Robust Design Of Pipeline Cone Sealing Structure

The sealing technique is widely used in various aspects of industry, agriculture and national defence, etc. How to design effective sealing device has become a main research problem of engineers in the sealing area. Based on the sealing conditions of relevant thin pipeline cone sealing structures given in this paper, and with the application of the finite element analysis software ANSYS, the influence of design parameters of pipeline cone sealing structure on sealing performance is analyzed. Through robust design method, the robust design parameter combinations for the cone head- cone hole sealing structure are achieved.Firstly, according to the sealing mechanism and the use requirement of pipeline cone sealing structures, and based on the principle tests, this paper presents the criterions of sealing performance of the pipeline cone structure sealing set, i.e. the sealing conditions, hence providing preconditions for the finite element numerical simulation.Secondly, by conducting single factor finite element analysis, the relationship curves of the main design parameters of the pipeline cone structure sealing set and the axial preloading force that meets the sealing requirements, of those parameters and the maximum Von Mises stress are obtained. The main design parameter range for the pipeline cone sealing structures is also achieved in this study.Finally, with the application of the quadratic response surface design theory, and on the basis of orthogonal test of the finite element numerical simulation, the quadratic response surface models of various main design parameters of the cone head-cone hole sealing set structure are respectively established with the responses of axial preloading force and maximum equivalent stress that meet the sealing conditions. Moreover, the response surface models are optimized by using genetic algorithms and multi-objective optimization method, and robust design parameter combinations of the sealing structure are attained.