文章摘要
王琳琳,杨文东,杜亚震,柳天华,王文华,黄一.基于动力定位系统的沙漏型浮体多自由度耦合运动分析[J].,2018,58(5):487-493
基于动力定位系统的沙漏型浮体多自由度耦合运动分析
Coupling analysis on multi-degrees of freedom motions of sandglass-type floating body based on dynamic positioning system
  
DOI:10.7511/dllgxb201805007
中文关键词: 沙漏型浮体  动力定位系统  耦合作用  附加纵摇力矩  频率响应传递函数
英文关键词: sandglass-type floating body  dynamic positioning system  coupling effect  additional pitch moment  frequency-domain transfer function
基金项目:工信部海洋工程装备科研项目(2014500);国家自然科学基金资助项目(51679034);辽宁省自然科学基金资助项目(2015020157);大连理工大学科研创新团队专题项目(DUT16TD11).
作者单位
王琳琳,杨文东,杜亚震,柳天华,王文华,黄一  
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中文摘要:
      具有水动力性能优势的新概念沙漏型浮体,由于具有水线面面积和初稳性高较小等特性,其纵摇运动的固有频率与推进器纵向控制力的频率接近,导致浮体水平面和垂直面的运动产生耦合作用,从而引起较大的纵荡和纵摇运动响应.针对此问题,采用基于势流理论的边界元方法计算沙漏型浮体的波浪荷载和水动力参数.结合实际布置推进器产生的控制荷载,建立沙漏型浮体纵荡-垂荡-纵摇耦合运动方程.通过数值模拟和频率响应传递函数,重点讨论沙漏型浮体多自由度运动的相互影响以及推进器附加纵摇力矩引发的问题.最后,将纵摇阻尼和惯性力项加入纵荡控制力中,显著降低了纵荡和纵摇运动响应,很好地满足了定位精度的要求.
英文摘要:
      For the new concept sandglass-type floating body with hydrodynamic performance advantage, due to its small waterplane area and metacentric height, the natural frequency of pitch motion is close to the frequency of longitudinal control of the thruster. Thus, large motion responses of surge and pitch may be induced by the coupling effect in both horizontal and vertical planes. In view of the problem, the wave loads and hydrodynamic parameters of sandglass-type floating body are calculated with the boundary element method (BEM) based on wave potential theory. By considering the control loads taking into account the actual position of the thrusters, the coupling equations of surge, heave and pitch motions of sandglass-type floating body are established. Through numerical simulations and frequency-domain transfer functions, the interactive effects of multi-degrees of freedom motions and the additional pitch moment induced by the thrusters are mainly discussed. Finally, a surge control action considering pitch damping and pitch inertia effect is adopted to directly weaken the obvious surge and pitch motion responses to meet the positioning accuracy requirement well.
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