Análise modal e estrutural de um chassi de motocicleta

Abstract

The objective of this study is to analyze the behavior of a chassis of a motorcycle through simulation, making structural and modal analysis, taking as results the deformations and tensions. Previously, to obtain information regarding the mechanical characteristics of a motorcycle chassis, destructives tests were performed. This procedure presents a high cost since for each test, a chassis is discarded. It is known that the previous study from a modal analysis makes it possible to determine the natural frequencies of a mechanical system while the structures are being designed. The data collection is relevant due to the fact that the chassis will behave in its modes of vibration, having notion if the structure will be valid or not in an actual application, based on the relation between the natural frequency and resonance. The ANSYS® and SOLIDWORKS® comercial software were used as auxiliary tool to obtain the natural frequencies and modes of vibration of the analyzed structure. Using the mathematical modeling, with the finite element method, it was possible to observe which part of the chassis showed the highest value of deformation and which part presented the highest Von-Mises’s stress, be it on the modal or the structural analysis after the simulation. Such problems were solved by adding a truss reinforcement. Simulating collision scenarios at speeds of 42m/s and 53m/s, the latter with reinforcement, and varying the exit angles and speeds, it is possible to state that the truss showed itself as a viable option to the dissipation of the efforts in the structure. These data will serve as starting parameters for the choice and construction of the chassis of the Motostudent team of the Federal University of Paraíba.