Abstract: Taking one C type aircraft as research target, the model of aircraft-towbarless tractor is established based on SolidWorks and Adams in order to study the load margin of towbarless wheel holding device Two kinds of uneven road models are summarized basing on theretical analysis. Dynamic simulation is carried out on the process of a towed tractor with a traction speed (5 km/h) based on dynamic theory analysis. The load of nose landing gear pillar is measured on uneven road; the maximum peak load is taken as load margin of the wheel lifting device. Simulation results show that the load of nose landing gear pillar increases with the depth enlargement of the pit or bulge, and the load curve firstly increases and then decreases with the width increase of the pit or bulge,then slowly increases, the load curve slowly changes with the width increase.

Key words: color:#000000, font-family:", sans serif", ,tahoma,verdana,helvetica, font-size:12px, font-style:normal, font-weight:400, line-height:18px, text-decoration:none, ">towbarless vehicle, uneven road, dynamics simulation, nose landing gearcolor:#000000, font-family:", sans serif", ,tahoma,verdana,helvetica, font-size:12px, font-style:normal, font-weight:400, line-height:18px, text-decoration:none, ">