基于多频段时域滤波技术的超声导波延时叠加损伤成像方法
发布时间：2022-11-06 12:04
超声Lamb波具有传播距离远,对损伤敏感等优点,常用于板状结构的无损评估（NDE）和结构健康监测（SHM）。基于Lamb波的损伤定位成像方法的研究已成为SHM和NDE领域的研究热点。然而,Lamb波的频散特性使其在传播时产生拉伸和失真,将影响有关损伤散射信息的渡越时间的提取,从而导致损伤定位和成像的不准确;频散效应影响下入射信号和损伤散射信号的混叠也使得损伤特征信息的解读更为困难;此外,现有基于时域分析的损伤成像方法难以有效利用激励带宽内的全部频率成分所包含的有效损伤信息,因此成像精度受限。为此,本文提出基于多频段时域滤波的超声Lamb波散射信号分析方法,利用小波分析将宽频带的激励信号分解为多个频散特征较弱的窄带信号,进而构建时域滤波窗函数以分离各窄带信号中的损伤散射信息;分别对各窄带信号实施频域/空间延时叠加成像算法以获取针对板结构中的损伤成像;最终对各频率分量的成像结果综合分析（逻辑与）,以进一步提高损伤成像的精度和信噪比。建立预制损伤的铝板中超声Lamb波驱动,传播及损伤散射的有限元数值模型,基于数值模拟数据验证所提出多频段时域滤波超声信号处理方法和延时叠加损伤成像算法,指导建立...
【文章页数】：85 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
LIST OF SYMBOLS
CHAPTER1 INTRODUCTION
1.1 RESEARCH BACKGROUND
1.2 RESEARCH OF ULTRASONIC GUIDED WAVE BASED ARRAY IMAGING TECHNOLOGY
1.2.1 LAMB WAVE DAMAGE IMAGING METHOD
1.2.1.1 Time reversal imaging
1.2.1.2 Migration imaging method
1.2.1.3 Elliptical damage positioning method
1.2.1.4 Array beamforming damage imaging method
1.3 ULTRASONIC SIGNAL PROCESSING METHOD
1.3.1 TIME DOMAIN ANALYSIS
1.3.2 FREQUENCY WAVENUMBER DOMAIN ANALYSIS
1.3.3 INTEGRATED TIME DOMAIN-FREQUENCY DOMAIN ANALYSIS
1.4 RESEARCH OBJECTIVES AND NOVELTY
CHAPTER2 ULTRASONIC LAMB WAVE THEORY
2.1 ULTRASONIC LAMB WAVE
2.1.1 LAMB WAVE FORMATION MECHANISM
2.1.2 LAMB WAVE PROPAGATION CHARACTERISTICS
2.1.3 PHASE VELOCITY AND GROUP VELOCITY
2.1.4 DICHOTOMY METHOD TO SOLVE THE DISPERSION CURVES
2.2 ULTRASONIC SIGNAL PROCESSING METHOD
2.2.1 FREQUENCY WAVENUMBER DOMAIN ANALYSIS
2.2.2 WAVELET TRANSFORM
2.2.2.1 Wavelet basis selection
2.2.3 FREQUENCY BANDS AND TEMPORAL FILTERING METHOD
2.3 SUMMARY OF THIS CHAPTER
CHAPTER3 ULTRASONIC LAMB WAVE ARRAY BEAMFORMING AND DELAY AND SUM DAMAGE IMAGING METHOD
3.1 DELAY AND SUM DAMAGE IMAGING METHOD
3.1.1 TIME/PHASE DELAY AND SUM DAMAGE IMAGING METHOD
3.1.2 SPATIAL DELAY AND SUM DAMAGE IMAGING METHOD
3.2 LOGICAL OPERATIONS
3.3 RELATIVE ERROR
3.4 SUMMARY OF THIS CHAPTER
CHAPTER4 NUMERICAL STUDY ON DAMAGE IMAGING OF AN ALUMINUM
4.1 NUMERICAL SIMULATION PARAMETER SETTING AND MODEL ESTABLISHMENT
4.1.1 TIME STEP SIZE AND GRID SIZE
4.1.2 BOUNDARY CONDITIONS AND MODEL LOADS
4.1.3 WAVE FIELD DIAGRAM OF ULTRASONIC LAMB WAVE AT DIFFERENT TIMES
4.2 SIGNAL EXTRACTION AND DAMAGE IMAGING
4.2.1 MODEL ANALYSIS
4.2.2 DAMAGE IMAGING ANALYSIS
4.3 SUMMARY
CHAPTER5 EXPERIMENTAL STUDY ON DAMAGE IMAGING OF AN ALUMINUM PLATE
5.1 ULTRASONIC LAMB WAVE DAMAGE DETECTION EXPERIMENTAL PLATFORM
5.1.1 EXPERIMENTAL TEST PIECES AND DEVICES
5.1.2 POINT PLACEMENT IN THE EXPERIMENT
5.2 EXPERIMENTAL DAMAGE DETECTION PROCESS AND RESULTS
5.2.1 DAMAGE SCATTER SIGNAL EXTRACTION
5.2.2 ANALYSIS OF IMAGING RESULTS
5.3 CONCLUSION
CHAPTER6 CONCLUSION
REFERENCES
ACKNOWLEDGEMENTS
MAJOR PAPERS PUBLISHED DURING THE MASTER'S DEGREE
【参考文献】：
期刊论文
[1]表面状态对铝合金铸件荧光渗透检测的影响[J]. 王树志,刘广华,贾玉军,任学冬,乔海燕. 无损检测. 2016(02)
[2]与CRP相结合的SAFT在混凝土损伤检测成像中的研究[J]. 赵国旗,虞波,骆英,王自平. 实验力学. 2015(06)
[3]钢轨无损检测中的超声导波技术[J]. 周建民,徐清瑶,李鹏,万琪,廖晓苏. 仪表技术与传感器. 2015(06)
[4]板状结构中基于Lamb波单模态的缺陷成像试验研究[J]. 刘增华,徐营赞,何存富,吴斌. 工程力学. 2014(04)
[5]基于超声相控阵的材料结构健康监测实验研究[J]. 孙亚杰,袁慎芳,蔡建. 宇航学报. 2008(04)
本文编号：3703471
【文章页数】：85 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
LIST OF SYMBOLS
CHAPTER1 INTRODUCTION
1.1 RESEARCH BACKGROUND
1.2 RESEARCH OF ULTRASONIC GUIDED WAVE BASED ARRAY IMAGING TECHNOLOGY
1.2.1 LAMB WAVE DAMAGE IMAGING METHOD
1.2.1.1 Time reversal imaging
1.2.1.2 Migration imaging method
1.2.1.3 Elliptical damage positioning method
1.2.1.4 Array beamforming damage imaging method
1.3 ULTRASONIC SIGNAL PROCESSING METHOD
1.3.1 TIME DOMAIN ANALYSIS
1.3.2 FREQUENCY WAVENUMBER DOMAIN ANALYSIS
1.3.3 INTEGRATED TIME DOMAIN-FREQUENCY DOMAIN ANALYSIS
1.4 RESEARCH OBJECTIVES AND NOVELTY
CHAPTER2 ULTRASONIC LAMB WAVE THEORY
2.1 ULTRASONIC LAMB WAVE
2.1.1 LAMB WAVE FORMATION MECHANISM
2.1.2 LAMB WAVE PROPAGATION CHARACTERISTICS
2.1.3 PHASE VELOCITY AND GROUP VELOCITY
2.1.4 DICHOTOMY METHOD TO SOLVE THE DISPERSION CURVES
2.2 ULTRASONIC SIGNAL PROCESSING METHOD
2.2.1 FREQUENCY WAVENUMBER DOMAIN ANALYSIS
2.2.2 WAVELET TRANSFORM
2.2.2.1 Wavelet basis selection
2.2.3 FREQUENCY BANDS AND TEMPORAL FILTERING METHOD
2.3 SUMMARY OF THIS CHAPTER
CHAPTER3 ULTRASONIC LAMB WAVE ARRAY BEAMFORMING AND DELAY AND SUM DAMAGE IMAGING METHOD
3.1 DELAY AND SUM DAMAGE IMAGING METHOD
3.1.1 TIME/PHASE DELAY AND SUM DAMAGE IMAGING METHOD
3.1.2 SPATIAL DELAY AND SUM DAMAGE IMAGING METHOD
3.2 LOGICAL OPERATIONS
3.3 RELATIVE ERROR
3.4 SUMMARY OF THIS CHAPTER
CHAPTER4 NUMERICAL STUDY ON DAMAGE IMAGING OF AN ALUMINUM
4.1 NUMERICAL SIMULATION PARAMETER SETTING AND MODEL ESTABLISHMENT
4.1.1 TIME STEP SIZE AND GRID SIZE
4.1.2 BOUNDARY CONDITIONS AND MODEL LOADS
4.1.3 WAVE FIELD DIAGRAM OF ULTRASONIC LAMB WAVE AT DIFFERENT TIMES
4.2 SIGNAL EXTRACTION AND DAMAGE IMAGING
4.2.1 MODEL ANALYSIS
4.2.2 DAMAGE IMAGING ANALYSIS
4.3 SUMMARY
CHAPTER5 EXPERIMENTAL STUDY ON DAMAGE IMAGING OF AN ALUMINUM PLATE
5.1 ULTRASONIC LAMB WAVE DAMAGE DETECTION EXPERIMENTAL PLATFORM
5.1.1 EXPERIMENTAL TEST PIECES AND DEVICES
5.1.2 POINT PLACEMENT IN THE EXPERIMENT
5.2 EXPERIMENTAL DAMAGE DETECTION PROCESS AND RESULTS
5.2.1 DAMAGE SCATTER SIGNAL EXTRACTION
5.2.2 ANALYSIS OF IMAGING RESULTS
5.3 CONCLUSION
CHAPTER6 CONCLUSION
REFERENCES
ACKNOWLEDGEMENTS
MAJOR PAPERS PUBLISHED DURING THE MASTER'S DEGREE
【参考文献】：
期刊论文
[1]表面状态对铝合金铸件荧光渗透检测的影响[J]. 王树志,刘广华,贾玉军,任学冬,乔海燕. 无损检测. 2016(02)
[2]与CRP相结合的SAFT在混凝土损伤检测成像中的研究[J]. 赵国旗,虞波,骆英,王自平. 实验力学. 2015(06)
[3]钢轨无损检测中的超声导波技术[J]. 周建民,徐清瑶,李鹏,万琪,廖晓苏. 仪表技术与传感器. 2015(06)
[4]板状结构中基于Lamb波单模态的缺陷成像试验研究[J]. 刘增华,徐营赞,何存富,吴斌. 工程力学. 2014(04)
[5]基于超声相控阵的材料结构健康监测实验研究[J]. 孙亚杰,袁慎芳,蔡建. 宇航学报. 2008(04)
本文编号：3703471
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