绷紧式系泊系统含损伤系缆的力学特性及动力响应研究

发布时间：2018-09-10 15:52

【摘要】：系泊系统设计和分析是深海油气开发平台的关键问题,对于采用合成纤维系缆的绷紧式系泊系统,由于材料属性和安装、使用等因素可能造成缆绳不同程度的损伤,因此有必要研究损伤缆在复杂海况下的非线性动力特性,尤其是动刚度演变规律。本文介绍了复杂海洋环境条件下合成纤维系缆的损伤情况及动刚度特性,总结和评述了针对这些特性开展的国内外相关研究,也对今后需要继续深化的研究进行了展望,以期为国内在此方向开展的模型实验研究提供重要参考。采用国内首台合成纤维系缆循环加载实验系统,对6mm和8mm的聚酯(Polyester)缆绳试样及高强聚乙烯(HMPE)缆绳试样进行实验研究。引入损伤度指标衡量缆绳的损伤程度,通过剪切股纱减小缆绳的有效承载面积以制造损伤,分别考察了损伤度、平均载荷、应变幅值和循环周次对缆绳动刚度的影响。通过量纲分析得到损伤缆动刚度相似准则,在此基础上分析实验数据获得考虑各主要影响因素的动刚度演变经验公式,并对经验公式计算所得动刚度值与实验数据比较进行误差分析,验证了公式的准确性。这些工作为今后更为复杂的全尺寸损伤缆绳的动刚度实验研究奠定了基础。本文针对缆绳出现损伤情况的绷紧式系泊系统,分别采用完好缆绳与迎风向、背风向出现损伤缆绳情况进行动力响应计算并对比其全动态时域计算结果,以说明不同损伤模式对系泊系统动力响应的影响程度。将三种系泊缆绳状态的全动态计算结果进行比较和分析,以期为绷紧式系泊系统应用于国内实际工程提供参考。
[Abstract]:The design and analysis of mooring system is the key problem of deep-sea oil and gas development platform. For the tension-type mooring system with synthetic fiber cable, the cable may be damaged to varying degrees due to material properties and installation, etc. Therefore, it is necessary to study the nonlinear dynamic characteristics of damaged cables under complex sea conditions, especially the evolution of dynamic stiffness. In this paper, the damage and dynamic stiffness characteristics of synthetic fiber cable under complex marine environment are introduced, and the related research on these characteristics at home and abroad are summarized and reviewed, and the further research in the future is prospected. In order to provide an important reference for the domestic model experimental research in this direction. The test system for cyclic loading of synthetic fiber cable in China was used to study the polyester (Polyester) cable specimens of 6mm and 8mm and the high strength polyethylene (HMPE) cable specimens. The damage degree was measured by introducing the damage degree index, and the damage was made by reducing the effective bearing area of the rope by shearing the yarn. The effects of damage degree, average load, strain amplitude and cycle on the dynamic stiffness of the cable were investigated respectively. The similarity criterion of dynamic stiffness of damaged cable is obtained by dimensional analysis. Based on the analysis of experimental data, the empirical formula of dynamic stiffness evolution considering the main factors is obtained. The accuracy of the formula is verified by the error analysis of the dynamic stiffness calculated by the empirical formula and the experimental data. These work will lay a foundation for the more complicated experimental research on the dynamic stiffness of full-scale damaged cable in the future. In this paper, the dynamic response of the taut mooring system in which the cable is damaged is calculated by using the intact cable, the upwind direction and the leeward direction, respectively, and the dynamic time domain calculation results are compared. The effect of different damage modes on the dynamic response of mooring system is illustrated. The full dynamic calculation results of three kinds of mooring cable states are compared and analyzed in order to provide a reference for the application of the taut mooring system to the domestic practical projects.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U653.2

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