Abstract
The importance of hydroelasticity analysis of large and flexible container ships of today has been pointed out for structure design. Because of the increases of the size of container ships, whipping phenomena has been one of the important design considerations. This paper introduced a 3D nonlinear hydroelasticity theory which utilizes a 3-D Green function method and a 2-D momentum model coupled in time domain. A model system for measurement of nonlinear wave loads which is composed of a backbone and segmented container ship model has been already established, and applied to a series of large ship models, in which natural frequency of vertical bending is matched using a beam. A series of model tests have been carried out for selected cases of whipping in irregular waves. The computational results were compared with those of a model test of a 10,000-TEU containership. The Verifications and validations between model tests result and theoretical calculation have been carried out. The asymmetry of wave elevation, vertical ship motion and vertical sectional loads responses are mainly discussed, they are observed and calculated in irregular wave conditions, and the experimental results accord with simulated results, basing on which the design vertical bending moment at midship can be obtained by using the nonlinear short-term and long-term analysis, and the comparison between direct calculation and classification society rules is carried out, which has much in common.
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Li, X., Zhang, K., Ren, H., Chen, S. (2021). Nonlinear Wave Loads’ Prediction on Ultra Large Containerships. In: Zheng, L., Sun, C., Goh, KL. (eds) Proceedings of MEACM 2020. MEACM 2020. Mechanisms and Machine Science, vol 99. Springer, Cham. https://doi.org/10.1007/978-3-030-67958-3_13
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DOI: https://doi.org/10.1007/978-3-030-67958-3_13
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