Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
A MULTIBODY-DYNAMIC MODEL TO STUDY THE INFLUENCE OF HAUL TRUCK SUSPENSION SETUP ON THE CHASSIS MECHANICAL BEHAVIOR
Submission Author:
Alvaro Estanislau Dantas , MG
Co-Authors:
Alvaro Estanislau Dantas, Marco Túlio Faria
Presenter: Alvaro Estanislau Dantas
doi://10.26678/ABCM.COBEM2023.COB2023-0476
Abstract
The vibration generated by unpaved road roughness of mining sites can not only lead to health problems on the vehicle driver but also reduce the haul truck useful life. A crucial component in the design of these vehicles employed in the mining industry is the hydropneumatic suspension (HPS), whose physical parameters and setup variables must be carefully estimated in order to attenuate the vibration transmitted from the tire-soil contact through all vehicle subsystems. In this work, an analytical investigation is performed to assess the influence of some HPS parameters, such as nitrogen-oil initial ratio and tire pressure, on the mechanical behavior of the chassis of mining haul trucks. These parameters are selected due to the feasibility of adjustment to improve the vehicle ride dynamics. A multibody dynamic model using the commercial package ADAMS Car® is developed to estimate forces acting on the truck chassis for different setup parameters during operation on rough unpaved roads. Firstly, predictions are compared to experimental data to validate the suspension pressure behavior and to choose a proper road roughness model for the subsequent analysis. Mean and peak values of suspension pressure show good correspondence to field collected data. Later, the multibody model is tested on a double lane change maneuver with uneven road conditions to investigate the generated suspension loads for three different setups for loaded and unloaded truck. Multibody model indicates significant differences on the suspension loads for each setup. These forces combined with other components loading are imposed on a finite element model of the chassis to evaluate the influence of each suspension setup on the chassis stress fields. The results rendered in this work indicate that, from a static point of view, maximum stresses are slightly lower for softer setup when the truck is unloaded. For loaded truck, the results of maximum stresses do not show a clear pattern since other sources of load can contribute to the frame loading. However, looking at stress ranges counted by Rainflow method, overall results indicate that softer suspensions may induce improved frame lifetime, in contrast to more rigid setups. It is noteworthy to state that although decreasing the suspension stiffness can generate a positive impact on the chassis durability, further investigations about its influence on the driver’s cabin vibration, lateral vehicle dynamics and sprung mass roll angle must be performed to evaluate the impact of different suspension setups in whole-body vibration (WBV) and handling performance.
Keywords
mining haul truck, hydropneumatic suspension, multibody dynamics, Truck chassis, Ride Dynamics
