• Title, Summary, Keyword: instrumentation

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Design and simulation of resonance based DC current sensor

  • Santhosh Kumar, B.V.M.P.;Suresh, K.;Varun Kumar, U.;Uma, G.;Umapathy, M.
    • Interaction and multiscale mechanics
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    • v.3 no.3
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    • pp.257-266
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    • 2010
  • A novel resonance based proximity DC current sensor is proposed. The sensor consists of a piezo sensed and actuated cantilever beam with a permanent magnet mounted at its free end. When the sensor is placed in proximity to a wire carrying DC current, resonant frequency of the beam changes with change in current. This change in resonant frequency is used to determine the current through the wire. The structure is simulated in micro and meso scale using COMSOL Multi physics software and the sensor is found to be linear with good sensitivity.

Development of a Digital System for Protection and Control of a Substation Part 2 - Development of Fiber Optic Network (변전소의 보호.제어를 위한 디지탈 시스템 개발 PART 2 - 광 통신망 개발)

  • Kwon, W.H.;Park, S.H.;Kim, M.J.;Lee, Y.I.;Park, H.K.;Moon, Y.S.;Yoon, M.C.;Kim, I.D.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • pp.362-364
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    • 1992
  • In this paper, the development of a fiber optic network for an integrated digital protection relay system is described. The structure of the developed network is determined to loosen the optic requirements and to have good extensibility while providing sufficient functions for protection and control for substations. The network has a hierarchical structure with two levels. The upper level handles data for monitoring and control of the system with star topology. The lower level manages the real time data for bus protection with one-to-one connections. Communication flows of each level are described. The HDLC is employed as the network protocol.

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A Study of the real-time graphic deformation algorithm with virtual environment control (가상환경 제어에서 실시간 그래픽 변형에 관한 연구)

  • Kim, Young-Su;Bae, Chul;Kim, A-Hyun;Park, Kyung-Seok;Kang, Won-Chan;Kim, Young-Dong
    • Proceedings of the KIEE Conference
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    • pp.2265-2267
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    • 2003
  • In this paper, the virtual reality system is tried to developed, which controls not only the sense of sight and hearing but also the sense of touch, In order to develope the sense of touch in this study, the stable tactual transaction system, based on summing up the basic algorithm and theory is embodied. Especially, the graphic deformation algorithm is developed in realtime with using the deformed FEM. To apply the FEM, a deformed material model is produced and then the graphic deformation with this model is able to force. Finally, the graphic transaction algorithm is deduced by the realtime calculation and simplification because the purpose of this system is to transact in real time. The result of this study is that the proposed system is possible to deform the graphics and transact the haptic in real time in PC. The simulation program has been made to prove this result.

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Acoustic Metal Impact Signal Processing with Fuzzy Logic for the Monitoring of Loose Parts in Nuclear Power Plang

  • Oh, Yong-Gyun;Park, Su-Young;Rhee, Ill-Keun;Hong, Hyeong-Pyo;Han, Sang-Joon;Choi, Chan-Duk;Chun, Chong-Son
    • The Journal of the Acoustical Society of Korea
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    • v.15 no.1E
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    • pp.5-19
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    • 1996
  • This paper proposes a loose part monitoring system (LPMS) design with a signal processing method based on fuzzy logic. Considering fuzzy characteristics of metallic impact waveform due to not only interferences from various types of noises in an operating nuclear power plant but also complex wave propagation paths within a monitored mechanical structure, the proposed LPMS design incorporates the comprehensive relation among impact signal features in the fuzzy rule bases for the purposes of alarm discrimination and impact diagnosis improvement. The impact signal features for the fuzzy rule bases include the rising time, the falling time, and the peak voltage values of the impact signal envelopes. Fuzzy inference results based on the fuzzy membership values of these impact signal features determine the confidence level data for each signal feature. The total integrated confidence level data is used for alarm discrimination and impact diagnosis purposes. Through the perpormance test of the proposed LPMS with mock-up structures and instrumentation facility, test results show that the system is effective in diagnosis of the loose part impact event(i.e., the evaluation of possible impacted area and degree of impact magnitude) as well as in suppressing false alarm generation.

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Effects of TiN bufer on field emission properties of conical-type tungsten tips with carbon nanotubes coated (원뿔형 CNT-W 팁의 TiN 완충막 유무에 따른 전계방출 특성)

  • Kim, Young-Kwang;Yun, Sung-Jun;Kim, Won;Kim, Jong-Pil;Park, Chang-Kyun;Park, Jin-Seok
    • Proceedings of the KIEE Conference
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    • pp.1271-1272
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    • 2007
  • Experimental results regarding to the structural properties of carbon nanotubes (CNTs) and the field-emission characteristics of CNT-coated tungsten (W) tips are presented. CNTs are successfully grown on conical-type W-tips by inductively coupled plasma-chemical vapor deposition (ICP-CVD) with or without inserting a TiN-buffer layer prior to the formation of Ni catalysts. For all the CNTs grown, their nanostructures, morphologies, and crystalline structures are analyzed by FESEM, HRTEM, and Raman spectroscopy. Furthermore, the emission properties of CNT-based field-emitters are characterized to estimate the maximum current density and the threshold voltage. The results obtained in this study indicate that the emission current level of the CNT-emitter without using a TiN buffer is desirable for the application of micro-focused x-ray systems.

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Design and Fabrication of a PZT cantilever for low resonant frequency energy harvesting (낮은 공진 주파수를 갖는 PZT 외팔보 에너지 수확소자의 설계 및 제작)

  • Kim, Moon-Keun;Hwang, Beom-Seok;Seo, Won-Jin;Choi, Seung-Min;Jeong, Jae-Hwa;Kwon, Kwang-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.228-228
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    • 2010
  • 본 연구에서는 공진주파수 수식을 이용한 MATLAB과 Modal 해석법을 사용한 ANSYS로 공진주파수 특성을 시뮬레이션 하였다. 외팔보의 시뮬레이션 결과에서는 길이가 길어짐에 따라, 또는 proof mass의 크기가 커짐에따라 공진주파수 특성이 낮아지는 결과가 나타났다. 따라서 본 실험에서의 외팔보는 낮은 공진 주파수를 가지기 위해 Si proof mass를 사용하여 제작하였다. 외팔보 소자는 Silicon-on-insulator wafer를 사용하여 SiO2/Ti/Pt/PZT/Pt 박막을 증착하였고, 마스크를 사용한 식각 공정으로 제작하였다. 이때의 MATLAB, ANSYS 시뮬레이션 결과와 실험에서 제작된 소자는 유사한 공진주파수 특성을 나타내었다.

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Analog Front-End IC for Automotive Battery Sensor (차량 배터리 센서용 Analog Front-End IC 설계)

  • Yeo, Jae-Jin;Jeong, Bong-Yong;Roh, Jeong-Jin
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.10
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    • pp.6-14
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    • 2011
  • This paper presents the design of the battery sensor IC for instrumentation of current, voltage using delta-sigma ADC. The proposed circuit consists of programmable gain instrumentation amplifier (PGIA) and second-order discrete-time delta-sigma modulator with 1-bit quantization were fabricated by a 0.25 ${\mu}m$ CMOS technology. Design circuit show that the modulator achieves 82 dB signal-to-noise ratio (SNR) over a 2 kHz signal bandwidth with an oversampling ratio (OSR) of 256 and differential nonlinearity (DNL) of ${\pm}$ 0.3 LSB, integral nonlinearity (INL) of ${\pm}$ 0.5 LSB. Power consumption is 4.5 mW.

Stochastic System Reduction and Control via Component Cost Analysis (구성요소치 해석을 이용한 확률계의 축소와 제어)

  • Chae, Kyo-Soon;Lee, Dong-Hee;Park, Sung-Man;Yeo, Un-Kyung;Cho, Yun-Hyun;Heo, Hoon
    • Proceedings of the KSME Conference
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    • pp.921-926
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    • 2007
  • A dynamic system under random disturbance is considered in the study. In order to control the system efficiently, proper reduction of system dimension is indispensible in design stage. The reduction method using component cost analysis in conjunction with stochastic analysis is proposed for the control of a system. System response is obtained in terms of dynamic moment equation via Fokker-Plank-Kolmogorov(F-P-K) equation. The dynamic moment response of the system under random disturbance are reduced by using of deterministic version of component cost analysis. The reduced system via proposed "stochastic component cost analysis" is successfully implemented for dynamic response and shows remarkable control performance effectively utilizing "stochastic controller" in physical time domain.

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