Estudo e verificação de um software de simulação para avaliação do desempenho na frenagem de um veículo conforme requisitos descritos na Resolução 519/2015 do CONTRAN

Abstract

The purpose of this study is to validate a computational simulation (software) method that can reproduce, with reliability, the tests described in Contran Resolution 519/2015 (ANBT standard NBR 10966 and its annexes) required for the homologation of the brake system of the vehicle. These tests are long and expensive because, in addition to specific vehicle and trained people, the structure of high and low friction test tracks should be made available. With this, it aims to optimize processes and development costs. For the study a 4x2 traction vehicle was used; in a Gross Vehicle Weight (GVW); with pneumatic drum brakes; with Anti-lock Braking System (ABS). The requirements for high friction test tracks for empty and loaded vehicle conditions will be considered; the engaged and disengaged gear box; brakes in normal and failed operation mode according to Contran Resolution 519/2015. The simulation model was developed to be able to evaluate the performance of the vehicles in the same conditions established by the ABNT NBR 10966 standard for the homologation of the vehicle brake system. The results obtained with this computational model and with the physical tests, when compared, show that the computational simulation model is a robust design tool that can be implemented for that analysis of vehicle performance in future brake system homologation processes. Various parameters influences can be evaluated with the aid of the program. The correlation between simulation and experimental data was evaluated with the aid of known statistical techniques. It can be concluded that the difference between the responses of the physical tests and those of the simulation can be explained by the simplification of the model, the lower accuracy of the input data, the variation of the brake pressure in the physical tests and the test track friction. However, we understand that, through the results obtained, a greater precision is not necessary at this time, as it guaranteed a minimum robustness for the analysis. As a suggestion for future work, it is proposed to complement the software with high detail of the equations and the inclusion of other systems, such as the suspensions, for example, in order to enable the evaluation of the vehicles with 6x2 and 6x4 traction.