• Title/Summary/Keyword: On-Line Monitoring

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In-Line Monitoring the Dispersion of Highly Energetic Material Simulant (고에너지 물질 시뮬란트의 분산도의 In-Line 모니터링)

  • Lee, Sangmook;Hong, In-Kwon;Ahn, Youngjoon;Lee, Jae Wook
    • Polymer(Korea)
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    • v.38 no.3
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    • pp.272-277
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    • 2014
  • We studied in-line monitoring the dispersion of highly energetic material simulant by a twin screw extruder having a high temperature ultrasonic system. The simulant suspension system consisted of ethylene vinyl acetate and Dechlorane plus 25 as binder and filler, respectively. With increasing filling fraction, the ultrasonic velocity was not changed but the attenuation linearly decreased. It was possible to estimate the solid fraction of well dispersed suspension system by measuring ultrasonic attenuation. The ultrasonic attenuation of samples filled over 60 v% approached straight line with increasing filling fraction when the samples was extruded repeatedly. It was due to the enhanced dispersion of solid particles in the suspension system. It was believed that the degree of dispersion and filling fraction could be obtained by combination of on-line measurement like ultrasonic attenuation and off-line analysis like TGA and SEM with image analyzer.

Strain monitoring of overhead contact line with FBG sensors (FBG 센서를 활용한 가공 전차선의 스트레인 모니터링)

  • Choi, Won-Seok;Ko, Ki-Han;Lee, Kyung-Bok;Park, Young;Cho, Yong-Hyeon
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.1227-1230
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    • 2008
  • This paper reports on measurement method for the fiber optic strain monitoring of overhead contact line systems of trains. We used fiber Bragg grating (FBG) sensors to measure the strain variation of overhead contact line. FBG sensors were attached on the contact line and connected to the monitering system with optical fibers. The monitering system with FBG sensors showed very good sensitivity to measuring strain variation and this system could be applied to the overhead contact line of KTX.

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Carbon fiber-based long-gauge sensors monitoring the flexural performance of FRP-reinforced concrete beams

  • Mohamed A. Saifeldeen;Nariman Fouad
    • Structural Monitoring and Maintenance
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    • v.10 no.4
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    • pp.299-314
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    • 2023
  • Long-gauge carbon fiber line (CFL) sensors have received considerable attention in the past decade. However, there is still a need for an in-depth investigation of their measuring accuracy. This study investigates the accuracy of carbon fiber line sensors to monitor and differentiate the flexural behavior of two beams, one reinforced with steel bars alone and the other reinforced with steel and basalt fiber-reinforced polymer bars. A distributed set of long-gauge carbon fiber line, Fiber Bragg Grating (FBG), and traditional strain gauge sensors was mounted on the tensile concrete surface of the studied beams to compare the results and assess the accuracies of the proposed sensors. The test beams were loaded monotonically under four-point bending loading until failure. Results indicated the importance of using long-gauge sensors in providing useful, accurate, and reliable information regarding global structural behavior, while point sensors are affected by local damage and strain concentrations. Furthermore, long-gauge carbon fiber line sensors demonstrated good agreement with the corresponding Fiber Bragg Grating sensors with acceptable accuracy, thereby exhibiting potential for application in monitoring the health of large-scale structures.

A study Improvement Direction for Arc Interruption Equipment and On-line Monitoring System of Consumer Low Voltage Facilities (수용가 저압 전기설비의 원격 감시시스템 및 아크차단 장치 활성화 방안에 관한 연구)

  • Kim, Gi-Hyun;Park, Chee-Hyun;Lim, Young-Bai;Choi, Myeong-Il;Bae, Suk-Myong
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.1
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    • pp.79-86
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    • 2008
  • Domestic and foreign follows the trend which is that safety checkup of electrical facilities is serviced by on-line system with joining information technology. This paper research improvement of what kind of system and law for market environment of electric power value added service. For improvement of market environment of electric power value added service, this paper researches improvement of on-line monitoring system and necessity of arc interruption and revision of arc related law.

Practical Applications of Multi-Agent Transformer Condition Monitoring (다수 변압기의 온라인 모니터링을 위한 실제 적용)

  • Yun, Ju-Ho;Choi, Yong-Sung;Hwang, Jong-Sun;Lee, Kyung-Sup
    • Proceedings of the KIEE Conference
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    • 2008.04b
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    • pp.96-99
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    • 2008
  • On-line condition monitoring is a useful tool for maintaining and extending the longevity of power transformers. An intelligent diagnostic system is desirable for operational safety and reliability. Bringing these concepts together results in a powerful support tool for engineers, reducing the volume of data to deal with, and making the data more meaningful. This paper describes how a multi-agent system for diagnosing the cause of transformer partial discharge activity was coupled with a method of UHF partial discharge monitoring, creating an on-line condition monitoring system. The challenges presented by the on-site environment are discussed, along with the implications for the complete system.

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Dielectric Cure Monitoring for Glass/Polyester Prepreg Composites (유리섬유/폴리에스터 복합재료를 위한 유전 경화 모니터링)

  • Kim, Hyoung-Geun;Kim, Jin-Kook;Lee, Dai-Gil
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.797-803
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    • 2001
  • The on-line cure monitoring of fiber reinforced thermosetting resin matrix composite material was performed for the better quality and productivity during manufacturing. Since the dissipation factor measured by dielectrometry method is dependent on the degree of cure and temperature of resin, in this study, a new method to obtain the degree of cure during on-line cure monitoring for glass/polyester composites was developed by employing a combination function of the temperature and the dissipation factor. Two sensor signals from a K-type thermocouple and an interdigitated dielectric sensor were processed during curing process under various cure cycles. The DSC (Differential Scanning Calorimetry) data was also used for the reference of degree of cure.

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On-Line Condition Monitoring for Rotating Machinery Using Multivariate Statistical Analysis (다변량 통계 분석 방법을 이용한 회전기계 이상 온라인 감시)

  • Kim, Heung-Mook;Lim, Eun-Seop
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.06a
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    • pp.1108-1113
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    • 2000
  • A condition monitoring methodology for rotating machinery is proposed based on multivariate statistical analysis. The CMS usually are using the vibration signal amplitude such as acceleration RMS, peak and velocity RMS to detect machine faults but the information is not so enough that CMS cannot perform reliable monitoring. So new parameters are added such as shape factor, crest factor, kurtosis and skewness as time domain parameters and spectrum amplitude of rotating frequency, $2^{nd}$ harmonics and gear mesh frequency etc. as frequency domain parameters. Many parameters are combined to represent the machine state using the Hotelling's $T^2$ statistics. The proposed methodology is tested in laboratory and the on-line experiment has shown that the proposed methodology offers a reliable monitoring for rotating machinery.

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A Scan-Based On-Line Aging Monitoring Scheme

  • Yi, Hyunbean;Yoneda, Tomokazu;Inoue, Michiko
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.14 no.1
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    • pp.124-130
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    • 2014
  • In highly reliable and durable systems, failures due to aging might result in catastrophes. Aging monitoring techniques to prevent catastrophes by predicting such a failure are required. This paper presents a scan-based on-line aging monitoring scheme which monitors aging during normal operation and gives an alarm if aging is detected so that the system users take action before a failure occurs. We illustrate our modified scan chain architecture and aging monitoring control method. Experimental results show our simulation results to verify the functions of the proposed scheme.

A study of system development for on-line monitoring and fault diagnosis of a concrete plant (콘크리트 플랜트의 온-라인 감시 및 고장진단을 위한 시스템 개발에 대한 연구)

  • 공영준;장태규;양원영
    • 제어로봇시스템학회:학술대회논문집
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    • 1993.10a
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    • pp.228-232
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    • 1993
  • This paper describes a on-line monitoring and fault diagnosis system designed for the automation of a medium-size concrete plant. The system is based on the structure of a hardware system of data acquisition and a personal computer. Simulation results are presented to illustrate the system operation. It applies the preconstructed rules to the plant data for the diagnosis of weighing processes.

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Studies on the Variation of the Ozone Precursors using On-Line Air Monitoring System (ON-line System을 이용한 오존 Precursor의 거동에 대한 연구)

  • 조석주;윤중섭;여인학;이민환;김민영;김신도
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2002.04a
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    • pp.251-252
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    • 2002
  • 최근 서울시보건환경연구원에서는 국내 최초로 미국의 PAMS(Photochemical Assessment Monitoring Systems) 측정망을 응용한 VOCs 측정망을 구축하여 대기 중 탄화수소를 포함하는 휘발성유기화합물를 측정 운영 중에 있다. VOCs는 그 종류와 발생원이 복잡 다양할 뿐만 아니라 시료의 채집과 분석방법에 여러 가지 기술적인 어려움이 내재한다. (중략)

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