• Title/Summary/Keyword: Pole

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The Comparison and Analysis about Earth Resistance for Measuring of Earth Resistance by Measurement Positions of Auxiliary Poles (접지저항 측정을 위한 보조전극 위치에 따른 접지저항 비교 분석)

  • Han, Woon-Ki;Jung, Jin-Soo;Kim, Jae-Chul
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.10
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    • pp.128-133
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    • 2009
  • This paper describes the comparison and analysis about measurement method of earthing resistance by positions of potential pole and current pole. In KOREA, a diagonal by 6.5 times of earthing electrode for measurement of earthing resistances but this method was almost impossible in the downtown area. For solving this problem, in this paper measuring of earthing resistance changing parameters. The parameter was a distances of earthing electrode, potential pole & current pole and the another parameter was an angles of potential pole & current pole. Analysis result, earthing resistance stability that conditions. Fist, distance from earthing electrode to current pole was over 50[m] and distance from earthing electrode to potential pole was over 30[m]. Second, angles of potential pole & current pole was over $45[^{\circ}]$.

FRONTAL IMPACT FINITE ELEMENT MODELING TO DEVELOP FRP ENERGY ABSORBING POLE STRUCTURE

  • Elmarakbi, A.M.;Sennah, K.M.
    • International Journal of Automotive Technology
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    • v.7 no.5
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    • pp.555-564
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    • 2006
  • The aim of this paper is to contribute to the efficient design of traffic light poles involved in vehicle frontal collisions by developing a computer-based, finite-element model capable of capturing the impact characteristics. This is achieved by using the available non-linear dynamic analysis software "LS-DYNA3D", which can accurately predict the dynamic response of both the vehicle and the traffic light pole. The fiber reinforced polymer(FRP) as a new pole's material is proposed in this paper to increase energy absorption capabilities in the case of a traffic pole involved in a vehicle head-on collision. Numerical analyses are conducted to evaluate the effects of key parameters on the response of the pole embedded in soil when impacted by vehicles, including: soil type(clay and sand) and pole material type(FRP and steel). It is demonstrated from the numerical analysis that the FRP pole-soil system has favorable advantages over steel poles, where the FRP pole absorbed vehicle impact energy in a smoother behavior, which leads to smoother acceleration pulse and less deformation of the vehicle than those encountered with steel poles. Also, it was observed that clayey soil brings a slightly more resistance than sandy soil which helps reducing pole movement at ground level. Finally, FRP pole system provides more energy absorbing leading to protection during minor impacts and under service loading, and remain flexible enough to avoid influencing vehicle occupants, thus reducing fatalities and injuries resulting from the crash.

Application of SP and Pole-pole Array Electrical Resistivity Surveys to the Seawater Leakage Problem of the Embankment (방조제 누수지점 탐지를 위한 SP및 단극배열 전기비저항탐사의 적용)

  • 송성호;이규상;김진호;권병두
    • Economic and Environmental Geology
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    • v.33 no.5
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    • pp.417-424
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    • 2000
  • We applied SP monitoring and resistivity surveys using the pole-pole electrode array to seawater leakage problems in the Youngsan estuary dam and the Eoeun embankment to estimate and detect the zone of seawater leakage. The embankment is generally affected by tidal variation and has low resistivity characteristics due to the high saturation of seawater. For this reason, SP monitoring and the pole-pole array resistivity surveys, which are relatively more effective to the conductive media, were carried out to delineate the leakage zones of sea water through the embankment. We checked out electrical conductivity (EC) and temperature variations along the inner part of Youngsan estuary dam to detect the zone of seawater leakage and found that the measured EC value agreed to that of seawater in the leakage zone and the temperature was lower than that of the vicinity of leakage zone. SP monitoring results were coincided with tidal variations at each embankment. At the leakage zones in the Youngsan estuary dam and the Eoeun embankment, SP anomalies are in the range of -60~-85 mV and -20~-50 mV, respectively, and true resistivity values obtained by 2-D inversion are 3~15 ohm-m and below 0.3 ohm-m, respectively. Both SP monitoring and the pole-pole array resistivity method are found to be quite effective for investigation of seawater leakage zones in the embankment.

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A Study on the Pultrusion of Hybrid Composite Tube (하이브리드 복합재료 튜브의 Pultrusion 성형공정연구)

  • 성대영;김태욱;이광주
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.180-183
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    • 2001
  • Glass fiber reinforced plastic(CFHP) tent pole fabricated by the pultrusion process with unidirectional glass fiber is two times as heavy as aluminum tent pole owing to the low specific modulus The first objective of this research is the design the high strength and light weight tent pole compete with. the second is the develope glass fiber carbon fiber hybrid tent pole pultrusion process. the third is the evaluate the mechanical properties of the hybrid tent pole compare to these of the duralumin tent pole.

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Robust control of nonlinear system by using pole sensitivity (극점감도를 고려한 비선형 시스팀의 강인한 제어)

  • 서병설;강진식;임동균
    • 제어로봇시스템학회:학술대회논문집
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    • 1991.10a
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    • pp.185-190
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    • 1991
  • In this paper, we present a method of analising a system with nonlinear parameter by pole sensitivity defined by the rate of pole movement with respect of non-linear parameter variation. Pole sensitivity give us not only the rate of pole movement but also the directional information. We present a method of design of a state feedback for a system with nonlinear system parameter by considering the pole sensitivity and show that the suggested method guarantee the stability robustness for a system with nonlinear parameter, parameter perturbation and urimodelled dynamics.

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On-line Reinforcement Learning for Cart-pole Balancing Problem (카트-폴 균형 문제를 위한 실시간 강화 학습)

  • Kim, Byung-Chun;Lee, Chang-Hoon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.4
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    • pp.157-162
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    • 2010
  • The cart-pole balancing problem is a pseudo-standard benchmark problem from the field of control methods including genetic algorithms, artificial neural networks, and reinforcement learning. In this paper, we propose a novel approach by using online reinforcement learning(OREL) to solve this cart-pole balancing problem. The objective is to analyze the learning method of the OREL learning system in the cart-pole balancing problem. Through experiment, we can see that approximate faster the optimal value-function than Q-learning.

Sensitivity Analysis of Geometrical Parameters of a Switched Reluctance Motor with Modified Pole Shapes

  • Balaji, M.;Ramkumar, S.;Kamaraj, V.
    • Journal of Electrical Engineering and Technology
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    • v.9 no.1
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    • pp.136-142
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    • 2014
  • A major problem in Switched Reluctance Motor (SRM) is torque ripple, which causes undesirable acoustic noise and vibration. This work focuses on reducing the undesirable torque ripple in SRM by modifying stator and rotor geometry. This paper presents a comparative study on torque ripple minimization in SRM with modified pole shapes such as stator pole taper, stator pole face with non-uniform air gap and pole shoe attached to rotor pole. Further this paper presents a detailed sensitivity analysis of the effect of different geometrical parameters that alter the pole face shapes on the performance of SRM. The analysis is performed using finite-element method considering average torque and torque ripple as performance parameters. Based on the analysis, a design combining stator pole taper with non-uniform air gap is proposed to improve the torque characteristics of SRM. The dynamic characteristics of the proposed design are simulated and the results show satisfactory reduction in torque ripple.

Development of The H Type Steel Pole for 154kV Transmission Lines (154kV 송전선로용 H형 Steel Pole 개발)

  • Byun, Gang;Min, Byeong-Wook;Shin, Tai-Woo;Choi, Jin-Sung;Jiang, Moon-Myong;Song, Teak-Sang
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.433-435
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    • 2003
  • As the nation's standard of living rises lately, the common interest in the environmental issue is raised and the environmental design of a transmission line is needed. When the environmental design is needed, KEPCO used a steel pole instead of a rectangular tower. A steel pole has many advantages such as simplification of a tower and less damage to the forest according to less demand of site. But the weak withstand weight of a mono type steel pole is a problem. This paper introduces an H type steel pole which improves its withstand weight, reduces a diameter of a pole from 2.6m to 1.3m and decreases joining points according to the increase of unit length of a pole from 6m to 9m.

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Research of stresses distribution and loading weight on concrete electric pole (배전전주의 응력분포 및 하중에 관한 연구)

  • Kim, Dong-Myung;Kwon, Tae-Ho;Song, Il-Kweon;Lee, Byeong-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.249-251
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    • 2005
  • A method of double-pole construction is developing to strengthen the mechanical intensity of the electric poles. Therefore the mechanical properties of the double-pole were researched in this paper. First, considering field special quality electric poles were established. In the next tensile force was applied and stress distribution and fatigue load were examined. When a base of the pole is concrete, mechanical intensity of the double-pole increased about 1.7 times compared a single pole.

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