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On prediction of crack in different orientations in pipe using frequency based approach

DSpace at IIT Bombay

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Title On prediction of crack in different orientations in pipe using frequency based approach
 
Creator NANIWADEKAR, MR
NAIK, SS
MAITI, SK
 
Subject damage detection
natural frequencies
wavelet transform
cantilever beam
neural-network
element-method
vibration
identification
location
fluid
change in transverse natural frequency of pipe due to crack
crack detection in empty pipes
ndt of cracks in pipes
crack in empty pipe with different orientation
robustness analysis
 
Description A technique based on measurement of change in natural frequencies and modeling of crack by rotational spring is employed to detect a crack with straight front in different orientations in a section of straight horizontal steel hollow pipe (outer diameter 0.0378 m and inner diameter 0.0278 m). Crack orientations in the range 0-60 degrees with the vertical have been examined and sizes/depths in the range 1-4 mm through the wall of thickness 5 mm have been studied. Variation of rotational spring stiffness with crack size and orientation has been obtained experimentally by deflection and vibration methods. The spring stiffness reduces as expected, with an increase in crack size; it increases with an increase in the crack orientation angle. The crack location has been predicted with a maximum error of 7.29%. The sensitivity of the method for prediction of crack location on variations in experimental data has been examined by changing the difference between the frequencies of pipes with and without crack by +/- 10%. The method is found to be very robust; the maximum variation in location is 2.68%, which is much less than the change in frequency difference introduced. (c) 2007
 
Publisher ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
 
Date 2011-07-12T20:31:07Z
2011-12-26T13:02:51Z
2011-12-27T05:50:06Z
2011-07-12T20:31:07Z
2011-12-26T13:02:51Z
2011-12-27T05:50:06Z
2008
 
Type Article
 
Identifier MECHANICAL SYSTEMS AND SIGNAL PROCESSING, 22(3), 693-708
0888-3270
http://dx.doi.org/10.1016/j.ymssp.2007.09.007
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3583
http://hdl.handle.net/10054/3583
 
Language en