自动门
自动门:改善阻尼二阶系统控制方式
发布时间:2014/10/16
自动门讯:
    增大放大器增益会导致系统的阻尼下降,虽可减小稳态误差,却恶化了误差响应的动态性能。
因此,等值不宜太小。通常只有增益可以调整,要同时满足稳态和动态两方面特性的要求是
困难的。这是因为:
     1)改变开环增益就相当于改变系统阻尼比的数值。但是,阶跃响应中的超调量和斜坡响
应中的稳态误差对值的要求正好相反,要取得一个合适的折中方案比较困难;
    2)即使能够找到合适的开环增益值,满足上述稳态和动态两方面的要求,也可能不满足系
统在扰动作用下的稳态误差要求;
    3)在高精度控制系统中,需要采用高增益使死区、间隙和摩擦等非线性因素的影响减到
最低程度,因此不能任意降低开环增益以换取较小的超调量。
    由于上述原因,必须研究其它控制方式,以改善系统的动态性能和稳态性能。
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