LPV modeling and controller design for body freedom flutter suppression subject to actuator saturation  

作　　者：Wei TANG Yu WANG Jiawei GU Zhiwei SUN 

机构地区：[1]School of Automation,Northwestern Polytechnical University,Xi’an 710129,China [2]School of Automation Science and Electrical Engineering,Beihang University,Beijing 100083,China [3]Research Institute of Unmanned Aerial Vehicle,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Chinese Journal of Aeronautics》2020年第10期2679-2693,共15页中国航空学报（英文版）

基　　金：the National Natural Science Foundation of China(No.61573289);Space Science and Technology Fund,and Natural Science Basic Research Plan in Shaanxi Province of China(No.2019JM042);Fundamental Research Funds for the Central Universities of China(No.3102019ZDHKY11)。

摘　　要：In recent years,the Active Flutter Suppression(AFS)employing Linear ParameterVarying(LPV)framework has become a hot spot in the research field.Nevertheless,the flutter suppression technique is facing two severe challenges.On the one hand,due to the fatal risk of flight test near critical airspeed,it is hard to obtain the accurate mathematical model of the aeroelastic system from the testing data.On the other hand,saturation of the actuator may degrade the closed-loop performance,which was often neglected in the past work.To tackle these two problems,a new active controller design procedure is proposed to suppress flutter in this paper.Firstly,with the aid of LPV model order reduction method and State-space Model Interpolation of Local Estimates(SMILE)technique,a set of high-fidelity Linear Time-Invariant(LTI)models which are usually derived from flight tests at different subcritical airspeeds are reduced and interpolated to construct an LPV model of an aeroelastic system.And then,the unstable aeroelastic dynamics beyond critical airspeed are‘predicted’by extrapolating the resulting LPV model.Secondly,based on the control-oriented LPV model,an AFS controller in LPV framework which is composed of a nominal LPV controller and an LPV anti-windup compensator is designed to suppress the aeroelastic vibration and overcome the performance degradation caused by actuator saturation.Although the nominal LPV controller may have superior performance in linear simulation in which the saturation effect is ignored,the results of the numerical simulations show that the nominal LPV controller fails to suppress the Body Freedom Flutter(BFF)when encountering the actuator saturation.However,the LPV anti-windup compensator not only enhances the nominal controller’s performance but also helps the nominal controller to stabilize the unstable aeroelastic system whenencountering serious actuator saturation.

关 键 词：Anti-windup compensation Flutter suppression Linear parameter-varying interpolation Model order reduction SATURATION 

分 类 号：V215.34[航空宇航科学与技术—航空宇航推进理论与工程]