Title : STRUCTURAL FINITE ELEMENT MODEL UPDATING USING FREQUENCY RESPONSE FUNCTION DATA
Authors : D Bandyopadhyay, J S Ali and R Mitra
Publication : 8 - 10, October 2015
Volume : 2
Pages :
Price : 250
Abstract : A structural finite element model updating technique is proposed using Frequency Response Function (FRF) data and extracted natural frequencies of the damaged structure. To decrease nonlinearity of the model updating process, the change of FRF of a structure is correlated to the change of stiffness and mass through sensitivity equations, which have been derived using the change of eigenvectors and extracted natural frequencies of the damaged structure. The change of eigenvector is also expressed as the linear combination of damaged eigenvectors for the measured modes. Eigenvector participation factor is expressed as a function of the perturbation of the stiffness and mass. The set of sensitivity equations is solved by the least square algorithm. Numerical example using a truss structure confirms that the procedure is an effective model updating technique for structural health monitoring purposes.