The state variable approach of modern control theory provides a uniform and powerful method of representing systems of arbitrary order, linear or nonlinear, with time-varying or constant coefficients.
现代控制理论的状态变量法提供了一种统一、高效的方法来描述具有任意阶次、线性或非线性、时变或常系数的各种系统。
The paper investigates the solution of a class of linear homogeneous differential equations with varied coefficients and methods of decreasing order of the DE.
探求一类变系数方程的求特解的方法以及对方程的降阶。
In this paper, the truncation errors of the height anomaly and vertical deflection are estimated, and the approximate expressions of the higher order truncation coefficients are derived.
本文对高度异常及垂线偏差的截断误差进行了估计，导出了高阶截断系数的近似表达式。
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