Theoretical bases of formation of wheeled military automotive equipment suspension system parameters in off-road driving conditions

Abstract

The paper consideres formation of suspension system elastic damping characteristics of wheeled military automotive equipment (MAE) samples and conditions of crew protection against dynamic loads while driving off-road.
A physical model to study transverse-angular oscillations of a MAE sample with nonlinear force characteristic of a cushion system is constructed. Especially for this purpose a mathematical model of transverse-angular oscillations of a spring-mounted part (SMP) during the movement of a MAE sample along the road with unevenness is designed. On the basis of its analytical solution it is obtained the dependence of the intrinsic transverse angular oscillations frequency on the amplitude at different parameters that characterize the elastic force of the shock absorbers.
The influence of a whole set of suspension parameters of a MAE sample as well as the profile of road unevenness on the dynamics of SMP at different speeds of motion is investigated. In particular, it is defined that for MAE samples with the progressive characteristic of the cushion system at higher values of static deformation variable of elastic shock absorbers, the yield amplitude from the following unevenness is slightly larger than the previous one. In addition, at higher magnitude of velocities along the road with unevenness, the amplitude of the transverse angular oscillations is smaller. Besides, with the same speeds and static deformations of the elastic shock absorbers, the yield amplitude from the unevenness according to the progressive law of elastic shock absorbers change is slightly smaller than that of the regressive one.
Key words: off-road, oscillatory motions and vibrations, vehicle suspension system, wheeled military automotive equipment (MAE), transverse-angular oscillations.