Engenharia Mecânica
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/23
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5 resultados
Resultados da Pesquisa
- Test and Validation of Vehicle Vertical Dynamics in a Multibody Software(2015-09-05) AFONSO, B.; CHICUTA, W.; Roberto BortolussiCopyright © 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.
- Test and Validation of Vehicle Vertical Dynamics in a Multibody Doftware(2015-09-22) AFONSO, B.; CHICUTA, W.; Roberto BortolussiCopyright © 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.
- Heat Transfer Analysis in a Usual Ventilated Brake Disc(2015-05-13) CIOLFI, M. J.; Paulo de MelloCopyright © 2015 SAE International.This paper presents the different "gradients" of heat transfer coefficients found in a usual ventilated brake disc type. Although the conduction coefficient depends on the material characteristics applied, the convection and radiation coefficients changes as function of vehicle speed and brake temperature respectively. By comparing the coefficients magnitude orders of each surface and condition is possible to define the most favorable geometries for cool down the system.
- Study of Geometric Parameters for Validation and Reduction Effort in Steering System of a Vehicle FSAE(2015-09-22) TOGNOLLI, A.; SERAFIM, C. C. G.; GARCIA, B. A.Copyright © 2015 SAE International.This paper explores the method of modeling and validation the computational tools able to accurately replicate the dynamic behavior of a Formula SAE vehicle. Based on limitations in conducting physical tests, it is possible to mathematically predict the forces and momentum generated on the steering column of the vehicle, minimizing effort and improving driver comfort even before the component physically manufactured. The results in permanent state due technical instrumentations were used in the physical vehicles and compared with other proposals (skid Pad test). As the software simulating the same path, it was possible to adopt values of speed and wheel steering, allowing compare the dynamics of the vehicle, through the signals from other sensors installed in the data acquisition system, validating the behavior of the models presented in permanent state. Other aspects were studied to understand vehicle behavior concerning lateral stability and steering behavior. In order to improve the steering system, the axle sleeve was changed, resulting in driver's less effort on handling. This proposal was compared to virtual models noting the efficiency of multibody models and was observed the decrease in an effort to turn the steering wheel.
- 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.