Damage detection of beam by natural frequencies: general theory and procedure

Abstract

The frequency equation of single damaged beam has been established for arbitrary boundary conditions that is the main tool for analysis as well as identification of damaged beam by using measured natural frequencies. A procedure for damage detection problem presented in this paper consists of three steps. First, the modelling error is reduced by a model updating procedure, in which the material, geometrical parameters and boundary conditions are updated. Then, measurement data are corrected based on the updated model. Finally, the damage parameters are identified using updated model and corrected measurement data. Theoretical investigation is illustrated by an example. Keywords: damage detection, model updating, beam. Vietnam Journal of Mechanics, VAST, Vol. 28, No. 2 (2006), pp. 120-132