【摘要】 针对某大型水电站200 MW混流式水轮发电机组在长期运行中出现的转子中心体支撑筋板裂纹问题，本文创新性地提出了理论-仿真-实测的闭环研究体系，以此方法为基础开展了动应力测试与力学特性研究。通过布置6个应变测点(包含支撑筋板过渡圆角区域、板厚变化区域等关键部位)，结合无线应变采集系统实测机组在启停机、变转速、变励磁、变负荷、AGC等典型工况下的动态应力响应；利用ANSYS Workbench建立三维瞬态动力学模型，验证实测数据的准确性(应力误差<10%)。结果表明：此电站机组转子中心体最大动应力出现在支撑筋板过渡圆角区域，主要受偏心磁拉力(占比31%)与电磁扭矩(占比44%)耦合影响；此区域应力集中系数达3.2，与仿真误差<6%。本文的研究为水轮发电机组转子中心体结构优化及状态监测提供了关键数据支撑。更多还原

【Abstract】 To address cracks in the support rib plates of the rotor hub in a 200 MW Francis turbine generator set at a largescale hydropower plant during long-term operation, this paper proposes an innovative closed-loop research system integrating theoretical analysis, simulation and measurement. Using this approach, dynamic stress testing and mechanical property analysis were conducted. Six strain measurement points were arranged in different areas, including critical areas such as the support rib plate’s thickness transition zone and transition fillet area. By employing a wireless strain acquisition system, the dynamic stress responses under typical operating conditions—start-stop, variable speed, variable excitation, variable load, and AGC—were measured. A three-dimensional transient dynamic model was developed with ANSYS Workbench to validate the accuracy of the measurements(stress error <10%). The results indicated that the maximum dynamic stress in the rotor hub occurred at the support rib plate’s transition fillet area, primarily influenced by the combined effects of eccentric magnetic pull(31%) and electromagnetic torque(44%). The stress concentration factor reached 3.2 in this area, with less than 6% deviation from simulation results. This research provides essential data support for the structural optimization and condition monitoring of the rotor hub of hydro-generator sets.更多还原