Bancada de ensaios de frenagem para protótipo Baja SAE

Abstract

SAE BRASIL (Society of Mobility Engineers) with the Baja SAE project aims to apply practically the knowledge seen in the classroom by engineering students, where the design and construction of an off-road vehicle are carried out. The Baja Guaicurus team from the Federal University of Grande Dourados (UFGD) participates in competitions developed by SAE BRASIL and in them the theoretical framework, analytical, numerical, and experimental results of each team are evaluated. This paper aims to present the design of a bench for studies regarding the brake sector of the Baja Guaicurus project. The bench is developed to simulate the using conditions of the Baja prototype, to study and analyze the components used by the sector, besides simulating the real conditions of use of Bajas’s vehicle brake system components, which will improve the team’s evaluation in the competitions. In this project, in addition to selecting and sizing the components for their automated and safe operation, such as a 5 cv electric engine, engine shaft, 1000 N linear actuator and sensors, and protection grids, analytical and numerical studies were performed (with modeling in SolidWorks) of the components, where the von Mises stresses obtained as a result are compared with the yield and fatigue limits for each material used. In the case of the bench structure, in addition to the static loading analysis, a dynamic analysis was performed to verify the natural frequencies, so that the set does not resonate with the motor operating frequencies (8, 19 Hz and 29 Hz). For the engine shaft, in addition to dimensioning its diameters (40 mm and 30 mm), its resistance to static and fatigue efforts was also analyzed, as well as that of the beam that supports the motor. In all the analyzes carried out, von Mises stresses were obtained that were lower than the yield limits of the materials (250 MP a in the case of ASTM A36 and 310 MP a in the case of SAE 1045), as well as the fatigue limits. At the end of the project, it was verified that the bench contemplates the proposed objectives, able to be built soon for validation and studies of braking of the Baja Guaicurus vehicle.