Ansys中圆柱壳环肋建模方法对振动特性计算影响分析  

Influence of modeling methods of cylindrical shell ring stiffeners on vibration characteristics calculation in Ansys

作　　者：张晓宇 胡大炜[1] 余鹏 张锦岚[1] ZHANG Xiao-yu;HU Da-wei;YU Peng;ZHANG Jin-Ian(Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)

机构地区：[1]武汉第二船舶设计研究所,湖北武汉430205

出　　处：《舰船科学技术》2021年第6期7-13,共7页Ship Science and Technology

摘　　要：本文研究Ansys中2种环肋建模方法对圆柱壳振动特性影响。其中环肋采用梁模型(Beam188单元)和壳体模型(Shell181单元)模拟,计算并对比不同边界条件、不同偏心距及不同环肋尺寸时2种环肋建模方法得到的加筋圆柱壳固有频率和模态振型。结果表明:采用Beam188单元和Shell181单元模拟环肋对计算圆柱壳固有频率存在影响、且环肋尺寸越大二者差异越显著,但对模态振型几乎无影响;增加环肋尺寸对圆柱壳模态振型影响显著。The present paper studies effects of the modelingmethod of ring stiffeners in Ansys on vibration characteristics of ring stiffened cylindrical shells,and the ring stiffeners are modeled as beam and shell models(namely Beam188 and Shell181 elements).Through comparing natural frequencies and mode shapes of two methods for the stiffened shell with different boundary conditions,eccentricities of stiffeners and sizes of stiffeners,the results reveal that effects of two different models of ring stiffeners on natural frequencies are obvious,and the effects increase as the size of stiffeners increases.However,mode shapes are not affected by different models of ring stiffeners.In addition,with the increase of size of stiffeners,effects of ring stiffeners on mode shapes of the shell significantly increase.

关 键 词：圆柱壳 有限元 环肋建模方法 固有频率 模态振型 

分 类 号：TB5350[理学—物理]