考虑柔性车架的无杆飞机牵引系统平顺性研究

Study on Ride Comfort of Towbarless Aircraft Taxiing System Considering Vehicle Frame Flexibility

无杆飞机牵引车(TLTV)通过车架上抱轮机构将飞机前机轮夹紧、抱起,形成飞机牵引系统,通过牵引车提供动力将飞机牵引至指定地点。考虑无杆飞机牵引车柔性车架作用,基于牛顿第二定理和梁的弯曲变形理论推导无杆飞机牵引刚柔耦合系统振动微分方程,对比分析低速与高速牵引作业时,随机、脉冲机场路面激励输入工况下牵引车座椅平面、牵引车质心、飞机机体等关键测点的平顺性,研究飞机牵引系统准静态和动态力学模型的时域振动特性差异。进一步研究高速牵引作业时,飞机质量、车架柔性、牵引车质心及座椅位置对飞机牵引系统平顺性的影响规律,结果表明适当改变牵引系统关键参数可提高飞机牵引系统的平顺性。

The civil aircraft nosewheel is clamped and lifted through the pick-up and holding system of the towbarless towing vehicles(TLTV), and the aircraft is towed to the destination such as the take-off position on the runway or the maintenance hangar only driven by the TLTV. Based on Newton’s second law and the bending formula of beam, the vibration differential equation of the rigid-flexible coupled TLATS is derived by considering the flexibility of the TLTV frame. The ride comfort of key measurement points such as the TLTV seat, centre of gravity(CG) of the TLTV, and the airframe under both random and bump airport road excitations during low-speed and high-speed towing operation are comparatively analysed. The differences of the timedomain vibration characteristics between the quasi-static and dynamic TLATS models are discussed.The effects of aircraft sprung mass, TLTV frame flexibility, TLTV CG and driver seat positions on the ride comfort of the rigid-flexible coupled TLATS during high-speed towing operation are further investigated. The results show that properly changing some key parameters of the TLTV could improve the TLATS ride comfort.