In order to avoid the dependence of mesh method on grids, a 3D global weak-form mesh-free method (MFM) is applied to study\nthe three-dimensional acoustic characteristics of silencers. For the expansion chamber silencers, the 3D acoustic modes are\nextracted and the transmission loss results are computed by using the 3D global weak-form (MFM), which is based on the radial\nbasis function point interpolation method (RPIM) for calculating the shape functions and Galerkin method for discretizing the\nsystem equation. The first 15 order 3D acoustic modes and TL results of a special expansion chamber silencer are presented to\nvalidate the computational accuracy of the proposed technique, and the relative errors are controlled within 0.5% by comparing\nwith the 3D finite element method (FEF) calculations. Additionally, the effects of axial modes on the acoustic characteristics are\ninvestigated, and the pass through frequencies can be eliminated to enhance the acoustic attenuation performance by locating the\nside branch outlet on the nodal lines of axial modes.
Loading....