基于区间参数的水电机组振动传导研究

Vibration path transmissibility analysis for hydropower stations based on interval parameters

在建立的伞式混流式水轮发电机组振动完善模型的基础上,引入各参数的区间性,结合区间算法和随机摄动理论,推导了水电机组各传导路径的传导力及传导率的上、下限和均值的计算表达式,建立了具有区间参数的水电机组-厂房耦合系统的振动传导分析方法。通过算例,分析了结构参数不确定性对传导率的影响,验证了模型和方法的合理性与可行性。该方法能够反映参数不确定时振动传导路径传递率的范围及敏感性等问题,为全面分析水电机组振动传递特性提供理论基础和数据支撑。

The vibration model of an umbrella type mixed-flow turbine generator set was established. The computational expressions for the lower bond, the upper one and the mean value of conduction force and transmission rate of each conduction path were derived using the interval factor method and the random perturbation theory. The vibration path trans-missibility analysis method was established for a hydro-power unit-work shop coupled system with interval parameters. With an example, the effects of the uncertainty of structural parameters on the transmission rate were analyzed, the rationality and feasibility of the model and method presented here were verified. It was shown that this method is able to determine the range and sensitivity of the vibration path transmissibility. The results provided a theoretical basis and a data support for a comprehensive analysis of a hydropower unit＇s vibration transfer characteristics.