基于稳定性理论的张力腿平台横摇固有周期分析

发布时间：2018-07-10 09:10

本文选题：张力腿平台 + 横摇　；参考：《船舶力学》2017年07期

【摘要】：文章以稳定性理论为基础提出了一种张力腿平台横摇固有周期计算模型,分析了横摇临界角对平台横摇稳定性的影响,并将其应用于分析平台设计参数对横摇固有周期的影响。提出在一个横摇周期里,最后稳定横摇临界角对应的时间历程为1/4横摇固有周期这一假设,基于此假设,编制计算机计算程序,计算横摇运动中每一个横摇角,判断其稳定性,找出一个横摇周期内最后稳定横摇临界角对应的时间历程,求解横摇运动固有周期。考虑两种横摇阻尼情况,计算不同初始横摇角、横摇下沉位移、张力腱长度、平台重量和横摇阻尼的横摇固有周期,论证了平台设计参数对横摇固有周期的影响。该计算模型克服了从结构角度计算固有周期工作量大、计算周期长、计算结果不可靠的弱点,使横摇固有周期计算简单、有效。通过与不考虑横摇阻尼的情况对比,分析了横摇阻尼对横摇固有周期的影响。可以快速计算处于设计阶段或者已服役张力腿平台横摇固有周期。结合一型设计中的张力腿平台,应用文中提出的横摇固有周期计算模型对该平台进行了横摇固有周期的计算,并且分析了平台参数对横摇固有周期的影响。结果表明该方法可以对张力腿平台横摇固有周期进行快速计算。并可推广应用于其它海上结构物的横摇固有周期计算。
[Abstract]:Based on the stability theory, this paper presents a calculation model of the natural rolling period of the tension leg platform, analyzes the influence of the critical angle of rolling on the rolling stability of the platform, and applies it to the analysis of the influence of the design parameters of the platform on the inherent period of the rolling. In a rolling period, the assumption that the time course corresponding to the final stable critical angle of roll is the inherent period of 1 / 4 roll is proposed. Based on this assumption, a computer program is compiled to calculate each roll angle in the rolling motion and to judge its stability. The time course corresponding to the critical angle of the final stable roll in a rolling period is found, and the inherent period of the rolling motion is solved. Considering the two kinds of rolling damping, the rolling inherent period of different initial rolling angle, rolling subsidence displacement, tensioning tendon length, platform weight and rolling damping is calculated, and the influence of platform design parameters on the rolling inherent period is demonstrated. The calculation model overcomes the disadvantages of large workload, long calculation period and unreliable calculation result, which makes the calculation of natural period of rolling is simple and effective. The influence of rolling damping on the natural period of rolling is analyzed by comparing with the case without considering roll damping. The natural rolling period of the platform in the design stage or in service can be calculated quickly. Combined with the tension leg platform in the design of a type of platform, the natural period of rolling is calculated by using the model proposed in this paper, and the influence of platform parameters on the natural period of rolling is analyzed. The results show that this method can be used to calculate the natural rolling period of tension leg platform quickly. It can be used to calculate the natural rolling period of other offshore structures.
【作者单位】：大连理工大学工业装备与结构分析国家重点实验室运载工程与力学学部船舶工程学院;
【分类号】：P751

【相似文献】