Abstract A linearized aero-hydro-servo-elastic floating wind turbine model is presented and used to perform integrated design optimization of the platform, tower, mooring system, and blade-pitch controller for a 10 MW spar floating wind turbine. Optimal design solutions are found using gradient-based optimization with analytic derivatives, considering both fatigue and extreme response constraints, where the objective function is a weighted combination of system cost and power quality. Optimization results show that local minima exist both in the soft-stiff and stiff-stiff range for the first tower bending mode and that a stiff-stiff tower design is needed to reach a solution that satisfies the fatigue constraints. The optimized platform has a relatively small diameter in the wave zone to limit the wave loads on the structure and an hourglass shape far below the waterline. The shape increases the restoring moment and natural frequency in pitch, which leads to improved behaviour in the low-frequency range. The importance of integrated optimization is shown in the solutions for the tower and blade-pitch control system, which are clearly affected by the simultaneous design of the platform. State-of-the-art nonlinear time-domain analyses show that the linearized model is conservative in general, but reasonably accurate in capturing trends, suggesting that the presented methodology is suitable for preliminary integrated design calculations.

中文翻译：

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翼梁浮式风力机集成设计优化

摘要 提出了一种线性化的气动-水力-伺服-弹性浮动风力发电机模型，并用于对10 MW翼梁浮动风力发电机的平台、塔架、系泊系统和桨距控制器进行集成设计优化。考虑到疲劳和极端响应约束，使用基于梯度的优化和解析导数找到最佳设计解决方案，其中目标函数是系统成本和电能质量的加权组合。优化结果表明，对于第一种塔架弯曲模式，在软硬和刚硬范围内都存在局部最小值，需要进行刚硬塔设计以达到满足疲劳约束的解决方案。优化后的平台在波浪区具有相对较小的直径，以限制结构上的波浪载荷，并在水线以下形成沙漏形状。该形状增加了音高的恢复力矩和固有频率，从而改善了低频范围内的行为。塔架和桨距控制系统的解决方案显示了集成优化的重要性，这显然受到平台同步设计的影响。最先进的非线性时域分析表明，线性化模型通常是保守的，但在捕捉趋势方面相当准确，表明所提出的方法适用于初步的集成设计计算。这导致低频范围内的行为得到改善。塔架和桨距控制系统的解决方案显示了集成优化的重要性，这显然受到平台同步设计的影响。最先进的非线性时域分析表明，线性化模型通常是保守的，但在捕捉趋势方面相当准确，表明所提出的方法适用于初步的集成设计计算。这导致低频范围内的行为得到改善。塔架和桨距控制系统的解决方案显示了集成优化的重要性，这显然受到平台同步设计的影响。最先进的非线性时域分析表明，线性化模型通常是保守的，但在捕捉趋势方面相当准确，表明所提出的方法适用于初步的集成设计计算。