Quasi-static equivalent study on ice induced dynamic response of bow structure

Abstract

ObjectiveAs polar exploration develops, hull structure designs for ice routes are no longer limited to the traditional empirical formula method as more attention is paid to the actual ice load and structural response acting on the structure. The study of structural response calculation under ice load is crucial for the structural design of polar ships. MethodsFirst, the finite element method is used to numerically simulate the ice load cases of a polar navigation ship, such as crushed ice, floating ice and layered ice. Considering the influence of the material strain rate, the dynamic response of the structure under ice load is calculated. Second, based on the structural response equivalence, the static transformation of the dynamic response is completed, and the concept of the dynamic static transformation coefficient is proposed. Finally, the range of the dynamic static conversion coefficient under different ice load cases is obtained.ResultThe results show that the conversion coefficient of the dynamic-static equivalent conversion of the bow structure under different ice load cases is between 1.0 and 1.4.ConclusionThe quasi-static equivalent method of the ice-induced dynamic response of a bow structure is verified as reasonable and feasible.

Keywords

• ice load
• strain rate
• structural response
• dynamic static conversion coefficient