Study On Rollover Stability Of Multi-axle Heavy Vehicle Based On ADAMS

With the steady growth of national economy, the domestic highway is quicklybuilt,which has made rapid mode of logistics transportation possible. Due to its efficientand fast logistics featrues of transportation, the heavy duty truck has presentedexplosive growth. While the heavy duty vehicle has a higher gravity-center andrelatively narrow tread in comparison with the height of vehicle. Therefore the rolloverthreshold is lower, consequently, rollover accident tends to occur. In order to improvethe loading capacity,the heavy duty truck is designed to multiple axles, the rolloverstability and safety of the multi-axle heavy duty vehicles have become a bottleneckrestricting the development of road transportation enterprise. In this paper,range fromthe principle of roll to the influencing factors were studied, aiming at the roll stability ofmulti-axle heavy duty vehicles. The research results can be used to provide technicalreference in the process of product design for car companies.Firstly,the steering theory of multi-axis steering vehicle was introduced in thispaper. The relationship between the internal and external wheel Angle of the samesteering shaft and different steering shaft was researched in the process of steering. Bymeans of Lagrange equation,3DOF kinetic model of multi-axis steering vehicle wasderived, through which change of the body rolingl angle along with the change ofsteering wheel Angle was solved.Secondly, a four axis commercial vehicle uesd as the prototype, the virtualprototype model of the double front axles steering vehicle was established throughADAMS,which includes double front axles steering system, front suspension, air springsuspension, braking system, powertrain and tire subsystems.Finally,the virtual prototype model and single front axle steering vehicle carriedout the Angle Step experiment in accordance with the national standard requirements.Compared to two kinds of models of the simulation curves, it was concluded that whichof the two kinds of vehicle had higher rollover stability.The standard S-shapeexperiment was carried out by applying the virtual prototype model.The response ofdouble front axles steering vehicle was graded.The centroid position, height of masscenter,vehicle load,tire cornering stiffness,front suspension stiffness,damp and axle basewere chosen as several important influential factors on the stability of the vehicle rollover,which were separately changed to get the qualitative analysis of the response ofvehicle.