Under the service conditions of the main shaft load and yaw system braking of the wind turbine, insufficient friction is likely to lead to equipment failure. To ensure the operation safety of the main drive system of the wind turbine, the accurate determination of static friction coefficient between contact pairs is necessary. This work takes the contact pair between the hub and main shaft of the offshore wind turbine as the research object to explore the friction-increasing mechanism. The influence of the static friction coefficient on the load-carrying capacity of the wind turbine is accurately calculated by the sensitivity algorithm, and the sensitivity reaches the order of 10⁶-10⁸. By analyzing the surface morphology, hardness, and element distribution of different surface treatment processes (surface machining, coating, paint- spraying), the main factors affecting the static friction coefficient are obtained from the perspective of the friction-increasing. In order to realize the quantification and exact calculation of different friction-increasing factors, a comprehensive static friction coefficient prediction model is established. Through the experimental test, the maximum error is only 9.51%, which verifies the accuracy of the theoretical model, and the optimal process is obtained. The conclusions can provide references for the accurate design of the main drive system of wind turbines.

在风机主轴负载和偏航系统制动的使用条件下，摩擦力不足很可能导致设备故障。为保证风电机组主传动系统的运行安全，需要准确测定接触副之间的静摩擦系数。本工作以海上风电机组轮毂与主轴的接触副为研究对象，探索其增摩机理。通过灵敏度算法准确计算静摩擦系数对风机承载能力的影响，灵敏度达到10 ⁶ -10 ⁸量级. 通过分析不同表面处理工艺（表面加工、涂层、喷漆）的表面形貌、硬度和元素分布，从增摩擦角度得出影响静摩擦系数的主要因素。为实现对不同增摩因素的量化和精确计算，建立了综合静摩擦系数预测模型。通过实验测试，最大误差仅为9.51%，验证了理论模型的准确性，得到了最优工艺。研究结论可为风电机组主传动系统的精确设计提供参考。