锥体导管架海洋平台冰激振动的DEM-FEM耦合分析及高性能算法

王帅霖; 季顺迎

doi:10.3969/j.issn.0253-4193.2017.12.010

锥体导管架海洋平台冰激振动的DEM-FEM耦合分析及高性能算法

doi: 10.3969/j.issn.0253-4193.2017.12.010

大连理工大学工业装备结构分析国家重点实验室, 辽宁大连 116023

基金项目: 国家重点研发计划（2016YCF1401505，2016YFC1402705，2016YFC1402706）；国家自然科学基金项目（41576179，51639004）。

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出版历程
- 收稿日期: 2016-12-30
- 修回日期: 2017-05-31

Ice induced vibration of conical platform based on coupled DEM-FEM model with high efficiency algorithm

State Key Laboratory of Structure Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116023, China

摘要

摘要: 在寒区海域，冰荷载是影响海洋平台安全运行的主要环境荷载之一，由其引起的冰激振动给平台结构及其上部设备带来了严重危害。为分析不同冰况下平台的振动响应，本文建立了导管架海洋平台冰激振动的离散元（DEM）-有限元（FEM）耦合模型。采用具有黏接-破碎性能的等粒径球体离散单元对海冰的破碎特性进行模拟，通过由梁单元构建的海洋平台有限元模型获得结构的振动响应。在离散元与有限元的接触区域中实现了两个模型间计算参数的传递。为提高该耦合模型的计算效率和规模，发展了基于动力子结构方法的DEM-FEM耦合模型。为验证该耦合模型的有效性和可行性，将不同冰况下得到的冰荷载与ISO19906和JTS 144-1-2010标准进行了对比。结果表明，计算得到的冰荷载与标准相近，且冰厚与冰荷载呈二次非线性关系。同时，从冰速和冰厚两方面对比了渤海四桩腿JZ20-2 MUQ锥体导管架平台冰激振动加速度的数值结果和现场实测数据，发现冰速与振动加速度呈线性关系，冰厚与振动加速度呈二次非线性关系，并且振动加速度与冰速和冰厚平方的乘积呈线性关系。
- 冰荷载 /
- 冰激振动 /
- 锥体导管架平台 /
- DEM-FEM耦合模型 /
- 动力子结构
Abstract: In cold regions, the vibrations of offshore platforms induced by sea ice can be harmful for not only the routine production but also the serviceability and safety of platforms. In this study, a coupled discrete element method (DEM) and finite element method (FEM) is developed to analyze the sea ice-conical jacket platform interaction and ice induced vibrations of the platform. The DEM with bonding-breaking effect between bonded spherical elements is adopted to simulate the breakage of ice cover and the FEM is applied to model the ice-induced vibrations of jacket platform with the beam element. The transmissions of the mechanical variables at the interface between DEM and FEM are achieved in this paper. In additionally, to improve the computational efficiency and scale of the coupled model, the coupled model based on the dynamic sub-structure method is adopted here. In order to verify the effectiveness of the proposed method, ISO19906 and JTS 144-1-2010 standards under various ice velocities and thicknesses are compared with the simulated ice load. The simulated ice load is in good conformance with the standard. Meanwhile, the simulation accelerations obtained by the proposed method are compared with observation data of the four-pile conical platform (JZ20-2 MUQ), which show the high consistency. In addition, the results also indicate that the vibration acceleration of the platform is linearly related to ice velocity, quadratic nonlinearity to ice thickness, and linearly related to the product of the ice velocity and ice thickness squared.
- ice force /
- ice-induced vibration /
- conical offshore platform /
- coupled DEM-FEM /
- dynamic sub-structure method

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