scholarly journals Online Bridge Crack Monitoring with Smart Film

2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Benniu Zhang ◽  
Shuliang Wang ◽  
Xingxing Li ◽  
Zhixiang Zhou ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Monitoring System ◽  
Remote Monitoring ◽  
Communication Protocol ◽  
Low Frequency ◽  
Normal Strain ◽  
Monitoring Method ◽  
Crack Monitoring ◽  
Length Width ◽  
Mechanical Sensing

Smart film crack monitoring method, which can be used for detecting initiation, length, width, shape, location, and propagation of cracks on real bridges, is proposed. Firstly, the fabrication of the smart film is developed. Then the feasibility of the method is analyzed and verified by the mechanical sensing character of the smart film under the two conditions of normal strain and crack initiation. Meanwhile, the coupling interference between parallel enameled wires of the smart film is discussed, and then low-frequency detecting signal and the custom communication protocol are used to decrease interference. On this basis, crack monitoring system with smart film is designed, where the collected crack data is sent to the remote monitoring center and the cracks are simulated and recurred. Finally, the monitoring system is applied to six bridges, and the effects are discussed.

A Novel Fatigue Crack Monitoring Method Based on Nonlinear Dynamic Characteristics of Strain

2019 ◽  
Vol 20 (01) ◽  
pp. 2050016
Author(s):  
Dong Yang ◽  
Dan Li ◽  
K. S. C. Kuang
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Real Time ◽  
Nonlinear Dynamic ◽  
Crack Opening ◽  
Steel Structures ◽  
Monitoring Method ◽  
Strain Measurements ◽  
Crack Monitoring

This paper presents a novel fatigue crack monitoring method for steel specimens based on the smoothness priors method (SPM) and Tsallis entropy (TE) of strain measurements. The aim of the study is to detect initiation of a crack in steel specimens and subsequently to monitor its propagation under the fatigue load, based on real-time strain measurements. The nonlinear dynamic response of the structure was exploited since it degrades due to the initiation and subsequent propagation of the crack under the external dynamic excitation. The proposed method was experimentally validated. Here, the SPM is applied to decomposing the structural strain response into a nearly-stationary (NS) component and a low frequency aperiodic trend (LFAT) component. Features associated with crack initiation can be extracted from the NS component. The LFAT component, on the other hand, can be used to identify crack propagation. To tackle the singularity of the structural responses associated with a crack, the TE of the NS component was used in detection and monitoring of the crack in the steel specimen. Two other techniques, namely, acoustic emission (AE) sensor and crack opening displacement (COD) gauge were used for the purpose of calibration and comparison. The results show remarkable resemblance in terms of crack initiation and propagation identification exhibited by all three types of sensors, highlighting the potential of the proposed method for real-time detection and subsequent monitoring of crack propagation in steel structures.

A Novel Design for Crack Width Monitoring of Concrete Structures

2011 ◽  
Vol 80-81 ◽  
pp. 571-574
Author(s):  
Ben Niu Zhang ◽  
Xing Xing Li ◽  
Zhi Xiang Zhou
Keyword(s):  
Crack Initiation ◽  
Health Monitoring ◽  
Crack Width ◽  
Concrete Structures ◽  
Challenging Problem ◽  
Crack Initiation And Propagation ◽  
Monitoring Method ◽  
Initiation And Propagation ◽  
Crack Monitoring ◽  
Novel Design

Crack monitoring is thought to be a challenging problem for structural health monitoring. In previous study, a bionic crack monitoring method is proposed to monitor the crack initiation and propagation in a structure, and smart film is designed and fabricated. A novel design, based on smart film for monitoring crack width of concrete structures, is proposed in this paper. Experiment verifies the effectiveness of this design, and proves it is a good way for crack width monitoring of concrete structures.

Wireless Concrete Construction Monitoring System Based on Mobile-Agent and GPRS

2014 ◽  
Vol 602-605 ◽  
pp. 1675-1679
Author(s):  
A Long Yu ◽  
Peng Ji
Keyword(s):  
Monitoring System ◽  
Mobile Agent ◽  
Remote Monitoring ◽  
Mass Concrete ◽  
Monitoring Method ◽  
Construction Monitoring ◽  
Data Packets ◽  
Strain Monitoring ◽  
Display Function ◽  
Concrete Casting

By monitoring and controlling the temperature and stress of concrete in the process of mass concrete casting, the temperature stress can be reduced effectively. In response to problems of traditional temperature and strain monitoring method, a new kind of distributed temperature and strain monitoring system based on mobile-agent and GPRS had been proposed. And also this system design a data integration middleware based on mobile-agent which verify the validity of the middleware through the experiment on Genomote nodes of network. Through GPRS network, remote data monitoring center receives data packets of temperature and strain of the concrete. The real-time display function of temperature and strain parameters was achieved by PC software programmed by Labview. The experiment show that the temperature acquisition value and the standard temperature error is within the scope of the permit (<1°C) and the system is stable, reliable for the needs of the remote monitoring.

scholarly journals A Remote Monitoring System of Logistics Carrier Based on Wireless Sensor Network

2018 ◽  
Vol 14 (01) ◽  
pp. 4
Author(s):  
Wang Weidong
Keyword(s):  
Wireless Sensor Network ◽  
Real Time ◽  
Sensor Network ◽  
Monitoring System ◽  
Remote Monitoring ◽  
Monitoring Network ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Remote Monitoring System ◽  
Monitoring Center

To improve the efficiency of the remote monitoring system for logistics transportation, we proposed a remote monitoring system based on wireless sensor network and GPRS communication. The system can collect information from the wireless sensor network and transmit the information to the ZigBee interpreter. The monitoring system mainly includes the following parts: Car terminal, GPRS transmission network and monitoring center. Car terminal mainly consists by the Zigbee microcontroller and peripherals, wireless sensor nodes, RFID reader, GPRS wireless communication module composed of a micro-wireless monitoring network. The information collected by the sensor communicates through the GPRS and the monitoring center on the network coordinator, sends the collected information to the monitoring center, and the monitoring center realizes the information of the logistics vehicle in real time. The system has high applicability, meets the design requirements in the real-time acquisition and information transmission of the information of the logistics transport vehicles and goods, and realizes the function of remote monitoring.

A 4-tiers architecture for mobile WBAN based health remote monitoring system

2017 ◽  
Vol 24 (6) ◽  
pp. 2179-2190 ◽  
Author(s):  
Audace Manirabona ◽  
Lamia Chaari Fourati
Keyword(s):  
Monitoring System ◽  
Remote Monitoring ◽  
Remote Monitoring System
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