Experimental Research on the Health Monitoring of the Composite Patch System Using Lamb Waves

2013 ◽  
Vol 446-447 ◽  
pp. 1064-1068
Author(s):  
Yi Shan Zhang ◽  
Zun Wang ◽  
Zhi Wang
Keyword(s):  
Health Monitoring ◽  
Lamb Waves ◽  
Damage Index ◽  
Piezoelectric Sensor ◽  
Sensor Response ◽  
Piezoelectric Sensors ◽  
Integrity Assessment ◽  
Composite Patch ◽  
Lamb Wave Propagation ◽  
Composite Repairs

This paper describes an experimental study on the use of Lamb wave propagation for the integrity assessment of the composite patch system. Composite repairs are performed to the cracked specimen. Two piezoelectric sensors were installed around the composite patch. The piezoelectric sensor response was recorded periodically during the fatigue test. Three types of the damage index based upon the piezoelectric sensor response were selected and calculated to describe the health of the composite patch system. The results show that the damage index based upon the waveform relativity has the best correlations with the expanding process of the damage of the composite patch system.

scholarly journals Lamb Wave Directional Sensing with Piezoelectric Fiber Rosette in Structure Health Monitoring

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Songlai Wang ◽  
Wanrong Wu ◽  
Yiping Shen ◽  
Hui Li ◽  
Binlong Tang
Keyword(s):  
Wave Propagation ◽  
Health Monitoring ◽  
Lamb Wave ◽  
Estimation Method ◽  
Propagation Direction ◽  
Response Amplitude ◽  
Piezoelectric Sensors ◽  
Wave Propagation Direction ◽  
Lamb Wave Propagation ◽  
Piezoelectric Fiber

Directional piezoelectric sensors can detect the Lamb wave propagation direction to locate damage in structural health monitoring (SHM). The directivity of the round piezoelectric fiber is exploited with a 0°/45°/90° rosette configuration to acquire flexural Lamb wave signals. The directional response of the piezoelectric fiber under narrowband tone-burst excitation is theoretically deduced. Experimental tests are conducted to demonstrate the directivity and the frequency response property of the piezoelectric fiber under different excitation central frequencies in comparison with the MFC, rectangular piezoelectric sheet, and circular piezoelectric disc. Continuous wavelet transform (CWT) is applied to extract the maximum response amplitude information of the acquired Lamb wave signal at a central frequency. Experimental test results indicate that the piezoelectric fiber is capable to be used as a Lamb wave directional sensor than other piezoelectric sensors. A numerical estimation method for the Lamb wave propagation direction is proposed by defining an error function between the theoretical and experimental normalized response amplitude. The proposed method is generally applicable for different rosette configurations. Experimental results validate the accuracy of the proposed estimation method. The research results are significant to design or select the piezoelectric sensor to measure Lamb wave signals.

scholarly journals Wireless Energy Supply to Aircraft Structural Health Monitoring Nodes Using Ultrasonic Lamb Waves

2014 ◽  
Vol 2014 (6) ◽  
pp. 21-28 ◽  
Author(s):  
Aleksander Kural
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Lamb Waves ◽  
Sensor Nodes ◽  
Laser Vibrometer ◽  
Structural Health ◽  
Signal Laser ◽  
Plate Waves ◽  
Lamb Wave Propagation ◽  
Further Development

Abstract This article is based on research done during the author’s PhD at Cardiff University, UK. A prototype of a novel wireless energy transmission system aimed at the use with wireless aircraft structural health monitoring (SHM) sensor nodes is described. The system uses ultrasonic guided plate waves (Lamb waves) to transmit energy along an aluminium plate, similar to those used in aircraft structures. Three types of piezoelectric transducers generating and receiving the ultrasonic vibration were compared. The Smart Material MFC M8528-P1 was found to achieve the best performance, allowing the transmission of 17 mW across a 54 cm distance, while being driven with a 20 V signal. Laser vibrometer imaging and LISA software simulation of the Lamb wave propagation in the experimental plate were also performed. Based on these, ideas for a further development of the system were proposed.

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.

Propagation Characteristics of Lamb Waves in Stringer-Stiffened Panels

2007 ◽  
Vol 334-335 ◽  
pp. 637-640
Author(s):  
Chun Hui Yang ◽  
Zhong Qing Su ◽  
Lin Ye ◽  
Ye Lu ◽  
Michael Bannister
Keyword(s):  
Health Monitoring ◽  
Lamb Wave ◽  
Structural Integrity ◽  
Damage Identification ◽  
Lamb Waves ◽  
Stiffened Plate ◽  
Propagation Characteristics ◽  
Stiffened Panels ◽  
Geometric Configurations ◽  
Lamb Wave Propagation

Stringer-stiffened plate-like structure is a typical engineering structure and its structural integrity is critical. A guided Lamb wave-based damage identification scheme and an online structural health monitoring (SHM) system with an integrated PZT-sensor network were developed. In the previous studies, the specimens were relatively simple. In this paper, the abovementioned method was extended to the stiffened plate-like structure—a flat plate reinforced by stringer. FE dynamic simulation was applied to investigate the Lamb wave propagation characteristics due to the existence of stringer with the consideration of its material and geometric configurations.

scholarly journals Piezoelectric Sensors for Lamb Waves’ Direction of Arrival (DoA) Estimation

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 806 ◽  
Author(s):  
Luca De Marchi ◽  
Marco Dibiase ◽  
Nicola Testoni
Keyword(s):  
Radon Transform ◽  
Lamb Waves ◽  
Design Procedure ◽  
Direction Of Arrival ◽  
Piezoelectric Sensor ◽  
Doa Estimation ◽  
Piezoelectric Sensors ◽  
Time Of Arrival ◽  
The Difference ◽  
Novel Strategy

A novel strategy to design piezoelectric sensor clusters suited for direction of arrival (DoA) estimation of Lamb waves is presented in this work. The designed clusters are composed by three piezoelectric patches (P1, P2 e P3) to be bonded on the structure to be inspected. In particular, by exploiting the Radon Transform, the proposed sensor design procedure computes the shape of P2 given the shape of P1 so that the difference in time of arrival (DToA) of the Lamb waves at the two patches is linearly related to the DoA. Such properties allow to minimize the DoA uncertainty. The sensor P3 is designed to perform the estimation of DoA without knowing the actual wave velocity. Numerical results show that DoA is extremely robust.

Development of PZT fiber rosette to locate acoustic source

2021 ◽  
pp. 1045389X2199192
Author(s):  
Bao Chi Ha ◽  
Kevin Gilbert ◽  
Gang Wang
Keyword(s):  
Lead Zirconate Titanate ◽  
Health Monitoring ◽  
Lamb Wave ◽  
Lead Zirconate ◽  
Acoustic Source ◽  
Mechanical Coupling ◽  
Monitoring Applications ◽  
Commercial Off The Shelf ◽  
Lamb Wave Propagation ◽  
Strain Direction

Because of their electro-mechanical coupling property, Lead-Zirconate-Titanate (PZT) materials have been widely used for ultrasonic wave sensing and actuation in structural health monitoring applications. In this paper, a PZT rosette concept is proposed to conduct Lamb wave-based damage detection in panel-like structures by exploring its best directional sensing capability. First, a directivity study was conducted to investigate sensing of flexural Lamb wave propagation using a PZT fiber having d33 effects. Then, commercial off-the-shelf PZT fibers were polarized in-house in order to construct the PZT rosette configuration, in which three PZT fibers are oriented at 0°, 45°, 90°, respectively. Since Lamb wave responses are directly related to measured PZT fiber voltage signals, a simple interrogation scheme was developed to calculate principal strain direction in order to locate an acoustic source. Comprehensive tests were conducted to evaluate the performance of the proposed PZT rosette using an aluminum plate. It is shown that the PZT rosette is able to sense Lamb wave responses and accurately locate an acoustic source. We expect to further evaluate the PZT rosette performance when damages are introduced.

A simplified framework for prediction of sensor network coverage in real-time structural health monitoring of plate-like structures

2021 ◽  
pp. 147592172110332
Author(s):  
Mehrdad Ghyabi ◽  
Hamidreza Nemati ◽  
Ehsan Dehghan-Niri
Keyword(s):  
Finite Element ◽  
Sensor Network ◽  
Health Monitoring ◽  
Surface Crack ◽  
Piezoelectric Sensor ◽  
Network Coverage ◽  
Coverage Area ◽  
Fem Simulations ◽  
Network Geometry ◽  
Critical Defect

In this article, the coverage area prediction of piezoelectric sensor network for detecting a specific type of under-surface crack in plate-like structures is addressed. In particular, this article proposes a simplified framework to estimate the coverage of any given sensor network arrangement when a critical defect is known. Based on numerical results from finite element methods (FEM), a simplified framework to estimate coverage area of any given network arrangement is developed. Using such a simplified framework, one can avoid time-consuming procedure of evaluating numerous FEM models in estimating sensor network coverage. Back-scatter fields of partial cracks are estimated using a proposed function, whose parameters are estimated from the results of a limited number of FEM simulations. The proposed function efficiently predicts the back-scattered field of any combination of transmitters and receivers for a given crack geometry. Superposition is used to estimate the coverage area of an arbitrary piezoelectric (e.g., PZT) sensor network. It is shown that the coverage area of a sensor network depends on both sensor network geometry and defect properties (e.g., crack inclination) and it is not necessarily a linear function of the number of sensors. Furthermore, it is shown that the network arrangement has an important effect on the geometry of the coverage area. Experimental results of a network of 14 PZTs in two clusters confirm the accuracy of the method.

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