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Multiple damage detection in structu...

Bajabaa, Nasser Suliman.

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Multiple damage detection in structures using a coupled modal analysis and wavelet transform technique.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Multiple damage detection in structures using a coupled modal analysis and wavelet transform technique./
Author:	Bajabaa, Nasser Suliman.
Description:	192 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0914.
Contained By:	Dissertation Abstracts International64-02B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3081515

Multiple damage detection in structures using a coupled modal analysis and wavelet transform technique.
Bajabaa, Nasser Suliman.

Multiple damage detection in structures using a coupled modal analysis and wavelet transform technique. - 192 p.

Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0914.

Thesis (Ph.D.)--University of Central Florida, 2003.

A new technique that couples modal analysis and wavelet transforms for detection of multiple damage in structures is introduced. Structural damage may cause local changes in one or more of the following parameters; stiffness, mass and damping that affect the dynamic behavior of the structure. For example, a crack reduces the stiffness of the structure in a localized sense, and thus reducing its natural frequency, and causes changes in both modal damping and mode shapes.Subjects--Topical Terms:

783786
Engineering, Mechanical.

Multiple damage detection in structures using a coupled modal analysis and wavelet transform technique.
LDR:02533nmm 2200289 4500 001 1857225
005 20040809115643.5
008 130614s2003 eng d
035 $a (UnM)AAI3081515
035 $a AAI3081515
040 $a UnM $c UnM
100 1 $a Bajabaa, Nasser Suliman. $3 1944952
245 1 0 $a Multiple damage detection in structures using a coupled modal analysis and wavelet transform technique.
300 $a 192 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0914.
500 $a Major Professor: Faissal A. Moslehy.
502 $a Thesis (Ph.D.)--University of Central Florida, 2003.
520 $a A new technique that couples modal analysis and wavelet transforms for detection of multiple damage in structures is introduced. Structural damage may cause local changes in one or more of the following parameters; stiffness, mass and damping that affect the dynamic behavior of the structure. For example, a crack reduces the stiffness of the structure in a localized sense, and thus reducing its natural frequency, and causes changes in both modal damping and mode shapes.
520 $a In this research, two different structures have been analyzed: beams and plates. First, uniform beams with a single damage (notch) of different sizes at different locations were considered. Then, a beam with multiple damages was analyzed. Secondly, a uniform plate with a single square damage was considered. For all structures considered, the responses were obtained experimentally (using experimental modal analysis) and numerically (using finite element analysis), then wavelet transform was used to detect and characterize these defects.
520 $a Most vibration-based methods require knowledge of the undamaged state of the structure, which is unavailable in most cases. However, using wavelet transformation has the advantage of not requiring knowledge of the undamaged state. In addition, wavelet transform has the characteristics that make the visualization of the signal discontinuities clear. Here, it has been found that some wavelets were able to detect the damage location for all cases. Also, it was observed that the magnitude of the wavelet coefficient increased linearly with the increase in the amount of damage.
590 $a School code: 0705.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Applied Mechanics. $3 1018410
690 $a 0548
690 $a 0346
710 2 0 $a University of Central Florida. $3 1018467
773 0 $t Dissertation Abstracts International $g 64-02B.
790 1 0 $a Moslehy, Faissal A., $e advisor
790 $a 0705
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3081515