An overview of modal-based damage identification methods

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This paper provides an overview of methods that examine changes in measured vibration response to detect, locate, and characterize damage in structural and mechanical systems. The basic idea behind this technology is that modal parameters (notably frequencies, mode shapes, and modal damping) are functions of the physical properties of the structure (mass, damping, and stiffness). Therefore, changes in the physical properties will cause detectable changes in the modal properties. The motivation for the development of this technology is first provided. The methods are then categorized according to various criteria such as the level of damage detection provided, model-based vs. non-model-based ... continued below

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30 p.

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Farrar, C.R. & Doebling, S.W. September 1, 1997.

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Description

This paper provides an overview of methods that examine changes in measured vibration response to detect, locate, and characterize damage in structural and mechanical systems. The basic idea behind this technology is that modal parameters (notably frequencies, mode shapes, and modal damping) are functions of the physical properties of the structure (mass, damping, and stiffness). Therefore, changes in the physical properties will cause detectable changes in the modal properties. The motivation for the development of this technology is first provided. The methods are then categorized according to various criteria such as the level of damage detection provided, model-based vs. non-model-based methods and linear vs. nonlinear methods. This overview is limited to methods that can be adapted to a wide range of structures (i.e., are not dependent on a particular assumed model form for the system such as beam-bending behavior and methods and that are not based on updating finite element models). Next, the methods are described in general terms including difficulties associated with their implementation and their fidelity. Past, current and future-planned applications of this technology to actual engineering systems are summarized. The paper concludes with a discussion of critical issues for future research in the area of modal-based damage identification.

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30 p.

Notes

OSTI as DE97008872

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  • DAMAS `97, Sheffield (United Kingdom), 30 Jun - 2 Jul 1997

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  • Other: DE97008872
  • Report No.: LA-UR--97-2468
  • Report No.: CONF-9706153--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 541870
  • Archival Resource Key: ark:/67531/metadc689563

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 20, 2016, 1:39 p.m.

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Farrar, C.R. & Doebling, S.W. An overview of modal-based damage identification methods, article, September 1, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc689563/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.