工况传递路径分析在核电汽轮发电机振动综合治理中的应用

Application of operational transfer path analysis in comprehensive treatment for nuclear power turbo-generator vibration

以稳定运行工况下汽轮发电机部件振动数据为输入输出信号,建立用于分析发电机部件激振源及传递路径的工况传递路径分析(OTPA)模型,结合奇异值分解(SVD)技术求解出传递率矩阵。通过基于偏相干函数的重相干分析确定模型未遗漏重要激振源和传递路径,通过模拟合成与实测振动响应对比验证了模型的准确性。基于OTPA模型分析不同激励点对目标点的有效振动贡献量,提出激振源贡献度因子,用于分析不同激振源对目标点振动的贡献程度。针对某核电站2台发电机的振动故障,应用OTPA方法计算激振源贡献度因子,结合大修计划制定振动故障综合治理措施,成功消除了2台发电机的振动故障。应用OTPA方法可有效提高发电机振动故障治理效率。

To investigate the excitation sources and transfer path of turbo-generator components, an operational transfer path analysis(OTPA) model is established by using the vibration data of generator components under stable operating conditions as input and output signals. Then, singular value decomposition(SVD) technology is used to solve the transfer rate matrix. It is determined that the model does not omit important excitation source and transfer path by multi-coherence analysis based on partial coherence function. The accuracy of the model is verified by comparing the synthesized signal with measured signal. Based on the OTPA model, the effective vibration contribution of different excitation points to target points is analyzed. The excitation source contribution factor is proposed to analyze the contribution of different excitation sources to target points.Two turbo-generators in a nuclear power station suffered serious vibration fault. Considering overhaul plans of the nuclear power station, the comprehensive treatment measures for vibration fault are formulated by using the OTPA. It shows that the vibration faults of the two generators are successfully eliminated. The application of the OTPA method can improve the efficiency of generator vibration fault treatment.