Reconstructing structural changes in a dynamic system from experimentally identified state-space models

B. H. Koh, S. Nagarajaiah, M. Q. Phan

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

This paper presents an experimental investigation of a recently developed Kronecker Product (KP) method to determine the type, location, and intensity of structural change from an identified state-space model of the system. Although this inverse problem appears to be highly nonlinear, the system mass, stiffness, and damping matrices are identified through a series of transformations, and with the aid of the Kronecker product, only linear operations are involved in the process. Since a state-space model can be identified directly from input-output data, an initial finite element model and/or model updating is not required. The test structure is a two-degree-of-freedom torsional system in which mass and stiffness are arbitrarily adjustable to simulate various conditions of structural change or damage. This simple apparatus illustrates the potential applicability of the system identification technique for damage detection problems by not only identifying the location and the extent of the damage, but also differentiating the nature of the damage. The results are successfully confirmed by laboratory tests.

Original languageEnglish
Pages (from-to)103-112
Number of pages10
JournalJournal of Mechanical Science and Technology
Volume22
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • Kronecker product
  • State-space model
  • Structural damage
  • System identification

Fingerprint

Dive into the research topics of 'Reconstructing structural changes in a dynamic system from experimentally identified state-space models'. Together they form a unique fingerprint.

Cite this