Design and simulation of BTT nonlinear controller for hypersonic vehicle
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摘要: 高超声速飞行器的气动特性比一般的飞行器更为复杂,选用BTT(Bank-to-Turn)技术,即倾斜转弯技术可以满足其对于气动外形的要求,但随之给动力学系统带来了快时变、严重非线性及强烈耦合的特点.针对高超声速飞行器倾斜转弯非线性控制器的这一特点,采用了一种更为有效的非线性系统的控制方法,即非线性动态逆技术.首先建立了高超声速飞行器的非线性数学模型,然后根据奇异摄动理论将动力学系统的受控状态变量分为快变量和慢变量2部分,应用非线性动态逆理论分别对快逆回路和慢逆回路进行设计,其中慢逆回路控制器的输出作为快逆回路控制器的输入指令,最后对于所设计的系统在高超声速下的倾斜转弯运动进行了仿真验证.仿真结果表明该控制系统可以实现倾斜转弯,并可以满足高超声速飞行器稳定飞行的要求.Abstract: Aerodynamics effects of hypersonic vehicle are complex than that of common vehicle. Bank-to-turn(BTT) technique can satisfy the demands of hypersonic vehicle for aerodynamics shape, with which brings dynamics system the character of fast time-varying, strong coupling and high nonlinear. Against the character of the hypersonic vehicle bank-to-turn nonlinear controller, a more effective control method for nonlinear system was applied, which was nonlinear dynamic inversion technique. A nonlinear model was built. Then the dynamics controlled were separated into fast and slow variables in terms of singular perturbation theory. Two dynamic inversion control laws were designed for the fast and slow inversion loop. The outputs of outer loops were used as the inputs of inner loops. The above designed control laws were used to simulate according to the given bank-to-turn command in hypersonic flight conditions. The simulation results show that the control system can achieve bank-to-turn motion and guarantee the stability of the hypersonic vehicle.
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Key words:
- nonlinear dynamic inversion /
- bank-to-turn /
- flight control systems /
- hypersonic
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