Research On Travel System Of All Terrain Articulated Tracked Vehicle

All terrain articulated tracked vehicle is characterized by high and good mobility, itcan travel in a variety of extreme conditions, such as snow, streams, ponds, swamps,jungles, deserts, mountains and successfully complete rescue and transportation. Comparedto wheeled vehicles, its greatest strength is the large ground area, low ground pressure,high climbing ability. Because the vehicle has these advantages, It can be widely used inthe military, construction, agriculture and forest fire areas.Travel system is the key system of all terrain articulated tracked vehicle as well as thesystem whose force is most complex and largest, it can not only bear with whole vehicleweight, but also reduce ground impact to the vehicles when it is traveling. It has high faultrate, its weight about accounts for20%of whole vehicle weight, maintenance costs oftravel system can accounts for50%maintenance costs of all terrain articulated trackedvehicle. Research on travel system of all terrain articulated tracked vehicle has animportant theoretical and practical significance.This article describes the sources and background of travel system of all terrainarticulated tracked vehicle and summarizes and introduces the development of all terrainarticulated tracked vehicle at home and abroad. It illustrates the theoretical significanceand practical significance of research on travel system of all terrain articulated trackedvehicle. Using software Proe draws three dimensional model of travel system of all terrainarticulated tracked vehicle and introduces its composition details. Through establishedmathematical model of steering and pitching of all terrain articulated tracked vehicle toanalyse its steering and pitching and deduced the calculations of steering resistancemoment when Steering on the clay as well as the calculations of carrying capability oftravel system when pitching and finally got the Steering resistance moment and the forceof travel system wheel when pitching.Using reliability and durability of travel system hanging elastic element of all terrainarticulated tracked vehicle as a design goal, determined the working diameter transitionsections and end structure of torsion bar spring. From theoretical verification it isconcluded that there is a linear relationship among wheel travel, force and suspensionstiffness, the design of suspension systems can meet the requirements of cushioning and smooth performance.Through using virtual prototype technology and based on the multi-body systemdynamics theory, from the simulation results of simulation software recurdyn, it is knownthat the travel system can not only make vehicle successfully steering, stepping overcontinuous embossment and trenches, pitching, climbing vertical wall and so on, but alsomeet the using requirements of all terrain articulated tracked vehicle. Form the simulationresults of all terrain articulated tracked vehicle steering on rock, dry soil, sandy loam andheavy clay pavement it concluded that the needed oil cylinder force value of articulatedinstitutions steering telescopic oil cylinder is increasing when all terrain articulated trackedvehicle steering on rock, sandy loam heavy clay and dry soil. It is most difficulty for allterrain articulated tracked vehicle to steer on dry sand. The weight of the vehicle is uniformdistribution on each wheel of the travel system of all terrain articulated tracked vehiclewhen normally driving on flat roads, the impact load of wheel1of the front and rearvehicle are maximum when all terrain articulated tracked vehicle is stepping overcontinuous embossment, trenches, and climbing vertical wall. The maximum value canreach to5times than uniform load of the wheel when all terrain articulated tracked vehicleis running normally.Through the comparative analysis of all terrain articulated tracked vehicle and singlevehicle stepping over trench in the same pavement condition, the fore condition of thetravel system of all terrain articulated tracked vehicle is better than the fore condition ofthe travel system of single vehicle, the comfort of vehicle has been greatly improved. Froma long-term point of view, the travel system of all terrain articulated tracked vehicle can beused for a long time. Through the simulation of all terrain articulated tracked vehicleclimbing35°road respectively on the rock, dry sand and heavy clay, it is concluded thatwhen all terrain articulated tracked vehicle is climbing in uniform speed, the outputmaximum torque of rear drive wheel is greater than the maximum output torque of frontdrive wheels, and it is the most difficult when it climbing on the clay.