Desenvolvimento de uma superfície de resposta que corresponde ao torque necessário no volante para manter o veículo andando em linha reta e as influências dos fatores entrada no resultado final

Abstract

Several attributes are important to increase the costumer perception of vehicle quality. Steering pull is one of these factors, which mean consistent pull to one side on a straight flat road while maintaining a constant speed. Steering pull is related to Camber, Caster, Toe and other attributes related to tire’s design. These factors are geometric characteristics defined on project phases influenced by dimensional variation from manufacture and assembly of body and suspension components and tires. How to define parts and subassemblies tolerances to optimize wheel alignment characteristics? What is the dimensional variation impact on the quality results of directional dynamic of the vehicle? How is the influence of the factor at the final value of vehicle residual align torque? One computational model was developed to predict the dimensional variation of every geometric characteristic based on parts tolerances and evaluate the main contributors to variation of a common compact vehicle with MacPherson frontal suspension and Twist Beam rear suspension. The dimensional variation results were added to a dynamic model developed at MSC.ADAMS, together with tire properties and allowed to define the important factors, create a polynomial response surface and study how is the behavior of VRAT influenced by each factor.