Optimum Design of a Passive Suspension System of a Semisubmersible for Pitching Reduction
Optimum Design of a Passive Suspension System of a Semisubmersible for Pitching Reduction
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DOI：
10.1115/1.4033948
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发表时间：
2016-12
影响因子：
1.7
通讯作者：
Hongzhong Zhu;Changhong Hu;Yingyi Liu
中科院分区：
文献类型：
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作者：
Hongzhong Zhu;Changhong Hu;Yingyi Liu
随着海洋能源开发的不断深入，人们期望开发出可靠的、运动极小的半潜式平台。特别地，在旋转的海上风力涡轮机系统中，要求最大俯仰幅度小于几度。为了减小波浪引起的纵摇运动，提出了一种新型悬挂式半潜器及其悬挂系数的设计方法。在实际应用中，将附加式波浪能消能装置安装在浮式平台上，如波浪-风能联合转换系统，可视为悬浮系统。在本研究中，首先描述了概念性半潜式平台。然后，对半潜式平台的水动力载荷进行线性化，使整个系统由状态空间模型表示。将悬架设计问题转化为求解一个带约束的H_∞优化问题，即反馈系统的最优控制器设计问题。最后通过数值算例验证了设计的有效性。结果表明，所设计的悬挂系统可以显著减小半潜式平台的纵摇运动。
With the development of ocean energy exploration, reliable semi-submersible platforms with very small motion are ex-pected to develop. Especially, in a floating offshore wind turbine system, the maximum pitching amplitude is required to be less than a few degrees. To reduce wave-induced pitch motion, a new type semi-submersible with suspensions and a design method of the suspension coefficients are presented. In practical case, an add-on wave energy dissipation device mounted on a floating platform, such as the combined wave-wind energy converter system, could be regarded as the suspension system. In this study, firstly, the conceptual semisubmersible is described. Then, the hydrodynamic loads to the semi-submersible are linearized so that the whole system is expressed by a state-space model. The suspension design problem is transformed into solving a constrained H ¥ optimization problem, which after all is the optimal controller design of a feedback system. Finally, numerical examples are performed to verify the effectiveness of the design. The results illustrate that the pitch motion of the semi-submersible can be remarkably reduced by the designed suspensions.