期刊
JOURNAL OF VIBRATION AND CONTROL
卷 27, 期 19-20, 页码 2345-2353出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1077546320960312
关键词
Nonlinear vibrations; cracked beam; breathing behavior; structural health monitoring; damping change; crack detection
Identifying damping changes in a cracked beam can enhance the accuracy of the nonlinear crack identification method. Experimental results demonstrate that increasing crack depth and excitation level enlarge the damping coefficient in the vibrating beam, highlighting the significant impact of crack depth and excitation level on the structural damping coefficient.
The attempts to identify damping changes in a cracked beam can improve the accuracy of the nonlinear crack identification method. For the purpose of this aim, a parametric nonlinear equation of motion is obtained using the Euler-Bernoulli beam theory and parametric nonlinear breathing crack assumptions. Several experiments were conducted to identify the effect of breathing cracks on changing the damping value in nonlinear vibrations of a cracked beam. Experimental tests have revealed that increasing the crack depth and the level of excitation enlarges the damping coefficient in a vibrating beam. For this reason, the effects of the excitation force and crack depth on the structural damping coefficient are investigated. The obtained results indicated that considering the nonlinear response of a cracked beam and measuring the value of the damping changes can significantly improve the accuracy of the nonlinear crack identification method.
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