Time Reversal Health Monitoring of Composite Plates using Lamb waves

2011 ◽  
Vol 3 (3) ◽  
pp. 131-142 ◽  
Author(s):  
R. Gangadharan ◽  
C. Murthy ◽  
S. Gopalakrishnan ◽  
M. Bhat
Keyword(s):  
Health Monitoring ◽  
Time Reversal ◽  
Lamb Waves ◽  
Composite Plates

A time reversal damage imaging method for structure health monitoring using Lamb waves

2010 ◽  
Vol 19 (11) ◽  
pp. 114301 ◽  
Author(s):  
Hai-Yan Zhang ◽  
Ya-Ping Cao ◽  
Xiu-Li Sun ◽  
Xian-Hua Chen ◽  
Jian-Bo Yu
Keyword(s):  
Health Monitoring ◽  
Time Reversal ◽  
Lamb Waves ◽  
Imaging Method ◽  
Structure Health Monitoring ◽  
Damage Imaging

Damage Detectability Model of Pitch-Catch Configuration in Composite Plates

2017 ◽  
Vol 754 ◽  
pp. 387-390 ◽  
Author(s):  
Nan Yue ◽  
Zahra Sharif Khodaei ◽  
Ferri M.H. Aliabadi
Keyword(s):  
Wave Propagation ◽  
Damage Detection ◽  
Health Monitoring ◽  
Lamb Waves ◽  
Composite Plates ◽  
Detection Algorithm ◽  
Probability Of Detection ◽  
Operational Conditions ◽  
Proposed Model ◽  
Lamb Wave Propagation

Detectability of damage using Lamb waves depends on many factors such as size and severity of damage, attenuation of the wave and distance to the transducers. This paper presents a detectability model for pitch-catch sensors configuration for structural health monitoring (SHM) applications. The proposed model considers the physical properties of lamb wave propagation and is independent of damage detection algorithm, which provides a generic solution for probability of detection. The applicability of the model in different environmental and operational conditions is also discussed.

Time reversal technique for health monitoring of metallic structure using Lamb waves

Ultrasonics ◽  
2009 ◽  
Vol 49 (8) ◽  
pp. 696-705 ◽  
Author(s):  
R. Gangadharan ◽  
C.R.L. Murthy ◽  
S. Gopalakrishnan ◽  
M.R. Bhat
Keyword(s):  
Health Monitoring ◽  
Time Reversal ◽  
Lamb Waves ◽  
Metallic Structure

Structural Health Monitoring of Composite Structures Using Guided Lamb Waves

2006 ◽  
Vol 321-323 ◽  
pp. 759-764 ◽  
Author(s):  
Krishnan Balasubramaniam ◽  
B.V. Soma Sekhar ◽  
J. Vishnu Vardan ◽  
C.V. Krishnamurthy
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Composite Structures ◽  
Lamb Waves ◽  
Impact Damage ◽  
Composite Plates ◽  
Structural Features ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Structural Health

Structural Health Monitoring (SHM) of aircrafts is of great relevance in the present age aircraft industry. The present study demonstrates three techniques that have the potential for the SHM of multi-layered composite structures. The first technique is based on multi-transmitter-multireceiver (MTMR) technique with tomographic methods used for data reconstruction. In the MTMR, the possibility of SHM using algebraic reconstruction techniques (ART) for tomographic imaging with Lamb wave data measured in realistic materials is examined. Defects (through holes and low velocity impact delaminations) were synthetic and have been chosen to simulate impact damage in composite plates. The second technique is a single-transmitter-multi-receiver (STMR) technique that is more compact and uses reconstruction techniques that are analogous to synthetic aperture techniques. The reconstruction algorithm uses summation of the phase shifted signals to image the location of defects, portions of the plate edges, and any reflectors from inherent structural features of the component. The third technique involves a linear array of sensors across a stiffener for the detection of disbanded regions.

Focusing of Time Reversal Lamb Waves and Its Applications in Structural Health Monitoring

2010 ◽  
Vol 27 (10) ◽  
pp. 104301 ◽  
Author(s):  
Zhang Hai-Yan ◽  
Chen Xian-Hua ◽  
Cao Ya-Ping ◽  
Yu Jian-Bo
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Time Reversal ◽  
Lamb Waves ◽  
Structural Health

An improved time reversal method for diagnostics of composite plates using Lamb waves

2018 ◽  
Vol 190 ◽  
pp. 10-19 ◽  
Author(s):  
Liping Huang ◽  
Liang Zeng ◽  
Jing Lin ◽  
Zhi Luo
Keyword(s):  
Time Reversal ◽  
Lamb Waves ◽  
Composite Plates

scholarly journals Broadband signal reconstruction for SHM: An experimental and numerical time reversal methodology

2021 ◽  
pp. 1045389X2097247
Author(s):  
Francesco Falcetelli ◽  
Nicolas Venturini ◽  
Maria Barroso Romero ◽  
Marcias J Martinez ◽  
Shashank Pant ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Health Monitoring ◽  
Time Reversal ◽  
Narrow Band ◽  
Lamb Waves ◽  
Signal Reconstruction ◽  
Broad Band ◽  
Absorbing Boundaries ◽  
Broadband Signal ◽  
Pencil Lead

Structural Health Monitoring (SHM) aims to shift aircraft maintenance from a time-based to a condition-based approach. Within all the SHM techniques, Acoustic Emission (AE) allows for the monitoring of large areas by analyzing Lamb waves propagating in plate like structures. In this study, the authors proposed a Time Reversal (TR) methodology with the aim of reconstructing an original and unaltered signal from an AE event. Although the TR method has been applied in Narrow-Band (NwB) signal reconstruction, it fails when a Broad-Band (BdB) signal, such as a real AE event, is present. Therefore, a novel methodology based on the use of a Frequencies Compensation Transfer Function (FCTF), which is capable of reconstructing both NwB and real BdB signals, is presented. The study was carried out experimentally using several sensor layouts and materials with two different AE sources: (i) a Numerically Built Broadband (NBB) signal, (ii) a Pencil Lead Break (PLB). The results were validated numerically using Abaqus/CAETM with the implementation of absorbing boundaries to minimize edge reflections.

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