摆振对飞机地面滑行的操纵性与安全性等影响较恶劣,大幅度地缩减起落架的使用寿命,从而增加事故发生率.为了抑制前起落架发生摆振,本文采用非线性能量汇(Nonlinear Energy Sink,NES)对前起落架进行减摆.以某轻型飞机起落架为研究对象,建立了含有NES装置的单轮前起落架摆振动力学模型.首先,分析了NES装置对起落架摆振稳定性区域和发生摆振时振幅的影响,证明了NES装置对减摆的有效性.其次,分析了NES装置非线性刚度、线性刚度、质量、阻尼系数和NES装置到前起落架S轴的垂直距离对减摆效果的影响.再次,在给定的优化目标下,选择合适的参数优化范围,通过遗传算法对参数进行全局优化设计.最后,通过时域分析验证了优化结果的可靠性.研究表明,NES装置能够提高前起落架的防摆性能,具有很好的实际应用价值.
Nose Landing Gear Stability Enhancement and Shimmy Suppression with a Nonlinear Energy Sink
Aircraft ground handling is significantly impacted by shimmy,which reduces landing gear lifespan and increases accident rates.This study employs a nonlinear energy sink(NES)to mitigate land-ing gear shimmy.Focusing on the landing gear of a light aircraft,a dynamic model incorporating an NES device is developed.First,the NES device's impact on the stability region and amplitude of landing gear shimmy is analyzed,demonstrating its effectiveness in mitigating shimmy.Beside,the study examines how parameters such as nonlinear stiffness,linear stiffness,mass,damping coefficient,and vertical distance from the NES device to the landing gear's S-axis influence damping.Furthermore,under specified optimi-zation goals,suitable parameter ranges are selected and a genetic algorithm is employed for global optimi-zation.Finally,the reliability of the optimized results is confirmed through time-domain analysis.This re-search indicates that NES devices can enhance landing gear anti-shimmy performance,offering significant practical value.
landing gearshimmynonlinear energy sinkoptimized design
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