Concrete structural health monitoring using piezoceramic-based wireless sensor networks

Peng Li,Haichang Gu,Gangbing Song,Rong Zheng,YL Mo 국제구조공학회 2010 Smart Structures and Systems, An International Jou Vol.6 No.6

Impact detection and health monitoring are very important tasks for civil infrastructures, such as bridges. Piezoceramic based transducers are widely researched for these tasks due to the piezoceramic material inherent advantages of dual sensing and actuation ability, which enables the active sensing method for structural health monitoring with a network of piezoceramic transducers. Wireless sensor networks, which are easy for deployment, have great potential in health monitoring systems for large civil infrastructures to identify early-age damages. However, most commercial wireless sensor networks are general purpose and may not be optimized for a network of piezoceramic based transducers. Wireless networks of piezoceramic transducers for active sensing have special requirements, such as relatively high sampling rate (at a few-thousand Hz), incorporation of an amplifier for the piezoceramic element for actuation, and low energy consumption for actuation. In this paper, a wireless network is specially designed for piezoceramic transducers to implement impact detection and active sensing for structural health monitoring. A power efficient embedded system is designed to form the wireless sensor network that is capable of high sampling rate. A 32 bit RISC wireless microcontroller is chosen as the main processor. Detailed design of the hardware system and software system of the wireless sensor network is presented in this paper. To verify the functionality of the wireless sensor network, it is deployed on a two-story concrete frame with embedded piezoceramic transducers, and the active sensing property of piezoceramic material is used to detect the damage in the structure. Experimental results show that the wireless sensor network can effectively implement active sensing and impact detection with high sampling rate while maintaining low power consumption by performing offline data processing and minimizing wireless communication.

Concrete structural health monitoring using piezoceramic-based wireless sensor networks

Li, Peng,Gu, Haichang,Song, Gangbing,Zheng, Rong,Mo, Y.L. Techno-Press 2010 Smart Structures and Systems, An International Jou Vol.6 No.5

Impact detection and health monitoring are very important tasks for civil infrastructures, such as bridges. Piezoceramic based transducers are widely researched for these tasks due to the piezoceramic material's inherent advantages of dual sensing and actuation ability, which enables the active sensing method for structural health monitoring with a network of piezoceramic transducers. Wireless sensor networks, which are easy for deployment, have great potential in health monitoring systems for large civil infrastructures to identify early-age damages. However, most commercial wireless sensor networks are general purpose and may not be optimized for a network of piezoceramic based transducers. Wireless networks of piezoceramic transducers for active sensing have special requirements, such as relatively high sampling rate (at a few-thousand Hz), incorporation of an amplifier for the piezoceramic element for actuation, and low energy consumption for actuation. In this paper, a wireless network is specially designed for piezoceramic transducers to implement impact detection and active sensing for structural health monitoring. A power efficient embedded system is designed to form the wireless sensor network that is capable of high sampling rate. A 32 bit RISC wireless microcontroller is chosen as the main processor. Detailed design of the hardware system and software system of the wireless sensor network is presented in this paper. To verify the functionality of the wireless sensor network, it is deployed on a two-story concrete frame with embedded piezoceramic transducers, and the active sensing property of piezoceramic material is used to detect the damage in the structure. Experimental results show that the wireless sensor network can effectively implement active sensing and impact detection with high sampling rate while maintaining low power consumption by performing offline data processing and minimizing wireless communication.

Wireless sensor networks for long-term structural health monitoring

Jonas Meyer,Reinhard Bischoff,Glauco Feltrin,Masoud Motavalli 국제구조공학회 2010 Smart Structures and Systems, An International Jou Vol.6 No.3

In the last decade, wireless sensor networks have emerged as a promising technology that could accelerate progress in the field of structural monitoring. The main advantages of wireless sensor networks compared to conventional monitoring technologies are fast deployment, small interference with the surroundings, self-organization, flexibility and scalability. These features could enable mass application of monitoring systems, even on smaller structures. However, since wireless sensor network nodes are battery powered and data communication is the most energy consuming task, transferring all the acquired raw data through the network would dramatically limit system lifetime. Hence, data reduction has to be achieved at the node level in order to meet the system lifetime requirements of real life applications. The objective of this paper is to discuss some general aspects of data processing and management in monitoring systems based on wireless sensor networks, to present a prototype monitoring system for civil engineering structures, and to illustrate long-term field test results.

Cross Layer 기반의 무선랜 채널 모니터링을 적용한 네트워크 적응형 HD 비디오 스트리밍

박상훈,윤하영,김종원,조창식,Park Sang-Hoon,Yoon Ha-Young,Kim Jong-Won,Cho Chang-Sik 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.4A

본 논문에서는 IEEE 802.11a 무선랜(WLAN) 환경에서 Cross Layer 기반의 채널 모니터링(Cross-Layered Monitoring: CLM)을 이용한 네트워크 적응형 고선명(high definition: HD) MPEG-2 TS 비디오 스트리밍 시스템을 제안한다. 무선 채널 모니터링을 위해 AE(access point)는 MAC(medium access control) 계층의 전송 상태를 주기적으로 측정하고 응용 계층의 스트리밍 서버로 전달한다. 이것은 비디오 스트리밍 응용 프로그램이 피드백 기반의 종단간 모니터링(End-to-End Monitoring: E2EM) 기법을 적용할 때보다 가변적인 무선 채널 상태에 좀 더 빠르고 효과적으로 적응할 수 있게 한다. 스트리밍 서버는 네트워크에 적응적인 전송을 위해 측정된 무선 채널 상태에 따라 우선순위 기반의 프레임 폐기(priority-based frame dropping)를 수행한다. 이를 위해 스트리밍 서버는 실시간 파싱(real-time parsing)과 프레임 기반의 패킷 우선순위화(frame-based prioritized packetization) 기능을 제공한다. 성능 평가를 위해 IEEE 802.11a 무선랜 환경에서의 다양한 스트리밍 실험을 수행한다. 실험 결과는 제안 시스템이 시간에 따라 가변하는 무선 채널 상태에서 기존 기법에 비해 종단간 비디오 스트리밍의 품질을 향상시킬 수 있음을 보여준다. In this paper, we propose a practical implementation of network-adaptive HD(high definition) MPEG-2 video streaming with a cross-layered channel monitoring(CLM) over the IEEE 802.11a WLAN(wireless local area network). For wireless channel monitoring, AP(access point) periodically measures the MAC(medium access control) layer transmission information and sends the monitoring information to a streaming server. This makes that the streaming server reacts more quickly as well as efficiently to the fluctuated wireless channel than that of the end-to-end monitoring(E2EM) scheme for the video adaptation. The streaming sewer dynamically performs the priority-based frame dropping to adjust the video sending rate according to the measured wireless channel condition. For this purpose, our streaming system nicely provides frame-based prioritized packetization by using a real-time stream parsing module. Various evaluation results over an IEEE 802.11a WLAM testbed are provided to verify the intended QoS adaptation capability The experimental results show that the proposed system can effectively mitigate the quality degradation of video streaming caused by the fluctuations of time-varying wireless channel condition.

Wireless sensor networks for long-term structural health monitoring

Meyer, Jonas,Bischoff, Reinhard,Feltrin, Glauco,Motavalli, Masoud Techno-Press 2010 Smart Structures and Systems, An International Jou Vol.6 No.3

In the last decade, wireless sensor networks have emerged as a promising technology that could accelerate progress in the field of structural monitoring. The main advantages of wireless sensor networks compared to conventional monitoring technologies are fast deployment, small interference with the surroundings, self-organization, flexibility and scalability. These features could enable mass application of monitoring systems, even on smaller structures. However, since wireless sensor network nodes are battery powered and data communication is the most energy consuming task, transferring all the acquired raw data through the network would dramatically limit system lifetime. Hence, data reduction has to be achieved at the node level in order to meet the system lifetime requirements of real life applications. The objective of this paper is to discuss some general aspects of data processing and management in monitoring systems based on wireless sensor networks, to present a prototype monitoring system for civil engineering structures, and to illustrate long-term field test results.

Wearable and Implantable Sensors for Cardiovascular Monitoring: A Review

Jazba Asad,Jawwad Ibrahim International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.7

The cardiovascular syndrome is the dominant reason for death and the number of deaths due to this syndrome has greatly increased recently. Regular cardiac monitoring is crucial in controlling heart parameters, particularly for initial examination and precautions. The quantity of cardiac patients is rising each day and it would increase the load of work for doctors/nurses in handling the patients' situation. Hence, it needed a solution that might benefit doctors/nurses in monitoring the improvement of the health condition of patients in real-time and likewise assure decreasing medical treatment expenses. Regular heart monitoring via wireless body area networks (WBANs) including implantable and wearable medical devices is contemplated as a life-changing technique for medical assistance. This article focuses on the latest development in wearable and implantable devices for cardiovascular monitoring. First, we go through the wearable devices for the electrocardiogram (ECG) monitoring. Then, we reviewed the implantable devices for Blood Pressure (BP) monitoring. Subsequently, the evaluation of leading wearable and implantable sensors for heart monitoring mentioned over the previous six years, the current article provides uncertain direction concerning the description of diagnostic effectiveness, thus intending on making discussion in the technical communal to permit aimed at the formation of well-designed techniques. The article is concluded by debating several technical issues in wearable and implantable technology and their possible potential solutions for conquering these challenges.

회전 기계 상태 감시용 무선 계측 시스템의 개발

심민찬(Min-Chan Shim),양보석(Bo-Suk Yang) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

This paper proposed an effective condition monitoring system based on wireless measurement technique. The application of wireless technique makes real-time and continuous monitoring are available. The development of wireless condition monitoring system can improve the performance that removed a current wired sensor and cable and reduce overall cost of condition monitoring. This system mainly consists of two parts: Transmitter(TM) and Base Station (BS). TM acquires dynamic signals from objective machine by integrated electronic piezo-electric (ICP) type accelerometer sensors. The acquired Direct Current (DC) signals are processed by analogue filters, and then converted to digital signal. Terminal board (programmed microprocessor) is inserted in the TM that transferred converted signal to BS through the WLAN protocol. BS composed of signal processing and monitoring part. The LabVIEW Library and visual C++.NET are utilize in this monitoring system Using this application; the wireless technique is employed to develop more stable and adequate condition monitoring system for high speed rotating machine..

Wireless pressure sensor integrated with a 3D printed polymer stent for smart health monitoring

Park, Jongsung,Kim, Ji-Kwan,Kim, Dong-Su,Shanmugasundaram, Arunkumar,Park, Su A,Kang, Sohi,Kim, Sung-Ho,Jeong, Myung Ho,Lee, Dong-Weon Elsevier 2019 Sensors and actuators. B Chemical Vol.280 No.-

<P><B>Abstract</B></P> <P>The primary objective of this study was to deploy a promising wireless pressure sensor system capable of monitoring real-time biological signals in an experimental object. MEMS-based micromachining technology was used to fabricate the proposed SU-8 wireless pressure sensor. The sensor utilizes a capacitor-inductor resonant circuit that can operate the sensor without any external power supply. The variable capacitor in the pressure sensor is designed to change the resonance frequency (130, 183 MHz) in response to applied pressure. The fabricated wireless pressure sensor was integrated into a polymer-based smart stent to minimize the discomfort of medication administration and hospital visits. A 3D bio-printing-based manufacturing technique was employed for the production of a smart polymer stent with complicated shapes. The proposed method is considerably more comfortable than the conventional metal stents fabrication process. The polymer smart stent made of the biocompatible polycaprolactone (PCL) material which can be fully absorbed by the body after a medication period. After integrating the fabricated wireless pressure sensor with the polymer smart stent, various basic experiments such as the working distance of the sensor were performed using a simple experimental setup. The biocompatibility of the proposed polymer stent and the wireless pressure sensor was also successfully confirmed using an experimental animal. The preliminary investigation results indicate that the proposed wireless sensor can be used to obtain necessary information in various parts of the human body as well as the stent.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fabrication of SU-8 based wireless pressure sensor for battery-less operation. </LI> <LI> Manufacturing of biodegradable polymer stent using 3D printing technique. </LI> <LI> Integration of wireless pressure sensor into polymer stent for real-time blood pressure monitoring. </LI> <LI> Verification of the biocompatibility of smart stent and its operation with experimental animals. </LI> <LI> Continuous measurement of blood pressure change in animals for more than 3 months. </LI> </UL> </P>

지그비 메쉬 네트워크를 이용한 대형건물의 실시간 실내 환경 모니터링

임병찬(Pyeongchan Ihm),조성우(Sung Woo Cho) 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.9

사물인터넷 기술의 발전과 함께 블루투스(Bluetooth), 와이파이(WiFi), 지그비(ZigBee) 등 다양한 무선 통신기술들이 개발되어 현장에서 무선 통신모듈과 센서를 결합한 실시간 환경모니터링 방안이 측정에 활용하고 있다. 무선통신 범위도 비교적 넓고 데이터 전송속도도 빠른 와이파이는 실시간 모니터링에 적합하지만 통신모듈의 전력소비량이 상대적으로 크며 무선 통신 네트워크를 구축하는데 필요한 무선 공유기 설치에 따른 어려움이 있다. 본 연구는 대형건물에서 건물 전체를 대상으로 실시간 건물 실내 환경 모니터링이 가능한 무선 통신 센서 네트워크의 성능평가와 효과적인 네트워크 구축방안에 관하여 연구를 하였다. 또한 저전력 지그비 통신모듈과 저가의 아두이노를 활용하여 사물인터넷 시제품을 개발하였다. 이 장치들로 구성된 무선 통신 네트워크를 건물 전체를 대상으로 구축하여 네트워크의 무선 통신성능과 실시간 건물 실내 환경 모니터링의 가능성을 제시하였다. 단일 연결(one-hop)과 다중 연결(multi-hop)에 대한 지그비 통신모듈의 성능을 분석하였으며 다중 연결 상태에서 건물 전체에 대한 지그비 통신의 수신율은 양호한 것으로 나타났다. 대형건물에서 건물 전체를 대상으로 지그비 메쉬 네트워크를 사용한 무선 센서 네트워크를 구축할 수 있을 것으로 사료된다. With the development of Internet of Things (IOT) techniques, several wireless communication technologies such as Bluetooth, WiFi, and ZigBee are being developed and currently applied to a real-time environment monitoring system combined with sensors. A WiFi communication network with broad wireless range and fast baud rate of data transfer rate is suitable for real-time monitoring. However it consumes more power for the communication module and has a difficulty in the installation of a an access point. This study evaluated the performance and the effective layout of a wireless sensor communication network for real-time monitoring of an indoor environment of a whole large-scale building. In addition, an IOT product was developed with a ZigBee module with low power consumption and low-cost Arduino module. The product was utilized to construct a ZigBee-based wireless communication network and used to evaluate the performance of a wireless communication network. One-hop and multi-hop connections of ZigBee communication were analyzed with the variation of horizontal and vertical distance within a whole building. The performance of a multi-hop connection for ZigBee communication was better than one-hop communication regarding on the received signal strength indicator and packet delivery ratio. The suggested ZigBee-based wireless mesh communication network system was applied to a whole large-scale building and is a very effective way to construct a real-time wireless sensor network for monitoring indoor environment conditions.

Rapid full-scale expansion joint monitoring using wireless hybrid sensor

장신애,Sushil Dahal,Jingcheng Li 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.12 No.4

Condition assessment and monitoring of bridges is critical for safe passenger travel, public transportation, and efficient freight. In monitoring, displacement measurement capability is important to keep track of performance of bridge, in part or as whole. One of the most important parts of a bridge is the expansion joint, which accommodates continuous cyclic thermal expansion of the whole bridge. Though expansion joint is critical for bridge performance, its inspection and monitoring has not been considered significantly because the monitoring requires long-term data using cost intensive equipment. Recently, a wireless smart sensor network (WSSN) has drawn significant attention for transportation infrastructure monitoring because of its merits in low cost, easy installation, and versatile on-board computation capability. In this paper, a rapid wireless displacement monitoring system, wireless hybrid sensor (WHS), has been developed to monitor displacement of expansion joints of bridges. The WHS has been calibrated for both static and dynamic displacement measurement in laboratory environment, and deployed on an in-service highway bridge to demonstrate rapid expansion joint monitoring. The test-bed is a continuous steel girder bridge, the Founders Bridge, in East Hartford, Connecticut. Using the WHS system, the static and dynamic displacement of the expansion joint has been measured. The short-term displacement trend in terms of temperature is calculated. With the WHS system, approximately 6% of the time has been spent for installation, and 94% of time for the measurement showing strong potential of the developed system for rapid displacement monitoring.