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.
建立了含有虚约束的多相并列平行曲柄机构受力分析模型。在此基础上分析计算了三环减速器的轴承载荷和高速轴曲柄上的转矩；
The load of planetary bearings and the moment in the high speed shafts are analyzed and some suggestions about the structure type and design parameters of the three ring reductor were a…
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.
以上报盘为虚盘(无约束力)，所有订货将以我方书面接受为准。
The above offer be make without engagement and all order will be subject to our write acceptance.
虚位移是在约束容许的条件下可能发生的。
The virtual displacement is an arbitrary one permitted by the constraints at a fixed time.
虚速度剖面制作质量的好坏主要取决于提取子波时测井约束的效果、水平叠加偏移剖面的质量、叠加速度的选取和平滑作用以及各处理参数的选择。
The quality of psedu-velocity depends on the result of log-constraining when wavelet was obtained, the quality of original stacking migration section and the selection of all processing parameters.
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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