基于混合TPA的水电机组厂房振动传导研究

Vibration conduction analysis of a hydropower plant based on hybrid TPA

机组的稳定运行对水电站厂房上下游的经济和社会发展具有重要支撑作用,新时期对水电机组厂房的稳定性要求愈发增高,但以原型观测为基础的振动理论分析与工程实践仍然滞后。为解决水电厂房测点数量不足的问题,该研究以原型观测为基础,考虑大体系非线性结构的耦合振源传播与放大机理,以实测与仿真计算频响函数(frequency response function, FRF)为核心,搭建混合振动传递路径分析(transfer path analysis, TPA)模型,开展原型-仿真联立分析的水电机组振动传递研究,识别水电机组未测振源、确定振动成分的贡献量等,明确影响响应目标点振动水平的根本原因,并提出局部结构减振措施,形成一套基于传递路径分析方法的水电站厂房振动分析与控制,为我国水电机组的安全稳定运行、结构设计和优化奠定理论基础。

Stable operation of a unit plays an important role in supporting the economic and social development of the upstream and downstream of a hydropower plant. With the requirements for the stability of the hydropower plant, the vibration theory analysis and engineering practice based on prototype observations seriously lag. Based on prototype observation, the coupled vibration source propagation and amplification mechanism of the nonlinear structure were considered in this paper, a hybrid transfer path analysis(TPA) model was built with the core of actual measurement and simulation calculation frequency response function(FRF), the research on the vibration transmission of the hydropower unit of the prototype-simulation simultaneous analysis was carried out. The unmeasured vibration sources of the hydropower unit were recognized, the contribution of the vibration component was determined, and the root cause of the vibration level on the response target point was clarified. Result shows the local structural vibration reduction measures form a set of hydropower plant vibration analysis and control strategy based on the transmission path analysis method, which lays a theoretical foundation for the safe and stable operation, structural design and optimization of hydropower units.