Detection of damage in welded structure using experimental modal data
A typical automotive structure could contain thousands of spot weld joints that contribute significantly to the vehicle's structural stiffness and dynamic characteristics. However, some of these joints may be imperfect or even absent during the manufacturing process and they are also highly sus...
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my.utm.457332017-06-19T04:49:33Z http://eprints.utm.my/id/eprint/45733/ Detection of damage in welded structure using experimental modal data Ouyang, H Abu Husain, Nurulakmar TJ Mechanical engineering and machinery A typical automotive structure could contain thousands of spot weld joints that contribute significantly to the vehicle's structural stiffness and dynamic characteristics. However, some of these joints may be imperfect or even absent during the manufacturing process and they are also highly susceptible to damage due to operational and environmental conditions during the vehicle lifetime. Therefore, early detection and estimation of damage are important so necessary actions can be taken to avoid further problems. Changes in physical parameters due to existence of damage in a structure often leads to alteration of vibration modes; thus demonstrating the dependency between the vibration characteristics and the physical properties of structures. A sensitivity-based model updating method, performed using a combination of MATLAB and NASTRAN, has been selected for the purpose of this work. The updating procedure is regarded as parameter identification which aims to bring the numerical prediction to be as closely as possible to the measured natural frequencies and mode shapes data of the damaged structure in order to identify the damage parameters (characterised by the reductions in the Young's modulus of the weld patches to indicate the loss of material/stiffness at the damage region). 2011 Conference or Workshop Item PeerReviewed Ouyang, H and Abu Husain, Nurulakmar (2011) Detection of damage in welded structure using experimental modal data. In: 9th International Conference In Damage Assessment Of Structures (DAMAS 2011). http://iopscience.iop.org/article/10.1088/1742-6596/305/1/012120/meta |
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TJ Mechanical engineering and machinery Ouyang, H Abu Husain, Nurulakmar Detection of damage in welded structure using experimental modal data |
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A typical automotive structure could contain thousands of spot weld joints that contribute significantly to the vehicle's structural stiffness and dynamic characteristics. However, some of these joints may be imperfect or even absent during the manufacturing process and they are also highly susceptible to damage due to operational and environmental conditions during the vehicle lifetime. Therefore, early detection and estimation of damage are important so necessary actions can be taken to avoid further problems. Changes in physical parameters due to existence of damage in a structure often leads to alteration of vibration modes; thus demonstrating the dependency between the vibration characteristics and the physical properties of structures. A sensitivity-based model updating method, performed using a combination of MATLAB and NASTRAN, has been selected for the purpose of this work. The updating procedure is regarded as parameter identification which aims to bring the numerical prediction to be as closely as possible to the measured natural frequencies and mode shapes data of the damaged structure in order to identify the damage parameters (characterised by the reductions in the Young's modulus of the weld patches to indicate the loss of material/stiffness at the damage region). |
format |
Conference or Workshop Item |
author |
Ouyang, H Abu Husain, Nurulakmar |
author_facet |
Ouyang, H Abu Husain, Nurulakmar |
author_sort |
Ouyang, H |
title |
Detection of damage in welded structure using experimental modal data |
title_short |
Detection of damage in welded structure using experimental modal data |
title_full |
Detection of damage in welded structure using experimental modal data |
title_fullStr |
Detection of damage in welded structure using experimental modal data |
title_full_unstemmed |
Detection of damage in welded structure using experimental modal data |
title_sort |
detection of damage in welded structure using experimental modal data |
publishDate |
2011 |
url |
http://eprints.utm.my/id/eprint/45733/ http://iopscience.iop.org/article/10.1088/1742-6596/305/1/012120/meta |
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1643651827170803712 |
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13.209306 |