液压缓冲无杆牵引车刹车工况下的仿真研究

在飞机地面牵引移动的过程中,无杆式飞机牵引车因遭遇突发事件等因素造成单独刹车时,通常会产生过大的牵引载荷,又因常规无杆式飞机牵引车与飞机连接所组成的牵引系统在纵向上只有飞机前起轮胎是柔性体,不能够起到良好的缓冲作用。因此,提出一种具有抗冲击的动刚度液压缓冲无杆式飞机牵引车方案,以A320-200为例,基于Adams建立“无杆牵引车(车架-缓冲器-夹持举升机构)-飞机”多体系统模型,牵引车单独制动进行仿真,对常规无杆式飞机牵引车和液压缓冲无杆牵引车在最大刹车力及相同刹车距离下的牵引载荷变化情况对比。结果表明,在以上两种情况下,选择合适的缓冲距离,液压缓冲无杆牵引车都能够降低牵引载荷到限制的范围内。

Research on Simulation of Hydraulic Buffered Towbarless Vehicle when Braking

Huge towing loads usually will be produced by sudden brake due to various emergencies when aircraft are being towed by towbarless vehicle.In addition,the towing system only have one flexible body which is the front tires and cannot play a good buffering role.Given this,a towbarless vehicle with hydraulic buffering function of anti-impact variable stiffness is designed and a modal of towbarless vehicle(towbarless vehicle’s frame-buffer-clamping and lifting mechanism)-aircraft multi-body system is established focusing on A320-200 on Adams.At maximum braking force and same braking distance,comparing the towing loads of general towbarless vehicle and towbarless vehicle with hydraulic buffering function is simulated.It turns out that the hydraulic buffered towbarless vehicle can reduce towing loads to the limit range by selecting the appropriate buffer distance in the two cases.