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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
Resource Information
The item Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves, by Haoguang Deng represents a specific, individual, material embodiment of a distinct intellectual or artistic creation found in University of Missouri Libraries.This item is available to borrow from all library branches.
Resource Information
The item Damage inspection of isotropic/multi-layer plates by time-frequency analysis of lamb waves, by Haoguang Deng represents a specific, individual, material embodiment of a distinct intellectual or artistic creation found in University of Missouri Libraries.
This item is available to borrow from all library branches.
- 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
- 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
- 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
- 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
- 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
- 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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