Solving the intensity potential problem by using the boundary element method

Paper i proceeding, 2010

Robust tools for prediction of radiated sound power in the high-frequency range from encapsulated sources are of interest in machinery and vehicle noise control. These encapsulations form partial enclosures yielding exterior problems that may be solve by using the intensity potential approach. The intensity potential approach is briefly presented and the boundary element method to solve the resulting Poisson equation with appropriate boundary conditions is discussed in detail. The boundary element method is a suitable solution strategy since only surfaces of objects has to be discretised and the boundary condition at infinity is exactly fulfilled. Results in 1/3-octave bands show that the method is very applicable for estimation of the global radiated sound power in one-third-octave bands in the high-frequency range, but that the directivity of the radiation pattern is underestimated.