为了简化计算，引入了虚速度、虚功率的概念，并推导出虚功率原理。
In order to simplify calculating, concept of virtual velocity and virtual power are led into.
为了简化计算，引入了虚速度、虚功率的概念，并推导出虚功率原理。
In order to simplify calculating, concept of virtual velocity and virtual power are led into. The principle of virtual power is discussed.
对虚位移原理在运动学中的应用做了初步探讨，建立了“虚功率方程”。
This article approaches the application of the principle of virtual displacement to kine-matics, sets up the"virtual power's equation", and provides a new research method for kine-matics.
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