关键词: 声学, 舱室结构, 振动, 噪声辐射, 有限元, 边界元

Abstract:

To solve the radiation noise problem of cabin structure, the vibration and acoustic radiation characteristics from the cabin was calculated by finite element and boundary element methods in time-domain. The FEM model of an analog cabin was established, and the modal test was done. The vibration mode is analyzed numerically and experimentally and validated the accuracy of this model. The experiment on vibration and sound radiation was done, and the acoustic pressure frequency response of the analog cabin was acquired. Transient response of the analog cabin structure was calculated by ANSYS. The response results of the BEM model were input to Virtual Lab, and the radiated acoustic field inside the analog cabin was calculated by indirect boundary element method. Through comparison, the result of simulation is consistent with the experimental data. It shows that this method is feasible and has theoretical guidance meaning for the control of civil aircraft cabin noise.