机械

主轴轴承是风电机组核心零部件之一，为保障机组可靠运行，防止轴承发生早期失效，在机组正式投入使用前，需要通过轴承加速寿命试验进行验证。以典型风电机组载荷为研究对象，分析了轮毂中心各方向载荷特征和分布规律，提出一种将工况载荷简化为试验载荷的等效方法。另外，虽然加速寿命试验可以通过提高试验载荷来缩短试验时间，但载荷超过一定限值会导致轴承发生塑形变形，影响试验结果判定，因此，基于轴承应力和载荷当量计算公式，通过逆向推导方式，完成轴承加速寿命试验过程中载荷限定条件的推导，并通过加速寿命试验对上述方法的有效性进行实际验证。

The main shaft bearing is one of the core components of wind turbine. In order to ensure the reliable operation and prevent early failure, the bearing of the wind turbine should be verified through the accelerated life test before it is put into use. This paper takes typical wind turbine load as the research object, analyzes the load characteristics and distribution rules in all directions of the hub center, and proposes an equivalent method to simplify the working load to the test load. In addition, although the accelerated life test can shorten the test time by increasing the test load, the load exceeding a certain limit will cause deformation of the bearing and affect the judgment of the test results. Based on the bearing stress and load equivalent calculation formula, the paper completes the derivation of the load limit conditions in the process of the accelerated life test of the bearing through reverse derivation. The effectiveness of the above methods is verified by accelerated life test.