the source was compared to the actual power injected in the shell. The absolute error in both models did not exceed 1%, showing that, in theory, the method is able to handle the high-order spatial derivatives of the displacement and geometry data. The qualitative effect of varying the internal damping in the models on the energy transmission was also investigated.

Jaar van publicatie:2019

Trefwoorden:A1 Journal article

BOF-keylabel:ja

BOF-publication weight:1

CSS-citation score:1

Authors from:Higher Education

Toegankelijkheid:Open