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。

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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。

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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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That motion detection in turn controls the velocity of the treadmill and interactions with the virtual world.

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