unity virtual velocity 单位虚速度
principle of virtual velocity 虚速度原理
virtual value of vibration velocity 振动速度有效值
virtual variation of generalized velocity 可能速度虚变更
virtual-equivalent velocity diagram 假想等价速度三角形
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。
The effect of punch virtual velocity and sheet virtual density on the sheet strain energy was studied in this paper.
从理论上分析了凸模虚拟速度和板料虚拟密度对薄板变形能的影响。
In order to simplify calculating, concept of virtual velocity and virtual power are led into. The principle of virtual power is discussed.
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。
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