The aerodynamic damping reflects the aero-structure interaction and is intrinsically involved in a fully coupled turbine. However, it is still of great importance to theoretically quantify the aerodynamic damping of a HAWT in some cases. The existing theory can reasonably characterize the aerodynamic damping level of a HAWT with rigid blades, minute shaft tilt and yaw angles, while certain discrepancies were observed when compared with either experimental or numerical damping results of a more realistic turbine. This study aims to provide an improved theory to incorporate more realistic conditions (i.e., blade flexibility, shaft tilt and yaw angle) in aerodynamic damping estimation. Good agreements are found between the proposed theory and numerical results with varied influential factors, upon which modification factors against the original theory are created and discussed. Finally, the aerodynamic damping of tower is determined and included in a decoupled fatigue analysis framework to demonstrate the potential application of this improved aerodynamic damping theory.

空气动力学阻尼反映了空气与结构之间的相互作用，并固有地参与了完全耦合的涡轮机中。但是，在某些情况下，从理论上量化HAWT的空气动力学阻尼仍然非常重要。现有理论可以合理地描述具有刚性叶片，微小轴倾斜和偏航角的HAWT的空气动力学阻尼水平，而与更现实的涡轮机的实验或数值阻尼结果相比，则观察到某些差异。这项研究旨在提供一种改进的理论，以在空气动力学阻尼估计中纳入更多现实条件（即叶片柔韧性，轴倾斜度和偏航角）。在提出的理论和数值结果之间找到了很好的一致性，并影响了各种因素，在此基础上，创建并讨论了与原始理论相反的修正因子。最后，确定了塔架的空气动力学阻尼，并将其包含在一个解耦的疲劳分析框架中，以证明这种改进的空气动力学阻尼理论的潜在应用。