两方程对应的特征方程是恒等的。
The characteristic equations of the two equations are identical.
于是，在采用了线性形状函数来表达的位移分量以后，应力分量对运动方程的贡献必恒等于零。
Thus, if we use such form functions to represent the displacement components, the effect of internal stresses to the equations of motion vanishes identically.
通过一系列的坐标变化和近恒等变换，将电力系统的动态方程简化成三阶规范形，从而得到系统的分岔方程。
The dynamical equations of the system are simplified to a3-order normal form with a series of coordinate and approximately identical transformations, and a bifurcation equation is thus obtained.
通过一系列的坐标变化和近恒等变换，将电力系统的动态方程简化成三阶规范形，从而得到系统的分岔方程。
The dynamical equations of the system are simplified to a3-order normal form with a series of coordinate and approximately identical transformations, and a bifurcation equation is thus obtained.
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