Model Updating of an Enclosure Using Imaginary Elements
This study was of two phases, one aspect tailored towards matching of the natural frequencies between experimental and finite element results and the second, focused on the effect of damping on the frequency response functions. The experimental Modal Analysis was performed on the real structure to characterize the dynamic behavior in terms of modes, natural frequency and damping using Bruel and Kjaer software. The base of the enclosure was clamped and could be an area of energy dissipation and a source of damping. This boundary condition was model with imaginary joint elements. The dynamic analysis was realized using the Lanczos tool in ANSYS 12 finite element code to extract the modes and also harmonic response analysis was conducted to get the response functions. The linear and rotational stiffness of the boundaries and structural stiffness of the panels were used as updating parameters, tailored towards minimisation of the percentage error in the natural frequencies. The inclusion of damping reduced the amplitude of vibration.
R. L. Burguete, M. Lucas, E. A. Patterson, S. Quinn
O.S. David-West et al., "Model Updating of an Enclosure Using Imaginary Elements", Applied Mechanics and Materials, Vol. 70, pp. 309-314, 2011