A Swi Theory And Numerical Research On Tractive Performance Of Military Vehicle Under Multi-operation Conditions

Military vehicles play a significant role in modern warfare,which highly depends on tractive performance under multiple operating conditions.As the development of combat modes in PLA,the tractive performance of military vehicles driving on sands also demands increasing concentration.To futher improve the reliability and applicability of the theoretical predicting model,a SWI(Sand-Wheel Interaction)theory on tractive performance of military vehicles under multi-operation conditions is researched in this paper.Following are the major contents:1)A SWI theory on tractive performance of military vehicles under multi-operation conditions is proposed.Considering that the exsisting theories on tractive performance lack the variety of operating conditions and the precision in predicting large lug effects,this paper combines theories of equivalent radius and Rankine’s passive soil pressure in terms of lugs’ slipping motion.Therefore,a SWI theory on tractive performance of military vehicles under multi-operation conditions is proposed on the basis of the improved lug effects predicting method,contributing to the prediction and analysis on the tractive performance of military vehicles under complex conditions.2)Numerical modeling and simulating for the tractive performance of military vehicles under multi-operation conditions is conducted.Considering that the previous numerical research mainly focus on the light,small-size vehicles under straight driving condition,this paper simulated a numerical model for the tractive performance of military vehicles under multi-operation conditions by the discrete element method(DEM).The model is primarily validated by triaxial shearing test and and exsisting tracting data,which provides a reliable reference for the validation of the theoretical model proposed in this paper.3)Validation of the SWI theory on tractive performance of military vehicles under multi-operation conditions is conducted.Finally,the theoretical and numerical analysis are separately conducted for tractive characteristics,in terms of the wheel’s radius,width and vertical load,the lugs’ height,number and type,along with the different inclining and turning driving conditions.The validation results indicate that the improved theoretical model in this paper could precisely predicts the values and tendencies of tractive performance.Consequently,the improved theoretical proposed in this paper is proved reliable and applicable,satisfying the future demands of the tractive prediction of special military vehicles.