Análise dinâmica e estrutural de um chassi tubular através de elementos finitos com validação experimental

Abstract

A vehicle is classified as off -road when it is able to travel on runways that present different types of obstacles, which can be overcome by the vehicle. The chassis of an off –road vehicle known as Mini-Baja is the object of study of this dissertation. The project, detailed design, construction and testing of the vehicle for SAE competitions are carried out by teams of engineering students, who represent their respective Higher Education Institutions from various locations around the world. The chassis under study in this work was developed by the Baja Pampa team, composed of students from the Federal University of Pampa – Alegrete. The chassis structure, considered of complex geometry, is modeled by the Finite Element Method (FEM) with ANSYS® APDL (Ansys Parametric Design Language) software, using a BEAM189 bar element type. Then static and dynamic analyses (modal, harmonic and spectral) are developed considering different boundary conditions and loads. In order to validate the results obtained from the computational model data collection devices (accelerometers and extensometers) are instrumented to the structure and so are deloped a frequency test, to obtain the natural frequencies of the structure, and the application of a static load for the obtaining the stress level. The numerical model show values of natural frequencies and stress levels coherents with values measured experimentally. Initially, modifications are proposed in the current structure, aiming at improving the sporting performance of the vehicle and also a new chassis model of chassis that serves as basis for a new project of the Team.