Mobility simulation modelling of wheeled military vehicles under off-road traffic conditions

Abstract

Ensuring the mobility of military vehicles (MV) is especially urgent in the conditions of modern hybrid wars and determines the growth of requirements for their designs. The influence of cross-country ability indicators, suspension and tire characteristics on limiting the maximum possible off-road speeds was analyzed. It is shown to limit the maximum speeds depending on the maximum permissible values of the vibrational loads level on the human body, disturbed by irregularities, the off-road micro-profile and the corresponding transmission functions of the suspension and tires. An analysis of literary sources, as well as standards regarding the methods of evaluating the movement mobility, determining the limit vibrational loads from the point of view of limiting the maximum speed of movement of the MV sample, was carried out. To study the influence of the suspension on the vibro-oscillatory properties of the MV sample, taking into account that vertical vibrations are the determining factors in the formation of vibro-oscillatory loads (the specific significance of longitudinal and transverse vibrations in total is within 20%), a dynamic equivalent model adequate to the physical process was built for a car with a 4x4 wheel formula. According to the specified model, the structure of simulated computer modeling of the wheeled vehicles movement in the MATLAB Simulink software environment was worked out. The possibility and parameters of the deterministic setting of the heights of irregularities of the off-road micro-profile with the possibility of operational change of both the characteristics of the suspension/tires and the type and condition of the off-road were worked out. Adequacy of the model was previously evaluated by evaluating the degree of reproduction of known experimental studies and determines the feasibility of forming a typical section of the off-road micro-profile for evaluating the effectiveness of the suspension.