In this dissertation , a kind of linear time invariant systems with unmodeled dynamics and nonlinear uncertainties are considered by using backstepping approach and variable structure control algorithm . also another kind of linear time varying systems are studied based on the same method 本文主要利用backstepping方法與變結(jié)構(gòu)控制方法,研究了有未建模動(dòng)態(tài)及不確定非線性項(xiàng)的線性時(shí)不變系統(tǒng),以及輸入通道帶有干擾的線性時(shí)變系統(tǒng)的控制器設(shè)計(jì)問題
The current control approaches are based on frequency domain methods such as pid control which assumes linear time invariant system dynamics . the advantages of these approaches are simplicity and ease of stability and robustness analysis . however , the decrease in performanc e and poor efficiency translates to additional payload and cannot meet the demand of current spacecraft control 當(dāng)前飛行器主要的控制方法是基于近似時(shí)不變線性系統(tǒng)的頻域分析法(如pid控制) ,這種方法的優(yōu)點(diǎn)是簡單且易于穩(wěn)定性和魯棒性分析,但它所達(dá)到的低性能和低效率卻轉(zhuǎn)化成了飛行器控制過程的附加載荷,還遠(yuǎn)不夠滿足當(dāng)前飛行器控制的要求。