Study On Vibration Transmisssion Path Of Underground Powerhouse Of Pumped Storage Power Station Based On Structural Sound Intensity Method

Based on the structural sound intensity method,this paper studies the vibration transmission path of underground powerhouse of pumped storage power station,analyses the vibration energy distribution of different typical parts of powerhouse under diferent operating conditions,and probes into the vibration transmission path of powerhouse under different vibration sources,which can not only provide prediction and control for the vibration of powerhouse,but also provide reference for the optimization design of vibration absorption and isolation of structure.This paper establishes its own drawing method of three-dimensional structural acoustic intensity vector map:extracting the data needed for calculation based on ansys finite element harmonic response analysis,processing the unit data and calculating the structural acoustic intensity value by excel,and mapping the structural acoustic intensity vector value of the unit with the unit coordinates by originpro to draw the unit three-dimensional vector map.The feasibility of structural sound intensity method is verified by an example,and the relative accuracy of different calculation schemes for different structural sound intensity vectors is discussed.The scheme using element stress and node displacement is determined,which provides a basis for the study of vibration path of powerhouse structure.The vibration transmission path of the workshop under dynamic load is discussed.The structure sound intensity and vibration energy distribution of the typical parts in three difTerent working conditions(rated,escaped and half pole short circuit)are compared.The three-dimensional vector diagram of the structure sound intensity of the typical parts under the corresponding working conditions is drawn,and the visualization of the vibration energy transmission process is realized.At the same time,the sound intensity vectors of each layer and section of the whole factory building are calculated in detail,and the transmission law of vibration energy is discussed.The transmission paths of vibration of powerhouse under the action of volute fluctuating pressure are analyzed.The structural sound intensity values of floor,wind shield and column of powerhouse under two conditions of power generation and pumping are calculated.The main transmission paths of vibration are obtained by analyzing the structural sound intensity vectors of typical parts of powerhouse structure,and the vibration of powerhouse structure under the action of volute fluctuating pressure is studied.Distribution,transmission and attenuation of kinetic energy.Based on the study of single vibration source,the vibration path of powerhouse structure under multi-vibration source load is studied.The structural sound intensity values of different layers and sections of powerhouse under the combined action of dynamic load of generating unit,fluctuating pressure of volute and fluctuating pressure of draft tube are calculated under the conditions of normal power generation and normal pumping.The three-dimensional sound intensity vector maps of typical parts are drawn.By comparing the sound intensity and vibration energy distribution under the source load,the vibration energy distribution and transmission law of the powerhouse structure under the multi-source load are summarized,which is more in line with the actual situation.