Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12648
Title: Substructure methods for structural condition assessment
Authors: Law, SS
Yong, D
Issue Date: 2011
Publisher: Academic Press
Source: Journal of sound and vibration, 2011, v. 330, no. 15, p. 3606-3619 How to cite?
Journal: Journal of sound and vibration 
Abstract: It is commonly known that an accurate analysis of a large structure requires an accurate analytical model. This is also true for the inverse analysis of a structural system where measured structural responses are used as input to assess the structural conditions. However, an accurate model of the structure is always not available in practice. Two substructural identification methods are presented in this paper with the structure divided into substructures and with one substructure assessed at one time. In the first method, an accurate finite element model of the whole structure is assumed known. A state space method is applied to identify the external forces acting on the structure, and a damage identification method is then applied to identify the local damages using time domain information. Iterative model updating method based on the measured acceleration in the selected substructure is employed for the assessment. The second identification method requires only the finite element model of the substructure. The interface forces and the external forces acting on the target substructure are all taken as excitations and they are identified in state space. The substructure is then assessed similar to the first method. Since the target substructure for updating consists of a much reduced number of components and the identification problem is more efficient. The validation of the proposed methods is demonstrated by a truss structure with polluted measured accelerations with promising results.
URI: http://hdl.handle.net/10397/12648
ISSN: 0022-460X
EISSN: 1095-8568
DOI: 10.1016/j.jsv.2011.03.003
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