自动门
自动门:非线性控制系统
发布时间:2014/3/25
自动门讯:
非线性控制系统
    系统中只要有一个元部件的输入一输出特性是非线性的,这类系统就称为非线性控制
系统,这时,要用非线性微分(或差分)方程描述其特性。非线性方程的特点是系数与变量
有关,或者方程中含有变量及其导数的高次幂或乘积项.
    严格地说,实际物理系统中都含有程度不同的非线性元部件,例如放大器和电磁元件
的饱和特性,运动部件的死区、间隙和摩擦特性等。由于非线性方程在数学处理上较困难,
目前对不同类型的非线性控制系统的研究还没有统一的方法。但对于非线性程度不太严
重的元部件,可采用在一定范围内线性化的方法,从而将非线性控制系统近似为线性控制
系统。
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