Research On Robust Adaptive Control Method Applied To Spinning Guided Projectile

Modern warfare environment put forward higher requirements on the perfor-mance of the guided projectile, which need to have more qualification to high-maneuver and battle sky, so the projectile was a strong coupling of the nonlinear time-varying systems。This paper based on the nonlinear dynamic model of guided projectile with uncertainties, studied two kinds of nonlinear robust adaptive design method.The six degrees of freedom flight mechanics model is established, The dynamic characteristics of artillery projectile is analyzed。Then the PID and the expert PID is designed for overload autopilot of guided projectile, the simulation results show that the response speed of overload autopilot which based on expert PID is more faster robustness and adaptability。The nonlinear control which based on backstepping was design for spin-guided projectile, the simulation is made by matlab/simulink。theoretical analysis and simulation results show that the algorithm can handle nonlinear characteristics of the system, simulation results show that the algorithm can handle nonlinear characteristics and enhance the robustness of the system。But there are also some deficiencies of the algorithm, in order to further improve performance,, a first-order low-pass filter is add to solve the "number of expansion", in order to enhance the robustness of the system, adaptive laws were designed to estimate unknown para-meters of the model。Simulation results show that the control system has a better tracking performance under the conditions of aerodynamic parameters uncertainties and external disturbances。Traditional adaptive law only can make sure the parameter estimation error is bounded and tend to be an unknown constants。because the closed-loop control system may cause an undesired transient response, the paper introduces a new adaptive algorithm (I&I) parameter estimation algorithm to improve the performance of this algorithm which does not invoke certainty equivalence, and does not require the knowledge of a (control) Lyapunov function, last the effective of the estimated effect of guided projectile aerodynamic parameters is improvement。The nonlinear overload model of spin-guided artillery shells which whole state can be measured is made, the paper propose a design method of adaptive robust controller which designed for guided artillery shells, in the effective use of the existing condition information, the system relaxed uncertain of the requirements, the simulation results show that this method can effectively overcome outside interference and the performance is better。...