主要贡献模态 dominant contribution modes
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对流层和平流层主要模态之间的耦合。
Coupling between Tropospheric and Stratospheric Leading Modes.
固有频率和振型是反映结构动力特性的主要模态参数，是评价桥梁动力性能的重要依据。
The natural frequency and vibration mode are the principal modal parameters representing structure dynamic behavior as well as the important basis for evaluating bridge dynamic performance.
分析了发动机振源对车架振动的影响，使车架主要模态的自振频率避开了发动机转速范围；
Then the author analyses the effect of the frame vibration and tries to make the natural frequency of vibration beyond the range of engine revolution rate.
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