Vehicle Energy Dissipation during Curb Traversal

Previously published vehicle curb traversal test data for 122 full-scale vehicle tests were examined to evaluate the change in a vehicle’s kinetic energy during traversal of a roadside curb while rolling on its wheels. This change in energy was correlated to test parameters including the ratio of tire radius to curb height, vehicle approach angle, and vehicle speed at curb contact. Various regression relationships quantifying the change in vehicle kinetic energy during curb traversal versus the above parameters were examined, wherein the kinetic energy change was expressed as an equivalent energy speed (EES) in which the energy change was normalized using the test vehicle’s mass. No statistical significance was observed in relations involving EES as a function of parameters which included approach angle and the ratio of tire radius to curb height. The greatest correlation was found in an equation relating EES solely to vehicle speed at the time of curb contact, the relation for which is presented herein.