轴流式水轮机组振动传递路径分析

Transmission path analysis for vibration of axial flow turbine unit

轴流式机组的振动问题已成为影响其稳定运行的重要因素之一。为分析轴流式水轮发电机组的振动特性,从振动传导路径的角度出发,基于振动基本理论、一般概率摄动法、矩阵微分理论等方法,在建立合理简化模型的基础上,以区间参数表征各导轴承刚度等参数的不确定性,对水力激励的各主要振动传递路径进行理论分析和数值计算,最终在频域内给出振动路径传递率的梯度排序及其扰动范围。通过算例分析,验证了方法的可行性,为分析机组传递路径及振动控制等问题提供的技术支撑。

Vibration problem of Axial flow turbine has become one of important factors affecting its stable operation.Here,from the angle of vibration transmission path,based on the basic theory of vibration,the general probability perturbation method,the matrix differential theory,etc.,and a reasonable simplified model established,taking interval parameters to characterize the uncertainty of stiffness and other parameters of various guide bearings,theoretical analysis and numerical computation were performed for main vibration transmission paths of hydraulic excitation.Finally,vibration path transmission rates’gradient sorting and their disturbance ranges were given in frequency domain.The feasibility of the proposed method was verified with an example analysis to provide a technical support for vibration transmission path analysis and vibration control of axial flow turbine units.