共查询到17条相似文献，搜索用时 187 毫秒
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海上固定平台的冰激振动响应计算与分析 总被引：6，自引：0，他引：6
本文用强迫振动理论计算了辽东湾常见冰情挤压冰作用下ＪＺ２０—２—１采油平台和测冰平台的自振特性、位移、速度和加速度响应以及平台的应力响应，取得了一些有意义的结果，供平台设计和使用时参考。 相似文献
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渤海冬季油气生产危险冰情报警方法 总被引：1，自引：0，他引：1
目前，渤海中的油气田冬季生产都有可能遭受不同程度的冰灾威胁，建立渤海冬季油气生产危险冰情报警系统和防冰减灾的海冰管理方法是很有必要的。本文提出一套适用于渤海不同冰区以及不同型式油气开发工程的冬季油气生产危险冰情报警方法，其中包括渤海海冰生消过程中的监测，预报系统，对不同类型开发工程危险情报警标准的考虑以及海冰管理数据库和专家系统软件。本文是在辽东湾油气田海冰管理实验和研究基础上提出的。对渤海冬季生 相似文献
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渤海海域单柱三桩式海上风电结构冰激振动分析 总被引：2，自引：1，他引：1
针对渤海某区域以单柱三桩式结构为支撑的海上风电系统进行了冰激振动分析。首先模拟风电结构具有显著动力特性差异的主-从式结构特征,根据工程场址海域冰情条件,设置了合理的海冰分析工况,随后依据概化冰力函数确定作用于风电基础结构上的动冰力时程,开展全时域瞬态动力分析。通过对计算结果的详尽分析,选定表征冰与风电结构相互作用进程的综合控制因子Ic,建立基于综合控制因子的冰振事件区划及其出现概率的预判方法。相关方法将为渤海海域风电工程结构冰激振动问题的预判与评估提供参考。 相似文献
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针对渤海湾某风电场的海上固定式风机支撑结构,采用适用于大直径单桩结构的PSI曲线模拟桩土相互作用,并采用SACS软件建立支撑结构的动力分析模型。首先对支撑结构进行模态分析;其次考虑海冰结构的随机振动作用模式,根据适用于渤海湾的随机冰力谱构造随机冰载荷时程曲线,基于半耦合的时域方法,采用SACS软件对支撑结构进行冰激振动分析,输出塔筒顶部加速度、单桩基底剪力及倾覆力矩等响应参数的时程曲线和响应功率谱;最后针对冰厚、冰速和海冰强度等海冰参数对支撑结构的冰激振动进行敏感性分析。研究结果表明,在随机振动模式下,冰载荷及结构动力响应对冰厚和海冰强度较为敏感,在进行冰激振动分析时应合理确定冰厚和海冰强度等参数。 相似文献
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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 总被引：1，自引：0，他引：1
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。 相似文献
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自升式钻井平台在设计时通常不考虑冰荷载的作用,要实现冰区作业,首先需要对该类平台的抗冰能力进行准确评估。本文通过开展冰池试验,对自升式钻井平台冰载荷作用机理、结构冰激特性以及抗冰方法等进行研究。海洋结构受到的冰荷载大小以及结构响应值与冰厚密切相关,冰激振动机理与冰厚无关,探究不同冰速和冰厚下冰荷载及振动响应的时程曲线,可发现低冰速下结构展现出的准静态响应特征以及高冰速下的随机响应特征。冰激振动的发生是结构固有特性、冰速、冰厚、冰材料参数等因素共同影响的结果,其作用机理尤为复杂,本研究侧重于桁架式自升式平台冰区作业中结构冰激振动特性研究。 相似文献
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Duan Menglan Liu Chuntu Wang Weiming
Postgraduate China Classification Society Beijing Professor 《中国海洋工程》1996,(1)
The dynamic responses of offshore fixed platforms under ice loads are analysed in this paper. The responses calculated include the displacement and the hot spot stresses on the basis of a dynamic equation of ice-induced forced vibration for offshore structures. The results obtained can be cited and used for the design and operation of offshore fixed platforms against ice loading. 相似文献
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Offshore engineers and scientists face fascinating economical and technical challenges in designing offshore platforms for shallow water oil and gas fields in moderate ice conditions. Petroleum production systems in these ice-infested areas such as the Bohai Bay of China, Cook Inlet, Barent Sea, and Caspian Sea must be designed to accommodate the harsh environmental conditions, among which the first-year sea ice is one of the major design consideration. Extreme ice loads and ice-induced vibrations still remain an area of uncertainty in offshore platforms. This paper demonstrates the main technical aspects on the use of jackets in the Bohai Bay, with particular focus on ice loads and the failure modes of slender ice-resistant structures, which are the two key issues in design considerations. A design proposal and some considerations for economical ice-resistant structures for safe development in the cold region are also conceptually discussed. 相似文献
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Time- and Frequency-Domain Analysis of Ice-Induced Displacement Responses of Offshore Fixed Platforms 总被引：1，自引：0，他引：1
GAO Zhaojie DUAN Menglan Senior Engineer China Classification Society Beijing P. R. China. 《中国海洋工程》1998,(4)
—On the basis of ice-induced forced vibration model,ice-induced displacement responses ofoffshore fixed platforms are investigated in both time domain and frequency domain.The relationships ofice-induced displacement responses with ice breaking modes,ice acting directions and platform structuresare analyzed and determined.The results lead to an important conclusion obtained for the first time thatice breaking frequency and the natural frequency of the first mode of the platform are the two main fac-tors that dominate the degree of vibration.The present work provides a firm basis for both design and op-eration of fixed platforms against ice loading. 相似文献
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The problems of ice-induced vibration have been noticed and concerned since the 1960s, but it has not been well resolved. One reason is that the dynamic interaction between ice and structure is so complicated that practical ice force model has not been developed. The recent full-scale tests conducted on jacket platforms in the Bohai Sea presented that ice could cause intense vibrations which endanger the facilities on the deck and make discomfort for the crew. In this paper, the strategy of mitigation of ice-induced offshore structure vibration is discussed. Based on field observations and understanding of the interaction between ice and structure, the absorption mitigation method to suppress ice-induced vibration is presented. The numerical simulations were conducted for a simplified model of platform attached with a Tuned Mass Danlper （TMD） under ice force function and ice force time history. The simulation results show that TMD can fa- vorably reduce ice-induced vibrations, therefore, it can be considered to be an alternative approach to utilize. Finally, the application possibilities of utilizing TMDs on other miniature offshore structures in ice-covered areas of marginal oil fields are discussed. 相似文献