Eigenfrequecy-based damage identification method for non-destructive testing based on topology optimization |
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Authors: | T Nishizu M Kitamura |
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Affiliation: | 1. Department of Transportation and Environmental Systems, Graduate School of Engineering, Hiroshima University, Hiroshima, Japan;2. Division of Mechanical Systems and Applied Mechanics, Institute of Engineering, Hiroshima University, Hiroshima, Japan |
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Abstract: | Non-destructive testing (NDT) detects damage according to a difference in a physical phenomenon between a normal structure and damaged structure. As a solution avoiding human errors in NDT, a numerical method based on a dynamical numerical analysis model and a structural optimization algorithm was proposed. This method automatically derives a structure with a response that is equal to that of a damaged structure through an optimization procedure. Among structural optimization methods, topology optimization can optimize the structure fundamentally by changing the topology and not just the shape of a structure. Thus, topology optimization is employed together with eigenfrequency analysis, which is the most fundamental methodology of NDT. The proposed method derives a structure that has the same eigenfrequencies as a damaged structure employing topology optimization. The shape and location of damage can be identified through the optimal shape obtained. |
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Keywords: | Topology optimization eigenfrequency analysis non-destructive testing sensitivity analysis |
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