Abstract
Crack identification in structures by detecting changes in their dynamic behavior has been studied in the past, and various methods have been developed, enabling the calculation of crack location and depth along a beam. Most of these methods utilize the frequency changes caused by the crack. The clamp rigidity of a beam tends to soften as time goes on, and this unexpectedly brings large errors in crack identification. This chapter examines the problem of crack identification in a beam when clamp rigidity is unknown. The identification method is based on the genetic algorithm (GA). Finally, the proposed method is verified by numerical simulation.
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