基于近似动态规划的飞机刹车自适应最优控制

Adaptive Optimal Control of Aircraft Brake System Based on Approximate Dynamic Programming

考虑到飞机防滑刹车系统中传统"PD+PBM"控制方法的低速打滑、湿跑道及混合跑道适应性差的问题,以及现有智能控制方法仅以满足控制目标的片面性,提出了一种基于近似动态规划的自适应最优控制方法,在满足控制目标的同时,使刹车性能指标也达到最优。通过仿真分析及试验验证表明,上述方法能够很好的实现机轮速度平滑减速,良好跟踪飞机速度。同时还能确保系统滑移率维持在最大结合系数对应的最佳滑移率附近,从而最大限度的利用地面结合力,提高刹车效率。不仅避免了传统控制方法的缺陷,同时也继承了滑移率控制的优点,从系统集成层面提升了刹车性能,为今后飞机刹车控制领域的发展奠定了良好的基础。

Considering the aircraft anti - skid braking system ＂ PD ＋ PBM＂ in the traditional control method of low speed skidding, wet runway and runway mixed poor adaptability, as well as the existing intelligent control method is only to meet the one sidedness of control objectives, an adaptive approximate dynamic programming method based on optimal control is proposed. It can not only meet the control target, but also make the performance indicators of the brake system up to the best. The results of simulations and tests show that the proposed method can reduce the speed of the wheel smoothly and track the speed of the aircraft well. At the same time, it can also ensure that the slip rate of the system is maintained near the optimal slip rate corresponding to the maximum binding coefficient, so as to maximize the use of ground bonding force and improve the braking efficiency. It not only avoids the defects of traditional control methods, but also inherits the advantages of slip rate control, improves braking performance of the integrated system, and lays a good foundation for the development of aircraft brake control system in the future.