Optimization design of large vacuum vessel based on ANSYS Workbench stability analysis
The vacuum vessel,as a common equipment in petroleum,chemical and other industries,often suffers stability failure,which is different from those internal-pressure vessels.In this article,firstly,the analysis is conducted on the DN22 000 mm vacuum vessel's eigenvalue buckling with the help of the finite-element software ANSYS Workbench.The results show that the external-pressure bearing coefficient is 17.427,which is much greater than the external-pressure safety factor coeffi-cient of 2.5.Then,the Response Surface Optimization module is used to optimize the vacuum vessel;efforts are made to explore the variation rules of the external-pressure bearing coefficient and the vessel mass changing with the dome wall thickness and the cylinder wall thickness,as well as the variation rules of the external-pressure bearing coefficient,the vessel mass,and the vessel stress changing with the number of the radial ribs in the dome.Finally,it is determined that the dome wall thickness is taken as 20 mm,the cylinder wall thickness is taken as 22 mm,and the number of the radiation ribs in the dome is taken as 16.Compared with the original structure,the optimized structure reduces by 83 140 kg,a reduction of 17.02％,with its stability meeting the require-ments of ASME code,which both realizes the vessel's lightweight design and significantly reduces the manufacturing cost.
large vacuum vesseleigenvalue bucklingresponse surface optimizationlightweightANSYS Workbench
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