舰载机变长度减振牵制装置动力学分析

Analysis on Anti-Vibration Holdback Device of Carrier-Based Aircraft

舰载机弹射起飞过程中,由于牵制载荷突卸而产生的前起落架沿航向的快速振动对机体结构和设备都会带来严重的疲劳问题。本文建立了舰载机弹射起飞动力学模型,设计了具有减振功能的舰载机弹射起飞变长度牵制装置,分析了该装置的动力学特性,并对该装置的减振效果进行了参数分析。研究结果表明:牵制载荷沿下扭力臂轴向的载荷分量所造成的缓冲器活塞杆的向后弯曲是导致牵制载荷突卸后前起落架振动的主要原因;变长度减振牵制装置通过实时改变牵制杆长度和牵制角,可大幅降低牵制载荷突卸后前起落架振动以及各铰接点振荡载荷,该装置在解决牵制载荷突卸振动问题中效果明显。

The vibration of the nose landing gear caused by the sudden discharge of holdback load during catapult launch of a carrier-based aircraft could bring serious fatigue problem to the structure and airborne equipment. With the purpose to solve the vibration problem, a dynamics model of catapult launch is established. An anti-vibration holdback device is designed while the dynamic characteristic and the effect of the device are discussed. From the research, the conclusions show that. the aft bending of the strut is the primarily reason of the fore-aft vibration of nose landing gear~ the anti-vibration device would reduce the vibration load at the joint of gear and fuselage sharply with changing the length of the holdbar and the hold angle. The anti-vibration hold back device is effective in solving the vibration phenomenon.