开孔球面舱壁特征应力组合代理模型预报方法  

Combined surrogate model for stress prediction of spherical bulkhead with openings

作　　者：陈天怡 和卫平[2] 刘均[1] 程远胜[1] CHEN Tianyi;HE Weiping;LIU Jun;CHENG Yuansheng(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)

机构地区：[1]华中科技大学船舶与海洋工程学院,湖北武汉430074 [2]武汉第二船舶设计研究所,湖北武汉430205

出　　处：《中国舰船研究》2022年第6期236-243,共8页Chinese Journal of Ship Research

摘　　要：[目的]开孔球面舱壁结构参数众多,直接利用有限元方法对其开展参数研究费时费力,为此,提出一种特征应力组合代理模型预报方法。[方法]提取开孔球面舱壁的几何特征参数,以此为设计变量构建一般形式的单开孔球面舱壁特征应力代理模型;采用代理模型对特征应力与结构参数进行相关性分析,提出一种缩减设计变量维度的组合代理模型方法,组合代理模型由基于柱-环-球壳参数构建的特征应力代理模型及基于开孔围栏参数和球壳厚度构建的特征应力修正系数代理模型组成。[结果]结果显示,该组合代理模型能降低设计变量的维度,使得精度明显提升,相比直接构建的代理模型,其特征应力最大误差和平均误差分别降低了4.96%~22.95%和0.59%~5.43%;应用单开孔组合代理模型对典型的多个开孔球面舱壁特征应力进行的预报显示,特征应力误差为0.12%~11.42%。[结论]所提的单开孔球面舱壁强度组合代理模型能用于多个开孔球面舱壁特征应力的快速预报。[Objective]A spherical bulkhead with openings has many structural parameters,and it is timeconsuming and laborious to directly use the finite element method to carry out parameter research.Therefore,a combined surrogate model method for predicting characteristic stresses is proposed.[Method]The geometric characteristic parameters of an opening spherical bulkhead are extracted and used as design variables to construct a surrogate model for the characteristic stresses of a spherical bulkhead with a single opening.After analyzing the correlation between the characteristic stresses and structural parameters using the surrogate model,a combined surrogate model method with lower dimensions of design variables is proposed.The combined surrogate model consists of a surrogate model of characteristic stresses based on the parameters of a cylindrical-toroidal-spherical shell and a surrogate model of characteristic stress correction coefficients based on the opening fence parameters and thickness of the spherical shell.[Results]The results show that the accuracy of the combined surrogate model is significantly improved due to the lower dimensions of design variables.Compared with the results of the directly constructed surrogate model,the maximum error and average error of the characteristic stresses are reduced by 4.96%-22.95% and 0.59%-5.43% respectively.The single-opening combination surrogate model is used to predict the characteristic stresses of a typical spherical bulkhead with multiple openings,and the prediction errors of the characteristic stresses are 0.12%-11.42%.[Conclusion]The proposed combined surrogate model for the strength of a spherical bulkhead with a single opening can be used for the rapid prediction of the characteristic stresses of spherical bulkheads with multiple openings.

关 键 词：球面舱壁 代理模型 开孔加强 应力预报 

分 类 号：U663.4[交通运输工程—船舶及航道工程]