The Parameter Optimization Design Of An Armored Vehicle Shell Stiffeners Based On ANSYS

Stiffener, as an accessory, to which can meet the products requirements of lightweight, ismore and more widely used in the aerospace, military and other fields. For a long time, thedesign of stiffener is mainly based on experience, and this method often leads to the waste ofmaterial and the additional mass of stiffeners is too large, as a result, it is not conducive to theperformance of the product effectively. The optimization theory provides a proven method todetermine sizes of the stiffener, and this paper is based on the finite element analysis softwareANSYS as a platform to make the size optimization of stiffeners.The thesis established the finite element model of an armored vehicle’s top deck(thin-shell structure) which under three kinds of stiffeners reinforced, took the cross-sectionaldimensions of stiffener as the design variables, the amount of deformation and stress ofstiffener as the state variables, the minimum volume of stiffener as the target, and made thesize optimization of the three kinds of stiffeners finite element model. To verify thereliability and accuracy of the finite element calculation results in ANSYS，the authordesigned the stress test system of simple stiffener plate structure, through the comparisonbetween the test results and finite element results, revised their finite element model.Based on the principle of optimization，the author made the size optimization of threestiffeners on the top deck of an armored vehicle model in ANSYS with APDL. Theoptimization method of ANSYS have sub-problem method and first-order method, the authormade the size optimization of the single T-shape stiffener with the sub-problem method andfirst-order method individually, conjured the comprehensive optimization, which take thesub-problem optimization result as the first-order optimization input, and then use thefirst-order optimization from the results and get the best result. Applied the three methods tothe size optimization of the three kinds of stiffeners, and the results showed that the effect ofthe comprehensive optimization method is superior than single method of sub-problem and first-order method. Through the optimization, won the optimal parameters of three kinds ofstiffeners which under static load, and ensured the reliability of the structure, realized theweight loss.