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。
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.
对齿轮进行模态特性分析时，研究了齿轮的振动是低阶模态起主导作用，为齿轮进一步的动态分析做好准备。
When carrying on the modal analysis, studies that the low step vibration gets up the leading role, prepares for the further dynamic analysis.
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