| 基于加速模态差值法的桁架结构早期损伤识别研究 |
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| 引用本文： | 豆征,王欣.基于加速模态差值法的桁架结构早期损伤识别研究[J].机械设计与制造,2007,6(2):14-15. |
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| 作者姓名： | 豆征 王欣 |
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| 作者单位： | 大连理工大学,机械工程学院,大连,116023 |
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| 摘 要： | 针对起重机械的桁架结构,分析了损伤的严重后果,提出了用加速模态差值法识别早期损伤.首先建立有限元模型,随机选取一根杆件,通过降低其刚度来模拟早期损伤;然后对未损桁架和损伤桁架分别进行模态分析,并提取两者的模态振型数据,通过计算机处理得到损伤前后的加速模态振型,然后进行对比分析,找出加速模态振型变化最大的节点,即为损伤节点,进而找到损伤杆件.实例分析表明,提出的方法合理可行.
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| 关 键 词： | 早期损伤 桁架结构 加速模态 模态振型 模态振型 差值法 桁架结构 早期损伤 损伤识别 研究 boom damage identification difference method mode 方法 分析表 节点 变化 处理 计算机 数据 提取 模态分析 |
| 文章编号： | 1001-3997(2007)02-0014-02 |
| 修稿时间： | 2006-08-26 |
Study on accelerating mode difference method about identification of forepart damage of boom |
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| DOU Zheng,WANG Xin.Study on accelerating mode difference method about identification of forepart damage of boom[J].Machinery Design & Manufacture,2007,6(2):14-15. |
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| Authors: | DOU Zheng WANG Xin |
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| Affiliation: | Dalian Universtigy of Technology, Dalian 116023, China |
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| Abstract: | Boom of lift machine is studied in this paper,severe result of damage is analysed and accelerating mode difference method provided to identify damage.finite element model is constituted,an bar of boom randomly selected,and early damage simulated by degrading its stiffness;Then mode of both intact and damaged boom analysed,mode shape data of them distilled,accelerating mode shape obtained by computer processing,they are contrasted,the node where accelerating mode shape changes the most severe located,then the node is damage node,and the damage bar found.Example demonstrates the method feasible. |
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| Keywords: | Early damage Boom Accelerating mode Mode shape |
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