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A Study on Measurement of ESDD and Contamination Performance of Polymeric Outdoor Insulators (옥외용 절연체 표면에서의 ESDD 측정과 내오손특성에 관한 연구)

  • 연복희;유형철;이현진;송정용;이태호;허창수
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.427-430
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    • 2002
  • This paper presents on contamination performance of polymeric outdoor insulator with different contaminant accumulation. The ESDD (equivalent salt deposit density), tracking resistance and clean-fog test were performed to investigate the characteristics of contamination performance on polymeric outdoor insulator. Furthermore, we evaluated together with the porcelain samples for its comparison. It is found that ESDD of polymeric and porcelain insulator depends on the installation position. This surface accumulation of contaminant lead to the loss of surface hydrophobicity, expecially upper shed part of polymeric insulator. In addition, the effect of an artificial contaminant on the tracking resistance by inclined-plane method and leakage suppression ability under clean fog was surveyed. The time of tracking failure did not appear to change significantly with a much contaminant accumulation, while leakage current under clean-fog increased.

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CURRENT STATUS OF THERMAL/HYDRAULIC FEASIBILITY PROJECT FOR REDUCED- MODERATION WATER REACTOR (2) - DEVELOPMENT OF TWO-PHASE FLOW SIMULATION CODE WITH ADVANCED INTERFACE TRACKING METHOD

  • Yoshida, Hiroyuki;Tamai, Hidesada;Ohnuki, Akira;Takase, Kazuyuki;Akimoto, Hajime
    • Nuclear Engineering and Technology
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    • v.38 no.2
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    • pp.119-128
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    • 2006
  • We start to develop a predictable technology for thermal-hydraulic performance of the RMWR core using an advanced numerical simulation technology. As a part of this technology development, we are developing the advanced interface tracking method to improve the conservation of volume of fluid. The present paper describes a part of the development of the twophase flow simulation code TPFIT with the advanced interface tracking method. The numerical results applied to large-scale water-vapor two-phase flow in tight lattice rod bundles are shown and compared with experimental results. In the results of numerical simulation, a tendency of the predicted void fraction distribution in horizontal plane agreed with the measured values obtained by the advanced neutron radiography technique including the bridge formation of the liquid at the position of adjacent fuel rods where an interval is the narrowest.

The Evaluation of Tracking and Erosion Resistance of Silicone Rubber for Outdoor Use by the Inclined-Plane Method (경사평면법에 의한 옥외용 실리콘고우의 내트래킹성 및 내침식성 평가)

  • Kim, J.H.;Song, W.C.;Park, Y.G.;Kim, H.G.;Kim, I.S.;Han, S.W.;Cho, H.G.
    • Proceedings of the KIEE Conference
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    • 1997.07d
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    • pp.1500-1502
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    • 1997
  • We investigated the tracking and erosion resistance of the silicone rubber by Inclined-Plane Method. And, with the variation of the accelerated conditions such as the applied voltage and composition of contaminant, the change of the tracking characteristics according to such conditions was evaluated. The leakage current significantly increases with the increasing voltage, but the weight loss remains almost the same. The voltage above 5.0 kV isn't recommended because tracking breakdown occurs as fast as it does without erosion, and the typical discharge waveform was the form of rectifying wave.

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Location and Direction Tracking of Small UAVs on Occlusion Area in Moving Surveillance System (이동보안시스템에서 폐색영역에서의 소형무인비행체 위치 및 방향 추적)

  • Moon, Yong-Ho;Cheon, Seung-Hyeon;Ha, Seok-Wun
    • IEMEK Journal of Embedded Systems and Applications
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    • v.10 no.5
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    • pp.317-324
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    • 2015
  • In his paper, we propose the graphic-based direction tracking system that be able to detect the current location and direction of the flight object and virtually run the pointing to the flight direction when a small UAV is located in the occlusion area behind buildings or obstacles in the moving surveillance systems. Based on the experimental results about the simulation flight path extracted from the Mission Planner we found the proposed system operates the desired flight mission effectively in tracking.

Path Tracking Control for Mobile Robot Considering Its Dynamics (동특성을 고려한 이동로봇의 궤적제어)

  • Ko, Kyung-Suk;Lee, Min-Jung;Choi, Young-Kiu
    • Proceedings of the KIEE Conference
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    • 2001.07d
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    • pp.2473-2475
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    • 2001
  • In trajectory tracking methods, the error values of current position and velocity are compensated to follow the given reference path and velocity. The path tracking for a wheeled mobile robot is treated in this paper. It is very difficult to implement stable trajectory tracking algorithms because mobile robots have kinematically non-holonomic constraints. For solving this problem, a velocity controller is presented in this paper. This velocity controller is designed by a PID controller which could be easily employed. In this case, velocity errors caused by system uncertainties or internal and external disturbances could exist. A neural network is used for compensating the velocity errors. Input variables of this neural network compensator are defined by differences between the velocities of the posture controller and the real velocities of the mobile robot. Simulation results show the effectiveness of the proposed controller.

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The Design and Fabrication of an Active DR-Based RF Module for Location Tracking (능동형 DR 기반의 위치 추적용 RF 모듈의 설계 및 제작)

  • Kim, Dong-Ok
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.9 no.2
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    • pp.48-55
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    • 2010
  • This paper proposes a realtime tracking algorithm of mobile object in indoor or outdoor environment. For this purpose the proposed system selects location data closer to mobile objects in real time using Triangulation method and DCM (Database Correlation Method). Also, this system utilizes the adjusted location data selected by using Kalman filter to improve the location accuracy of transfer object. Be studied in existing the Kalman filter have unstable location data until its settlement because of it extracts current values by using the past the information. However, proposed location tracking system don't apply existent Kalman filter to this system and it permits precisional tracking location by using more effective methods.

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A Study on the Weavingless Arc Sensor System in GMA Welding (I) -Implementation of Weld Seam Tracking Algrithm- (GMA 용접에서 강제적인 위빙이 없는 아크센서 시스템에 관한 연구 (I) -용접선 추적 알고리즘의 구현-)

  • 안재현;김재웅
    • Journal of Welding and Joining
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    • v.16 no.3
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    • pp.44-54
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    • 1998
  • In this study a new arc sensor algorithm for automatic weld seam tracking was proposed, which uses the relative welding current variation according to the tip-to-workpiece distance in GMA welding. Since the new developed arc sensor algorithm is not sensitive to unstable factors of arc signal, the system is expected to get rid of the problems of already existing arc sensor system which include the difficulty of modeling the process for various welding conditions and limitation of application to thick plate welding. Thus the system is applicable not only to thick plate welding but also to thin plate welding. To implement the new arc sensor algorithm the system parameters which include sampling time, averaging range, weighting factor of moving averaging, basic compensation time, and basic compensation distance were determined by experimental analysis. Consequently this system has shown the successful tracking capability for the various welding conditions.

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The Pivotless Tracking Type Floating Photovoltaic System and the Collected Data Analysis (무회전축 회전식 수상태양광 시스템 및 실증 데이터 분석)

  • Jee, Hongsub;Kim, Minwoo;Bae, Jaesung;Jeong, Jeongho;Lee, Jaehyeong
    • Current Photovoltaic Research
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    • v.9 no.4
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    • pp.133-136
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    • 2021
  • In this study, the pivotless tracking type floating photovoltaic system was demonstrated successfully. The photovoltaic modules were installed on buoyant objects and the dynamic stability reinforcement mooring gear, tension control equipment and buoyant stabilizer were used to provide enough buoyance and stability and response to the external environment. After installation of the pivotless tracking type floating photovoltaic system, generated solar energy was collected and analyzed.

Object tracking algorithm through RGB-D sensor in indoor environment (실내 환경에서 RGB-D 센서를 통한 객체 추적 알고리즘 제안)

  • Park, Jung-Tak;Lee, Sol;Park, Byung-Seo;Seo, Young-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2022.10a
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    • pp.248-249
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    • 2022
  • In this paper, we propose a method for classifying and tracking objects based on information of multiple users obtained using RGB-D cameras. The 3D information and color information acquired through the RGB-D camera are acquired and information about each user is stored. We propose a user classification and location tracking algorithm in the entire image by calculating the similarity between users in the current frame and the previous frame through the information on the location and appearance of each user obtained from the entire image.

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A Fast Motion Detection and Tracking Algorithm for Automatic Control of an Object Tracking Camera (객체 추적 카메라 제어를 위한 고속의 움직임 검출 및 추적 알고리즘)

  • 강동구;나종범
    • Journal of Broadcast Engineering
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    • v.7 no.2
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    • pp.181-191
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    • 2002
  • Video based surveillance systems based on an active camera require a fast algorithm for real time detection and tracking of local motion in the presence of global motion. This paper presents a new fast and efficient motion detection and tracking algorithm using the displaced frame difference (DFD). In the Proposed algorithm, first, a Previous frame is adaptively selected according to the magnitude of object motion, and the global motion is estimated by using only a few confident matching blocks for a fast and accurate result. Then, a DFD is obtained between the current frame and the selected previous frame displaced by the global motion. Finally, a moving object is extracted from the noisy DFD by utilizing the correlation between the DFD and current frame. We implement this algorithm into an active camera system including a pan-tilt unit and a standard PC equipped with an AMD 800MHz processor. The system can perform the exhaustive search for a search range of 120, and achieve the processing speed of about 50 frames/sec for video sequences of 320×240. Thereby, it provides satisfactory tracking results.