MDX61B1320-503-4-00 只要被调量变化,输出就变化;被调量不变化,不管静态偏差有多大,输出也不会变化。
上面5条推论很重要,请大家牢牢记住。记住不记住其实没有关系,只要你能把它溶化在你的思想里也行。
溶化了么?那我出个思考题:
1、被调量回调的时候,输出必然回调么?
2、被调量不动,设定值改变,输出怎么办?
3、存在单纯的比例调节系统么?
4、纯比例调节系统会静差么?
第一条回答:是。
第二条回答:相当于被调量朝相反
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方向改变。你想啊,调节器的输出等于输入偏差乘以一个系数,设定值改变就相当于设定值不变被调量突变。对吧?
第三条回答:是。在电脑出现之前,还没有DCS,也没有集中控制系统。为了节省空间和金钱,对于一些简单的有自平衡能力的调节系统,比如水池水位,就用一个单纯的比例调节系统完成调节。
第四条回答:否。单纯的比例调节系统可以让系统稳定,可是他没有办法静态偏差。那么怎么才能静态偏差呢?依靠积分调节作用。
MDX61B1320-503-4-00
MDX61B1320-503-4-00