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COB1358 ANÁLISE NUMÉRICA E EXPERIMENTAL DE UMA PLATAFORMA DE FORÇAS / Numerical and Experimental ANALYSIS of a Force Platform

Rafael Antônio Comparsi Laranja, Léia Bernardi Bagesteiro, Alberto Tamagna

Departamento de Engenharia Mecânica, Grupo de Mecânica Aplicada, Escola de Engenharia, UFRGS

Sarmento Leite, 425 Porto Alegre, RS, CEP 90050-170, Brasil - E-mail: comparsi@vortex.ufrgs.br.

This paper presents a comparison with numerical and experimental analysis of a force plate. The platform was built with four octagonal steel load cells, each one measures two uncoupled forces, horizontal and vertical. The complete system allows to measures three orthogonal forces and three moments. The load cells were analyzed using the finite element method, the element used was a structural solid element (20 nodes) and the aluminum plates used a structural shell element (8 nodes). Dynamic analysis was developed to determine the lowest natural frequencies with permits to get the working frequency band. The experiment to get the frequency response, was realized bounding an accelerometer in each direction of a force plate connected to Fast Fourier Analyzer. Numerical and experimental results were compared, the resulting linear frequency band is zero to 180 Hz in a conservative form.

Keywords: Force, platform, modal analysis, numerical simulation, experimental analysis. Força, plataforma, analise modal, simulação numérica, analise experimental.