轮胎刚度特性对大型民机前起落架摆振影响研究

Influence of Tire stiffness characteristics on shimmy of large civil aircraft nose landing gear

摘要:

轮胎刚度作为轮胎动力学模型的重要参数之一，研究其对大型民机前起落架摆振的影响规律，可以从前起落架防摆设计的角度为轮胎刚度设计提供参考依据。基于前起落架摆振非线性数学模型，使用Matlab/Matcont 软件计算不同轮胎扭转刚度、轮胎侧弯刚度下的摆振区域图；研究轮胎扭转刚度、轮胎侧弯刚度对前起落架摆振的影响规律，并对比二者对前起落架摆振影响的敏感度。结果表明：对前起落架摆振影响的敏感性，轮胎扭转刚度大于轮胎侧弯刚度；轮胎回正力矩系数每减小1%，扭转摆振最大临界阻尼减小0.88%，侧向摆振中速区最小临界减摆阻尼增大33.87%；减小轮胎扭转刚度，增大轮胎侧弯刚度有利于抑制大型民机前起落架摆振。

Abstract:

Tire stiffness is one of the important parameters of tire dynamics model. The influence of tire stiffness on the shimmy of large civil aircraft nose landing gear can provide reference for the anti-shimmy design of large civil aircraft nose landing gear from the perspective of tire design. The nonlinear mathematical model of the front landing gear shimmy was established, and the shimmy region diagram of different tire torsional stiffness and tire side bending stiffness was calculated by using Matlab/Matcont software. The influence law of tire torsional stiffness and tire side bending stiffness on the shimmy of the front landing gear was studied, and the sensitivity of the two on the shimmy of the front landing gear was compared. The results show that the sensitivity of tire torsional stiffness to the impact of nose landing gear shimmy is greater than that of tire lateral bending stiffness. When the positive torque coefficient decreases by 1%, the maximum critical damping of torsional shimmy decreases by 0.88%, and the minimum critical damping of lateral shimmy increases by 33.87%. Reducing the torsional stiffness of tire and increasing the lateral stiffness of tire are beneficial to restrain the yaw of large civil aircraft nose landing gear.