五强溪水电厂底孔密封性能仿真模拟研究

In order to solve the problems of water seal in hydropower station gates such as cracking sealing performance during operation, difficulty in predicting sealing performance and lack of theoretical basis for determining bolt preload when replacing water seal, a compensation model of bolt preload based on multiple linear regression is proposed. Combined with engineering examples, a hyperelastic constitutive model of square P-type water seal was established by Ogden formula, and the nonlinear finite element model of water seal under complex working conditions was established. Based on Ansys, the water seal contact stress under four influencing factors was calculated, and the independent and comprehensive influence rules of various factors on the sealing performance of water seal were analyzed. On the basis of finite element analysis, the contact stress calculation formula was established based on multiple linear regression, and the bolt preload compensation model was constructed. The prediction of water seal performance and the calculation of bolt preload compensation are realized. The results show that the average relative error between the contact stress based on the bolt preload compensation model and the expected value is 7.6%, and the maximum relative error is 16.9%. The model can correct the bolt preload when the installation condition changes, so as to obtain the expected sealing performance of the water seal, which provides a reliable basis for the design and installation of the water seal structure in practical engineering.