飞机起落架摆振的阻尼特性影响

采用考虑支柱弹性、减摆器传动系统弹性、轮胎变形、结构重量、垂直载荷以及机轮陀螺力矩等影响因素的线性机轮摆振分析模型,通过灵敏度分析方法,区别研究了"轮胎型"摆振和"结构型"摆振.首先计算稳定矩、支柱侧倾刚度和减摆传动系统扭转刚度等结构参数的改变对减摆器阻尼的影响,以获得速度-灵敏度曲线,然后利用一组速度-灵敏度曲线分析阻尼特性对摆振稳定区域的影响,灵敏度计算考虑了各参数之间的耦合效应.算例表明方法合理、有效,同时为起落架防摆振设计的研究提供了一条新的途径.

Influence of damping characteristics to landing gear shimmy

A linear shimmy analysis model was used,which includes the elasticity of strut,the elasticity of damper linkage system,tire deflection, structure weight,vertical loads and wheel gyroscopic couple.With the method of sensitivity analysis,research on tire-yaw shimmy and structural-torsion shimmy was made separately.The three key landing gear structural parameters including trail,bending stiffness and torsional stiffness of damper linkage on aircraft wheel shimmy were investigated thoroughly.The investigation took the coupling effects among different parameters into consideration and calculated the sensitivity of damping to parameters' variety,and the effects of damping characteristics to shimmy was attained.The results supply a new idea for the design of aircraft and for the safe maintenance of operational ones to prevent the occurrence of shimmy.