Damage detection based on the natural frequency shifting of a clamped rectangular plate model
Damage detection of any structure becomes the main concern in a failure analysis. Early failure detection is very important as it can prevent any catastrophic failure by replacing or repairing the damage part at early stage. One of the non-destructive methods of damage detection is using frequenc...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Institute of Physics Publishing (UK)
2015
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/46312/ http://irep.iium.edu.my/46312/ http://irep.iium.edu.my/46312/ http://irep.iium.edu.my/46312/1/Hilmy-Journal2015.pdf http://irep.iium.edu.my/46312/3/46312_Damage%20detection%20based%20on%20the%20natural%20frequency%20shifting_Scopus.pdf |
| Summary: | Damage detection of any structure becomes the main concern in a failure analysis.
Early failure detection is very important as it can prevent any catastrophic failure by replacing
or repairing the damage part at early stage. One of the non-destructive methods of damage
detection is using frequency based vibration analysis. Identification and comparison of a set of
natural frequencies before and after damage is the main concern of this research. A rectangular
plate clamped at all edges represented an initial undamaged structure. Based on Kachanov’s
definition, damage existence in a structure is introduced in the presence of some circular voids.
The voids are generated randomly at different level of damage value. To obtain the Natural
Frequencies, a Finite Element Model (FEM) of a clamped plate with the updated value of
Young’s Modulus is analyzed. From the FEM analysis result, it is found that the Natural
Frequencies are shifted as the void existence increase. Using curve fitting, the model of Natural
Frequency shifting as a function of damage evolution has been generated. It is found that the
shifting of the Natural Frequency is greater at higher frequency value as indicated by the higher
absolute gradient. |
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