A EFFICIENT METHOD OF STRUCTURAL IDENTIFICATION

Abstract

A technique for identifying the structural parameters from the vibration parameters such as mass, damping and stiffness is developed and tested using the numerically simulated noise free and noisy data, as well as experimented data. The eigen parameters and the transfer functions are obtained by the RD, FFT and the ERA method used. The mass, damping and stiffness matrix of the structural system are assumed to be linear functions of structural parameters to be determined and non-iterative identification method for noise free data is derived. Then the procedure is combined with Kalman filtering procedure to deal with noisy data. Structural parameters are identified well for data with small noise. For the data contaminated by large observation noise and unknown force, use of transfer functions obtained from force vibration are effective.