摘要
在本文中,通过建立桁架有限元模型,随机抽取几个杆件,以降低其刚度的方式来模拟早期损伤(即小损伤);对损伤前后的桁架分别进行模态分析,并提取其模态振型数据,利用Matlab软件对损伤前后的模态振型数据进行放大、减差处理,通过倍差图判断损伤节点,从而找到损伤位置。这里对40个节点的前五阶振型进行了分析。
In this paper, first finite element model of truss configuration is established, and then several bars are selected stochasticly, simulate its early damage by reduce its elasticity module ; mode of damaged and non-damaged of truss configuration is analysed respectively, and some data of mode shape is extracted, then analyse these data by software of Matlab and obtain graph of times-difference of mode ; search damaged nodes in obtained graph. This paper analyses former five ranks mode shape of forty nodes of all,
出处
《现代机械》
2006年第6期1-2,共2页
Modern Machinery
关键词
早期损伤
桁架结构
模态振型
倍差分析
early damage
truss configuration
mode shape
times-difference analysis
