Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
USE OF LATERAL DYNAMICS AND THE LEVENBERG MARQUARDT METHOD TO ESTIMATE PARAMETERS OF A PICKUP TRUCK
Submission Author:
Bruna Loiola , RJ , Brazil
Co-Authors:
Adrián Eduardo Simioni, VICTOR SANTORO SANTIAGO, Bruna Loiola, RICARDO TEIXEIRA DA COSTA NETO, Camila Pereira
Presenter: Adrián Eduardo Simioni
doi://10.26678/ABCM.COBEM2021.COB2021-1730
Abstract
Numerical analysis and computational solutions are widespread among automotive engineering projects, mainly in the early stages where uncertainties and lack of data play an important role and become some of the main problems to be solved by designers. In cases where a utility vehicle is adapted to transport a special module, care must be taken with the variability of its parameters. This type of modification usually changes the vehicle's center of gravity from its primary position, which makes the maneuvers difficult to be performed at higher speeds, increasing the tendency to rollover. Thus, a methodology is proposed to evaluate the behavior of the lateral dynamics of a utility vehicle weighing up to 3,500 kgf which has its original bucket replaced by another with a military application, finding new parameters that allow it to maintain its performance in curves as close as possible of the original. Therefore, it was chosen to estimate the spring stiffness and parameters of the suspension dampers for this new configuration. In this work, a model of 4 degrees of freedom is applied considering the lateral and longitudinal dynamics of a vehicle in a double lane change test and considering the model proposed by Dugoff to represent the behavior of the tires. The numerical solution was obtained in the MATLAB / Simulink® software using the Power Flow method. Numerical verification was performed by comparing the dynamic response behavior of the proposed model with results from the Carsim® software, which is a commercial package used in vehicle development. The inverse analysis was performed by the Levenberg-Marquardt method considering the measurements of the roll angle during a double lane change maneuver. The estimated suspension constants allow necessary changes to be made to the vehicle's characteristics, adapting requirements and improving its dynamic behavior, reducing time, accident risks, costs and other resources that can be used in later stages of the project.
Keywords
Lateral dynamics, Nonlinear tire model, Inverse problems, Levenberg-Marquardt method
