Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/22684
Title: Characterizing damage in plate structures based on local perturbance to dynamic equilibrium
Authors: Xu, H
Cheng, L 
Su, Z 
Issue Date: 2011
Source: Structural health monitoring 2011 : Condition-based maintenance and intelligent structures - Proceedings of the 8th International Workshop on Structural Health Monitoring, 2011, v. 1, p. 95-102 How to cite?
Abstract: Although vibration-based damage detection has been practiced over the years with demonstrated success, such a technique may suffer from some bottlenecks including strong dependence on benchmarks, baseline signals or pre-developed global models, needs of additional excitation sources, excessive susceptivity to boundary conditions but less sensitivity to damage until it reach a noticeable level. A novel damage identification approach was developed by examining the local perturbance to structural equilibrium characteristics described by higher-order spatial derivatives. To reduce the influence of measurement noise on identification accuracy during obtaining higher-order spatial derivatives, two de-noising options were proposed including applying a wavenumber-based signal filtering and appropriately adjusting measurement configuration, to enhance the capacity of noise-tolerance of the method. The developed approach was experimentally validated by detecting damage in a plate component of a structural system with irregular boundaries, showing satisfactory results in pinpointing the damage. In principle the method is applicable to complex systems comprising various structural components such as beams, plates and shells, provided that the local equilibrium relationship for the component under current inspection is known a prior.
Description: 8th International Workshop on Structural Health Monitoring 2011: Condition-Based Maintenance and Intelligent Structures, Stanford, CA, 13-15 September 2011
URI: http://hdl.handle.net/10397/22684
ISBN: 9781605950532
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