时变风中Spar平台系泊系统的耦合动力分析  

Dynamic coupling analysis of mooring systems for a Spar platform in time-varying wind

作　　者：李辉[1] 单鹏昊 任慧龙 王钰涵[1] 

机构地区：[1]哈尔滨工程大学船舶与海洋工程力学研究所,黑龙江哈尔滨150001

出　　处：《华中科技大学学报（自然科学版）》2013年第2期36-40,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点基础研究发展计划资助项目(2011CB013703)

摘　　要：在中国南海东部百年一遇的台风海况下,考虑不同风载荷的计算方式,对某Classic-Spar平台及其系泊缆索的动力响应作了时域非线性数值模拟.首先将平台频域水动力结果变换到时域;然后运用非线性有限元方法计算张紧式系泊缆索的动张力特性;最后运用四阶龙格-库塔法在时间域内计算平台及其系泊系统的非线性耦合运动方程.分析结果表明:在时变风的作用下,平台运动不仅会偏离平衡位置,而且由于时变风的特征频率通常在Spar平台水平面运动的自振频率附近,因此相对于稳态风,考虑时变风的影响将会激起平台大幅度的水平面慢漂运动响应,从而诱发很大的系泊张力.In consideration of the typhoon rarely seen in the east area on South China sea, a nonlinear time-domain numerical simulation for a Classic-Spar platform system was performed. The frequencydomain hydrodynamic results were transferred to time-domain, and the dynamic tension of mooring ropes was calculated by geometric nonlinear finite element method. Then, the fourth order RungeKutta method was taken to calculate the time-domain nonlinear coupled equation of motion. Results show that compared with the steady-state wind, the characteristic frequency of the time-varying wind is usually more close to the resonance frequency of the Spar platform horizontal movement. The condition of considering the time-varying wind will arouse even larger horizontal slow-frequency drift motion response of the Spar platform, and mooring tension as well.

关 键 词：SPAR平台 几何非线性 系泊系统 耦合动力响应 时变风 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]