linear_mathematical_expression

1.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。
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2.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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