应用有限元及边界元方法，以四边简支的某型微车尾门板外板简化模型为研究对象，讨论改变薄板厚度、刚度、在低阶模态“腹点”处增加质量三种方式对于模态辐射效率（20 Hz～100 Hz）的影响规律。通过对该车车内低频声学性能的分析与整改工作，验证应用模态耦合辐射效率指导车内低频声学问题整改的可行性。%The rear door of a mini-car was simplified as a 4-edge simply supported plate, and its computation model was established by means of the finite element method and boundary element method. The influence of thickness and stiffness changing of the plate and the additional mass at the abdominal point of the low-order modals on the modal radiation efficiency (20 Hz-100 Hz) was discussed. Through the analysis and rectification for the interior low-frequency acoustic performance of the car, the feasibility of using modal coupling radiation efficiency to guide the rectification of interior low-frequency acoustic features was verified.
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