中文摘要：

在基于声辐射模态理论的结构声有源控制中，主导辐射模态的确定及抵消策略是至关重要的，它直接决定次级力源的优化布放及有源控制的效果。以往研究中对于主导辐射模态的认识是模糊而片面的，现对该问题进行了深入分析。首先基于辐射模态理论和振动模态的叠加性，结合辐射模态幅度和辐射效率，确定了结构在不同的激励频率（振动模态）下对应的主导辐射模态，然后在此基础上对次级力源进行了优化布放，最后用一系列的计算机仿真实例验证了理论结果的正确性。

英文摘要：

In the active structural acoustic control based on radiation modes, the cancellation of the dominant radiation modes and determination of the arrangement of secondary forces are of virtual important. In this paper, first, the dominant radiation modes corresponding to different structural modes or frequencies are determined according to the radiation efficiency and radiation mode amplitude which is dependent upon the structural and radiation mode shapes. Second, an effective active control strategy and the arrangement of the secondary forces are obtained based on dominant radiation modes. Finally, a number of computer simulations are performed and corresponding reduction in the radiated sound power are achieved. The results demonstrate the feasibility of the proposed active control strategy and arrangement of secondary forces.