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Study on Method of Crack Detection of L-beams with Coupled Vibration  

Son, In-Soo (동의대학교 기계공학과)
Cho, Jeong-Rae (한국폴리텍 VI대학 달성캠퍼스 자동차과)
Ahn, Sung-Jin (대한상공회의소 부산인력개발원)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.9, no.6, 2010 , pp. 78-86 More about this Journal
Abstract
This paper aims to investigate the natural frequency of a cracked cantilever L-beams with a coupled bending and torsional vibrations. In addition, a theoretical method for detection of the crack position and size in a cantilever L-beams is presented based on natural frequencies. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by using extended Hamilton's Principle. The dynamic transfer matrix method is used for calculation of a exact natural frequencies of L-beams. In order to detect the crack of L-beams, the effect of spring coefficients for bending moment and torsional force is included. In this study, the differences between the actual data and predicted positions and sizes of crack are less than 0.5% and 6.7% respectively.
Keywords
L-beams; Natural Frequency; Crack Detection; Open Crack; Coupled Vibration;
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Times Cited By KSCI : 1  (Citation Analysis)
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