• Title, Summary, Keyword: Dropper

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Technique of Maximum Span Length Calculation for 350km/h High Speed Catenary System (최고운행속도 350km/h급 전차선로 최대경간길이 계산 기법)

  • Chang, Sang-Hoon;Lee, Ki-Won;Ryoo, Hyang-Bok
    • Proceedings of the KSR Conference
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    • pp.924-931
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    • 2011
  • This paper deal with maximum span calculation technique for 350km/h high speed catenary system. Considers a geometric interaction, possible maximum span length is between two pole. Wind condition and the train current collector is moving even to being pantograph does not escape while operating. Uses like this justice and possible maximum span length is follow next condition. (i) Operating range of pantograph fan head, (ii) The wind velocity which assumes from system, (iii) Width in pantograph from operation height moving, (iv) Type of processing Catenary system, specially tensile strength of overhead contact wire and messenger wire etc. When accurately calculates the maximum permission span, the dropper between of overhead contact wire and messenger wire and must consider the correlation.

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A Study on the Overhead Contact Lines Optimization According to the Increased Train Speed (전기철도 속도향상에 따른 전차선로 가선 시스템 최적화에 관한 연구)

  • Jung, In-Chul;Jeong, Rag-Gyo;Choi, Kyu-Hyoung
    • Proceedings of the KSR Conference
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    • pp.3037-3045
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    • 2011
  • The optimization of the overhead contact lines according to the increased train speed is to design the low-sag-wire so that the pantograph can follow the vertical fluctuation of the catenary. Main factors for the overhead contact lines design include the span, dropper interval, movable bracket, vertical fluctuation of the catenary, tension, and wave propagation speed. In this paper, a model is proposed to improve the electric railway speed, and the speed improvement analysis technology is examined to ensure the stable and reliable electric railway. In addition, the effect between pantograph and catenary according to the speed improvement is quantitatively analyzed by using simulation.

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Estimation of CIR based on FM Controller for Reinforcement QoS In Differentiated Services (차등화 서비스의 QoS 향상을 위한 FM 제어기에 기반한 CIR 추정)

  • Ko, Jin-Hyeok;Park, Ki-Kwang;Hwang, Young-Ho;Yang, Hai-Won
    • Proceedings of the KIEE Conference
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    • pp.249-250
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    • 2007
  • This paper presents design of meter for estimation Committed Information Rate(CIR) in Differentiated Services(DiffServ) networks. The DiffServ is a target model rather than a specification that contains detailed information about the required implementation. DiffServ provides a moderate level of quality differentiation without strict guarantees[1]. A DiffServ router consists of different components including classifier, meter, marker, dropper, shaper and scheduler. In this paper, we use the benefits of the fuzzy logic controller to design a fuzzy based traffic conditioner for DiffServ[2]. Simulations show that the approach is efficient and promising.

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Dynamic Simulation for High-speed Pantograph and Overhead-line using a Vibration Mode Superposition Method (모드중첩법을 이용한 고속용 팬터그래프와 전차선의 동적 상호작용 시뮬레이션)

  • Cho, Yong-Hyeon;Lee, Ki-Won;Park, Hyun-Jun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.494-497
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    • 2004
  • A dynamic simulation for a high-speed pantograph-overheadline has been performed using mode superposition method to predict contact forces between pantograph and overheadline. We can deal with non-linear dampers of the pantograph and pre-sag of overhead-line for the simulation. But, we can not consider slackness of dropper in the overhead-line. According to the simulation results, the contact forces and displacements are reasonably predicted, compared with other foreign simulation results.

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A Need of Buffering Function for Full-Off Fitting on Movable Bracket using Conventional Line (기존선 가동브래킷 곡선 당김 금구의 완충기능 필요성)

  • Ahn, Young-Hoon;Kim, Chul-Su;Lee, Seung-Il
    • Proceedings of the KSR Conference
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    • pp.219-222
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    • 2007
  • The Full-Off Fitting of Movable Bracket using conventional line have received a dynamic contact impact between contact wire and pantograph of electric rolling stock, so this impact cause a rapid vibration of foreword and back near the supporting point of movable bracket. The Full-Off Fitting on Movable Bracket in conventional line differs from that in high speed line. Now conventional line have required a speed up for new electric locomotive and electric car. In speed-up track and big impact place, the Full-Off Fitting and the dropper often get demage. We have done a study of buffering function to solve that problem in conventional line. We have find a need adopting buffer fitting. It is decrease a dynamic impact between contact wire and pantograph of electric rolling stock.

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Fundamental Study on the Fracture Cause of Dropper Wire in Catenary System (고속철도 전차선로 드롭퍼 와이어 파단원인 기초연구)

  • Lee, Tae-Hoon;Park, Gi-Bum;Jeon, Yong-Joo;Ryu, Yong-Tae
    • Proceedings of the KIEE Conference
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    • pp.1071-1072
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    • 2008
  • 본 논문에서는 고속철도 전차선로 드롭퍼 와이어의 파단현상에 대해 분석을 통하여 철도운행의 안정성 향상을 위한 기초연구를 수행하였다. 300km/h로 주행하는 KTX의 판토그래프와 전차선이 직접 접촉하면서 발생되는 기계적 피로도의 누적으로 인한 증가로 경부고속선 전차선로 시스템의 장애사고 예방을 목적으로 하고 있다. 추후, 고속철도 전차선로 드롭퍼 수명한계 측정으로 유지보수관리 체계 효율화와 분석된 파단원인을 바탕으로 드롭퍼 구조개선 방안을 마련하여 합리적 개량방안 수립을 하고자 한다.

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Aging Analysis of Catenary Wires in Accordance with Temperature Changes for a Long Period of Time (장기간 온도변화에 따른 전차선로 전선류의 노후도 분석)

  • Cho, Nam-Hee;Oh, Wan-Shik;Kim, Jae-moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.9
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    • pp.1590-1596
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    • 2016
  • In this paper, catenary wires were analyzed aging through the experiment about a new product and a test sample in accordance with temperature changes from long-term use. In case of the contact wire, the maximum load was reduced within 7% and the tensile strength showed a reduced within 6.7% compared with a new reference standard $110mm^2$. 19 Strands of messenger wire have a little more than a standard value, but result data on tensile test were less than the reference value about stranded wire. Also parts among 49 strands of dropper was found to be smaller than the reference value and it appeared greatly increasing intensity as toward the center of the strand.

A study on the small melon-shaped celadon ewer found in the Sinan shipwreck (신안선 출수 청자과형소주자(靑磁瓜形小注子)의 용도에 관한 시론)

  • Lee, Myoungok
    • MUNHWAJAE Korean Journal of Cultural Heritage Studies
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    • v.52 no.4
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    • pp.154-169
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    • 2019
  • This study attempts to shed light on the nature and purpose of the small melon-shaped celadon ewer that was found in the Sinan shipwreck, focusing on the fact that it has the shape of a ewer, yet could not really have served as a tea or liquor utensil given its small size and unusual shape. We analyzed the shape-related characteristics of other melon-shaped celadon ewers as well as this one; checked the use of similar items unearthed in China and Japan; examined the relevant literature, materials, and paintings; and arrived at the following conclusion. First, it was found that the small melon-shaped celadon ewer was one of a type that was first made in the Southern Song Period in China and continued to be made until the Yuan Period. The artifact displays some differences from many similar relics found in the same shipwreck, particularly its spout, lid, and handle. Second, research on the tea ceremonies and types of liquors prevalent during the Song and Yuan Periods of China, as well as the appearance of this ewer, suggest that it was unsuitable for use as a liquor utensil. Third, we looked at the relevant literature records, paintings, and relics unearthed in China and Japan in an attempt to determine its actual purpose. It is well known that the literati had a deep affection for stationery items, particularly water droppers, which were made in a variety of shapes during the Song Period of China and thereafter. According to literature dating from the Song and Ming Periods, it appears that melon- or ewer-shaped water droppers were used. Certain paintings from the Ming Period depict a small ewer, along with a water dropper, as a stationery item. Looking at paintings dating from medieval Japan, small ewer-shaped objects do not figure among the tea and liquor utensils depicted, whereas kettles with handles and hot water bottles do. Objects known as yeonjeok (a water dropper) were included among the items said to have been made in pottery kilns during medieval Japan. However, a book on flower arrangement of Japan dating from the fifteenth century shows a small ewer, with flowers in it, among the stationery items placed on a desk. Based on this detail, it is concluded that the small melon-shaped celadon ewer from the Sinan shipwreck might have been used as a flower bottle as well as a stationery item.

Design of AOD System for MP3 Copyright Protection (MP3 저작권 보호를 위한 AOD 시스템의 설계)

  • Kim, Yeong-Jun;Kim, Tae-Yun
    • The KIPS Transactions:PartD
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    • v.9D no.2
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    • pp.323-328
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    • 2002
  • In recent years, e-Commerce is very active on the Internet, especially the World Wide Web alone: with the popularization of Internet using high-speed networks. Especially, Circulation of Multimedia Contents like MP3 data if widely being focused as one of the popular researches. However, the existing models of AOD (Audio On Demand) System lack substantial illegal copy protection or copyright protection. In this paper, we propose an AOD System that guarantees substantial illegal copy protection and copyright protection based on the PKI (Public Key Infrastructure). As transmitting MP3 data using the user's public key, the proposed .method prevents the attack of dropper during transmitting data. Also, it guarantees the right of users and distributors by prohibiting illegal users from using MP3 data.

A Study on the Parameter Analysis for the Quantitative Evaluation of Spasticity Implementing Pendulum Test (경직의 정량 평가를 위한 진자실험의 변수분석)

  • Lim, Hyun-Kyoon;Lee, Young-Shin;Cho, Kang-Hee;Chae, Jin-Mok;Kim, Bong-Ok
    • Proceedings of the KSME Conference
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    • pp.268-273
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    • 2000
  • Velocity-dependent increase in tonic stretch reflexes is one of the prominent characteristics of spasticity. It is very important to evaluate spasticity objectively and quantitatively before and after treatment for physicians. An accurate quantitative biomechanical evaluation for the spasticity which is caused by the disorder of central nervous system is made in this study. A sudden leg dropper which is designed to generate objective testing environment at every trial gives very effective environment for the test. Kinematic data are archived by the 3-dimensional motion analysis system($Elite^{(R)}$, B.T.S., Italy). Kinematic data are angle and angular velocity of lower limb joints, and length and lengthening velocity of lower limb muscle. A program is also developed to analyze the kinematic data of lower limb, contraction and relaxation length of muscles, and dynamic EMG data at the same tim. To evaluate spasticity quantitatively, total 31 parameters extracted from goniogram, EMG and muscle model are analyzed. Statistical analysis are made for bilateral correlations for all parameters. The described instrumentation and parameters to make quantitative and objective evaluation of spasticity shows good results.

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