本文選題：空間交會　切入點(diǎn)：變結(jié)構(gòu)控制　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：空間交會是一項(xiàng)廣泛應(yīng)用于在軌服務(wù)、在軌裝配與編隊(duì)飛行等復(fù)雜航天任務(wù)的基礎(chǔ)性技術(shù),由于其中的控制問題是保證自主交會成功的關(guān)鍵而吸引了許多研究者們的關(guān)注。在研究空間交會控制問題時會受到許多現(xiàn)實(shí)工程因素的制約,如在軌航天器除受中心引力作用外還會受到許多外部攝動力的作用,航天器執(zhí)行機(jī)構(gòu)的故障與時變特性等�；Ｗ兘Y(jié)構(gòu)控制是一種具有強(qiáng)魯棒性的非線性控制；相比于其他控制方法,滑�？刂圃谝种苹蛳Ｐ筒淮_定性與外部擾動上具有很強(qiáng)的能力。因而本學(xué)位論文的主要內(nèi)容是利用滑模變結(jié)構(gòu)控制理論在考慮必要工程約束的情況下提出適用于航天器自主交會的控制方案�，F(xiàn)實(shí)中絕大多數(shù)空間交會的參考軌道呈近圓形,因而本文將著重研究近圓軌道上航天器自主交會的控制方法。在動力學(xué)建模部分,本文由含攝動的非線性二體模型出發(fā),通過拉格朗日與泰勒級數(shù)展開進(jìn)行線性化,在并保留關(guān)于參考軌道偏心率的一階展開項(xiàng)后得到用于描述近圓軌道空間交會的動力學(xué)模型,其中參考軌道的非圓性與兩航天器所受攝動力的差值分別以時變參數(shù)項(xiàng)與外部擾動項(xiàng)的形式存在與模型中。針對存在攝動力擾動與執(zhí)行器飽和的空間交會,本文提出一種固定增益滑�？癸柡涂刂破�,利用滑�？刂埔种仆獠繑_動,通過固定增益避免推力器陷入飽和。此后針對執(zhí)行器輸出上限時變的情形,提出一種增益自適應(yīng)滑�？癸柡涂刂破�,利用白適應(yīng)的控制器增益避免了固定增益控制器由于預(yù)設(shè)增益過小造成的執(zhí)行器性能浪費(fèi)或過大引起的執(zhí)行器飽和。針對存在攝動力擾動與推進(jìn)系統(tǒng)故障的空間交會,本文提出一種復(fù)合型魯棒容錯控制方案。該方案由積分滑模輔助控制器與魯棒容錯保性能控制器復(fù)合而成。其中,積分滑模輔助控制器能夠消除攝動模型中的外部擾動項(xiàng)并對推力器故障具有容錯能力,魯棒容錯保性能控制律則能夠以最小成本鎮(zhèn)定含故障及時變參數(shù)的空間交會標(biāo)稱系統(tǒng)。在含有攝動的非線性二體模型中,本文對固定增益與增益自適應(yīng)滑�？癸柡涂刂破饕约蔼�(dú)立魯棒容錯保性能與復(fù)合魯棒容錯控制器進(jìn)行了對比仿真。仿真結(jié)果顯示,增益自適應(yīng)控制器與復(fù)合魯棒容錯控制器較其余控制器在航天器自主交會任務(wù)中具有穩(wěn)定性好、收斂速度快以及能量消耗小等優(yōu)點(diǎn)。
[Abstract]:Space rendezvous is a basic technology widely used in complex space missions such as in-orbit service, in-orbit assembly and formation flying. Since the control problem is the key to ensure the success of autonomous rendezvous, it has attracted the attention of many researchers. In studying the control problem of space rendezvous, it will be restricted by many practical engineering factors. For example, the in-orbit spacecraft will also be subjected to many external perturbation forces in addition to the central gravity force, and the fault and time-varying characteristics of the spacecraft actuator, etc. Sliding mode variable structure control is a nonlinear control with strong robustness. Compared with other control methods, Sliding mode control has a strong ability to suppress or eliminate model uncertainty and external disturbance. Therefore, the main content of this dissertation is to use sliding mode variable structure control theory to propose a suitable method considering the necessary engineering constraints. Control scheme for spacecraft autonomous rendezvous. In reality, most of the reference orbits of space rendezvous are nearly circular. Therefore, this paper will focus on the control method of spacecraft autonomous rendezvous in near-circular orbit. In the part of dynamics modeling, the nonlinear two-body model with perturbation is linearized by Lagrangian and Taylor series expansion. After preserving the first-order expansion term of the reference orbit eccentricity, a dynamic model for describing the space rendezvous of the near-circular orbit is obtained. The difference between the non-circularity of the reference orbit and the perturbation force of the two spacecraft is in the form of time-varying parameter term and external disturbance term, respectively. In this paper, a fixed-gain sliding mode anti-saturation controller is proposed. The sliding mode control is used to suppress the external disturbance and to avoid the thruster falling into saturation through the fixed gain. A gain adaptive sliding mode anti-saturation controller is proposed. The white adaptive controller gain is used to avoid the actuator saturation caused by the fixed gain controller which is caused by too small preset gain. In view of the spatial rendezvous between the perturbed disturbance and the propulsion system fault, the performance of the actuator is wasted or too large due to the presupposition gain. In this paper, a composite robust fault-tolerant control scheme is proposed, which is composed of an integral sliding mode auxiliary controller and a robust fault-tolerant guaranteed cost controller. The integral sliding mode auxiliary controller can eliminate the external disturbance in the perturbation model and has fault tolerance ability to the thruster fault. Robust fault-tolerant guaranteed cost control law can stabilize space rendezvous nominal systems with fault and time-varying parameters at minimum cost. In this paper, the fixed gain and gain adaptive sliding mode anti-saturation controller and independent robust fault-tolerant guaranteed cost controller and composite robust fault-tolerant controller are compared and simulated. The gain adaptive controller and the composite robust fault-tolerant controller have the advantages of better stability, faster convergence speed and less energy consumption than the other controllers in the autonomous rendezvous mission.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：V526;V448.2

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 盧偉;在軌服務(wù)航天器與失控目標(biāo)交會對接的相對位姿耦合控制[D];哈爾濱工業(yè)大學(xué);2012年

，

本文編號：1673212