飞机主起落架机轮摆振分析

WHEEL SHIMMY ANALYSIS FOR MAIN LANDING GEAR OF AIRCRAFT

针对××型飞机主起落架上、下扭力臂之间装有附加阻尼器的特殊方案,分析了主起落架机轮摆振问题,讨论了各种参数的变化对防止摆振的作用,结果表明附加阻尼器对防止摆振的必要性和有效性。同时,又对该型飞机采用4轮小车式主起落架的改型方案,验证了去掉原来附加阻尼器的合理性。

Applying the general linear theory of shimmy, this paper analyzes the main wheel shimmy problem of a special type of the main landing gear equipped with an additional shimmy damper between the upper part and lower part of torque arms. The influence of various structural and operational parameters on shimmy is discussed, and the results show that the additional damper is necessary and effective for preventing shimmy. Meanwhile, a new version of this type of airceraft with four wheel bogie main landing gear is also investigated. It is concluded that in this case the additional damper can be omitted, since this landing gear itself is inherently stable as for shimmy. This approach aims to explain the practical advice adopted in an existing design. The results may also be referred for other aircraft design.