Stress Analysis and Structure Optimization of Cryogenic Tank
Cryogenic tanks in mobile pressure vessels are often used to transport cryogenic liquefied gases.The cryogenic tank adopts a double-layer structure,and the stress distribution of the whole structure is uneven due to inertia load in the process of transportation,so the traditional mechanical theory can not be fully applied to the stress strength analysis of the cryogenic tank.Based on the theory of statics,the overall stress level of the cryogenic tank was analyzed by using ANSYS numerical simulation software.According to the response surface experiment design and 3D response surface analysis,it is concluded that the inner cylinder stress is most affected by the inner cylinder thickness,and the stress of the reinforcing ring is most affected by the height of the reinforcing ring in the eight-point support area.ANSYS response surface optimization design module is used to optimize the structure of the cylinder and reinforcing ring in the cryogenic tank.After optimization,the thickness of the inner cylinder is reduced by 20％,the thickness of the reinforcing ring in the eight-point support area is reduced by 50％.The mass of the inner cylinder is reduced by 17％,and the overall mass is reduced by 0.8 tons.The structural stress of the cryogenic tank meets the requirements oftheJB 4732-1995"Steel Pressure Vessels--Design by A nalysis(Confirmed in 2005)",which achieves a balance between safety and economy.
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