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。
The paper discusses the criterion for deciding virtual constraint and the sufficient and necessary conditions for the constraint existing in mechanisms.
平面机构中虚约束的存在，给制造加工和机构运动分析带来了诸多不便。
Virtual restraint in planar mechanism brings about many problems to machining and mechanism movement analysis.
通过引入虚任务区概念，将三维约束降为二维约束，有效地降低了决策变量的复杂性。
The virtual mission area concept was advanced to transform the constraints of three dimensions to those of two dimensions to decrease the decision-variable complexities.
次优门限算法以最优门限分析为基础，在虚警概率约束下使用牛顿迭代给出求解门限的递推算法。
For suboptimal method based on optimal threshold analysis, a recursive form of threshold selection using Newton iteration is developed with false alarm probability constraint.
次优门限算法以最优门限分析为基础，在虚警概率约束下使用牛顿迭代给出求解门限的递推算法。
For suboptimal method based on optimal threshold analysis, a recursive form of threshold selection using Newton iteration is developed with false alarm probability constraint.
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