Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Dynamic Analysis of a Geodesic Dome
Submission Author:
Lucas de Sant’Anna Vitor Barbieri , PR
Co-Authors:
Nilson Barbieri, ROBERTO Dalledone Machado, Lucas de Sant’Anna Vitor Barbieri
Presenter: Lucas de Sant’Anna Vitor Barbieri
doi://10.26678/ABCM.COBEM2017.COB17-5951
Abstract
In this work the dynamic behavior of a geodesic dome in aluminium alloy is analyzed through numerical models obtained by the Finite Element Method and tests carried out in the laboratory. It was noted that the numerical and experimental modal results have large differences. Dynamic tests were performed using impulse excitation (impact hammer) and sweep frequency through harmonic excitation (mini-shaker) to identify the natural frequencies of the structure. Using the theory of Fourier and wavelet transform, it was possible to visualize different dynamic behavior of joints. Possible causes for the differences involve the type of joint, the fixing of the elements in the joints, the profile adopted for the elements and boundary conditions for the numerical model. Some joints presented snap through buckling phenomenon, which are being studied and evaluated. Isolated joints were built to study the vibration propagation, and then, compare with the whole structure.
Keywords
geodesic dome, fourier transform, Vibrations
