Non-Probabilistic Robust Design Of Cone Pipe Joint Sealing Structure

The sealing technique is very important in various aspects of agriculture, industry and national defence, etc. The effective sealing has decisive effect on reliability and security of the system. The sealing conditions of "hard-soft-hard" sealing structures are given in this paper. The finite element model is established basing on it, and the relationship between design parameters of pipeline cone sealing structures and sealing performance is analyzed. Through the non-Probabilistic reliability theory, the robust of pipeline cone sealing structures is designed. And the reasonable parameter combinations for the pipeline cone sealing structures are achieved.Firstly, according to the knowledge of the pipeline cone sealing structures, the sealing mechanism and the principle sealing tests, this paper presents the criterions of sealing performance of the pipeline cone structures, the sealing conditions. The sealing conditions provide preconditions for the finite element simulation.Secondly, by finite element analysis of single factor of the sealing structures, the relationship curves between the main design parameters and the axial preloading force that meets the sealing requirements, between the parameters and the sealing surface width, between the parameters and the maximum Von Mises stress are obtained. Reasonable range of the main design parameters for the pipeline cone sealing structures is also achieved.Finally, through the theory of the quadratic response surface design, and by the orthogonal tests of the finite element simulation, the quadratic response surface models of main design parameters of the pipeline cone structures are established, which responded by axial preloading force that meet the sealing conditions. Moreover, by using the non-Probabilistic reliability theory, the non-Probabilistic reliability model of axial preloading force is established. And with the genetic algorithms, optimal solution of the non-Probabilistic reliability model is achieved, and also the design parameters that meet the robust requirements are achieved.