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A platform for research: civil engineering, architecture and urbanism
Warship damage identification using mode curvature shapes method
Abstract Ship damage identification is very important for damage control, personal and property safety, and strategic decision. In this paper, a novel method for hull girder damage identification is proposed based on mode curvature shapes(MCS). A 4000-ton ship, which is simplified as a hull girder, is taken as the research object to validate this method through six damage scenarios represented by different stiffness loss. The natural frequencies and mode shapes are obtained by the finite element method, and then the MCS was derived by a central difference approximation. An improved damage indicator(DI) is defined to locate the damage. The effects of noise and FE modeling uncertainty on DI are further discussed. The damage extent under different damage scenarios is derived by the perturbation theory and MCS differences are used for damage quantitation. Results show that DI has significant damage localization ability in single or multiple damage cases. However, this MCS-based damage quantitation method derived by perturbation theory has a large error when quantifying tiny damage. The research results of this paper can provide a new method and idea for hull girder damage identification and help check the safety of the ship.
Warship damage identification using mode curvature shapes method
Abstract Ship damage identification is very important for damage control, personal and property safety, and strategic decision. In this paper, a novel method for hull girder damage identification is proposed based on mode curvature shapes(MCS). A 4000-ton ship, which is simplified as a hull girder, is taken as the research object to validate this method through six damage scenarios represented by different stiffness loss. The natural frequencies and mode shapes are obtained by the finite element method, and then the MCS was derived by a central difference approximation. An improved damage indicator(DI) is defined to locate the damage. The effects of noise and FE modeling uncertainty on DI are further discussed. The damage extent under different damage scenarios is derived by the perturbation theory and MCS differences are used for damage quantitation. Results show that DI has significant damage localization ability in single or multiple damage cases. However, this MCS-based damage quantitation method derived by perturbation theory has a large error when quantifying tiny damage. The research results of this paper can provide a new method and idea for hull girder damage identification and help check the safety of the ship.
Warship damage identification using mode curvature shapes method
Zhang, Yin (author) / Guo, Jun (author) / Xie, Yaoguo (author) / Xu, Jiang (author)
Applied Ocean Research ; 129
2022-10-25
Article (Journal)
Electronic Resource
English
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