Research On Snow Walking Ability And Track Shoe Design Of LF1352 Forest Carrier Vehicle

As the largest natural forest area in China,the Northeast forest area is very rich in timber resources.The temperature difference in the northeast region is large throughout the year,and winter accounts for about one-third of the year,with heavy snowfall and deep snow in winter,which makes it difficult for vehicles to pass.The crawler running system has the advantages of small grounding ratio pressure and good passability compared with the wheeled running system,so the snow running ability of the crawler vehicle has an important impact on the forest area winter operation.To this end,this paper investigates the snow running capability of LF1352 forest carrier,and uses theoretical analysis,multi-body dynamics and finite element software to study the passing capability of the tracked vehicle under different working conditions in the snow.The smoothness of the tracked vehicle’s cross-slope and longitudinal slope driving and the ability to cross obstacles were theoretically analyzed,and the snow thrust model of a single tracked shoe was established to analyze the hook traction of the tracked vehicle.The multi-body dynamics software is used to model the tracked vehicle,and multi-body dynamics simulation is conducted for its walking ability in snow conditions such as emergency acceleration and braking,slope,longitudinal slope,barrier crossing and steering,etc.The snow steering conditions of the tracked vehicle with three different turning radii are analyzed,and it can be seen that the fluctuation of the angular acceleration of the center of mass rotation during forward and reverse steering in place is greater than that of the center of mass rotation during one-sided braking steering and small radius steering.The angular acceleration of rotation is greater than that of unilateral braking steering and small radius steering,and the vertical load on the load bearing wheels under different snow conditions should be avoided during actual driving.The effect of the main structural parameters of the track shoe on the snow thrust was investigated by BBD test method,in which the track shoe pitch and track grouser height were the significant factors affecting the track shoe snow thrust.In order to reduce the structural mass of the track shoe,the track shoe pitch and track grouser height were used as design variables to optimize the track shoe track grouser height and track shoe pitch.The finite element simulation was carried out for the track shoe under snow conditions such as emergency acceleration and braking,slope driving,vertical slope driving,overrunning and steering,etc.The stress and displacement clouds of the track shoe under different snow conditions were obtained,and the results showed that the track shoe was subjected to the maximum stress when crossing the vertical wall.The maximum stress on the track shoe meets the requirement of safety factor and is reliable.In summary,this paper analyzes the passing ability of LF1352 forest carrier in different working conditions in snow by multi-body dynamics software,combines bionics and computer simulation technology,bionically designs the track shoe with better passing ability,analyzes the motion process of track shoe in snow,investigates the structural parameters that affect the thrust of track shoe in snow,and analyzes the stress and displacement cloud diagram of track shoe under different working conditions.The research results are of great significance for enhancing the driving passability of tracked vehicles in snow and promoting the modernization of winter operations in forest areas.