基于应变模态分析的桁架结构损伤检测

doi:10.3969/j.issn.1000-1158.2014.04.09

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摘要选用桁架结构作为研究对象,应用应变模态分析方法对桁架结构的损伤进行检测。由位移模态振型推导应变模态进而用应变模态差值作为桁架结构损伤检测指标,提出了一种基于3σ准则的损伤阈值。通过应变模态差值与损伤阈值的对比来判别损伤有无并对损伤进行定位,用损伤前后应变差值的突变大小来初步确定桁架结构的损伤程度。对一具体桁架结构的单处和多处不同程度损伤工况,结合有限元软件进行了数值模拟。实际桁架的损伤检测实验验证了该方法的有效性。

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	温银堂
	张玉燕
	张丽丽
	罗小元
	王洪瑞

关键词 ：计量学, 损伤识别, 桁架结构, 应变模态差值, 损伤阈值

Abstract：Taking the truss structure as the research object, the strain modal analysis is used to identify the damage of the truss structure. The strain modal can be deduced from displacement model shapes,then the difference of strain modal is used to be truss structural damage detection index,and the damage threshold based on the 3σ criteria is presented. Through the strain mode difference and damage threshold of contrast to determine whether there is damage and locate it,furthermore preliminary determine the extent of the truss structure with the size of the strain difference between before and after injury. The damage conditions of single damage and multiple damages in different degree of a practical truss structure,are numerically simulated with finite element software numerical simulations respectively.Furthermore further experiment research,by applying this method to actual truss damage detection,proves the effectiveness of the proposed method.

Key words： Metrology Damage identification Truss stucture Strain modal difference Damage threshold

基金资助:河北省自然科学基金(F2012203184);教育部博士点基金(20111333120009)

通讯作者: 罗小元为本文通讯作者。xyluo@ysu.edu.cn

作者简介: 温银堂(1978-), 男,河北保定人,燕山大学副研究员,主要从事传感器技术与故障诊断研究。

引用本文:

温银堂, 张玉燕, 张丽丽, 罗小元, 王洪瑞. 基于应变模态分析的桁架结构损伤检测[J]. 计量学报, 2014, 35(4): 344-349.
WEN Yin-tang, ZHANG Yu-yan, ZGANG Li-li, LUO Xiao-yuan, WANG Hong-rui. Damage Detection of Truss Structure Based on Strain Mode Analysis. Acta Metrologica Sinica, 2014, 35(4): 344-349.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2014.04.09 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2014/V35/I4/344

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