Comparative research on bearing characteristics of ellipsoidal and cylindrical pressure resistant thin shell
Taking the pressure resistant structure of underwater unmanned vehicle as the application background,stress and elastic stability were compared with the bearing difference between ellipsoidal thin shell and cylindrical thin shell,and stress and elastic stability were compared as typical mechanical property indicators.Based on the fourth strength theory,the Mises stress was used as the typical stress to carry out numerical calculation,and the peak stress of ellipsoidal thin shell is about 4％smaller than that of cylinder under the same weight.On the premise of equal volume or weight,call start the An-sys via the ISIGHT platform.NSGA Ⅱ optimization algorithms were used to optimize the elastic stability of ellipsoid thin shell,and the stability of ellipsoid was increased by 1.78％～6％compared with that of cylinder under the same weight and the same effective volume.When the same volume is required only,the stability of ellipsoid was increased 200％compared to that of cylinder under certation condition.The research results provide reference for the selection of pressure resistant structure of ultra-large deep submersibles.
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