Wireless enabled fatigue sensor for structural health monitoring

Özkul, Tarık
Kaplan, Halit
A fatigue sensor for monitoring the health state of structural members is disclosed. The sensor has multiple parallel beams, each sensitive to different levels of fatigue, that are designed to fail prematurely but progressively as the sensor goes through the same fatigue cycles as the structural member it is attached to. Whenever fatigue levels on a particular beam of the sensor exceed the engineered number of fatigue cycles, that particular beam fails and sensor electronics can detect that failure and transmit this information wirelessly when interrogated by an external interrogator. Having multiple beams that fail after different numbers of fatigue cycles enables the health state of the structural member to be monitored, in that unlike normal fracture sensor that sense failure of the structural members after the actual fracture event, the present invention is capable of sensing imminent failure of the structural member before the actual failure occurs.


Lung ultrasound and computed tomographic findings in pregnant woman with COVID-19
Kalafat, Erkan; Yaprak, E.; ÇINAR, GÜLE; VARLI, BULUT; Ozisik, S.; UZUN, ÇAĞLAR; AZAP, ALPAY; KOÇ, ASLI (2020-06-01)
Imaging modalities play a crucial role in the management of suspected COVID-19 patients. Before reverse transcription polymerase chain reaction (RT-PCR) test results are positive, 60-93% of patients have positive chest computed tomographic (CT) findings consistent with COVID-19. We report a case of positive lung ultrasound findings consistent with COVID-19 in a woman with an initially negative RT-PCR result. The lung ultrasound-imaging findings were present between the negative and subsequent positive RT-PC...
Design of a Novel THz Sensor for Structural Health Monitoring Applications
Pavia, J. P.; Ribeiro, M. A.; Sarikaya, C. K.; Akbar, D.; Altan, Hakan; Souto, N. (2019-01-01)
In this paper, we propose a study on the characterization, design and simulation of a THz sensor for applications in Structural Health Monitoring (SHM). The proposed sensor is assembled using two frequency selective surfaces (FSSs) based on metamaterial wire resonators. We present a theoretical model to describe its electromagnetics which is used not only to understand the physical principles underlying the functioning of the sensor but also to determine a set of optimized parameters for its operation in th...
Development and experimental verification of a structural health monitoring system for composite beams with embedded fibre bragg grating sensors
Değerliyurt, Boray; Şahin, Melin; Department of Aerospace Engineering (2017)
Structural Health Monitoring (SHM) is a discipline of development and application of monitoring and detecting adverse changes and damage in a structure in operation. This study explains development of a SHM system of composite beams with embedded Fibre Bragg Grating (FBG) sensors and its verification through experiments. There are considerations that require attention during manufacturing of composite specimens with embedded sensors. During manufacturing, protective teflon tubes are added to the ingress and...
Wireless Healthcare Monitoring with RFID-Enhanced Video Sensor Networks
Alemdar, Hande; Ersoy, Cem (SAGE Publications, 2010-01-01)
In pervasive healthcare systems, WSNs provide rich contextual information and alerting mechanisms against odd conditions with continuous monitoring. Furthermore, they minimize the need for caregivers and help the chronically ill and elderly to survive an independent life. In this paper, we propose an outdoor monitoring environment and evaluate the capabilities of video sensor networks for healthcare monitoring in an outdoor setting. The results exhibit that their capabilities are limited. For this reason, w...
Comparison of ML and MAP parameter estimation techniques for the solution of inverse electrocardiography problem
Erenler, Taha; Serinağaoğlu Doğrusöz, Yeşim; Department of Electrical and Electronics Engineering (2018)
This study aims to determine the cardiac electrical activity from body surface potential measurements. This problem is called the inverse problem of electrocardiography. Reconstruction of the cardiac electrical activity from the body surface potential measurements is not an easy task, since this problem has an ill-posed nature due to attenuation and spatial smoothing inside the medium between the source and the measurement sites, meaning that even small errors in the mathematical model or noise in the measu...
Citation Formats
T. Özkul and H. Kaplan, “Wireless enabled fatigue sensor for structural health monitoring,” 00, 2011.