Numerical Analysis on the Risk of Rollover of Heavy Duty Truck at Curve Running

Abstract

This paper deals with response behavior and rollover resistance of heavy duty truck in cornering. Our goal of research is to prevent the truck from rollovering by incorporating the rollover prevention device into the truck. In this study, the truck is expressed by nonlinear-four-wheel model that has 3 degree of freedom, that is, roll angle, yaw angular speed and side slide angle. The equations of motion include the nonlinear property of the tire lateral force. These equations are solved by numerical calculation, and running locus and wheel load are caluculated. We use the rate of decrease of wheel load as the index for judging rollover. We perform parameter study about the height of center of gravity, the running speed and so on, and investigate the degree of the risk of rollover. Furthermore, by comparing the model with the rollover prevention device utilizing semiactive suspension and that without it, we show the usefulness of this device.