This study investigates a new dry tree semi-submersible platform composed of an upper floating body and a lower pontoon. Tendons are used to connect these two parts, which can rotate freely in roll and pitch in order to release the large wave bending moment. To study the motion and tendon performance of the complex multi-body system, this study uses a combination of numerical simulations and experiments to examine the new platform based on 3D multi-body potential theory. The numerical calculation results are in good agreement with the experimental results, and both results prove that the platform has excellent motion and tendon responses. In addition, the tendon lengths and lower pontoon weights are further explored, and their influences on the motion and tendon responses in the coupled multi-body system are obtained. It is helpful to increase the length of the tendon for improving the performance of the motion and tendon, but the effect of which can be ignored when the length is greater than 100 m. The issues concerning the excessive rotation angle and negative load of the tendon can be addressed by changing the weight ratio of the lower pontoon to upper floating body.

本研究调查了一种由上浮体和下浮筒组成的新型干树半潜式平台。肌腱用于连接这两个部分，可以在横摇和纵摇上自由旋转，以释放大波浪弯矩。为了研究复杂多体系统的运动和肌腱性能，本研究结合数值模拟和实验来检验基于 3D 多体势理论的新平台。数值计算结果与实验结果吻合较好，均证明平台具有良好的运动和肌腱响应。此外，进一步探索了腱长度和较低的浮筒重量，并获得了它们对耦合多体系统中运动和腱响应的影响。增加肌腱的长度对提高运动和肌腱的性能是有帮助的，但当长度大于100m时，其影响可以忽略不计。可以通过改变下浮筒与上浮体的重量比来解决有关腱过度旋转角度和负载荷的问题。