The necessary data for analysis often runs out, which cannot provide reliable parametric variation;
主要包括分析需要的数据经常缺乏，无法提供可靠的参数变化；
In this paper, parametric variation method is used in kinematic equation of series excitation direct current motor with different turning velocities.
本文用参数变异法给出串激直流电动机在不同转速情况下的运动方程的解析解，以拓宽人们分析这类问题的思路。
This paper studies the influence of the parametric variation of spring model on motor vehicle vibration, and analyses the characteristics of in a partial locked state.
具体研究了板簧模型参数变化对振动的影响，并对板弹的部分锁止状态进行了分析。
A novel method named equivalent current density based on finite element method was developed for parametric variation problem of signal transmission caused by the external environment.
针对电信号的有效传输受外界环境引起自身参数变化的问题，提出了一种基于有限元方法求取传输参数的等效电流密度法。
This method keeps the location base of form feature invariance during the feature modeling and editing, and it is suitable for feature parametric variational design and topological variation.
该方法使特征定位基准在特征造型过程中保持不变，且不随特征定位约束参数的改变而变化，能很好地满足参数化变动设计与拓扑结构变异的要求。
This method keeps the location base of form feature invariance during the feature modeling and editing, and it is suitable for feature parametric variational design and topological variation.
该方法使特征定位基准在特征造型过程中保持不变，且不随特征定位约束参数的改变而变化，能很好地满足参数化变动设计与拓扑结构变异的要求。
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