...s 虚位移(virtual displacement)：加在物体上，满足约束条件的虚构微小位移； 虚位移原理 ( Principle of Virtual Displacement ) ：处于平衡状态的刚体，外 力系在任意虚位移上所作的虚功总和为零。
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一种计算物体固有频率的方法 关键词：虚位移原理 变形能 固有频率 [gap=437]Keywords: virtual displacement principle；deformation energy；natural frequency
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虚位移动原理 principle of virtual displacement
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筏板的控制方程由薄板理论和虚位移原理得到。
The governing equations of the raft are obtained based on the thin plate theory and the virtual work principle.
根据虚位移原理，推导出基于矢量磁势的电磁力计算公式。
According to the principle of virtual-work, the formula of electromagnetic force based on magnetic vector potential is deduced.
用证明古典虚位移原理的传统方法证明虚位移原理（扩大）。
The extended principle of virtual displacements is also proved by another method, which is used customarily to prove the classical one.
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