Light-weight Technology Of The Transport Vehicle For Cryogenic Liquid

With the rapid development of the energy industry, petrochemical and gas industry, the amount and type of transport vehicle for cryogenic liquid is increasing. Due to the graveness of environment pollution and the lack of energy sources, the light-weight technology of the transport vehicle for cryogenic liquid is becoming more and more urgent. With the help of ANSYS and regarding Enric DC18 cryogenic liquid semitrailor as the object of research, the thesis focus on the structure analysis and optimization of the stiffening structure of inner vessel and outer shell for structural light-weight design.The overall model of transport vehicle for cryogenic has been built to optimize the inner vessel support ring by changing the support angle, the size of the support ring and the structure of support ring and evaluate the light-weight effect respectively.Eigenvalue buckling analysis has been done for external pressurized thin walled cylindrical shells with various stiffening rings, which demonstrates two different types of buckling mode according to stiffening ring dimensions. Then analyse two different types of buckling mode and present the concepts of strong stiffening structure and weak stiffening structure conception. By parametric study, the design boundary curve was worked out for the weak and strong stiffening structures. For the weak stiffening structure, the design boundary curves have been also worked out. Empirical formulae were given out for the weak stiffening structures.The stability analysis has been done for external pressurized thin walled cylindrical shells of the combination of large and small stiffening rings. The buckling mode map and critical pressures have been worked out by changing the size of the large and small stiffening rings. Holding the size of both large and small rings constant, the optimal large ring distance was analyzed. By optimization design of the stiffening rings for the outer shell of the studied semitrailor, the mass of the optimized stiffening ring was lightened by 20.64%.