Optimization of the rod forces in the reticular support structure of JUNO central detector
Optimization of the rod forces in the reticular support structure of JUNO central detector
复制标题
JUNO中心探测器网状支撑结构中杆力的优化
DOI：
10.1016/j.istruc.2021.05.038
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发表时间：
2021-10
期刊：
影响因子：
4.1
通讯作者：
Yaozhi Luo
中科院分区：
文献类型：
--
作者：
Yanfeng Zheng;Jingyao Zhang;Makoto Ohsaki;Hua-Ping Wan;Chao Yang;Yaozhi Luo
江门地下中微子观测站（JUNO）中心探测器结构复杂，所处环境复杂。内部连续的丙烯酸酯球壳通过不锈钢杆连接到外部网状不锈钢（SS）壳，所有这些结构部件都由SS支撑框架支撑。由于内壳内部的检测液体的密度小于外部水的密度，所以内壳受到相当大的浮力。由于这些复杂的情况下，这样的地下结构受到浮力和压力载荷的载荷路径的优化是困难的，在本文中，我们解决的问题，找到最佳的载荷路径，以尽量减少杆力。我们采用了三种与荷载路径相关的设计变量，即，杆位置、烟囱液位和盘簧刚度。具体而言，采用B样条函数映射杆件位置，大大减少了变量数量，并将影响压力分布的烟囱液位作为新型设计变量。随后，结合有限元分析和无导数优化算法的数值方法。在优化结果的基础上，深入讨论了设计变量的类型、数量、初始值等对优化结果的影响。结果表明，烟囱液位和碟形弹簧刚度对杆力分布的影响是全局性的，而杆力的分布强烈依赖于杆的位置。所提出的方法被证明是有效的，以找到一个复杂的球壳结构在各种非线性约束下的最佳载荷路径。
The structure of Jiangmen Underground Neutrino Observatory (JUNO) central detector is a complex structure subjected to a complex environment. The inner continuous acrylic spherical shell is connected to the outer reticulated stainless-steel (SS) shell through SS rods, and all these structural components are supported by an SS supporting frame. The inner shell is subjected to considerable buoyancy since the detection liquid inside the inner shell has less density than the outside water. Optimization of load path of such an underground structure subjected to buoyancy and pressure loads is difficult due to these complex situations, and in this paper, we tackle the problem of finding the optimal load path to minimize the rod forces. We adopt three types of design variables relevant to the load path, i.e., rod locations, chimney liquid level, and disc spring stiffness. Specifically, B-spline function is adopted to map the rod locations so as to significantly reduce the number of variables, and the chimney liquid level that influences the pressure distribution is taken as a new type of design variable. Subsequently, a numerical method combining the finite element analysis and a derivative-free optimization algorithm is proposed. Based on the optimization results, influences of the design variables, including their types, number, and initial values, on the optimal solutions are discussed in depth. The results suggest that the chimney liquid level and disc spring stiffness have a global effect of shifting rod force distribution, while distribution of rod forces strongly depends on the rod locations. The proposed method is shown to be effective to find an optimal load path of a complex spherical shell structure under various nonlinear constraints.
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作者：
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