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发表时间：2022-07-23

发表刊物：Chinese Journal of Computational Mechanics

卷号：38

期号：3

页面范围：337-345

ISSN号：1007-4708

关键字："dynamic ice load; similarity law; model test; finite element method; interaction coefficient"

摘要：The similarity laws play a very important role in model tests.Although the current research on static ice force model tests is relatively comprehensive,there is still no fully applicable dynamic ice force similarity law as the basis of dynamic ice force model tests.This paper proposes two dynamic ice force similarity laws based on the joint similarity criterion of elasticity similarity and Cauchy similarity for the dynamic ice force model test in ice-induced structural vibration.The interaction coefficient that can reflect the interaction between ice and structure is established and improved.Taking the NREL5MW monopile offshore wind turbine as an example,two similar relationships between the prototype and the model of the offshore wind turbines under the action of sea ice are given by considering whether the bending stiffness of the section is similar.Using the ANSYS/LS-DYNA finite element method,the prototype and model wind turbines are numerically simulated and the dynamic response analysis of the structure under sea ice is carried out.According to the calculation results,the two proposed dynamic ice force similarity laws are verified based on the ice-wind turbines interaction with different ice thicknesses, and the two similarity laws are compared.The results show that although the pipe wall thickness scale can be optimized based on the second similarity law which considers similar bending stiffness,and can provide convenience for model making,the simulation accuracy is not as good as the first law.The research results can provide a theoretical reference for the study of ice force model tests in cold seas.

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