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Robust and optimal control of shimmy vibration in aircraft nose landing gear

机译：稳定可靠地控制飞机机头起落架中的摆振

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摘要

Shimmy vibration of aircraft nose landing gear is damped and controlled using a nonlinear control which is optimal and robust against parametric uncertainties and external disturbances. Shimmy vibration is the lateral and torsional vibrations in the wheel of the aircraft that is self-excited and causes instability in high speed performances which can damage the landing gear of the aircraft, its fuselage and even may result in hurting the passengers. Thus, control and damping of this vibration are extremely important. In this paper a robust optimal controller is designed by integrating sliding mode control (SMC) together with State-Dependent Riccati Equation (SDRE) to prevent the shimmy vibrations in aircraft nose landing gear. The SDRE compensator controls the nonlinear system in an optimal way while the sliding mode controller guarantees its stability against uncertainties and disturbances. The proposed controller can effectively suppress the shimmy vibration of the landing gear with variable taxiing velocity and wheel caster length. To verify the optimal performance and robustness of the proposed controller, vibration response of the system is simulated by MATLAB software and its performance and efficiency are verified using comparative analysis. Considerable improvement can be seen in the performance of the closed loop system since not only the vibrations are effectively damped but also the consumption of energy is minimized. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：飞机前起落架的振颤通过一个非线性控制得到衰减和控制，该非线性控制对于参数不确定性和外部干扰而言是最佳且鲁棒的。振颤是飞机车轮中的自激振动的横向和扭转振动，会导致高速性能不稳定，从而损坏飞机的起落架，其机身，甚至可能伤及乘客。因此，控制和衰减这种振动非常重要。在本文中，通过将滑模控制（SMC）与状态相关的Riccati方程（SDRE）集成在一起，设计了一种鲁棒的最优控制器，以防止飞机机头起落架产生剧烈振动。 SDRE补偿器以最佳方式控制非线性系统，而滑模控制器则确保其不受不确定性和干扰的影响。所提出的控制器可以有效地抑制起落架的摆振，其滑行速度和轮脚轮长度均可变。为了验证所提出控制器的最佳性能和鲁棒性，使用MATLAB软件对系统的振动响应进行了仿真，并通过比较分析验证了其性能和效率。在闭环系统的性能上可以看到相当大的改进，因为不仅可以有效地抑制振动，而且可以将能量消耗降至最低。 （C）2015 Elsevier Masson SAS。版权所有。

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