Adaptive Attitude Control for Hypersonic Vehicle Based on Sigmoid Function
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Beijing Aerospace Automatic Control Institute,,,
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摘要:
針對高超聲速飛行器無(wú)動(dòng)力再入過(guò)程中具有強耦合、氣動(dòng)參數攝動(dòng)及不確定性的非線(xiàn)性姿態(tài)模型,提出了飛行器姿態(tài)控制的一種非線(xiàn)性設計方法。首先基于時(shí)標分離原理分內外環(huán)設計非線(xiàn)性動(dòng)態(tài)逆控制器,并利用Sigmoid函數分通道制定控制律。針對單純使用動(dòng)態(tài)逆控制魯棒性弱的特點(diǎn),引入基于擴張狀態(tài)觀(guān)測器(Extended State Observer,ESO)的自適應控制器對參數攝動(dòng)和不確定性進(jìn)行補償,在參數拉偏和風(fēng)干擾條件下仿真結果驗證了設計控制器具有較強的魯棒性。
Abstract:
For the hypersonic vehicle nonlinear attitude mode in reentry process unpowered with a strong coupling, aerodynamic parameter perturbations and non-deterministic, a nonlinear attitude control method is put forward. Firstly, the nonlinear dynamic inversion controller is purposed by inner and outer ring according to time-scale separation principle, and using the Sigmoid function to formulate expected input. In the light of weak robustness characteristic by simply using dynamic inverse control, the adaptive controller is proposed based on ESO to compensate parameter perturbation and uncertainty. The simulation under parameter pull off and wind disturbance conditions effective verify the control system’s strong robustness.