scholarly journals Integrated Structural Health Assessment Using Piezoelectric Active Sensors

2005 ◽  
Vol 12 (6) ◽  
pp. 389-405 ◽  
Author(s):  
Jeannette R. Wait ◽  
Gyuhae Park ◽  
Charles R. Farrar
Keyword(s):  
Lamb Wave ◽  
Structural Damage ◽  
Structural Integrity ◽  
Damage Identification ◽  
Wave Attenuation ◽  
Health Assessment ◽  
Mechanical Impedance ◽  
Integrated Approach ◽  
Impedance Method ◽  
Sensing Technology

This paper illustrates an integrated approach for identifying structural damage. The method presented utilizes piezoelectric (PZT) materials to actuate/sense the dynamic response of the structures. Two damage identification techniques are integrated in this study, including impedance methods and Lamb wave propagations. The impedance method monitors the variations in structural mechanical impedance, which is coupled with the electrical impedance of the PZT patch. In Lamb wave propagations, one PZT patch acting as an actuator launches an elastic wave through the structure, and responses are measured by an array of PZT sensors. The changes in both wave attenuation and reflection are used to detect and locate the damage. Both the Lamb wave and impedance methods operate in high frequency ranges at which there are measurable changes in structural responses even for incipient damage such as small cracks, debonding, or loose connections. The combination of the local impedance method with the wave propagation based approach allows a better characterization of the system’s structural integrity. The paper concludes with experimental results to demonstrate the feasibility of this integrated active sensing technology.

Lamb-Wave-Based Damage Identification in Laminated Composite Plates

2014 ◽  
Vol 1014 ◽  
pp. 3-8
Author(s):  
Zai Lin Yang ◽  
Hamada M. Elgamal ◽  
Jian Wei Zhang
Keyword(s):  
Lamb Wave ◽  
Structural Damage ◽  
Damage Identification ◽  
Lamb Waves ◽  
Laminated Composite ◽  
Composite Plates ◽  
High Sensitivity ◽  
Scattered Wave ◽  
Propagation Path ◽  
Laminated Composite Plates

With advantages including capability of propagation over a significant distance and high sensitivity to abnormalities and inhomogeneity near the wave propagation path, Lamb waves can be energised to disseminate in a structure and any changes in material properties or structural geometry created by a discontinuity, boundary or structural damage can be identified by examining the scattered wave signals. This paper presents an overview of the Lamb-wave-based damage identification in laminated composite plates including the formulation of lamb waves in an isotropic plate.

Structural Assessment System for Damage and Degradation: Two-Stage Damage Identification Based on Neural Networks and Improved MDLAC Method

2004 ◽  
Author(s):  
Koji Tsuchimoto ◽  
Naoaki Wada ◽  
Yoshikazu Kitagawa
Keyword(s):  
Neural Networks ◽  
Monitoring System ◽  
Structural Damage ◽  
Structural Integrity ◽  
Damage Identification ◽  
Diagnostic System ◽  
Structural Condition ◽  
Smart Structure ◽  
Assessment System ◽  
Detection Methods

A “smart” structure has many functions, including monitoring, repairing, shape formation, and learning. Recently, interest in applying a monitoring system to structures for quality assurance and for evaluating seismic risk has been strong. Monitoring system is useful to diagnose the structural condition, and detect structural damage and degradation. In this study, we developed a monitoring system to assess the structural integrity. This system includes a diagnostic system for structural damage and degradation based on neural networks and improved MDLAC method, say, to detect the damage sites globally by applying neural networks and then to narrow the damage sites by using improved MDLAC method. To validate this system, we then use the 5-story structure in which the beams are fixed at both ends in order to confirm the performance of our proposal damage detection methods. As a result, it is pointed out that there are some possibilities to confirm the diagnostic system by utilizing these two methods.

scholarly journals Sensor Fault Diagnosis for Impedance Monitoring Using a Piezoelectric-Based Smart Interface Technique

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 510 ◽  
Author(s):  
Thanh-Canh Huynh ◽  
The-Duong Nguyen ◽  
Duc-Duy Ho ◽  
Ngoc-Loi Dang ◽  
Jeong-Tae Kim
Keyword(s):  
Fault Diagnosis ◽  
Structural Damage ◽  
Structural Integrity ◽  
Damage Identification ◽  
Analytical Investigation ◽  
Successful Implementation ◽  
Sensor Fault ◽  
Impedance Model ◽  
Integrity Assessment ◽  
Impedance Monitoring

For a structural health monitoring (SHM) system, the operational functionality of sensors is critical for successful implementation of a damage identification process. This study presents experimental and analytical investigations on sensor fault diagnosis for impedance-based SHM using the piezoelectric interface technique. Firstly, the piezoelectric interface-based impedance monitoring is experimentally conducted on a steel bolted connection to investigate the effect of structural damage and sensor defect on electromechanical (EM) impedance responses. Based on the experimental analysis, sensor diagnostic approaches using EM impedance features are designed to distinguish the sensor defect from the structural damage. Next, a novel impedance model of the piezoelectric interface-driven system is proposed for the analytical investigation of sensor fault diagnosis. Various parameters are introduced into the EM impedance formulation to model the effect of shear-lag phenomenon, sensor breakage, sensor debonding, and structural damage. Finally, the proposed impedance model is used to analytically estimate the change in EM impedance responses induced by the structural damage and the sensor defect. The analytical results are found to be consistent with experimental observations, thus evidencing the feasibility of the novel impedance model for sensor diagnosis and structural integrity assessment. The study is expected to provide theoretical and experimental foundations for impedance monitoring practices, using the piezoelectric interface technique, with the existence of sensor faults.

Structural Damage Identification by Detection Medium Technology

2013 ◽  
Vol 401-403 ◽  
pp. 1493-1498
Author(s):  
Zhen Fu Chen ◽  
Zhong You Wang ◽  
Jun Liu
Keyword(s):  
Structural Damage ◽  
Structural Integrity ◽  
Infrared Imaging ◽  
Damage Identification ◽  
Wave Theory ◽  
Pulse Method ◽  
Ultrasonic Pulse ◽  
Structural Testing ◽  
Destructive Testing ◽  
Detection Medium

There are two conventional techniques i.e. the approach based on structural testing and non-damaged detecting method, of which the former is partial to structural integrity analysis while the latter focuses on partial detection. The damage identification approach is discussed from the perspective of detection medium in the paper. And non-destructive testing in civil engineering (NDT-CE), of which the research status and existing issues are presented, can be attributed into three categories as following: one is based on the stress wave theory, such as impact-echo method, acoustic emission technique and ultrasonic pulse method; one employs the mechanism of electromagnetic wave propagation on behalf of GPR; one uses radiography as the medium, for instance, infrared imaging and computerized tomography. It is emphasized that ground penetrating radar (GPR) has been applied in practice and studied more and more, and moreover, the prospects in the field are provided.

scholarly journals VIBRATION-BASED STRUCTURAL DAMAGE DETECTION TECHNIQUES: A REVIEW

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Akpabot Akpabot ◽  
Anthony Ede ◽  
Oluwarotimi Olofinnade ◽  
Abimbola Odetoyan
Keyword(s):  
Damage Detection ◽  
Structural Damage ◽  
Structural Integrity ◽  
Damage Identification ◽  
Practical Application ◽  
Engineering Structures ◽  
Detection Techniques ◽  
The Time Domain ◽  
Stiffness And Damping ◽  
Early Damage

Damage in infrastructure can be as a result of its degenerating state under service loads or after exposure to impact loads such as earthquakes. Early damage detection is essential to preventing failure and ensure the integrity and safety of structures. Damages lead to changes in the geometric and material properties like mass, stiffness, and damping, and influences the response behavior of the structure. It has been proven that vibration-based damage detection technique is an efficient means of damage identification and assessing structural integrity. This review article examines conventional vibration-based damage detection techniques. It highlights the importance of early damage detection as a means of ensuring infrastructural safety, reliability and maintenance. Damage detection techniques like the time domain methods, frequency domain and modal domain methods have been developed and constantly evolving to meet the existing challenge of identifying structural damages. The practical application is still minimal, hence more research works are necessary for damage detection in large civil engineering structures.

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 Monitoring of Grouting Compactness in Tendon Duct Using Multi-Sensing Electro-Mechanical Impedance Method

2020 ◽  
Vol 10 (6) ◽  
pp. 2018 ◽  
Author(s):  
Bin Guo ◽  
Dongdong Chen ◽  
Linsheng Huo ◽  
Gangbing Song
Keyword(s):  
Lead Zirconate Titanate ◽  
Prestressed Concrete ◽  
Processing Time ◽  
Structural Integrity ◽  
Physical Property ◽  
Mechanical Impedance ◽  
Lead Zirconate ◽  
Measurement Procedure ◽  
Impedance Method ◽  
Single Measurement

The structural integrity of post-tensioning prestressed concrete structures with tendon ducts highly depends on the grouting quality in construction. This paper proposes a real-time approach to monitoring the grouting compactness in tendon ducts using the multi-sensing electro-mechanical impedance (EMI) method. When Lead Zirconate Titanate (PZT) transducers with different pre-selected dimensions are serially connected and mounted on a structure at distributed locations, each PZT provides unique resonance frequency coupled with the local structural physical property. Therefore, the impedance with multiple peaks of the serially connected multiple PZTs can be captured during a single measurement, which significantly simplifies the measurement procedure and reduces the data processing time. In addition, the wiring for the PZT sensors is also simplified. In this research, the feasibility of the proposed method was experimentally and numerically investigated to monitor the grouting compactness in a tendon duct specimen. The 3-dB mean absolute percentage deviation (MAPD) was applied to quantify the variations of the impedance signatures measured from five different grouting levels. Both experimental and numerical results verify the feasibility of using the proposed method for monitoring the grouting compactness in tendon ducts.

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