| 温度变化下基于兰姆波的复合材料结构损伤识别(英文) |
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| 引用本文： | 严刚,周丽.温度变化下基于兰姆波的复合材料结构损伤识别(英文)[J].南京航空航天大学学报(英文版),2011,28(3):231-239. |
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| 作者姓名： | 严刚 周丽 |
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| 作者单位： | 南京航空航天大学航空宇航学院,南京,210016,中国 |
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| 基金项目： | Supported by the Aeronautical Science Foundation of China(2008ZA52012); the Six Kinds of Excellent Talent Project in Jiangsu Province of China(2010JZ004); the Research Foundation of Nanjing University of Aeronautics and Astronautics(NS2010027)~~ |
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| 摘 要： | 提出了一种基于兰姆波的两步识别方法,对温度变化下复合材料结构内部损伤进行监测和识别。首先采用统计偏值分析方法来判别传感器网络监测到的兰姆波信号变化是由损伤引起还是由温度变化引起,从而确定损伤是否发生。在对兰姆波进行傅里叶变换后,从统计角度定义损伤指标以考虑温度变化的影响,并采用蒙特卡罗方法计算无损状态下损伤指标的阈值。如果在运行状态下获得的损伤指标超过了阈值,则认为损伤发生。然后采用损伤存在概率成像方法融合多个激励-接收路径上的损伤指标信息生成诊断图像实现损伤位置识别。对温度变化下的加筋复合材料壁板试件进行的实验研究表明了所提出方法的有效性。
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| 关 键 词： | 结构健康监测 复合材料结构 兰姆波 统计偏值分析 损伤概率成像 温度变化 |
DAMAGE DETECTION FOR COMPOSITE STRUCTURE UNDER TEMPERATURE CHANGES USING LAMB WAVES |
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| Yan Gang,Zhou Li.DAMAGE DETECTION FOR COMPOSITE STRUCTURE UNDER TEMPERATURE CHANGES USING LAMB WAVES[J].Transactions of Nanjing University of Aeronautics & Astronautics,2011,28(3):231-239. |
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| Authors: | Yan Gang Zhou Li |
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| Institution: | Yan Gang,Zhou Li(College of Aerospace Engineering,NUAA,29 Yudao Street,Nanjing,210016,P.R.China) |
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| Abstract: | A two-step method is proposed for detection and identification of invisible impact damage in composite structure under temperature changes using Lamb waves.First,a statistical outlier analysis is employed to distinguish whether the changes of Lamb wave signals are induced by damage within a monitoring area or are only affected by temperature changes.Damage indices are defined after the Lamb wave signals are processed by Fourier transform,and a Monte Carlo procedure is used to obtain the damage threshold val... |
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| Keywords: | structural health monitoring composite structure Lamb wave statistical outlier analysis probabilistic damage imaging temperature changes |
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