基于EEMD和归一化IMF能量差的结构损伤识别
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摘要
针对结构损伤受外界环境因素影响、损伤指标不敏感等导致的结构识别困难问题,提出了一种基于EEMD和归一化IMF能量差的结构损伤识别新方法。首先对各传感器采集到的原信号进行EEMD分解得到多个IMF分量,再对各测点分解后的IMF分量进行能量的计算并进行归一化处理,求出与未损伤前各测点IMF分量的归一化能量差值,以结构损伤前后信号的EEMD分解后的IMF分量归一化能量差值作为结构损伤敏感因子构建各状态下的变化曲线,直观的判断结构损伤的位置。对三层框架模型结构和简支梁结构进行分析,结果表明该方法可以准确判断结构损伤的发生。
Aiming at the problem that the influence of environmental factors and insensitive damage indicators make structural damage identification difficult,a new method of structural damage identification based on EEMD and normalized energy difference of IMF was proposed. First,a group of IMF components of original signal was obtained by EEMD. The energy of IMF components of each measured point was calculated and normalized,The difference between the normalized energy of IMF components before and after damage was obtained. The change curve of each state was constructed by using the difference as the structural damage indicator and conclude the damage location and degree through comparing before and after structural damage.Finally,a series of the experimental data from a three-story building structure and simply supported beam were analyzed to validate the viewpoints in this paper. Results indicate that the method is effective.
Aiming at the problem that the influence of environmental factors and insensitive damage indicators make structural damage identification difficult,a new method of structural damage identification based on EEMD and normalized energy difference of IMF was proposed. First,a group of IMF components of original signal was obtained by EEMD. The energy of IMF components of each measured point was calculated and normalized,The difference between the normalized energy of IMF components before and after damage was obtained. The change curve of each state was constructed by using the difference as the structural damage indicator and conclude the damage location and degree through comparing before and after structural damage.Finally,a series of the experimental data from a three-story building structure and simply supported beam were analyzed to validate the viewpoints in this paper. Results indicate that the method is effective.
引文
[1]朱宏平,余璟,张俊兵.结构损伤动力检测与健康监测研究现状与展望[J].工程力学,2011,28(2):1-11.ZHU Hong Ping,YU Jing,ZHANG Jun Bing.A summary review and advantages of vibration-based damage identification methods in structural health monitoring[J].Engineering Mechanics,2011,28(2):1-11(In Chinese).
[2]张兆德,王德禹.基于模态参数的海洋平台损伤检测[J].振动与冲击,2004,23(3):5-10.ZHANG Zhao De,WANG De Yu.Study on crack detection using modal parameters of a damaged jacket platform[J].Journal of Vibration and Shock,2004,23(3):5-10(In Chinese).
[3]万小朋,李小聪,鲍凯,等.利用振型变化进行结构损伤诊断的研究[J].航空学报,2003,24(5):422-426.WAN Xiao Peng,LI Xiao Cong,BAO Kai,et al.Structure damage diagnosis based on analyzing changes of vibration mode[J].Acta Aeronautica Et Astronautica Sinica,2003,24(5):422-426(In Chinese).
[4]Yoon M,Heider D,Gillespie Jr J,et al.Local damage detection using the two-dimensional gapped smoothing method[J].Journal of Sound and Vibration,2005,279(1):119-139.
[5]綦宝晖,邬瑞锋,蔡贤辉,等.一种桁架结构损伤识别的柔度阵法[J].计算力学学报,2001,18(1):42-47.QI Bao Hui,WU Rui Feng,CAI Xian Hui,et al.A flexibility matrix method for damage identification of truss structure[J].Chinese Journal of Computational Mechanics,2001,18(1):42-47(In Chinese).
[6]王天辉,马立元,贾继文,等.基于灰并联模态柔度曲率差的梁结构损伤识别[J].中国机械工程,2012,23(7):790-793.WANG Tian Hui1,MA Li Yuan,JIA Ji Wen,et al.Damage identification of a beam-type based on grey relation modal flexibility curvature difference(GMFCD)[J].China Mechanical Engineering,2012,23(7):790-793(In Chinese).
[7]王世龙,王丽娜,蔡永辉,等.基于小波分析的滚动轴承摩擦副表面损伤故障诊断系统[J].仪表技术与传感器,2010(11):99-101.WANG Shi Long WANG Li Na,CAI Yong Hui,et al.Fault diagnosis system of rolling bearing with surface damage in friction pair based on wavelet analysis[J].Instrument Technique and Sensor,2010(11):99-101(In Chinese).
[8]丁幼亮,李爱群,姚晓征.动载测试与小波分析在桥梁结构损伤诊断中的联合应用[J].振动工程学报,2006,19(4):499-504.DING You Liang,LI Ai Qun,YAO Xiao Zheng.Combined application of dynamic loading testing and wavelet analysis on damage assessment of bridge structures[J].Journal of Vibration Engineering,2006,19(4):499-504(In Chinese).
[9]柴凯,张梅军,黄杰,等.一种抑制EEMD端点效应的改SVR方法[J].机械强度,2015(6):1017-1022.CHAI Kai,ZHANG Mei Jun,HUANG Jie,et al.Approach to depress the boundary effect in EEMD analysis based on improved SVR[J].Journal of Mechanical Strength,2015(6):1017-1022(In Chinese).
[10]陈灏,张梅军,黄杰,等.液压系统故障特征提取方法研究[J].机械强度,2015,37(3):408-412.CHEN Hao,ZHANG Mei Jun,HUANG Jie,et al.Fault feature extraction of hydraulic system[J].Journal of Mechanical Strength,2015,37(3):408-412(In Chinese).
[11]Figueiredo E,Park G,Figueiras J,et al.Structural health monitoring algorithm comparisons using standard data sets[R].Los Alamos National Laboratory(LANL),Los Alamos,NM(United States),2009:6-12.
[12]陈淮,李静斌,殷学纲.一种新的结构损伤识别试验方法研究[J].实验力学,2011(1):96-102.CHEN Huai,LI Jing Bin,YIN Xue Gang.On a new experimental method for structural damage identification[J].Journal of Experimental Mechanics,2011(1):96-102(In Chinese).
[2]张兆德,王德禹.基于模态参数的海洋平台损伤检测[J].振动与冲击,2004,23(3):5-10.ZHANG Zhao De,WANG De Yu.Study on crack detection using modal parameters of a damaged jacket platform[J].Journal of Vibration and Shock,2004,23(3):5-10(In Chinese).
[3]万小朋,李小聪,鲍凯,等.利用振型变化进行结构损伤诊断的研究[J].航空学报,2003,24(5):422-426.WAN Xiao Peng,LI Xiao Cong,BAO Kai,et al.Structure damage diagnosis based on analyzing changes of vibration mode[J].Acta Aeronautica Et Astronautica Sinica,2003,24(5):422-426(In Chinese).
[4]Yoon M,Heider D,Gillespie Jr J,et al.Local damage detection using the two-dimensional gapped smoothing method[J].Journal of Sound and Vibration,2005,279(1):119-139.
[5]綦宝晖,邬瑞锋,蔡贤辉,等.一种桁架结构损伤识别的柔度阵法[J].计算力学学报,2001,18(1):42-47.QI Bao Hui,WU Rui Feng,CAI Xian Hui,et al.A flexibility matrix method for damage identification of truss structure[J].Chinese Journal of Computational Mechanics,2001,18(1):42-47(In Chinese).
[6]王天辉,马立元,贾继文,等.基于灰并联模态柔度曲率差的梁结构损伤识别[J].中国机械工程,2012,23(7):790-793.WANG Tian Hui1,MA Li Yuan,JIA Ji Wen,et al.Damage identification of a beam-type based on grey relation modal flexibility curvature difference(GMFCD)[J].China Mechanical Engineering,2012,23(7):790-793(In Chinese).
[7]王世龙,王丽娜,蔡永辉,等.基于小波分析的滚动轴承摩擦副表面损伤故障诊断系统[J].仪表技术与传感器,2010(11):99-101.WANG Shi Long WANG Li Na,CAI Yong Hui,et al.Fault diagnosis system of rolling bearing with surface damage in friction pair based on wavelet analysis[J].Instrument Technique and Sensor,2010(11):99-101(In Chinese).
[8]丁幼亮,李爱群,姚晓征.动载测试与小波分析在桥梁结构损伤诊断中的联合应用[J].振动工程学报,2006,19(4):499-504.DING You Liang,LI Ai Qun,YAO Xiao Zheng.Combined application of dynamic loading testing and wavelet analysis on damage assessment of bridge structures[J].Journal of Vibration Engineering,2006,19(4):499-504(In Chinese).
[9]柴凯,张梅军,黄杰,等.一种抑制EEMD端点效应的改SVR方法[J].机械强度,2015(6):1017-1022.CHAI Kai,ZHANG Mei Jun,HUANG Jie,et al.Approach to depress the boundary effect in EEMD analysis based on improved SVR[J].Journal of Mechanical Strength,2015(6):1017-1022(In Chinese).
[10]陈灏,张梅军,黄杰,等.液压系统故障特征提取方法研究[J].机械强度,2015,37(3):408-412.CHEN Hao,ZHANG Mei Jun,HUANG Jie,et al.Fault feature extraction of hydraulic system[J].Journal of Mechanical Strength,2015,37(3):408-412(In Chinese).
[11]Figueiredo E,Park G,Figueiras J,et al.Structural health monitoring algorithm comparisons using standard data sets[R].Los Alamos National Laboratory(LANL),Los Alamos,NM(United States),2009:6-12.
[12]陈淮,李静斌,殷学纲.一种新的结构损伤识别试验方法研究[J].实验力学,2011(1):96-102.CHEN Huai,LI Jing Bin,YIN Xue Gang.On a new experimental method for structural damage identification[J].Journal of Experimental Mechanics,2011(1):96-102(In Chinese).