PROSOFT MVI94-GSC-E 模塊
PROSOFT MVI94-GSC-E 模塊
PROSOFT MVI94-GSC-E 模塊
前饋與反饋的區(qū)別有哪些? |
答:(1)控制依據(jù):反饋控制的本質(zhì)是“基于偏差來消除偏差”,前饋控制是“基于擾動(dòng)消除擾動(dòng)對被控量的影響”。
(2)控制作用發(fā)生時(shí)間方面:反饋控制器的動(dòng)作總是落后于擾動(dòng)作用的發(fā)生,是一種“不及時(shí)”的控制;擾動(dòng)發(fā)生后,前饋控制器及時(shí)動(dòng)作。
(3)控制結(jié)構(gòu)方面:反饋為閉環(huán)控制,存在穩(wěn)定性問題,即使閉環(huán)環(huán)節(jié)中每個(gè)系統(tǒng)都是穩(wěn)定的,但閉環(huán)后穩(wěn)定與否,還需要進(jìn)一步分析;前饋屬于開環(huán)控制,各環(huán)節(jié)穩(wěn)定,系統(tǒng)必然穩(wěn)定。
(4)校正范圍方面:反饋對各種擾動(dòng)都有校核作用;前饋,只對被校核的前饋擾動(dòng)有校正作用,其他則沒有。
(5)控制規(guī)律方面:反饋通常是P PI PD PID等典型規(guī)律;前饋控制規(guī)律較為復(fù)雜,不好掌握。
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