Analysis of natural vibration characteristics of underground powerhouse structure in a large pumped storage power station
Analysis of natural vibration characteristics is the basis of vibration research of underground powerhouse structure in pumped storage power stations.Taking the underground powerhouse of the Fengning pumped storage power station as an example,a three-dimensional finite element model of the underground powerhouse structure in variable speed unit section was established.Firstly,the influences of different boundary conditions on the natural vibration characteristics of the whole structure and local structures of the underground powerhouse were studied by using the modal analysis method.Then,the possible vibration sources of the Fengning underground powerhouse were analyzed,and the resonance checks were conducted on the whole structure and local structures of the power-house.The results indicate that the enhancement of spring constraints on the upstream and downstream side walls can effectively improve the natural frequencies of the whole structure of the powerhouse,but has little effect on the local natural frequencies of the floors and has little effect on the natural frequencies of the stairs.Fixed boundaries can significantly increase the natural frequencies of the whole structure of the powerhouse,and also have a great in-fluence on the natural frequencies of the local structures such as floors,pillars,wind hood and machine pier.The resonance possibilities of the whole structure and local structures of the powerhouse are very low under the actions of possible vibration sources.
pumped storage power stationunderground powerhouse structureboundary conditionnatural fre-quencyresonance check
万方数据
维普
