Study On Vibration Transmission Route Of Pumped Storage Power Station Main And Auxiliary Powerhouse

China's water resources are abundant.With the vigorous development of the country's hydraulic industry,the scale of hydropower stations is growing.As an important building in the water conservancy project,the hydropower station powerhouse is responsible for the arrangement of important equipment,and structural safety is very important.Because of the high water head,large capacity,high unit speed and two-way operation of the pumped storage power station,the vibration intensity of the plant is far more than that of the conventional hydropower station powerhouse.When the auxiliary powerhouse cannot be placed on the ground due to terrain conditions in consructions,the strong vibration and noise of the auxiliary plant may cause physical and mental health harm to the staff.In order to control the vibration of the auxiliary powerhouse,it is necessary to conduct a detailed study on the transmission path of the vibration in the main and auxiliary powerhouse to reduce the vibration of the auxiliary plant.In this paper,the finite element method is used to study the transmission of vibration in the auxiliary powerhouse by using the structure of the underground powerhouse of a pumped storage power station.The main research contents are as follows:(1)Based on the finite element method,a three-dimensional finite element model of the coupling system between the underground main powerhouse and auxiliary powerhouse of a pumped storage power station was established,and the calculation and analysis of the self-vibration characteristics and resonance review of the auxiliary powerhouse were carried out.The results show that there is a big gap between the natural vibration frequency of the auxiliary powerhouse and the possible vibration source frequency of the powerhouse.The auxiliary powerhouse will not resonate.(2)By changing the position and simulation range of surrounding rock around the powerhouse,the law of vibration transmission between surrounding rocks of the powerhouse is discussed based on the dynamic response of the auxiliary powerhouse floor.The results show that when the simulation range of surrounding rock increases,the vibration of the auxiliary powerhouse will increase;the surrounding rock on the upstream and downstream sides of the powerhouse plays a leading role in the vibration transmission process;the surrounding rock at the bottom of the powerhouse can transmit vertical vibration,but it has little effect in vibration transmission.(3)Select the powerhouse model in the form of surrounding rock in all directions of the powerhouse width,and add filler materials with different material properties and different elastic modulus in the structural joint of the main and auxiliary powerhouse.Each of the elastic modulus of the non-linear filling material is set to three filling depths,and the linear material of each elastic modulus is set to only one filling depth.After the dynamic response analysis of the above model,the effects of different material properties,parameters and filling depth on the transmission of vibration in the main and auxiliary powerhouses are discussed based on the displacement and acceleration response of the floor and column.The results show that: The filling material in the structural joint mainly transmits longitudinal vibration;when the filling material is simulated to be linear,the longitudinal vibration of the auxiliary powerhouse structure at the filling position is higher than that of the filling material when the nonlinearity of the filling material is simulated;when the elastic modulus of the filling material is large,the longitudinal direction of the auxiliary powerhouse is large.The vibration intensity is higher than the vibration result when the elastic modulus is low;the material filling depth has a great influence on the longitudinal vibration of the floor and column connected thereto.The research conclusion provides valuable references for the vibration reduction design of the auxiliary powerhouse.