Sound Radiation of Vibrating Plate in Different Hollow Bodies
|關鍵字:||有限元素法;流固耦合;消音器;finite element method;fluid-structure interaction;muffler|
This thesis studies the sound propagation in different hollow bodies and the factors that can reduce the sound pressure level inside or at the exits of the bodies. The contents of the thesis consist of two parts. In the first part, the finite element code ANSYS is used to simulate the sound radiation of a vibrating plate and sound propagation in open space or a hollow structure. The results of ANSYS are compared with the experimental data obtained in this study. It has been found that the simulation can predict the performance of the speaker well in open space and in muffler as well. In the analysis of sound propagation in pipes, we propose a simplified analytical model using surface impedance to simulate surface sound-absorbing phenomenon of the pipe. The proposed method can effectively reduce the computing time for solving the problem. Compared with the theoretical formula available in the literature, the accuracy of the present finite element model for sound propagation in pipes has been verified by the previous solutions. In the second part, the effects of the pipe geometry and the wall sound absorption coefficient on the noise elimination of the pipes are studied. According to the results obtained in the ANSYS simulation, the parameters of the pipes that can have significant effects on the noise elimination of the pipes are identified.
|Appears in Collections:||Thesis|