Transmission characteristics analysis for mine tunnel with metallic wind bridge using hybrid MM/FEM approach

The transmission characteristics of tunnel with wind bridge is analyzed with a combined method which involves mode matching (MM)/finite element method (FEM). The hybrid approach combines the computational efficiency of the modal analysis with the versatility and flexibility of FEM and can be used to accurately model discontinuous tunnel with arbitrary cross section, where modal expansions cannot be derived analytically. The procedure is based on the edge element expansion of the transverse field components for the direct calculation of the coupling integrals involved in the MM formulation. Numerical results are presented to show the validity and the accuracy of the method.