近空間可變翼飛行器多模態(tài)切換控制研究
[Abstract]:The near space vehicle (Near Space Vehicle,NSV) works in the near space area of 20~100km. It has the advantages of high efficiency cost ratio, long lag time, high resolution and strong maneuverability. Therefore, the research work of near space vehicle has been attached great importance to by the military powers all over the world. Near-space variable wing aircraft (Near Space Morphing Vehicle,NMV) not only has the characteristics of strong nonlinearity, intense and fast time-varying, strong coupling and serious uncertainty, but also has the problem of small wing expansion and expansion. Therefore, it is very challenging to study the modal control and modal switching control of the near space variable wing aircraft. In this paper, the nonlinear model establishment, flight control under different flight modes and wings, and switching control for different flight modes and wing expansion changes are studied in this paper. The specific research contents are as follows: firstly, according to the data of the model of the near space vehicle published at home and abroad, the nonlinear model of the near space variable wing with the telescopic wing is established according to the characteristics of the variable wing. Because of the complex and changeable characteristics of the flight environment and the differences of different modes of flight missions, the atmospheric environment model and the engine thrust model of different modes are established, and the open-loop characteristics of the aircraft are analyzed. It lays a solid foundation for the research of flight control and switching control of aircraft. Secondly, because of the large flight envelope, the characteristics and control requirements of different flight modes are different. Therefore, based on the mission difference and the small wing state, the modal of the near space variable wing aircraft is divided, and the influence of each modal constraint condition and the small wing state on the aerodynamic force and torque is analyzed. Considering the advantages of sliding mode control (SMC) in dealing with uncertain problems and the disadvantages of buffeting, a double power approach law sliding mode control method is proposed for the equivalent model of feedback linearization, and flight controllers for climbing and cruising modes are designed. In this paper, the stability of the sliding mode control method is proved theoretically, and then the effectiveness and robustness of the method for different flight modes are proved by simulation. Then, considering the sudden change of flight state during mode switching, it is easy to cause instability of the aircraft. Therefore, in view of the switching process of climbing / cruising mode of the near space variable wing aircraft, the control effect of direct switching is analyzed, and the necessity of designing switching control law is explained. Considering the robustness of the sliding mode control method, a sliding mode switching control algorithm based on the inertial link is proposed. The advantages and disadvantages of this method and the traditional inertial link switching control method are analyzed by numerical simulation. Finally, in view of the particularity of the research object, the influence of different states on flight control is analyzed, and the control system under different wing states is studied. Because the aerodynamic parameters change due to the change of the wing state, the double power approach law sliding mode switching control algorithm based on the inertia link is applied to the transfer process of the wing retraction / extension. Numerical simulation shows that the method has good control effect and good robustness. To sum up, a new switching control algorithm is proposed in this paper, which focuses on the flight control, flight mode switching and flanking switching of the near-space variable wing aircraft. The mode switching process is stable and smooth.
【學(xué)位授予單位】:南京航空航天大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:V249.1
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