| Hypersonic vehicle is describing a kind of aircraft which flies in theatmosphere5to10times the velocity of sound. Its propelling principles and controlmode relies on aerodynamics. Now it is a globally heated study. Hypersonic vehicleis quite different from conventional aircraft in the aspect of aerodynamiccharacteristics, so that common control theory can not control it effectively andreliably.Basing on reasonable assumption and simplification, this article establishes themodel of rigid body in hypersonic vehicle, derivates the state function of the system,and obtains the expression of system parameters. In the state function, the differentstates have a serious coupling. Additionally by analyzing the zero point, the systemcharacteristics of hypersonic vehicle is quite different from conventional aircraft. Asa result, the controllability is not so good.Active disturbance rejection control has already been widely applied inindustrial applications of different engineering fields. This article elaborates classicactive disturbance rejection control, and analysis the function and capability of eachmodule. With the analysis, this article improves partial nonlinear function andadjusts the curve smooth and continuous. Applying the improved nonlinear function,active disturbance rejection controller can be improved as well.While a hypersonic vehicle is flying in cruise segment, it is necessary tocontrol its attitude effectively. This article designs improvedactive disturbance rejection attitude controller. Specific for angle of attack problem,second order improved active disturbance rejection controller is designed. Aftercomputing and debugging, all the specific parameters applying in the improvedactive disturbance rejection controller are obtained.Tracking control and attitude control of hypersonic vehicle are also importantissues. This article designs improved active disturbance rejection tracking controller.The controller treats internal coupling as active disturbance and decouples in dualinput and dual output system. To cruising speed and tracking control problem, animproved first order active disturbance rejection controller is designed. The innerloop and outer loop both use improved second order active disturbancerejection controller. After computing and debugging, all the specific parametersapplying in the three whole improved active disturbance rejection controllers whichare used in two channels are respectively obtained.After computer simulation verification, the control performance of improved active disturbance rejection controller is better than that of classic active disturbancerejection controller. All the designed hypersonic vehicle controllers in this article areproved to have a better effect than previous expectation. |
