
Proceedings Paper
Structural boundary effects and their applications to health monitoringFormat | Member Price | Non-Member Price |
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Paper Abstract
A signal decomposition method for extracting boundary effects from
an Operational Deflection Shape (ODS) of a structure under
harmonic excitation is presented here. It decomposes an ODS into
central and boundary solutions using a sliding-window
least-squares curve-fitting technique. The obtained boundary
solutions can be used to reveal damage locations, and the central
solutions can be used to identify boundary conditions. Except an
experimental ODS the method requires no model or historical data
for comparison. For numerical simulations, exact mode shapes and
ODSs of beams with damage are obtained by spectral element
analysis. Boundary and central solutions caused by different
boundary conditions, different loading conditions, and different
damage with or without noise are simulated and characterized.
Numerical results show that Gibbs' phenomenon caused by the use of
continuous functions to fit ODSs with discontinuous first-,
second-, and/or third-order derivatives actually makes boundary
solutions excellent damage indicators. Several experiments are
performed using a scanning laser vibrometer for sensing and a PZT
patch for actuation. The experimental results confirm the
feasibility and accuracy of this Boundary Effect Evaluation Method
(BEEM) in detecting multiple defects and identifying boundary
conditions of beams.
Paper Details
Date Published: 21 July 2004
PDF: 12 pages
Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); doi: 10.1117/12.538111
Published in SPIE Proceedings Vol. 5394:
Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III
Tribikram Kundu, Editor(s)
PDF: 12 pages
Proc. SPIE 5394, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III, (21 July 2004); doi: 10.1117/12.538111
Show Author Affiliations
Perngjin Frank Pai, Univ. of Missouri/Columbia (United States)
Lu Huang, Univ. of Missouri/Columbia (United States)
Lu Huang, Univ. of Missouri/Columbia (United States)
Sharath H. Gopalakrishnamurthy, Univ. of Missouri/Columbia (United States)
Jaycee H. Chung, Global Contour, Inc. (United States)
Jaycee H. Chung, Global Contour, Inc. (United States)
Published in SPIE Proceedings Vol. 5394:
Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems III
Tribikram Kundu, Editor(s)
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