LONGITUDINAL DYNAMIC MODELING OF A LIGHTWEIGHT OFF-ROAD VEHICLE USING JULIEN’S THEORY

LONGITUDINAL DYNAMIC MODELING OF A LIGHTWEIGHT OFF-ROAD VEHICLE USING JULIEN’S THEORY

Costa Neto, Ricardo Teixeira da; Sousa, Lucas Castro

Artigo:

With the computational advance, the virtual simulation of vehicle systems has become of extreme importance, due to the fact of providing reduction of the cost and operational times. Thus, models that represent more reliable physical phenomenon are required. In this way, this paper presents a modeling, developed in Blocks Diagram, of the longitudinal dynamics of a lightweight off-road vehicle with Rear-Wheel Drive (RWD) and CVT transmission, using a tire model. The model consists of the engine, CVT transmission and a fixed gearbox, linked to semi-axles, which are connected to the wheels. For a better understanding of the physical phenomenon, a model of the tire-soil interaction is required. Therefore, Julien’s Theory is used, a semi-empirical model that relates the traction force to the longitudinal slip at the contact region between the tire and the ground, allowing us to verify with greater proximity to the reality, the behavior of the transmission system as well as the behavior of the longitudinal dynamics of the vehicle.

With the computational advance, the virtual simulation of vehicle systems has become of extreme importance, due to the fact of providing reduction of the cost and operational times. Thus, models that represent more reliable physical phenomenon are required. In this way, this paper presents a modeling, developed in Blocks Diagram, of the longitudinal dynamics of a lightweight off-road vehicle with Rear-Wheel Drive (RWD) and CVT transmission, using a tire model. The model consists of the engine, CVT transmission and a fixed gearbox, linked to semi-axles, which are connected to the wheels. For a better understanding of the physical phenomenon, a model of the tire-soil interaction is required. Therefore, Julien’s Theory is used, a semi-empirical model that relates the traction force to the longitudinal slip at the contact region between the tire and the ground, allowing us to verify with greater proximity to the reality, the behavior of the transmission system as well as the behavior of the longitudinal dynamics of the vehicle.

Palavras-chave:

DOI: 10.5151/simea2018-PAP20

Referências bibliográficas

• [1] GILLESPIE, T. D. Fundamentals of vehicle dynamics. Warrendale: SAE, 1992. [2] WONG, J. Y. Theory of ground vehicles. New York: John Wiley & Sons, 2001. [3] JAZAR, R. N. Vehicle dynamics: theory and application. New York: Springer, 2008. [4] ALBUQUERQUE, A. A. Caracterização da resposta dinâmica de uma CVT por polias expansíveis. 2003. [5] CROLLA, D. A. Automotive engineering: powertrain, chassis system and vehicle body. Burlington: Butterworth-Heinemann, 2009. [6] NAUNHEIMER, H., et al. Automotive transmissions. New York: Springer, 2011. [7] LOPES, E. D. R. Análise do comportamento dinâmico de um veículo leve 4 x 4 com sistema de controle de tração. 2015. [8] KARNOPP D. C., et al. System dynamics: modeling and simulation of mechatronic systems. Hoboken: John Wiley & Sons, 2012. [9] SANCHAWAT, A., et al. Simulation of a drivetrain of a vehicle comprising Continuously Variable Transmission. International Journal of Engineering and Technology, v. 5, n. 3, p. 3041-3050, 2013. ISSN: 0975-4024. [10] SAE. 24a Competição Baja SAE BRASIL. Disponível em: < https://bajasaebrasil.online/ prova.php?id=18BR_VEL >. Acesso em: 25 de março de 2018.

Como citar:

Costa Neto, Ricardo Teixeira da; Lucas Castro Sousa; "LONGITUDINAL DYNAMIC MODELING OF A LIGHTWEIGHT OFF-ROAD VEHICLE USING JULIEN’S THEORY", p-137-146. In: . São Paulo: Blucher, 2018.
ISSN 23577592, DOI 10.5151/simea2018-PAP20