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一阶模态
    The vibration attenuation mechanism was expounded. The influence of different damping layer shear modulus and magnetic stiffness on the loss factor of beam for the first mode by MCLD treatment was evaluated.
    分析了不同阻尼层设置方式下 ,磁约束阻尼处理对系统一阶模态损耗因子的影响 ,阐明了磁约束的减振机理 ,分析了阻尼层剪切模量和磁刚度对磁约束处理减振效果的影响 .
    2) the first mode is dominant at primary axis, which reduce intersectional coupling;
    2)在敏感方向上,一阶模态起主导作用,其它模态的影响较小,有利于减小交叉耦合的影响;
    3) the three support structure of the shaft system made coupling between the first mode of the exciter rotor and the second mode of the generator rotor.
    3)轴系三支点的结构使得励磁机一阶模态与发电机二阶模态耦合
    On the other hand, the nonlinear geometric terms produce a hardening effect and dominate the planar response of the first mode.
    而梁的非线性几何项具有硬特性效应 ,主宰了系统的一阶模态响应 .
    For a case study of a flexible cantilever beam, multiple metrics method is used to solve the nonlinear differential equations and derive the nonlinear modulation equations for the combination of the principal parametric and 1/2 subharmonic resonance of the first mode.
    运用多尺度法 ,研究了匀转速、顺臂安装下悬臂梁的一阶模态主参激共振与外激励 1/ 2次亚谐共振同时作用时梁的一阶近似稳态响应。
    The results show that the rotating speed, whirling radius and excitation amplitude on the beam play important roles in the planar response of the first mode of the beam.
    结果表明 ,梁的一阶模态幅频特性将受到转速、旋转半径和激励幅值等参数变化的显著影响。
    The results indicate that, when the dynamic stiffness ratio of soil to structure is small enough, the SSI system tends to show the fundamental dynamic property of the first mode of vibration.
    分析了SSI体系中软土地基对上部结构动力特性的影响,指出了在土、结构相对动刚度比足够小时,软基SSI体系的基本动力特性:一阶模态化趋势;
 

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