A study on the dynamic response of a semi-submersible floating offshore wind turbine system Part 1 : A water tank test
A study on the dynamic response of a semi-submersible floating offshore wind turbine system Part 1 : A water tank test
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2008
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提出了一种新的半潜式浮式结构，在其上将安装三个风力机塔架。本文介绍了水箱中1/150比例尺刚性模型试验的动力特性。在本研究的第二部分，进行了静水中的自由振动试验，以获得验证数值模型和模拟垂直运动的阻尼比所需的固有周期。为了评价浮子的动态特性，进行了波高为2、4、8 cm、周期为0.6~3.0的规则波试验，并用光学系统测量了浮子的响应。在远离自然周期的周期范围内，观测到的涌浪随波高呈线性变化。然而，波高归一化的涌浪在自然周期附近出现峰值，并随着波高的增加而显著减小。为了研究风力机对浮子的影响，还进行了相同波浪条件下的共线波浪和风场试验，风速分别为2米/S和4m/S，分别对应于风力机的运行和生存情况。观测结果表明，在运行状态下，由于风力机的气动阻尼，浮子的峰值响应有所降低，但在生存状态下影响不大。
A new semi-submersible floating structure was proposed on which three wind turbine towers would be installed. This paper presented the dynamic behaviors of the 1/150 scaled rigid model experiments in a water tank. A free vibration test was conducted in still water to obtain the natural periods for verifying the numerical model and modeling the damping ratio of the vertical motion in the part 2 of this study. To evaluate the dynamic behavior of the floater, regular wave tests were conducted with the wave heights 2,4,8cm, wave periods range 0.6~3.0s and the responses of floater were measured by using an optical system. The observed surges varied linearly with the wave height in the ranges of periods far from the natural period. However, the surges normalized by wave height had peaks around the natural period, and decreased significantly when wave heights increased. To investigate the effect of the wind turbines to the floater, collinear wave and wind tests were also conducted in the same wave condition, wind speed was set at 2 and 4m/s corresponding the operating and survival case of wind turbine, respectively. The observed surges showed that the peak responses of the floater decrease in the operating condition due to the aerodynamic damping from wind turbine, but there was little effect in the survival condition.