Abstract
The vibration of the powerhouse in hydropower station mainly originated from the dynamic loads of turbine and generator set. In the vibration conductivity path there have gain amplification or reduction, so the transmissibility analysis and the transfer path recognition are very important to the vibration analysis and its treatment. Based on energy flow finite element methods, the vibration transmissibility of the powerhouse under turbine dynamic loads was analyzed in this paper. Firstly, the energy transfer characteristics of the different slab structures were analyzed and the results could provide some valuable helps for the vibration control. Secondly, vibrational power flow from spiral case into the upper structures such as pier, wind cover, slab and wall were studied. It is concluded that the supporting structure are the main path for the energy flow, and the reduction effects of the thick slab and wall are much more remarkable. Finally, the law of dominant path recognition was first proposed with a numerical solution. The vibration transmission from the main hall to the auxiliary power house was calculated for the different paths such as joint, foundation and rock around. The results indicated that as a kind of structural joint filler, the closed-cell foam could actively restrict the vibration transmission.
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