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论文类型：期刊论文

发表时间：2015-06-01

发表刊物：APPLIED OCEAN RESEARCH

收录刊物：SCIE、EI、Scopus

卷号：51

页面范围：129-137

ISSN号：0141-1187

关键字：Crashworthy device; Optimization design; Dynamic effect; Monopile foundation; Offshore wind turbine; Ship collision

摘要：The risk of offshore wind turbines collision with ships is on the rise during the service period with the increase of offshore wind farms and ship routings. In order to minimize the damage of offshore wind turbines caused by ship impact, a crashworthy device, which contains a rubber blanket and outer steel shell, is proposed. The rubber hardness and the rubber and steel shell thicknesses of the crashworthy device are optimized by comparing the collision-force and nacelle acceleration using LS-DYNA explicit code. The main reason for lessening the maximum collision-force and nacelle acceleration is that the rubber blanket could absorb a portion of ship energy by using its own structure deformation. Therefore, an optimal crashworthy device for the monopile offshore wind turbine, meeting the weight constraint, is suggested and implemented in various impact scenarios. The obvious effects of crashworthy devices are a decrease of the maximum collision-force and nacelle acceleration, especially for ships with smaller initial kinetic energy. The damage area of plastic strain for foundations is reduced to zero when crashworthy devices are used in the analysis scenarios. This paper may be useful in anti-impact design of offshore wind turbines. (C) 2015 Elsevier Ltd. All rights reserved.