Publisher : The Korean Society for Noise and Vibration Engineering
DOI : 10.5050/KSNVE.2015.25.11.764
Title & Authors
Fault Detection Method of Pipe-type Cantilever Beam with a Tip Mass Lee, Jong Won;
A crack identification method using an equivalent bending stiffness and natural frequency for cracked beam is presented. Modal properties of cantilever beam with a tip mass is identified by applying the boundary conditions to a general solution. An equivalent bending stiffness for cracked beam based on an energy method is used to identify natural frequencies of cantilever thin-walled pipe with a tip mass, which has a through-the-thickness crack, subjected to bending. The identified natural frequencies of the cracked beam are used in constructing training patterns of neural networks. Then crack location and size are identified using a committee of the neural networks. Crack detection was carried out for an example beam using the proposed method, and the identified crack locations and sizes agree reasonably well with the exact values.
Crack Identification;Tip Mass;Natural Frequency;
Dilena, M., Dell'Oste, M. F. and Morassi, A., 2011, Detecting Cracks in Pipes Filled with Fluid from Changes in Natural Frequencies, Mechanical Systems and Signal Processing, Vol. 25, No. 8, pp. 3186-3197.
Wang, Y. M., Chen, X. F. and Heb, Z. J., 2011, Daubechies Wavelet Finite Element Method and Genetic Algorithm for Detection of Pipe Crack, Nondestructive Testing and Evaluation, Vol. 26, No. 1, pp. 87-99.
Ye, J., He, Y., Chen, X. et al., 2010, Pipe Crack Identification Based on Finite Element Method of Second Generation Wavelets, Mechanical Systems and Signal Processing, Vol. 24, No. 2, pp. 379-393.
Naniwadekar, M. R., Naik, S. S. and Maiti, S. K., 2008, On Prediction of Crack in Different Orientations in Pipe Using Frequency Based Approach, Mechanical Systems and Signal Processing, Vol. 22, No. 3, pp. 693-708.
Murigendrappa, S. M., Maiti, S. K. and Srirangarajan, H. R., 2004, Frequency-based Experimental and Theoretical Identification of Multiple Cracks in Straight Pipes Filled with Fluid, NDT&E International, Vol. 37, No. 6, pp. 431-438.
Murigendrappa, S. M., Maiti, S. K. and Srirangarajan, H. R., 2004, Experimental and Theoretical Study on Crack Detection in Pipes Filled with Fluid, Journal of Sound and Vibration, Vol. 270, No. 4-5, pp. 1013-1032.
Yang, X. F., Swamidas, A. S. J. and Seshadri, R., 2001, Crack Identification in Vibrating Beams Using the Energy Method, Journal of Sound and Vibration, Vol. 244, No. 2, pp. 339-357.
Huh, Y. C., Kim, J. K. and Park, S. H., 2007, A Study about the Damage Model of a Cantilever Beam with Open Crack Generated in Whole Breadth of the Beam, Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 17, No. 10, pp. 936-945.
Lee, J. W., Kim, S. R. and Huh, Y. C., 2014, Pipe Crack Identification Based on the Energy Method and Committee of Neural Networks, International Journal of Steel Structures, Vol. 14, No. 2, pp. 345-354.
Gorman, D. J., 1975, Free Vibration Analysis of Beams and Shafts, John Wiley & Sons, New York.