高支柱起落架走步振动与稳定性分析  

Analysis of Walking Vibration and Stability of High Strut Landing Gear

作　　者：杜晓琼 李斌[1,2] 罗琳胤[3] 刘木君 杨荣 DU Xiaoqiong;LI Bin;LUO Linyin;LIU Mujun;YANG Rong(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,Shaanxi,China;National Key Laboratory of Strength and Structural Integrity,Northwestern Polytechnical University,Xi’an 710072,Shaanxi,China;AVIC General Huanan Aircraft Industry Co.Ltd.,Zhuhai 519040,Guangdong,China)

机构地区：[1]西北工业大学航空学院,陕西西安710072 [2]西北工业大学强度与结构完整性全国重点实验室,陕西西安710072 [3]中航通飞华南飞机工业有限公司,广东珠海519040

出　　处：《兵工学报》2024年第8期2793-2805,共13页Acta Armamentarii

基　　金：国家自然科学基金项目(11872312);高等学校创新引智计划项目(BP0719007)。

摘　　要：为改善装备碳陶刹车盘的高支柱起落架走步振动问题,对走步规律进行了深入分析。阐述走步机理,碳陶刹车盘摩擦特性引起的负斜率刹车力矩会向起落架航向系统引入负阻尼,引起走步振动的发散。基于3自由度走步动力学方程,开展了刹车力矩参数、起落架结构参数以及机身初始速度对走步振动的影响研究,定义了走步振动发散的临界状态,并提出刹车压力随刹车动静盘相对转速减小的走步控制策略。仿真结果表明:刹车盘摩擦系数负斜率绝对值的减小,刹车压力的降低,支柱刚度和阻尼的增大都可增加走步系统的稳定性,刹车盘摩擦的最小值提高至0.186可确保飞机以任意速度刹车走步稳定;刹车压力下降的斜率随刹车速度的不同而改变,飞机从144 km/h开始刹车,刹车压力降低24.7%可使走步振动收敛,轮轴航向加速度峰值降低77.23%。In order to improve the gear walk instability of high strut landing gear equipped with carbon ceramic brake discs,the rule of gear walk is analyzed thoroughly.The gear walk mechanism is explained.The braking torque with negative slope caused by the friction characteristics of the carbon ceramic brake disc can introduce negative damping to the longitudinal system of the landing gear,which causes the divergence of walking vibration.The effects of the brake torque parameters,the structural parameters of landing gear and the initial velocity of aircraft on gear walk are studied.Finally,a gear walk control strategy for reducing the braking pressure with the relative angular velocity of brake stators and rotors is proposed.The result shows that the decrease in the absolute value of negative slope of brake disc friction coefficient and the braking pressure,as well as the increase in the longitudinal stiffness and damping of strut will all contribute to the stability of gear walk.The stable gear walk can be achieved at any initial velocity of aircraft by increasing the minimum friction coefficient of brake disc to 0.186.The dropping slope of braking pressure is closely related to the initial velocity of aircraft.The simulated results of aircraft braking from 144 km/h show that a 24.7%dropping in braking pressure can lead to the convergence of unstable gear walk and a 77.23%reduction in the longitudinal acceleration peak of wheel axle.

关 键 词：起落架走步 刹车振动 碳陶刹车盘 负斜率刹车力矩 

分 类 号：V214.33[航空宇航科学与技术—航空宇航推进理论与工程]