支柱式前起落架系统刚度与摆振稳定性研究

系统刚度（航向、侧向和扭转刚度）是支柱式前起落架设计的重要指标，探明系统刚度对摆振稳定性的影响规律，对起落架的防摆设计具有重要意义。采用改变缓冲器初始气体压力的方式，分析缓冲器行程对系统刚度的影响规律，研究系统刚度对支柱式前起落架摆振的初始扭转角、收敛时间、收敛比例和稳定区域的影响。结果表明：增大支柱式前起落架系统刚度，可提升防摆性能，但同时会造成初始扭转角和摆振收敛时间的增加，这会降低起落架抵御外界干扰的能力，因此，不能过度增加支柱式前起落架系统刚度。

Study on stiffness and shimmy stability of strut-type nose landing gear system

System stiffness (longitudinal, lateral, and torsional stiffness) is a meaningful index for strut nose landing gear design. It arises from profound significance to explore the influence law of system stiffness on shimmy stability for the anti-shimmy design of landing gear. By changing the initial gas pressure of the buffer, the influence of buffer stroke on the system stiffness is analyzed, and the influence of the system stiffness on the initial torsion angle, convergence time, convergence ratio, and stability area of the strut nose landing gear shimmy is studied. Results show that increasing the stiffness of the strut-type nose gear system can improve the anti-shimmy performance, but increase the initial torsional angle and shimmy convergence time, and reduce the ability of the landing gear to resist external disturbances. Therefore, the stiffness of the strut-type nose landing gear system cannot be excessively increased, which provides a guiding significance for its anti-shimmy design.