Computation of Acoustic Far Field Scattering Cross Section from Plain and Intersecting Thin Bodies

In this work, node based basis functions are used to solve the acoustic scattering from plain thin bodies like plates, discs; and intersecting thin bodies like fins on a cylinder. Node based basis functions are defined on the vertices of triangles generated by triangular patch modeling, and these functions are used to define the unknown source distribution. Also the same functions are used as testing functions in the method of moment's solution. Three kinds of nodes were treated for defining the basis functions, namely, boundary node, non-boundary node and non boundary intersecting node. Also, three kinds of bodies were considered for the acoustic scattering, namely closed bodies, open bodies and intersecting bodies. A common numerical solution procedure is developed for the three kinds of bodies using the node based basis functions. The numerical solutions developed are validated with closed form solutions wherever possible. Also the numerical solutions were used to predict the far fields of complex bodies.