scholarly journals Structural Health Monitoring of Large Structures Using Acoustic Emission–Case Histories

2019 ◽  
Vol 9 (21) ◽  
pp. 4602 ◽  
Author(s):  
Kanji Ono
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Case Histories ◽  
Structural Health ◽  
Large Structures

Acoustic emission (AE) techniques have successfully been used for assuring the structural integrity of large rocket motorcases since 1963 [...]

An acoustic emission-based approach to structural health monitoring of pre-stressed concrete railway sleepers

2020 ◽  
Vol 62 (5) ◽  
pp. 280-291
Author(s):  
M Carboni ◽  
A Collina ◽  
E Zappa
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Monitoring System ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Essential Element ◽  
Image Correlation ◽  
Damage Development ◽  
Safety Issues ◽  
Structural Health

Railway sleepers represent an essential element of the track; indeed, their structural integrity is closely related to important technical and safety issues. Today, periodical visual inspections are the only method applied to check the status of sleepers but are limited to visible surfaces, whereas the early detection of in-service cracks in the whole volume of sleepers would provide great advantages in terms of maintenance and management. The aim of the paper is to propose an acoustic emission (AE)-based structural health monitoring (SHM) approach that is able to detect the initiation and propagation of cracks in in-service pre-stressed concrete sleepers. The investigation is carried out in the laboratory, comparing the results obtained by acoustic emission monitoring and digital image correlation when subjecting pre-stressed concrete sleepers, taken from production, to both static and cyclic loads. The main points dealt with in the paper include the sensitivity of acoustic emission to detect damage development and the signal processing approach needed for defining effective damage indexes. Given the encouraging results, the paper is the first step in developing an affordable monitoring system, to be embedded into sleepers, that is able to be part of a complete track monitoring system.

scholarly journals A Novel Composite with Structural Health Monitoring Functionality via 2D and 3D Impedance Mapping Topography

2021 ◽  
Vol 11 (4) ◽  
pp. 1647
Author(s):  
Georgios Foteinidis ◽  
Alkiviadis S. Paipetis
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Carbon Fabric ◽  
Structural Health ◽  
The Matrix ◽  
Junction Points ◽  
Sinusoidal Electric Field ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

We report the transformation of a conventional composite material into a multifunctional structure able to provide information about its structural integrity. A purposely positioned grid of carbon fabric strips located within a glass fibre laminate in alternating 0/90 configuration combined with a ternary nanomodified epoxy matrix imparted structural health monitoring (SHM) topographic capabilities to the composite using the impedance spectroscopy (IS) technique. The matrix was reinforced with homogenously dispersed multi-walled carbon nanotubes (MWCNTs) and carbon black (CB). A sinusoidal electric field was applied locally over a frequency range from 1 Hz to 100 kHz between the junction points of the grid of carbon fabric strips. The proposed design enabled topographic damage assessment after a high-velocity impact via the local monitoring of the impedance. The data obtained from the IS measurements were depicted by magnitude and phase delay Bode plots and Nyquist plots. The impedance values were used to create a 2D and a multi-layer (3D) contour topographical image of the damaged area, which revealed crucial information about the structural integrity of the composite.

scholarly journals Fibre Bragg Grating Based Acoustic Emission Measurement System for Structural Health Monitoring Applications

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 897
Author(s):  
Sagar Jinachandran ◽  
Ginu Rajan
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Market Potential ◽  
Bragg Grating ◽  
Fibre Bragg Grating ◽  
Emission Measurement ◽  
Structural Health ◽  
Sensing Systems ◽  
Recent Trends

Fiber Bragg grating (FBG)-based acoustic emission (AE) detection and monitoring is considered as a potential and emerging technology for structural health monitoring (SHM) applications. In this paper, an overview of the FBG-based AE monitoring system is presented, and various technologies and methods used for FBG AE interrogation systems are reviewed and discussed. Various commercial FBG AE sensing systems, SHM applications of FBG AE monitoring, and market potential and recent trends are also discussed.

scholarly journals Diseño e implementación de un sistema de adquisición y monitoreo de datos (shm) para un rectificador de protección catódica usado en ductos.

Respuestas ◽  
2016 ◽  
Vol 21 (1) ◽  
pp. 45 ◽  
Author(s):  
Daniel Alejandro Rodríguez-Caro ◽  
Enrique Vera-López ◽  
Helver Mauricio Muñoz-Barajas
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Cathodic Protection ◽  
Structural Integrity ◽  
Protection System ◽  
Performance Criteria ◽  
Correct Operation ◽  
Structural Health ◽  
El Sistema ◽  
Cathodic Protection System

Antecedentes: La protección catódica por corriente impresa es uno de los métodos para prevenir la corrosión de tuberías o tanques, preservando el estado estructural y la integridad del material. Para que un sistema de protección catódica funcione correctamente debe existir un control sobre las variables eléctricas que intervienen en el proceso, es por ello que se hace necesario monitorear variables tales como (Voltaje, Corriente y Potencial de protección). Objetivo: De esta manera se desarrolla un sistema de adquisición y monitoreo de datos en tiempo real, con el propósito de aumentar la accesibilidad a las variables eléctricas y de esta forma mejorar el funcionamiento del sistema de protección catódica. Métodos: El sistema de monitoreo y análisis de la información se basa en el concepto de SHM (Structural Health Monitoring), el cual consta de; un sistema electrónico de adquisición y envío remoto de señales (micro controlador y sistema GSM de comunicaciones) y un sistema de visualización y análisis de la información en un sistema móvil (celular), usando un servidor web para ello. Teniendo en cuenta que la condición de integridad estructural del ducto está determinada por el correcto funcionamiento del rectificador. Resultados: se logró implementar un sistema de monitoreo y visualización remota de las variables principales de un sistema de protección catódica. Se desarrolló un algoritmo basado en el concepto de SHM, el cual permite correlacionar, generar tendencia y establecer criterios de funcionamiento del sistema de protección catódica que permiten establecer si el sistema está asegurando la integridad estructural del ducto de transporte de crudo. Conclusión: lo novedoso del presente trabajo consiste en mostrar el comportamiento en tiempo real de las variables necesarias para analizar si el ducto está siendo correctamente protegido y generar las alarmas e informes sobre protección catódica, lo cual es la base del concepto de SHM (Structural Health Monitoring).AbstractBackground: Cathodic protection by impressed current is one of the methods to prevent corrosion of pipes or tanks, preserving the structural state and integrity of the material. For a cathodic protection system to function properly there must to be a control over the electrical variables involved in the process, which is why it is necessary to monitor variables such as (voltage, current and potential protection). Objective: to develop a system of data acquisition and monitoring in real time, in order to increase accessibility to electrical variables and thus improve the operation of the cathodic protection system. Methods: The monitoring and information analysis system is based on the concept of SHM (Structural Health Monitoring), which consists of an electronic system for remote acquisition and sending of signals (micro controller and GSM communications system) and a system for visualization and analysis of information in a mobile system (cell) using a web server for it. Given that the condition of structural integrity of the pipeline is determined by the correct operation of the rectifier. Results: It was possible to implement a monitoring and remote viewing system of the main variables of a cathodic protection system. An algorithm based on the concept of SHM was developed, allowing to correlate, generate trend and establish performance criteria for the cathodic protection system which allows to establish whether the system is ensuring the structural integrity of the crude transportation pipeline. Conclusion: the novelty of this work is to show the realtime behavior of the variables needed to analyze whether the pipeline is being properly protected and generate alarms and reports regarding cathodic protection, which is based on the concept of SHM (Structural Health Monitoring).Palabras Clave: corriente, corrosión, Innovación, monitoreo, SHM (Structural Health Monitoring)

scholarly journals Optimisation of acoustic emission wavestreaming for structural health monitoring

2020 ◽  
Vol 19 (6) ◽  
pp. 2007-2022
Author(s):  
John P McCrory ◽  
Matthew R Pearson ◽  
Rhys Pullin ◽  
Karen M Holford
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Peak Frequency ◽  
Image Correlation ◽  
The Novel ◽  
Structural Health ◽  
Growth Activity ◽  
Materials Used ◽  
Novel Concept

Structural health monitoring has gained wide appeal for applications with high inspection costs, such as aircraft and wind turbines. As the structures and materials used in these industries evolve, so too must the technologies used to monitor them. Acoustic emission is a passive method of detecting damage which lends itself well to structural health monitoring. One form of acoustic emission monitoring, known as wavestreaming, involves intermittently recording data for set periods of time and using the sequential recordings to detect changes in the state of the structure. However, at present, there is no standard method for selecting appropriate wavestream recording parameters, such as their length or their interval of collection. This article investigates a method of optimising acoustic emission wavestreaming for structural health monitoring purposes by introducing the novel concept of adjoining consecutive discrete acoustic emission hit signals to create synthetic wavestreams. To this end, a pre-notched 492 mm × 67.5 mm × 20 mm, 300M grade steel cantilever specimen was subject to cyclic loading and both acoustic emission hit data and conventional wavestreams were collected as a crack grew in the notched region; crack growth activity was also monitored using digital image correlation for comparison. To demonstrate the proposed optimisation process, four sets of synthetic wavestreams were created from the hit data, 0.25, 0.5, 1.0 and 1.5 s in length, and compared with the 1.5-s-long conventional wavestreams. The activity of the peak frequency and frequency centroid bands of interest within the conventional and synthetic wavestreams were examined to determine whether or not cracking activity could be inferred through them. Across comparisons of all data, it was found that the 0.5-s-long synthetic wavestreams contained enough information to identify the same trends as the conventional wavestreams for this application; thus, the use of synthetic wavestreams as a tool for selecting an appropriate wavestream recording length was demonstrated.

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