The mathematical expression of this model is a second order non linear ordinary difference equation.
该模型的数学形式是一个非线性二阶常微分方程，利用有限差分方法进行求解。
The mathematical expression of transforming linear block diagram into state equation is derived.
文中推导了系统结构图和状态方程之间变换的数学表达式。
The mathematical expression of transforming linear block diagram into state equation is derived.
文中推导了系统结构图和状态方程之间变换的数学表达式。
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