Numerical simulation of in-vehicle sound field under conditions of open or closed car windows

Liang Linda, Guangzheng Yu, Le Yu
2019 Proceedings of the ICA congress  
As computation technology develops, sound field numerical simulation in-vehicle has attracted more and more attention. However, it is difficult to simulate sound field in-vehicle at high frequency by using wave-equation-based numerical methods, such as finite element method (FEM), finite difference in time domain (FDTD), etc. To extend the region of effective frequencies, a combined method consisting of finite element method (FEM) and ray-tracking method can be used to simulate the sound field
more » ... te the sound field in a car. Even so, the combination of the spectrum at the segmentation frequency between two methods still remains a well-known problem and is worthy of investigating. In this work, only the improved FEM was adopted to simulate the in-vehicle sound field. Through an optimized car model with smoothing fine structures and non-uniform meshing grids, the computation was optimized and the effective frequency was extended up to 4 kHz. Further, sound field distributions under conditions of open or closed lateral front windows (the condition of open windows is approximated by an absorptive boundary) were simulated and analyzed, so as to validate the optimized car calculation model and numerical method.
doi:10.18154/rwth-conv-238946 fatcat:kzy2c2mcvvg6lfq46n2engl7p4