虚功原理及其在工程实践中的应用

On the Theorem of Moment of Momentum for Velocity Instantaneous Center

重点研究了虚功原理在工程设计中的应用，利用虚功方程导出杆件结构位移的一般公式，并做了便于工程实际实用的简化．

The article is based on the theorem of moment of momentum for any motion point. It leads to the theorem of moment of momentum for a velocity instantaneous center on general situations. It further offers the condition with the same form between the theorem of moment of momentum for a velocity instantaneous center and the theorem of moment of momentum of a mass center.