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A robust active control system for shimmy damping in the presence of free play and uncertainties

机译:强大的主动控制系统,可在无间隙和不确定性的情况下实现匀称阻尼

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摘要

Shimmy vibration is the oscillatory motion of the fork-wheel assembly about the steering axis. It represents one of the major problem of aircraft landing gear because it can lead to excessive wear, discomfort as well as safety concerns. Based on the nonlinear model of the mechanics of a single wheel nose landing gear (NLG), electromechanical actuator and tire elasticity, a robust active controller capable of damping shimmy vibration is designed and investigated in this study. A novel Decline Population Swarm Optimization (P_DSO) procedure is introduced and used to select the optimal parameters for the controller. The P_DSO procedure is based on a decline demographic model and shows high global search capability with reduced computational costs. The open and closed loop system behavior is analyzed under different case studies of aeronautical interest and the effects of torsional free play on the nose landing gear response are also studied. Plant parameters probabilistic uncertainties are then taken into account to assess the active controller robustness using a stochastic approach.
机译:振颤是叉轮组件绕转向轴的振荡运动。它代表了飞机起落架的主要问题之一,因为它可能导致过度磨损,不适以及安全问题。基于单轮前起落架(NLG),机电执行器和轮胎弹性的非线性模型,设计并研究了一种能够阻尼摆振的鲁棒主动控制器。介绍了一种新颖的下降种群群优化(P_DSO)程序,该程序用于为控制器选择最佳参数。 P_DSO过程基于递减人口统计模型,并显示出较高的全局搜索功能,同时降低了计算成本。在不同的航空研究案例下分析了开环和闭环系统的行为,并研究了扭转自由游隙对前起落架响应的影响。然后,使用随机方法考虑工厂参数的概率不确定性,以评估主动控制器的鲁棒性。

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