不规则波浪下SPAR平台参数纵摇的预测研究

发布时间：2018-04-10 23:30

本文选题：Spar平台 + 参数纵摇　；参考：《上海交通大学》2015年硕士论文

【摘要】：研究了深海Spar平台在不规则波浪条件下的参数纵摇现象。随着海洋油气开发不断向深海区域发展,浮式平台在勘探、开采和生产中得到越来越广泛的应用。参数振动是由于系统参数随时间变化而引起的振动现象。对于深海Spar平台,该现象通常是由于其在波浪中的垂荡运动引起的稳性半径变化所导致的,并表现为较大的纵摇或横摇响应。若发生参数纵摇现象,则可能会造成过大的平台运动,导致平台自身、相关设备的损坏,甚至威胁到工作人员的安全。因此,对参数纵摇现象进行预测和研究有助于避免不必要的人员伤亡和经济损失。众多研究人员在规则波的条件下对Spar平台的参数纵摇现象进行了研究。然而实际海况下,波浪是不规则的,且有实验模拟表明平台在不规则波下同样会发生参数纵摇,不考虑不规则波的参数纵摇分析可能存在危险。尽管不规则波浪条件下Spar平台的参数纵摇预测存在激励函数模拟和求解方法等众多挑战,仍有必要进一步对不规则波浪条件下的深海Spar平台参数纵摇性质进行系列分析,以保证平台在实际海况下的作业安全。本论文对现有的Spar平台参数不稳定性研究现状进行归纳总结,基于平台的垂荡-纵摇运动方程,并通过线性波浪理论,模拟了不规则波浪下Spar平台的垂荡运动响应,进而对由垂荡引起的参数纵摇现象主要进行了以下分析:1)推导出了适用于不规则波情况的Hill方程,实现了Spar平台在不规则波浪条件下参数纵摇的解析方法预测。应用解析方法绘制了多频波情况下的稳定性区域图,并与规则波的单频情况进行对比,提出了在不规则波情况下对参数纵摇进行分析的重要性。对不稳定区域的分布,以及阻尼系数等因素的影响作了分析,并对比了不同Spar平台壳体形状的稳定性区域图,得出以上因素对参数纵摇性质的影响和有利于避免参数纵摇的Spar平台形式。2)基于数值求解方法对Spar平台纵摇运动进行模拟。考虑非线性项因素,进行了更准确的预测。一方面对解析方法预测结果的安全性进行了验证,另一方面基于时历模拟的结果绘制了Spar平台最大纵摇角度与相关设计参数的等高图,直观地分析不同设计变量对参数纵摇性质和纵摇变化趋势的影响,得出了部分设计变量的简化对预测结果的影响,给出了发生参数纵摇情况下合理的设计变量调整方案。本论文实现了对不规则波情况下Spar平台参数纵摇的预测和分析,指出了有利于避免参数纵摇的Spar平台壳体形式,对平台的设计变量选取或调整方式提出了建议,有助于更好地进行Spar平台的设计,从而避免参数纵摇现象的发生,保证了平台和人员在作业中的安全。
[Abstract]:Study on the parameters of Spar platform in deep sea in irregular waves under the condition of pitching phenomenon. With the development of offshore oil and gas continue to deep-sea floating platform in regional development, exploration, widely used in mining and production. The parametric vibration is due to the phenomenon of vibration system with time-varying parameters caused. For deep sea Spar the platform, the phenomenon is usually caused by the change of the radius of stability in waves caused by the vertical movement, and the performance for larger pitching or rolling response. If the parameter of pitching phenomenon may be caused by excessive platform motion, leading to the platform itself, damage to equipment, even the threat to the safety of the staff. Therefore, the parameters of pitching phenomenon prediction and research helps to avoid unnecessary casualties and economic losses. Many researchers in the regular wave condition parameters on Spar platform longitudinal Shake phenomenon has been studied. However, the actual sea conditions, the wave is irregular, and the experimental results show that the platform in the irregular wave under the same will happen without considering the parameters of pitching, irregular wave parameter analysis of longitudinal wave could be dangerous. Although the longitudinal excitation function are predicted rolling parameters and simulation methods for solving such challenges the irregular wave conditions of Spar platform, it is necessary to further the irregular wave under the condition of deepwater Spar platform parameters pitching properties of series of analysis to ensure safe operation in real conditions. The parameters of the Spar platform of the existing platform instability research status are summarized, the platform of heave pitch based on the equation of rolling motion, and through the linear wave theory, the simulation of irregular waves under Spar platform heave motion response of heave caused by parameter pitching phenomenon mainly conducted under Analysis: 1) derived from the Hill equation for irregular waves, to achieve the Spar platform in the prediction of analytical method of irregular wave parameters under the condition of the pitch. Using analytic method draw the stability region under the condition of multi frequency wave, and compared with the single frequency wave, put forward in the the irregular wave conditions on parameters of pitch analysis. The importance of distribution on the unstable region, the influence factors and damping coefficient were analyzed, and compared the stability region of Fig. Spar platform shell shape, the influence factors on the parameters of pitch properties and to avoid.2 Spar platform parameters pitch) numerical method based on the Spar platform pitching motion simulation. Considering the nonlinear factors, a more accurate prediction of the safety. On the one hand, the prediction results of the analytical method was validated in another The results of simulation based on the calendar drawing platform of Spar maximum pitching angle and the relevant design parameters of the contour map, intuitive analysis of the influence of different design variables on the properties and parameters of pitching pitching trend, the effect of simplified part of design variables on the predicted results of design variables is given the parameter adjustment scheme of longitudinal shake reasonable under the circumstances. This paper realizes the prediction and analysis platform of Spar wave parameters under the condition of the pitch of the irregular, pointed out that the Spar platform is to avoid the shell form parameters of pitch, suggestions for the selection of design variables of platform or adjust the approach proposed is helpful for designing better Spar platform. In order to avoid the phenomenon of pitch parameters, ensure the platform and personnel in the operation safety.

【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U674.38

【共引文献】