Health monitoring using Lamb waves. Application to the characterization of low impacts in aerospace structures

2002 ◽  
Vol 112 (5) ◽  
pp. 2354-2354
Author(s):  
Sebastien Grondel ◽  
Jamal Assaad ◽  
Christophe Delebarre
Keyword(s):  
Health Monitoring ◽  
Lamb Waves ◽  
Aerospace Structures

scholarly journals Characterization of Nonplanar Second Harmonic Lamb Waves With a Refined Nonlinear Parameter

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Shengbo Shan ◽  
Li Cheng ◽  
Fuzhen Wen
Keyword(s):  
Health Monitoring ◽  
Wave Attenuation ◽  
Lamb Waves ◽  
Second Harmonic ◽  
Nonlinear Parameter ◽  
Cumulative Effects ◽  
Dominance Level ◽  
Nonlinear Components ◽  
Wave Divergence

Structural health monitoring (SHM) methods based on the cumulative second harmonic Lamb waves show attractive advantages. An ideal nonlinear parameter should allow precise characterization of the cumulative effects of the distributed nonlinear sources such as the material nonlinearity of a plate (MNP), in the presence of other unavoidable localized nonlinear components. While highlighting the deficiencies of the traditional nonlinear parameter (TNP) in the nonplanar cases, a refined nonlinear parameter (RNP) is proposed. Through compensations for the wave attenuation associated with the wave divergence, the new parameter entails a better characterization and differentiation of the cumulative MNP and other noncumulative localized nonlinear sources. Theoretical findings are ascertained by both finite element (FE) simulations and experiments, through tactically adjusting the dominance level of different nonlinear sources in the system. Results confirm the appealing features of the proposed RNP for SHM applications.

The Delay Multiply and Sum Algorithm for Lamb Waves Based Structural Health Monitoring

2021 ◽  
pp. 657-666
Author(s):  
Michelangelo Maria Malatesta ◽  
Denis Bogomolov ◽  
Marco Messina ◽  
Dennis D’Ippolito ◽  
Nicola Testoni ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Lamb Waves ◽  
Structural Health

Damage Identification by Embedded Piezoceramic Sensors in the Composite Plate

2006 ◽  
Vol 326-328 ◽  
pp. 1697-1700
Author(s):  
Heoung Jae Chun ◽  
Choong Hee Yi ◽  
Joon Hyung Byun
Keyword(s):  
Monitoring System ◽  
Health Monitoring ◽  
Composite Laminates ◽  
Damage Identification ◽  
Lamb Waves ◽  
Structural Systems ◽  
Detection Accuracy ◽  
Health Monitoring System ◽  
Localized Defects ◽  
The Many

The embedded structural health monitoring system is envisioned to be an important factor of future structural systems. One of the many attractions of in situ health monitoring system is its capability to inspect the structural systems in less intrusive way over many other visual inspections which require disassembly of built up structures when some indications have appeared that damages have occurred in the structural systems The vacuum assisted resin transfer molding (VARTM) process is used to fabricate woven-glass/phenol composite specimens which have the PZT sensor array embedded in them. The embedded piezoceramic (PZT) sensors are used as both transmitters and receivers. A damage identification approach is developed for a woven-glass/phenol composite laminates with known localized defects. Propagation of the Lamb waves in laminates and their interactions with the defects are examined. Lamb waves are generated by the high power ultrasonic analyzer. A real time active diagnosis system is therefore established. The results obtained show that satisfactory detection accuracy could be achieved by proposed method.

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