在分析力学里，给定的瞬时和位形上，虚位移是符合约束条件的无穷小位移。由于任何物理运动都需要经过时间的演进才会有实际的位移，所以称保持时间不变的位移为虚位移。
The methods based on virtual work principle are more easily affected by the gap mesh strategy under light loads. Accordingly, the Maxwell stress method should be taken under light load conditions.
研究表明当积分路径位于相同气隙层时,积分路径的形状对传统麦克斯韦应力法计算结果的影响不大;低负荷时基于虚位移原理的计算方法容易受到气隙剖分策略的影响,因此在低负荷状态下,应尽量采用麦克斯韦应力法。
参考来源 - 汽轮发电机电磁转矩计算方法的对比·2,447,543篇论文数据，部分数据来源于NoteExpress
令三条折断线的相交处有一虚位移。
Let the junction of the three fracture lines have a virtual displacement .
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.
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