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 MWCNT–Epoxy Nanocomposite Sensors for Structural Health Monitoring

Electronics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 143 ◽  
Author(s):  
Omid Sam-Daliri ◽  
Lisa-Marie Faller ◽  
Mohammadreza Farahani ◽  
Ali Roshanghias ◽  
Hannes Oberlercher ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Impedance Measurement ◽  
Building Structures ◽  
Adhesive Bonds ◽  
Structural Health ◽  
Multi Walled Carbon Nanotubes ◽  
Nanocomposite Sensors ◽  
Walled Carbon Nanotubes ◽  
Alternating Voltage

We address multi-walled carbon nanotubes (MWCNTs) for structural health monitoring in adhesive bonds, such as in building structures. MWCNT-loaded composites are employed to sense strain changes under tension load using an AC impedance measurement setup. Different weight percentages of 1, 1.5, 2 and 3 wt % MWCNTs are added to the base epoxy resin using different dispersion times, i.e., 5, 10, and 15 min. The equivalent parallel resistance of the specimens is first measured by applying an alternating voltage at different frequencies. To determine the mechanical as well as sensory properties, the specimens are then subjected to a tensile test with concurrent impedance measurement at a fixed pre-chosen frequency. Using alternating voltage, a higher sensitivity of the impedance reading can be achieved. Employing these sensors in buildings and combining the readings of a network of such devices can significantly improve the buildings’ safety. Additionally, networks of such sensors can be used to identify necessary maintenance actions and locations.

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)

Fatigue in aerostructures—where structural health monitoring can contribute to a complex subject

2006 ◽  
Vol 365 (1851) ◽  
pp. 561-587 ◽  
Author(s):  
Christian Boller ◽  
Matthias Buderath
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Aircraft Design ◽  
Jet Engines ◽  
Structural Health ◽  
Fatigue Design ◽  
The Impact ◽  
Maintenance Process ◽  
Complex Subject

An overview of the aircraft design and maintenance process is given with specific emphasis on the fatigue design as well as the phenomenon of the ageing aircraft observed over the life cycle. The different measures taken to guarantee structural integrity along the maintenance process are addressed. The impact of structural health monitoring as a means of possibly revolutionizing the current aircraft structural monitoring and design process is emphasized and comparison is made to jet engines and helicopters, where health monitoring has already found the respective breakthrough.

Composite High-Rise Structures: Structural Health Monitoring (SHM) and Case Studies

2018 ◽  
Vol 940 ◽  
pp. 146-152
Author(s):  
Koorosh Gharehbaghi ◽  
Maged Georgy ◽  
Farshid Rahmani
Keyword(s):  
Composite Materials ◽  
Structural Health Monitoring ◽  
Case Studies ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Focal Point ◽  
Fiber Reinforced Concrete ◽  
Chemical Compositions ◽  
Structural Health ◽  
High Rise

High-rise construction typically implies a multi-storey structure approximately between forty to hundred and twenty meters tall (approximately twelve to forty storeys). On the other hand, composite materials are those made from two or more constituents generally with considerably dissimilar physical or chemical compositions. The focal point in this paper is in-particular on high-rise construction and whether or not composite materials’ structural integrity, and long-term sustainability, is comparable to that of a traditional building. To assess the composite materials’ structural integrity, Structural Health Monitoring (SHM) will also be utilised. While, composites possess different characteristics from those common to traditional materials; the universal purpose of producing such materials is to produce matters, which are stronger, lighter, and commonly less expensive. Generally, in construction, the composite materials typically include geo-polymers, fiber-reinforced concrete and others. For high-rise construction, these composite materials require to bear a variety of demanding conditions, including high winds and seismic conditions, which are important design factors for such structures. Nevertheless, a particular benefit of composite materials for high rise construction is their overall ability to maintain structural integrity despite their lack of conventional composition. The composite materials are traditionally utilised for high-rise buildings in order to reinforce the overall structural integrity. Accordingly, this paper will also include a number of case studies to support the ever-increasing utilization of composite materials for high-rise construction.

Automation Using Matrix Switch for Piezoelectric Actuator/Sensor Based Structural Health Monitoring

2014 ◽  
Vol 627 ◽  
pp. 213-216 ◽  
Author(s):  
Shi Yang Meng ◽  
M.H. Aliabadi
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Current System ◽  
Testing Time ◽  
Programming Technique ◽  
Structural Health ◽  
Switch Operation ◽  
The Matrix ◽  
Minimum Number ◽  
Interrogation Area

The implementation of the switch is the stepstone of a fully automated structural health monitoring (SHM) System. This paper attempted to tackle the hardware connectivity issues when dense transducer arrays present in the system with the switch that features the matrix topology. The program that controls the instruments and automates the data acquisition for SHM system was developed in LabVIEW, in which a scanning approach that sensorises the interrogation area and a hybrid programming technique are employed. Through interfacing with a top-level GUI of the program, it is easy to be controlled and employed. The solution showed a significant reduction in testing time comparing that with manual switch operation and a weight-saving solution as a minimum number of shielded cable needed. In addition, because only one channel each from the signal generator and digitiser is required, it is less demanding on the specification of the instruments. The prototype of the current system can be scaled up for testing on a larger structure due to its modular nature in both PXI express system and software design.

scholarly journals Inventory and monitoring of historical cultural heritage buildings on a territorial scale: a preliminary study of structural health monitoring based on the CARTIS approach

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 57
Author(s):  
Renato S. Olivito ◽  
Saverio Porzio ◽  
Carmelo Scuro ◽  
Domenico Luca Carnì ◽  
Francesco Lamonaca
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Building Inventory ◽  
Structural Health ◽  
Existing Structures ◽  
Seismic Engineering ◽  
Heritage Buildings ◽  
Materials Used ◽  
The Town

Earthquakes induce dynamic stresses in structures, and past seismic events have demonstrated that existing heritage buildings are highly vulnerable. This vulnerability applies to both reinforced-concrete and masonry buildings, which are concentrated in historic centres throughout Italy. Significant variations in construction account for the inadequacy of existing structures to withstand seismic actions, such as the materials used and the construction details, which can be neglected in building practices. This work focuses on the analysis of heritage buildings through an inventory using the <em>Caratterizzazione TIpologica Strutturale</em> (CARTIS) form developed by the Seismic Engineering University Laboratories Network in conjunction with the Civil Protection Department. On knowing a building framework, structural health monitoring (SHM) systems can be applied on the town compartments (TCs) that are prone to the highest vulnerabilities. A priority criticalities scale can be devised starting from the building inventory by identifying the TCs through the CARTIS-based data. This approach can be used to determine a safety threshold obtained via structural parametrical analysis using commercial software (VEMnl) with different building typologies. The next stage consists of the implementation of appropriate SHM to provide important information regarding the structural integrity of the buildings. The proposed methodology is outlined in this paper with reference to the suggested SHM system<span lang="EN-US">.</span>

On-Line NDE and Structural Health Monitoring for Advanced Reactors

2006 ◽  
Vol 321-323 ◽  
pp. 234-239 ◽  
Author(s):  
N. Nakagawa ◽  
F. Inanc ◽  
A. Frishman ◽  
R. Bruce Thompson ◽  
W.R. Junker ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Power Systems ◽  
Health Monitoring ◽  
Nuclear Power ◽  
Structural Integrity ◽  
Continuous Reactor ◽  
Structural Health ◽  
Sensor Performance ◽  
On Line

This paper considers the use of on-line structural health monitoring in advanced nuclear power systems such as IRIS. The motivation for the on-line health monitoring is to prevent routine maintenance from interrupting long-term continuous reactor operation. However, the outcome of the on-line monitoring implementation has a broader impact, and amounts to a paradigm shift in maintenance strategy from outage-based maintenance to continuous real-time monitoring of operational and structural integrity. Indeed, on-line health monitoring data will provide a foundation for diagnostics and prognostics (i.e., predictive) capabilities that will detect component degradation prior to failure, thus allowing for proactive rather than reactive maintenance strategies. Specifically, this paper briefly reports on our studies on (1) on-line monitoring strategy and its benefits, (2) candidate reactor components where on-line monitoring provides maximum benefits, (3) applicable on-line NDE sensor methodologies and conceptual sensor designs, and (4) model-based sensor performance estimations.

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 [...]

scholarly journals Recent Advancements in AI-Enabled Smart Electronics Packaging for Structural Health Monitoring

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1537
Author(s):  
Vinamra Bhushan Sharma ◽  
Saurabh Tewari ◽  
Susham Biswas ◽  
Bharat Lohani ◽  
Umakant Dhar Dwivedi ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Smart Cities ◽  
Structural Health ◽  
Civil Infrastructures ◽  
Data Capturing ◽  
Smart Data ◽  
Complex Monitoring ◽  
Smart Electronics

Real-time health monitoring of civil infrastructures is performed to maintain their structural integrity, sustainability, and serviceability for a longer time. With smart electronics and packaging technology, large amounts of complex monitoring data are generated, requiring sophisticated artificial intelligence (AI) techniques for their processing. With the advancement of technology, more complex AI models have been applied, from simple models to sophisticated deep learning (DL) models, for structural health monitoring (SHM). In this article, a comprehensive review is performed, primarily on the applications of AI models for SHM to maintain the sustainability of diverse civil infrastructures. Three smart data capturing methods of SHM, namely, camera-based, smartphone-based, and unmanned aerial vehicle (UAV)-based methods, are also discussed, having made the utilization of intelligent paradigms easier. UAV is found to be the most promising smart data acquisition technology, whereas convolution neural networks are the most impressive DL model reported for SHM. Furthermore, current challenges and future perspectives of AI-based SHM systems are also described separately. Moreover, the Internet of Things (IoT) and smart city concepts are explained to elaborate on the contributions of intelligent SHM systems. The integration of SHM with IoT and cloud-based computing is leading us towards the evolution of future smart cities.

Structural Health Monitoring of Pipelines for Environment Pollution Mitigation

2015 ◽  
Author(s):  
Ferdinando Felli ◽  
Antonio Paolozzi ◽  
Cristian Vendittozzi ◽  
Claudio Paris ◽  
Hiroshi Asanuma ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Real Time ◽  
Fiber Optics ◽  
Health Monitoring ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Great Accuracy ◽  
Fuel Oil ◽  
Structural Health ◽  
Oil And Natural Gas

Oil and gas infrastructures may be exposed to landslides, earthquakes, corrosion and fatigue, and to damage from thefts or vandalism, leading to leakage and failure with serious economic and ecologic consequences. For this reason, an increasing interest in applied research on monitoring and protecting pipelines (for fuel, oil and natural gas transportation) arises. Aimed at the mitigation of catastrophic effects of human and natural damage, the present paper proposes a smart real-time Structural Health Monitoring (SHM) system capable to control structural integrity continuously, focusing on the issue of spillage for thefts of fuels which are not detectable, in real-time, by the existing monitoring systems. The system consists of a smart-pipeline containing a health monitoring integrated measurement chain, i.e. an enhanced Fiber Bragg Gratings-based fiber optics neural network on the pipes, for displacement and acceleration monitoring (gathering many other different measurements such as: ground motion, permanent ground displacement, pipeline temperature, pipeline deformation, leakage, etc.). Specifically, the ability to measure these characteristics at hundreds of points along a single fiber and the great accuracy of each point of measure, are particularly interesting for the monitoring of structures such as pipelines in order to detect hazardous and unauthorized intrusion and damage.

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