• 제목/요약/키워드: electrode distance

검색결과 410건 처리시간 0.028초

형조 방전가공에서 극간 전압과 가공 안정성에 관한 연구 (A Study on the Gap Voltage and Machining Stability in Diesinking Electrical Discharge Machining)

  • 김광열;이상민;이건기
    • Journal of Advanced Marine Engineering and Technology
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    • 제27권3호
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    • pp.429-436
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    • 2003
  • The electrical discharge machining(EDM) with Si electrode instead of Gr or Cu electrode. made enormous effects on the surface. machining time, anti-caustic workpiece surface and so on In this paper. we experimented on the inter-role distance during discharge the electrical phenomenon of inter-pole, the distribution of discharge point. the distribution of off load time. etc., using Si electrode Cu electrode and Gr electrode under the same machining condition. As a result of a large quantity generated exclusive powders. the performance of the EDM using Si electrode. compared with EDM using others. is improved. We show that the quantities of those make far pole-gap discharge and discharge scatter under stable machining status possible.

Tandem 용접을 이용한 풍력타워 원주용접부 잔류응력 특성에 관한 연구 (A Study on Characteristic of Residual Stresses in a wind Tower Using the Tandem Circumferential Welding Process)

  • 김지선;김인주
    • 한국생산제조학회지
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    • 제21권6호
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    • pp.938-945
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    • 2012
  • This research proposes FEM analysis for Tandem welding process used in wind tower and predicts optimal welding process to improve the stability of welded structures. Three dimensional elasto-plastic analyses are employed to evaluate thermo-mechanical behavior of residual stress and deformation during Tandem welding for different distance between two touches. To confirm the thermal distribution, Goldak's ellipse heat source model and the real size wind tower pipe model are utilized. Four different analyses are being performed, where in each case the distance between two electrode torches is being changed and residual stress and welding deformation are predicted. Depending on base material state, each case is divided into: Liquid (100mm), Austenite+Liquid (200mm), Austenite+Cementite (400mm), Pearlite+Cementite (800mm).

Research on Assessment of Potential Interference between Individual Grounding Electrodes Using an Electrolytic Tank Modeling Method

  • Gil, Hyoung-Jun;Kim, Dong-Ook;Choi, Chung-Seog
    • 조명전기설비학회논문지
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    • 제22권3호
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    • pp.27-33
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    • 2008
  • This paper deals with the assessment of potential interference between individual grounding electrodes using an Electrolytic Tank Modeling method. When a test current was passed through a grounding electrode, potential rise was measured and analyzed using an electrolytic tank in real time. In order to analyze the potential interference between grounding electrodes, a reduced scale modeling method was studied. Potential interference between isolated grounding electrodes was evaluated as a function of the separation distance between grounding electrodes and the configuration of grounding electrode to be induced. It was found that the separation distance between grounding electrodes was a major factor in reducing the potential interference.

Development of Surface Myoelectric Sensor for Myoelectric Hand Prosthesis

  • Choi, Gi-Won;Moon, In-Hyuk;Sung, So-Young;Lee, Mynug-Joon;Chu, Jun-Uk;Mun, Mu-Seong
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2005년도 ICCAS
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    • pp.1268-1271
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    • 2005
  • This paper proposes a compact-sized surface myoelectric sensor for myoelectric hand prosthesis. To fit the surface myoelectric sensor in the socket of the myoelectric hand prosthesis, the sensor should be a compact size. The surface myoelectric sensor is composed of a skin interface and a single processing circuit that are mounted on a single package. Since the skin interface has one reference and two input electrodes, and the reference electrode is located in middle of two input electrodes, we propose two types of sensors with the circle- and bar-shaped reference electrode, but all input electrodes are the bar-shaped. The metal material used for the electrodes is the stainless steel (SUS440) that endures sweat and wet conditions. Considering conduction velocity and median frequency of the myoelectric signal, we select the inter-electrode distance (IED) between two input electrodes as 18mm, 20mm, and 22 mm. The signal processing circuit consists of a differential amplifier with band pass filter, a band rejection filter for rejecting 60Hz power-line noise, amplifiers, and a mean absolute value circuit. We evaluate the proposed sensor from the output characteristics according to the IED and the shape of the reference electrode. From the experimental results we show the surface myoelectric sensor with the 18mm IED and the bar-shaped reference electrode is suitable for the myoelectric hand prosthesis.

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불용성 전극을 이용한 Rhodamine B의 전기화학적 탈색 (Electrochemical Decolorization of a Rhodamine B using Dimensionally Stable Anode)

  • 김동석;박영식
    • 한국물환경학회지
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    • 제23권3호
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    • pp.377-384
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    • 2007
  • This study has carried out a performance of dimensionally stable anode for the purpose of decolorization of Rhodamine B (RhB) in water. Seven kinds of 1, 2 and 3 component electrodes were prepared by plating and thermal deposition, which were coated by the oxides of Pt, Ru, Ir, Sn-Sb, Ir-Sn-Sb, Ru-Sn-Sb and Ru-Sn-Ti on Ti metal surface, respectively. Performance for RhB decolorization of the seven electrodes lay in: Ru-Sn-Ti/Ti ${\fallingdotseq}$ Ru-Sn-Sb/Ti > Ir-Sn-Sb/Ti > Sn-Sb/Ti > Ru/Ti > Ir/Ti > Pt/Ti. The effects of electrode area and distance, electrolyte type and concentration, current density and pH were investigated on the decolorization of RhB using Ru-Sn-Ti/Ti electrode. Decolorization of RhB was not influenced by electrode area and distance largely, however wattage was influenced by them. NaCl was superior to the decolorization of RhB than $Na_2SO_4$. Optimum NaCl dosage and current density were 0.5 g/L and $0.183A/cm^2$, respectively. The pH effect of decolorization of RhB was not significant within the range of 3-7.

TLM pattern을 사용한 Cr/Ag 및 Ni 전극에 따른 접합 저항 연구 (Study of contact resistance using the transmission line method (TLM) pattern for metal of electrode (Cr/Ag & Ni))

  • 황민영;구기모;구선우;오규진;구상모
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 하계학술대회 논문집
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    • pp.349-349
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    • 2010
  • Great performance of many semiconductor devices requirs the use of low-resistance ohmic contact. Typically, transmission line method (TLM) patterns are used to measure the specific contact resistance between silicon and metal. In this works, we investigate contact resistance for metal dependent (Cr/Ag, Ni) using TLM pattern based on silicon-on-insulator (SOI) wafer. The electrode with Ni linearly increases contact resistance as the pattern distance increase from $15{\mu}m$ to $75{\mu}m$ in accumulation part, but non-linearly increase in inversion part. In additional, the electrode with Cr/Ag linearly increases contact resistance as the pattern distance increase from $15{\mu}m$ to $75{\mu}m$ in inversion part, but non-linearly increase in accumulation part.

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Double Pancake Coil형 고온초전도 변압기의 전기적 절연 특성 (Dielectric Insulation Properties of Double Pancake Coil Type HTS Transformer)

  • 백승명;정종만;이현수;한철수;김상현
    • 한국전기전자재료학회논문지
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    • 제16권2호
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    • pp.151-156
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    • 2003
  • High temperature superconductor can only be applied against an engineering specofication that has to be determined for each particular application form the design requirements for economic viability and for operation margins in service. However, in order to realize the HTS transformer, it is necessary to establish the high voltage insulation technique in cryogenic temperature. Therefore, the composite insulation of double pancake coil type transformer are described and AC breakdown voltage characteristics of liquid nitrogen(LN$_2$) under HTS pancake coil electrode made by Bi-2223/Ag are studied. The Breakdown of LN$_2$ is dominated electrode shape and distance. The influence of pressure on breakdown voltage is discussed with th different electrode. For the electrical insulation design of turn-to-turn insulation for the HTS transformer, we tested breakdown strength of insulation sheet under varying pressure. And we investigated surface flashover properties of LN$_2$ and complex conition of cryogenic gaseous nitrogen(CGN$_2$) obove a LN$_2$ surface. The surface voltage of GFRP was measured as a function of thickness and electrode distance in LN$_2$ and complex condition of CGN$_2$ above a LN$_2$ surface. this research presented information of electrical insulation design for double pancake coil(DPC) type HTS transformer.

수직 접지전극의 접지임피던스 측정에서 도전유도에 의한 오차 평가 (Evaluation of Errors Due to Earth Mutual Resistance in Measuring Ground Impedance of Vertically-driven Ground Electrode)

  • 최종혁;최영철;이복희
    • 전기학회논문지
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    • 제58권9호
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    • pp.1778-1783
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    • 2009
  • Ground impedance for the large grounding system is measured according to the IEEE Standard 81.2 which is based on the revised fall-of-potential method of installing auxiliary electrode at a right angle. When the auxiliary electrodes are located at an angle of $90^{\circ}$, the ground impedance inevitably includes the error due to earth mutual resistance. In this paper, in order to accurately measure the ground impedance of vertically-driven ground electrodes, error rates due to earth mutual resistance are evaluated by ground resistance and ground impedance measuring devices and compared with calculated values. As a result, the measured results are in good agreement with the computed results considering soil layer with different resistivity. The error rates due to earth mutual resistance decrease with increasing the length of ground electrode in the case that the ratio of the distance between the ground rod to be measured and the auxiliary electrodes to the length of ground electrode(D/L) is same. The ground impedance should be measured at the minimum distance between the auxiliary electrodes that will have an estimated measurement accuracy due to earth mutual resistance.

구현방식이 용이한 텍스타일 터치센서 개발 및 구조적 설계 (Development and Structural Design of Textile Touch Sensor Easily Implemented)

  • 김지선;박진희;김주용
    • 한국의류학회지
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    • 제45권1호
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    • pp.168-179
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    • 2021
  • This study presents and develops a textile type touch sensor structural design that is easy to implement. First, the design of the touch sensor circuit finds the size of the switch with the easiest finger contact and selects a structure with a long circuit with the lowest resistance value. An experiment is performed on a change in an electrostatic capacitance value that accompanies the distance on the electrode and the magnitude of the electrode area of the structure; however, the structure having the distance on the electrode and the large electrode area shows the best resistance change. The laundry assessment was conducted three times at a time and ten times at a time with an average standard deviation less than one ohm, with little change in resistance. Consequently, there were no problems with durability and performance for laundry. Finally, in the bending evaluation, the difference in resistance can be seen between 1-2 ohms and was developed as a smart wearable in the future; in addition, there was no problem as a difference in resistance can be seen between 1 and 2 ohms.

Fence 전극을 가진 ac PDP의 방전전압특성에 미치는 돌기 전극의 영향 (Effect of Hump Electrode on the Discharge Voltage of ac PDP with Fence Electrode)

  • 동은주;옥정우;윤초롬;이해준;이호준;박정후
    • 전기학회논문지
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    • 제57권2호
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    • pp.261-267
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    • 2008
  • One of the most important issues in fence-type PDP is low luminance and luminous efficiency. To improve luminance and luminous efficiency, new sustain electrode structure which contains long discharge gap is necessary. However, it causes rise of firing voltage. In this paper, a new fence electrode structure is proposed in order to solve these problems. To drop the firing voltage, tow hump shaped electrodes is added on the main discharge electrode, and distance between two humps is controlled. The experimental results show that the test panel with the narrow horizontal gap(40um) between two humps shows low firing voltage by 17V compared with 80um gap in spit of similar luminance and luminous efficiency.