modal expansion meaning in English
模态展式
Examples
- Based on the assumption of periodic rubbing force in rotor system , the rubbing forces onto each node of rotor system are estimated by modal expansion technique and the sub - harmonic decomposition of residual matrix between faulty and faulty - free vibration signals of rotor system through fft ( fast fourier transformation )
基于转子系统碰摩力的周期性假设，利用模态扩展方法，对故障和健康转子系统振动信号的残差矩阵进行傅立叶级数的分频谐波近似，估算得到转子轴承各节点的碰摩力。 - The submarine structure is simplified to single or double infinite cylindrical shell stiffened with rings , bulkheads and stringers , focusing on underwater sound radiation from the single shell . the shell motion is described by donnell ' s theory including excitation forces and reactions of rings , bulkheads , stringers and fluid , which leads to the fluid - structure coupling vibration equation . expressing displacements by velocities , applying modal expansion circumferentially and fourier transformation longitudinally result in the shell ' s modal equations of motion
壳体的运动方程采用较为简单的donnell理论描述，运动方程中包括了激励力、加筋结构(环肋、舱壁和纵骨)和流场对壳体的作用力，从而组成流场-结构的耦合振动方程，并进一步将方程中的位移用速度表示，然后沿轴线方向进行fourier变换，将速度和各项荷载沿圆周方向进行模态展开，得到了壳体振动的模态运动方程。