端部质量对有无损伤悬臂梁的模态影响分析

发布时间：2018-01-23 01:44

  本文关键词： 悬臂梁 端部集中质量 转动惯量 裂纹 有限元　出处：《郑州大学学报(工学版)》2016年05期 　论文类型：期刊论文

【摘要】：工程实际中许多结构可简化为端部带有集中质量的悬臂梁,笔者通过数值模拟软件建立了端部带有集中质量的悬臂梁有限元模型,并进行了模态分析.研究了端部集中质量的改变对悬臂梁固有频率的影响,同时建立带有I型裂纹的悬臂梁(端部带有集中质量与不带有集中质量两种)模型,改变裂纹的位置和深度,研究了裂纹深度和裂纹位置对悬臂梁的频率变化规律.通过对比发现,裂纹越靠近端部对梁的频率影响越小,集中质量对带有裂纹悬臂梁固有频率有一定的影响.
[Abstract]:In engineering practice, many structures can be simplified to cantilever beam with concentrated mass at the end. The finite element model of cantilever beam with concentrated mass at the end is established by numerical simulation software. The influence of the change of the end mass on the natural frequency of the cantilever beam is studied, and the model of the cantilever beam with mode I crack (with and without the concentrated mass at the end part) is established. The effect of crack depth and crack position on the frequency of cantilever beam is studied by changing the location and depth of crack. It is found that the closer the crack is to the end, the less the influence on the frequency of cantilever beam is. The concentrated mass has a certain influence on the natural frequency of cantilever beam with cracks.
【作者单位】： 河南理工大学土木工程学院;大连理工大学工程力学系;
【基金】：国家自然科学基金资助项目(51308195) 河南省科技厅科技攻关项目(132102210252)
【分类号】：TB123
【正文快照】： 0引言工程实际中很多结构可简化为端部带有集中质量的悬臂式结构,例如端部带有发动机的飞机机翼,大型吊车,大型悬索大桥,悬臂挑梁,共振式破碎机等,并且生活中的悬臂梁大部分都为柔性悬臂梁(梁长/梁高5).此类结构都可简化为端部带有集中质量的悬臂梁(CBCM,cantilever beam wit，

本文编号：1456334