• Title, Summary, Keyword: instrumentation

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Adaptive Fuzzy Controller Design Using Pole Assignment Compansator (극배치 보상기를 가진 적응 퍼지 제어기의 설계)

  • Choi, Chang-Ho;Hong, Dae-Seung;Ryu, Chang-Wan;Jeon, Sang-Yeong;Yim, Wha-Yeong
    • Proceedings of the KIEE Conference
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    • pp.862-864
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    • 1999
  • Adaptive Fuzzy control system is very powerful in nonlinear system, but That system require exactly membership function and parameter. If the membership function and parameter are not exact, the system will generate chattering. Using the Pole assignment compensator can remove the chattering and steepest descent method can reduce the convergence time. In this Paper, this algorithm applicate to the Inverted pendulum, so save proof of algorithm that is to be vigorous.

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Control of a Inverted Pendulum Using Fuzzy-PID Controller (퍼지 PID 제어기를 이용한 도립진자 제어)

  • Shin, Ja-Ho;Hong, Dae-Seung;Ryu, Chang-Wan;Ko, Jae-Ho;Yim, Wha-Yeong
    • Proceedings of the KIEE Conference
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    • pp.859-861
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    • 1999
  • This paper describes the development of a fuzzy gain scheduling scheme of PID controller for inverted pendulum system. Fuzzy rules and reasoning are utilized on-line to determine the controller parameters based on the error signal and its difference. Simulation results demonstrate that better control performance can be achieved in comparison with PID controller using pole placement to control of a Inverted pendulum.

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Characteristics of Ultrasonic Motor using Voltage Control and Phase Difference Control (초음파 모터의 전압 및 위상차 제어 특성)

  • Shin, Duk;Kim, Dong-Ok;Ko, Nak-Yong;Choi, Han-Soo;Kim, Young-Dong
    • Proceedings of the KIEE Conference
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    • pp.949-952
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    • 1996
  • The ultrasonic motor(USM) has good characteristics such as compact size, silent motion, low speed, high torque and high speed response. The USM is driven by 2-phase AC electricity. The control parameters of USM are voltage, phase difference, frequency of input power, etc. In this paper, we propose voltage difference control. And we designed USM controller to adjust voltage and phase using pLSI(programmable Large Scale Integration). Voltage difference control has many advantages that are lower current, lower power than phase difference control. Especially there is nearly zero ampere at the zero point of speed and torque. we can apply this voltage difference control to the compliance control of DD manipulator.

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Color volumetric 3D display system based on a rotating LED Screen

  • Haifeng, Li;Jiang, Wu;Xu, Liu;Caijie, Yan;Zhenrong, Zheng
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.510-512
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    • 2009
  • A volumetric 3D display system based on a rotating two dimensional color LED array is set up. It has a cylinder display space ${\Phi}800{\times}640mm3$ which is composed of 256 slices of pictures in one 3D image with each slice $320{\times}256$ LED pixels. The volumetric image has 4 gray scales and 64 colors. The main structure and working principle of the system is described in detail.

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Development of LVAD Control System using Micro Controller (마이크로 컨트롤러를 이용한 전기유압식 좌심실보조기 제어시스템의 개발)

  • Lee, S.W.;Chung, C.I.;Choi, J.W.;Kim, H.C.;Min, B.G.
    • Proceedings of the KOSOMBE Conference
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    • v.1992 no.11
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    • pp.127-129
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    • 1992
  • In this paper, we describe about control system for eletro-hydraulic LVAD(Left Ventricular Assist Device) and control algorithm for two operation mode. One is asynchronous operation mode and the other is synchronous operation mode synchronized with natural heart's R pulse. We also present implementation method of software PI algorithm for velocity control of motor used in LVAD system and its response.

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Speed and efficiency control of induction motors via asymptotic decoupling

  • Kim, Gyu-Sik;Ha, In-Joong;Ko, Myoung-Sam;Kim, Dong-Il;Kim, Jeom-Geun
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1041-1046
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    • 1989
  • In this paper, we attempt to control induction motors with high power efficiency as well as high dynamic performance by utilizing the recently developed theories: singular perturbation technique and noninteracting feedback control. Our controller does not need the transformation between a d-q synchronously rotating frame and a x-y stator-fixed frame. It is computationally quite simple. Furthermore, it does not depend on the rotor resistance. To illuminate the practical significance of our results, we present simulation and experimental results as well as mathematical performance analysis.

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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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Power supply development for marine environmental monitoring sensors using the IPMC (IPMC를 이용한 해양 환경 모니터링 센서용 전원 장치 개발)

  • Kang, Min-woo;Kim, Min;Choi, Myoung-hoon;Jung, Jae-hoon;Park, Won-hyun;Kim, Gwan-hyung;Byun, Ki-sik
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.136-137
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    • 2015
  • 이온성 고분자 금속 복합체(Ionic polymer metal composite, IPMC)는 전기 활성 고분자(Electro active polymer, EAP)중의 하나로 IPMC의 양 전극에 전기적인 자극을 가하면 굽힘 변형이 발생하고, 반대로 기계적인 자극이 주어지면 양 전극 사이에 전위차가 발생하여 전기를 얻을 수 있어 차세대 액추에이터와 센서로의 적용이 가능하다. 본 논문에서는 IPMC를 센서 소재로 사용하여 해양 환경 모니터링 센서에 전원을 공급하는 장치 개발을 설명하고자 한다.

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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.

THE EFFECT OF EARLY CORONAL FLARING ABOUT APICAL EXTRUSION OF DEBRIS (근관의 치경부 조기 확대가 치근단 잔사 정출에 미치는 효과)

  • Kim, Min-Kyung;Min, Jeong-Beom;Hwang, Ho-Keel
    • Restorative Dentistry and Endodontics
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    • v.29 no.2
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    • pp.147-152
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    • 2004
  • The purpose of this study was to investigate the quantity of debris which was extruded apically after canal instrumentation using different types of enlarging instrument in endodontic resin models. Five groups of 9 endodontic resin models were instrumented using each different technique : hand instrumentation without early coronal flaring. hand instrumentation after early coronal flaring. and three nickel-titanium engine-driven instrumentations (Hero 642, Protaper, $K^$). Debris extruded from apical foramen during instrumentation was collected on preweighed CBC bottle, desiccated and weighted using electronic balance. The results were analyzed using Kruskal-wallis test and Mann-Whitney U rank sum test at a significance level of 0.05. The results were as follows: 1. All of instrumentation techniques produced apically extruded debris. 2. Group without early coronal flaring extruded significant more debris than groups with early coronal flaring. 3. There was no significant difference among early coronal flaring groups. The early coronal flaring is very important to reduce the amount of debris extruded apically.