飞机地面滑行随机振动分析

 采用功率谱方法,讨论了飞机4自由度简化模型的地面滑行动态响应问题,并对前、主起落架油-气式缓冲系统的非线性特性进行线化处理,推导了解决此问题的解析方法,算例的计算结果与文献相符很好。

ANALYSIS OF STATISTICAL VIBRATION IN AIRCRAFT DURING TAXIING

Serious vibrational problems may arise in aircraft taxiing.In the previous work by the authors, the use of a two-degree-of-freedom model has successfully yielded a simple analytical expression for the verticai acceleration at the e.g. and for the dynamic response of the main landing gear. However, both the pitch of the aircraft and the heave of the nose landing gear must by taken in to account, when the dynamic response of any point far from the c.g.such as the cockpit, the nose landing gear, etc, is to be discussed,In this paper, the PSD method is introduced in the statistical analysis of the dynamic response of aircraft during taxiing due to the runway unevenncss, in which the oleo-pneumatic shock absorbers of the nose and main landing gears are linearized with the equivalent linearization technique.A4 DOF system is solved numerically to calculate the heave and pitch responses of the aircraft. The analytical models proposed in the paper are computer-programmed, and the computations for some aircraft indicate that the results of dynamic response in aircraft during taxiing are in good agreement with the ones of the Reference in which the determinant method is used.