虚位移及其计算

On the Virtual Displacement and It's Caculation

本文在虚位移概念的基础上，将虚位移与函数的变分相结合，利用变分计算，较为系统地就虚位移与函数的变分。

This paper deals with combination of virtual displacement and variation of function. By meansof variational caculation we systematically discuss the relation between virtual dispacement and variation, necessary conditions required by vurtual displacement. Furthermore,a deduction is obtained, which leads to the kinbetic energy theorem of material particle system.