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Buckling load predictions in pressure vessels utilizing Monte Carlo method.

机译：利用蒙特卡洛方法预测压力容器的屈曲载荷。

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摘要

In practice, large diameter, thin wall shells of revolution are never fabricated with constant diameters and thicknesses over the entire length of the assembly. These initial geometric imperfections have significant effect on the load carrying capacity of cylindrical shells. The cylindrical shell in the study is flue gas desulphurization (FGD) "vessel" which is a large hybrid tank-vessel-stack assembly in a major Canadian refinery. The function of the FGD vessel is to contain and support a proprietary process that utilizes an ammonium sulphate scrubbing system to produce environmentally friendly air emissions. FGD vessel stack has internal diameter of 6.1m, height of 45.34m and wall thickness of 9.525mm. Initial imperfections in FGD vessel is in the form of wall thickness variations. FGD wall thickness at 144 points along the circumference and elevation are measured. Monte Carlo method is employed to generate the measured data again. Test of significance is carried out to see the accuracy of the data generated. This Monte Carlo algorithm can be used to create data for any type of shell without spending time in actual measurements. Next, load carrying capacity of shell is determined considering imperfections to be axisymmetric and then asymmetric. Fourier decomposition is used to interpret imperfections as structural features can be easily related to the different components of imperfections. Further, double Fourier series is used to represent asymmetric initial geometric imperfections. The ultimate objective of these representations is to achieve a quantitative assessment of the critical buckling load considering the small axisymmetric and asymmetric deviations from the nominal cylindrical shell wall thickness. Analysis of cylindrical shells when used as pressure vessels and are under external pressure is also carried out. Comparison of reliability techniques that employ Fourier series representations of random axisymmetric and asymmetric imperfections in axially compressed cylindrical shells and shells under external pressure with evaluations prescribed by ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 and 2 is also carried out.
机译：实际上，绝不会在组件的整个长度上制造具有恒定直径和厚度的大直径，薄壁旋转壳体。这些最初的几何缺陷会对圆柱壳的承载能力产生重大影响。研究中的圆柱壳是烟气脱硫（FGD）“容器”，它是加拿大一家大型炼油厂的大型混合罐-容器-烟囱组件。 FGD容器的功能是容纳并支持专有工艺，该工艺利用硫酸铵洗涤系统产生对环境友好的废气。 FGD烟囱的内径为6.1m，高度为45.34m，壁厚为9.525mm。 FGD容器的初始缺陷是壁厚变化的形式。测量沿圆周和高程的144个点的FGD壁厚。蒙特卡罗方法被用来再次产生测量数据。进行显着性检验以查看所生成数据的准确性。该蒙特卡洛算法可用于为任何类型的壳体创建数据，而无需花费时间进行实际测量。接下来，考虑到缺陷是轴对称然后是非对称的，确定壳体的承载能力。傅里叶分解用于解释缺陷，因为结构特征可以很容易地与缺陷的不同组成部分相关。此外，使用双重傅里叶级数来表示不对称的初始几何缺陷。这些表示法的最终目的是考虑到与标称圆柱壳壁厚的小的轴对称和不对称偏差，从而实现对临界屈曲载荷的定量评估。当用作压力容器并且在外部压力下时，还对圆柱壳进行了分析。还进行了可靠性技术的比较，这些技术采用ASME锅炉和压力容器规范第VIII节1和2节规定的轴向压缩圆柱壳和外部压力下的壳的随机轴对称和不对称缺陷的傅里叶级数表示。

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  • 作者

    Brar, Gurinder Singh.;

  • 作者单位

    The University of North Carolina at Charlotte.;

  • 授予单位 The University of North Carolina at Charlotte.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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