Relational grade analysis of the natural vibration frequency of hydropower house and influencing factors
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Abstract:
Natural vibration frequency is related to the safety of hydropower stations under dynamic loads. It is significant to predict and control the frequency during the design phase. We performed modal analysis on the hydropower house using the ANSYS finite element software. Thus, we obtained the natural vibration frequency of the structure under the different material parameters (elasticity modulus and bulk density) of the first- and second-stage concrete and the foundation. We estimated the correlation between the structure's natural vibration frequency and the main material parameters using the systematical analysis method based on grey relational grade. The following conclusions were reached. When only the elasticity modulus was considered, the elasticity modulus of the foundation had the largest influence on the natural vibration frequency, followed by the first-stage concrete and the second-stage concrete of the hydropower house. When only the concrete bulk density was considered, the influence of the second-stage concrete bulk density was slightly larger than that of the first-stage concrete. When both elasticity modulus and concrete bulk density were considered, the concrete bulk density had a greater influence than elasticity modulus on the natural vibration frequency of the hydropower station, and their correlations with the natural vibration frequency showed little difference. The research results can provide reference for controlling the natural vibration frequency of similar structures.
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