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。
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。
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。
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