The paper discusses the criterion for deciding virtual constraint and the sufficient and necessary conditions for the constraint existing in mechanisms.
本文论述了机构中存在虚约束的充分必要条件及虚约束的判定准则。
On-demand manufacturing could eliminate that constraint, leading to a world where products are always available, nothing ever gets discontinued, and the virtual shelves are always stocked.
按需制造或能去除这种限制，并将我们带向另一个世界，在那里，产品随处都有，永不断货，虚拟的货架也总是满满当当的。
Assembly constraint is the key information for supporting the assembly operation in distributed virtual environments.
装配约束是用来支持分布式虚拟环境中装配交互操作的关键信息。
The virtual assembly environment (VAE) based on constraint recognition and mixed data model was presented.
基于约束识别和混合建模思想开发了一个虚拟装配系统（VAE）。
In order to make human motion simulation more realistic in Virtual Reality on PC platform, this paper introduces an improved method of modeling human body as a tree with constraint joints.
为了能在基于PC平台的虚拟现实中实现更具真实感的人体运动仿真，该文提出一种改进的约束求解方法，将人体建模为基于约束关节树的骨骼结构。
The determination of freedom less than the actual one may be find implicit constraint properly on the basic of the given one in using the virtual work principle to solve the problems.
由虚功原理解题时可在题中给定约束的基础上，适当考虑隐含约束，确定比实际少的自由度。
Employing the virtual displacement principle and considering constraint conditions of material interface, the stiffness matrix and equivalent load vector for this element are established.
应用虚位移原理和结合考虑材料交界面上的约束条件，文章建立了接触单元的刚度矩阵和等效荷载向量。
The partner selection problem with bid cost and completion time factors with a due date constraint is a fundamental problem in virtual enterprises.
具有项目投标价格和完工时间因素的带工期约束的伙伴选择问题是企业动态联盟的基本问题，证明了该问题是NP完全问题。
A motion guidance method based on semantics recognition and constraint recognition is provided to help the user move or rotate the parts in the virtual environment freely and precisely.
通过语义识别捕捉虚拟装配过程中用户交互意图，进行装配零部件的运动引导与精确定位，使得用户能够在虚拟环境中自如地、准确地进行装配定位。
A motion guidance method based on semantics recognition and constraint recognition is provided to help the user move or rotate the parts in the virtual environment freely and precisely.
通过语义识别捕捉虚拟装配过程中用户交互意图，进行装配零部件的运动引导与精确定位，使得用户能够在虚拟环境中自如地、准确地进行装配定位。
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