运载火箭POGO主动抑制的LQR控制器设计  

Design of LQR Controller for Active POGO Suppression of Launch Vehicle

作　　者：赵旺 刘锦凡[3] 谭述君 毛玉明[3] 吴志刚 ZHAO Wang;LIU Jin-fan;TAN Shu-jun;MAO Yu-ming;WU Zhi-gang(State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,Dalian 116023,China;Liaoning Key Laboratory of Aerospace Advanced Technology,Dalian University of Technology,Dalian 116023,China;Aerospace System Engineering Shanghai,Shanghai 201109,China)

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,大连116023 [2]大连理工大学辽宁省空天飞行器前沿技术重点实验室,大连116023 [3]上海宇航系统工程研究所,上海201109

出　　处：《强度与环境》2021年第1期47-56,共10页Structure & Environment Engineering

基　　金：国家自然科学基金面上项目(11972101,11872381),中央高校基本科研业务费(DUT18GF111)。

摘　　要：针对传统蓄压器难以满足大型捆绑火箭的Pogo抑制要求的问题,本文提出了基于LQR控制器设计的Pogo主动抑制方法。以采用低温液氧/煤油补燃循环发动机的某运载火箭为研究对象,建立了Pogo主动控制单元模型,导出了Pogo控制系统的状态空间模型;以泵入口压强最小为指标,设计了LQR全状态反馈控制器和部分状态反馈控制器,实现运载火箭Pogo振动的主动抑制;进而研究了控制器尺寸及安装位置对控制效果的影响。最后通过对某型号运载火箭Pogo主动抑制设计的稳定性分析和时域仿真,表明所设计的Pogo主动抑制器有效地提高了系统阻尼、抑制了Pogo振动,对模型偏差具有很强的鲁棒性,优于传统的蓄压器设计;并且对控制器尺寸和安装位置不敏感,有利于工程实现。Aiming at the problem that traditional accumulators cannot meet the requirements for Pogo suppression of large strap-on launch vehicles.,an active Pogo suppression method based on LQR controller design is proposed.The active control unit model of Pogo systemic established for a launch vehicle with low temperature liquid oxygen/kerosene refuel cycle engine,by which the state space model of Pogo control system isderived.With the minimum pump inlet pressure as the performance index,the LQR full state feedback controller and partial state feedback controller are designed to realize active Pogo suppression,respectively.Furthermore,the influence of controller size and installation position on the control performance is studied.Finally,the stability analysis and time-domain simulation of the active Pogo suppression design of a certain launch vehicle are implemented.Results show that the proposed active Pogo suppression design has strong robustness and is superior to the traditional accumulator design.And the control performance is not sensitive to the controller size and installation position,which is beneficial to engineering implementation.

关 键 词：Pogo振动 稳定性 主动抑制 LQR 鲁棒性 

分 类 号：V475.1[航空宇航科学与技术—飞行器设计]