自动门
自动门:运动的模态
发布时间:2014/4/23
自动门讯:
运动的模态
    在数学上,线性微分方程的解由特解和齐次微分方程的通解组成。通解由微分方程的
特征根所决定,它代表自由运动。
    控制系统的微分方程是在时间域描述系统动态性能的数学模型,在给定外作用及初
始条件下,求解微分方程可以得到系统的输出响应。这种方法比较直观,特别是借助_下电
子计算机可以迅速而准确地求得结果。但是如果系统的结构改变或某个参数变化时,就要
重新列写并求解微分方程,不便于对系统进行分析和设计。
    用拉氏变换法求解线性系统的微分方程时,可以得到控制系统在复数域中的数学模
型——传递函数。传递函数不仅可以表征系统的动态性能,而且可以用来研究系统的结构
或参数变化对系统性能的影响.经典控制理论中广泛应用的频率法和根轨迹法.就是以传
递函数为基础建立起来的,传递函数是经典控制理论中最基本和最重要的概念。
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