椭球形与圆柱形耐压薄壳承载特性对比研究

Comparative research on bearing characteristics of llipsoidal and cylindrical pressure resistant thin shell

将水下无人潜航器耐压结构作为应用背景,为对比椭球形薄壳与圆柱形薄壳承载差异,以应力和弹性稳定性作为典型力学性能指标进行对比。基于第四强度理论,以Mises应力作为典型应力开展数值计算,同等重量下椭球薄壳应力峰值较圆柱薄壳应力峰值小4%左右。以等容积、等重量为前提,基于ISIGHT平台调用Ansys,采用NSGAⅡ优化算法开展椭球薄壳弹性稳定性优化,同等重量、同等有效容积下,椭球薄壳稳定性较圆柱壳提升1.78%~6%;仅要求同等容积时,椭球薄壳稳定性较圆柱壳最大提升约200%。研究成果可为超大潜深潜器耐压结构选型提供借鉴。

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 Ansys 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.