Engenharia Mecânica

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https://repositorio.fei.edu.br/handle/FEI/23

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Navegando Engenharia Mecânica por Autor "AFONSO, B."

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  • Nenhuma Miniatura disponível
    Artigo de evento
    Device for Measuring Efforts Generated by Tire in Steering Conditions
    (2018-09-03) CHICUTA, W.; AFONSO, B.; Roberto Bortolussi; Sergio Delijaicov
    © 2018 SAE International. All Rights Reserved.Currently, large companies as well as universities have increased the studies into vehicular dynamic behavior, mainly in order to improve driver and passenger safety. Simulations with complete model vehicle have been used for these studies. The tire is one of the most important vehicular component as the only connection with the ground and responsible for transmitting all vertical, longitudinal and lateral forces, consequenetly it is the main component on the model vehicle, being crucial for the correlation between computer simulations results and field tests, This paper presents a methodology, development and construction of a device to obtain lateral forces in any combination of toe and camber angles for different conditions of normal load, the tests can be performed on any type of ground, whether dry or wet. The tire datas used as reference were obtained through an experimental test using "Flat Trac" equipment. Based on these data, the components used to measuare the tire force, were developed. After the device construction, bench tests were performed in order to validate all project assumptions and calibrate the device. Finally, the device was installed on a small truck and a verification test were performed.
  • Nenhuma Miniatura disponível
    Artigo de evento
    Test and Validation of Vehicle Vertical Dynamics in a Multibody Doftware
    (2015-09-22) AFONSO, B.; CHICUTA, W.; Roberto Bortolussi
    Copyright © 2015 SAE International.This paper shows the elaboration of studies about the driver's comfort in a Baja SAE vehicle in different track conditions. The multibody model was designed in ADAMS VIEW software with full vehicle components aim evaluate frequencies, accelerations and displacements in any part of the vehicle. Several tests and measurements were made to acquire springs, dampers and tire data to ensure the model represents the real vehicle. The full vehicle and also the driver were modeled through a CAD software, thus all geometries, mass and inertias were inputted in the multibody model based on the built vehicle. The vertical displacements were modeled in the multibody software simulating the road profile, so it was possible to analyze the vehicle ride behavior with different set ups in different tracks. The validation of multibody mathematical model was made by modeling the same maneuver that the vehicle instrumented with data acquisition was submitted. The mathematical model output and the data acquisition results were confronted and the results shows that the mathematical model can be considered validated. After the mathematical model be validated, it can be use in future analysis with high confidence level. This model will be helpful to evaluate design and make modifications in earlier phases of vehicle development, reducing cost, engineering time, prototype manufacturing and mainly time in test phase once that will be necessary just the fine tuning.
  • Nenhuma Miniatura disponível
    Artigo de evento
    Test and Validation of Vehicle Vertical Dynamics in a Multibody Software
    (2015-09-05) AFONSO, B.; CHICUTA, W.; Roberto Bortolussi
    Copyright © 2015 SAE International.This paper shows the elaboration of studies about the driver's comfort in a Baja SAE vehicle in different track conditions. The multibody model was designed in ADAMS VIEW software with full vehicle components aim evaluate frequencies, accelerations and displacements in any part of the vehicle. Several tests and measurements were made to acquire springs, dampers and tire data to ensure the model represents the real vehicle. The full vehicle and also the driver were modeled through a CAD software, thus all geometries, mass and inertias were inputted in the multibody model based on the built vehicle. The vertical displacements were modeled in the multibody software simulating the road profile, so it was possible to analyze the vehicle ride behavior with different set ups in different tracks. The validation of multibody mathematical model was made by modeling the same maneuver that the vehicle instrumented with data acquisition was submitted. The mathematical model output and the data acquisition results were confronted and the results shows that the mathematical model can be considered validated. After the mathematical model be validated, it can be use in future analysis with high confidence level. This model will be helpful to evaluate design and make modifications in earlier phases of vehicle development, reducing cost, engineering time, prototype manufacturing and mainly time in test phase once that will be necessary just the fine tuning.