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首页> 外文会议>The 7th China-Japan-Korea joint symposium on optimization of structural and mechanical systems >Optimum Buckling Design of Stiffened Thin-Walled Cylindrical Shell
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Optimum Buckling Design of Stiffened Thin-Walled Cylindrical Shell

机译：加筋薄壁圆柱壳的最佳屈曲设计

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Most thin-walled structures tend to be failure caused by their instability under pressure load.Reinforced with ribs is an effective way to improve the bucking bearing capacity of thin-walled structures.In this paper, a parameterized model of stiffened thin-walled cylindrical shell was set up.Linear buckling analyses under axial compression of stiffened thin-walled cylindrical shells which have specified volume and different number of ribs are carried out. The results show that the number of rib, the skin thickness and the rib sectional sizes all have important influence on the structure’s bucking bearing capacity.An optimization model of stiffened thin-walled shell which has a specified volume is built. The objective of the optimization model is the maximum buckling bearing capacity.Its design variables include longitudinal rib number, skin thickness and rib sectional sizes. The optimization model is solved by genetic algorithms. The parameterized structural analysis process is set up by ANSYS APDL and the automatic re-analysis of the structure is realized.MATLAB genetic algorithms toolbox is applied in the solution process at the same time. Through this optimization program, the optimal longitudinal rib number, skin thickness and rib sectional sizes can be solved out.Comparing with the non-optimized structure, optimized structure has a significant improvement on linear buckling bearing capacity.When local buckling and overall buckling occur at the same time, as optimized structure, stiffened thin-walled cylindrical shell would gain the maximum buckling bearing capacity.Finally, nonlinear buckling analyses of stiffened cylindrical shell which is subjected to axial pressure with initial geometric imperfection are studied. The analyses are considering both geometric nonlinear and material nonlinear.Compared with nonlinear buckling analyses, optimum solution with linear buckling analyses is not just the maximum overall buckling load value of the structure. The reason is that when there are fewer ribs, linear buckling bearing capacity could be much smaller than the maximum bearing capacity of the whole structure.Otherwise, when there are more ribs, linear buckling bearing capacity could be larger than the maximum carrying capacity of the whole structure.When structure’s volume, diameter, height and rib sectional sizes are all specified, ribs number must be selected within an optimum range to get the maximum bearing capacity of stiffened thin-walled cylindrical shell.Reinforced with either too many ribs or too few ribs cannot obtain the maximum buckling bearing capacity of stiffened cylindrical shell.When there are too few ribs, structure which is under axial compression would occur local buckling prematurely. That will be harmful to the structure’s bearing capacity.When there are too many ribs, the stiffened thin-walled cylindrical shell would be sensitive to initial geometric imperfections.It is also no good to structure’s buckling bearing capacity.Only when suitable number of rib is adopted, the maximum buckling bearing capacity of structure would be obtained. This guideline is a typing sample of paper manuscripts. The manuscripts should be prepared in such a way that they are directly suited for photo-offset reproduction.Please follow the instruction to insure the uniformity in appearance of the papers in the Symposium Proceeding
机译：大多数薄壁结构往往是由于其在压力作用下的不稳定性而导致失效。肋筋加固是提高薄壁结构屈曲承载力的有效方法。本文采用了一种加筋薄壁圆柱壳的参数化模型。进行了具有指定体积和不同肋​​数的加劲薄壁圆柱壳在轴向压缩下的线性屈曲分析。结果表明，肋的数量，表皮厚度和肋的截面尺寸均对结构的抗弯承载力有重要影响。建立了具有指定体积的加筋薄壁壳体的优化模型。优化模型的目标是最大屈曲承载力，其设计变量包括纵向肋骨数量，蒙皮厚度和肋骨截面尺寸。通过遗传算法求解优化模型。通过ANSYS APDL建立参数化的结构分析过程，实现结构的自动重分析。同时将MATLAB遗传算法工具箱应用于求解过程。通过该优化程序，可以求解出最佳的纵向肋数，表皮厚度和肋截面尺寸，与非优化结构相比，优化结构在线性屈曲承载力上有显着提高。同时，作为优化的结构，加筋薄壁圆柱壳将获得最大的屈曲承载力。最后，研究了承受初始几何缺陷的轴向压力的加筋圆柱壳的非线性屈曲分析。这些分析同时考虑了几何非线性和材料非线性。与非线性屈曲分析相比，线性屈曲分析的最佳解决方案不仅是结构的最大总屈曲载荷值。原因是当肋骨较少时，线性屈曲承载力可能会比整个结构的最大承载能力小得多;否则，当肋骨较多时，线性屈曲承载力可能会大于整体结构的最大承载能力。当指定了结构的体积，直径，高度和肋截面尺寸时，必须在最佳范围内选择肋的数量，以使加硬薄壁圆柱壳具有最大的承载能力。肋条不能获得加硬圆柱壳的最大屈曲承载力。肋条太少时，受到轴向压缩的结构会过早发生局部屈曲。这会有害于结构的承载力，当肋骨过多时，加筋的薄壁圆柱壳将对初始几何缺陷敏感，也不利于结构的屈曲承载力，仅当肋骨数量合适时采用这种方法，可以获得结构的最大屈曲承载力。本指南是纸质手稿的打字样本。手稿的制作方式应使其直接适合于胶印复制。请按照说明进行操作，以确保论文在论文集上的统一性

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