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The Resource Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves, by Haoguang Deng

Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves, by Haoguang Deng

Creator
Author
Contributor
Summary
Wave-based technique is one major approach for damage inspection of structures. To detect a small damage, an elastic wave's wavelength often needs to be as small as the damage size and hence the frequency needs to be high. Unfortunately, high-frequency wave dynamics always involves complicated wave reflection, refraction and diffraction, and it is difficult to separate them in order to have detailed examination and system identification. This research work investigates dynamic characteristics of Lamb waves in plates that can be used for material evaluation and damage inspection of thin-walled structures. A one-dimensional finite-element modeling and analysis technique is developed for computing dispersion curves and all symmetric and anti-symmetric modes of Lamb waves in isotropic and multi-layer plates. Moreover, a conjugate-pair decomposition (CPD) method is introduced for time-frequency analysis of propagating Lamb waves. Results show that, under a k-cycle sine-burst excitation at a plate's edge, the time-varying frequency of a surface point's response can reveal the Lamb wave propagating inside the plate being a symmetric or anti-symmetric mode. The frequency of the measured wave packet increases from the wave front to the trailing edge if it is a symmetric mode, and the frequency decreases from the wave front to the trailing edge if it is an anti-symmetric mode. Moreover, interaction of two different waves results in a peak in the time-frequency curve. These characteristics can be used for accurate wave separation and speed identification of different waves to enable fast and accurate material evaluation and damage inspection. Results from transient finite-element analysis of Lamb waves propagating in finite plates with crack/delamination show that k-cycle sine-burst probing waves are good agents for wave-based damage inspection of plates. Although crack and delamination introduce different waves into and complicate the probing wave packet, time-frequency analysis makes it possible to separate such damage-induced small waves from the probing wave and enables fast and accurate damage inspection of thin-walled structures
Language
eng
Work
Publication
Extent
1 online resource (x, 90 pages)
Note
  • "MAY 2014."
  • "A Thesis Presented to the Faculty of the Graduate School at the University of Missouri In Partial Fulfillment Of the Requirements for the Degree Master of Science."
  • Thesis supervisor: Dr. P. Frank Pai
Instance
Label
Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves
Title
Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves
Statement of responsibility
by Haoguang Deng
Creator
Contributor
Author
Thesis advisor
Subject
Genre
Language
eng
Summary
Wave-based technique is one major approach for damage inspection of structures. To detect a small damage, an elastic wave's wavelength often needs to be as small as the damage size and hence the frequency needs to be high. Unfortunately, high-frequency wave dynamics always involves complicated wave reflection, refraction and diffraction, and it is difficult to separate them in order to have detailed examination and system identification. This research work investigates dynamic characteristics of Lamb waves in plates that can be used for material evaluation and damage inspection of thin-walled structures. A one-dimensional finite-element modeling and analysis technique is developed for computing dispersion curves and all symmetric and anti-symmetric modes of Lamb waves in isotropic and multi-layer plates. Moreover, a conjugate-pair decomposition (CPD) method is introduced for time-frequency analysis of propagating Lamb waves. Results show that, under a k-cycle sine-burst excitation at a plate's edge, the time-varying frequency of a surface point's response can reveal the Lamb wave propagating inside the plate being a symmetric or anti-symmetric mode. The frequency of the measured wave packet increases from the wave front to the trailing edge if it is a symmetric mode, and the frequency decreases from the wave front to the trailing edge if it is an anti-symmetric mode. Moreover, interaction of two different waves results in a peak in the time-frequency curve. These characteristics can be used for accurate wave separation and speed identification of different waves to enable fast and accurate material evaluation and damage inspection. Results from transient finite-element analysis of Lamb waves propagating in finite plates with crack/delamination show that k-cycle sine-burst probing waves are good agents for wave-based damage inspection of plates. Although crack and delamination introduce different waves into and complicate the probing wave packet, time-frequency analysis makes it possible to separate such damage-induced small waves from the probing wave and enables fast and accurate damage inspection of thin-walled structures
Cataloging source
MUU
http://library.link/vocab/creatorDate
1989-
http://library.link/vocab/creatorName
Deng, Haoguang
Degree
M.S.
Dissertation note
Thesis
Dissertation year
2014.
Government publication
government publication of a state province territory dependency etc
Granting institution
University of Missouri--Columbia
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/relatedWorkOrContributorName
Pai, P. Frank
http://library.link/vocab/subjectName
  • Thin-walled structures
  • Materials
  • Lamb waves
  • Frequencies of oscillating systems
Label
Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves, by Haoguang Deng
Instantiates
Publication
Note
  • "MAY 2014."
  • "A Thesis Presented to the Faculty of the Graduate School at the University of Missouri In Partial Fulfillment Of the Requirements for the Degree Master of Science."
  • Thesis supervisor: Dr. P. Frank Pai
Accompanying material
2 supplementary files
Bibliography note
Includes bibliographical references (pages 89-90)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
956316315
Extent
1 online resource (x, 90 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color) +
Specific material designation
remote
System control number
(OCoLC)956316315
Label
Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves, by Haoguang Deng
Publication
Note
  • "MAY 2014."
  • "A Thesis Presented to the Faculty of the Graduate School at the University of Missouri In Partial Fulfillment Of the Requirements for the Degree Master of Science."
  • Thesis supervisor: Dr. P. Frank Pai
Accompanying material
2 supplementary files
Bibliography note
Includes bibliographical references (pages 89-90)
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
956316315
Extent
1 online resource (x, 90 pages)
Form of item
online
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (some color) +
Specific material designation
remote
System control number
(OCoLC)956316315

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