• Title/Summary/Keyword: Wire Length

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A STUDY ON THE CHANGES OF THE ELASTIC PROPERTIES TN LOOPED WIRES BY VARIABLE FACTORS (변환요소에 따른 LOOPED WIRE의 탄성 변화에 관한 연구)

  • Na, Yong-In;Kim, Sang-Cheol
    • The korean journal of orthodontics
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    • v.25 no.3 s.50
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    • pp.263-271
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    • 1995
  • The purpose of this study nab to evlauate and compare the effect of the variable factors of wire on the elastic properties of looped rectangular wire. Five variable factors were presented-material(Hi-T, blue Elgiloy), wire size(.016'$\;\times\;$.022', .018'$\;\times\;$.025'), loop length(15mm, 20mm), loop configuration(open loop, closed loop), gabling (non-gable, gable). So, the total 256 specimens were divided into 32 groups, and each of those nab pulled on Instron testing machine. The load-deflection curve of each wire obtained, from which force, range in elastic limit, and stiffness were computed and analyzed statistically. The results were obtained as follows : 1. All of the variable factors - wire material, size, loop length loop configuration, and gabling - took a significant effect on load-deflection rate of looped wire. 2. The force at elastic limit was the smallest in the group of Hi-T, .016'$\;\times\;$.022', 20mm loop length, open loop, non-gable, and the largest in the group of blue Elgiloy, .018'$\;\times\;$.025', 15mm loop length, closed loop, non-gable. 3. The range at elastic limit was the smallest in the group of Hi-T, .018'$\;\times\;$.025', 15mm loop length, open loop, non-gable, and the largest in the group of HI-T, .016'$\;\times\;$.022', 20mm loop length, closed loop, gable. 4. Loop configuration and loop length were the most effective factors on the elastic properties of looped wires, and gabling was the least effective.

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Experimental Study on The Propagation Characteristics of Lightning Surge According to Variation of Wire Length (배선 길이 변화에 따른 뇌서지 전파 특성에 대한 실험 연구)

  • Seo Ho-Joon;Rhie Dong-Hee
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.12
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    • pp.616-619
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    • 2004
  • Electrical circuits with semiconductor are very weak against lightning surge. The surge protective devices for electronic circuit and AC power lines are becoming more widely used. To achieve effective method of surge protection, there are needs for correlation between lightning surge and indoor wire length or installation height of indoor wire. The aim of this present work is to investigate the propagation characteristics of lightning surge according to variation of wire length. As a consequence, the maximum voltage at the end of the open wire in proportion to length of indoor wire. Therefore this result may be raw data for establishment of surge protection system.

Analysis of Frequency Response Depending on Wire-bonding Length Variation (Wire-bonding의 길이 변화에 따른 주파수별 특성 분석)

  • Gwon, Eun-Jin;Mun, Jong-Won;Ryu, Jong-In;Park, Se-Hoon;Kim, Jun-Chul
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.551-552
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    • 2008
  • This paper presets a results of frequency response in variation of wire bonding length. A gold ball bonding is used as a wire bonding process, and a DPDT(double pole double thru) switch is adapted as a device for test. Wire length is ranged from 442um to 833um and a measured frequency range is from 1 GHz to 6 GHz. Little difference are measured in insertion loss and return loss depending on wire length. Measured S21 and S11 are -0.58 dB and -17.7 dB, respectively. S21 insertion loss is rising up and S11 insertion loss is falling down as the frequency is increased.

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A Feasibility Study for Estimating Prestressed Stress on a Steel Wire Using Permeability of Magnetic Flux (자속투과율을 이용한 부착식 PSC 강선의 긴장응력 추정 타당성 연구)

  • Kim, Byeong Hwa;Joh, Chang Bin;Lee, Do Hyung
    • Journal of the Earthquake Engineering Society of Korea
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    • v.17 no.5
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    • pp.219-225
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    • 2013
  • This work examines the feasibility for estimating existing tensile stress on a stressed wire using the permeability of magnetic flux. A closed magnetic circuit has been constructed to induce magnetic flux inside a steel wire. With different tension stress levels on a wire, the permeability of magnetic flux on the wire has been measured. Two different experimental case studies have been conducted for the examination of sensitivity of permeability of magnetic flux on the stressed wire. One is a varying-length stress test, and the other is a fixed-length stress test. The results show that the permeability of magnetic flux in the varying-length stress test is inversely proportional to the applied stress, while the permeability in the fixed-length stress test is linearly proportional to the applied stress on the stressed wire. It is thus expected that the permeability of magnetic flux on a wire can be a promising indicator for the inspection of its tensile stress.

Wideband modulation analysis of a packaged semiconductor laser in consideration of the bonding wire effect (실장된 반도체 레이저의 본딩와이어를 고려한 광대역 변조 특성 해석)

  • 윤상기;한영수;김상배;이해영
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.33A no.2
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    • pp.148-162
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    • 1996
  • Bonding wires for high frequency device packaging have dominant parasitic inductances which limit the performance of semiconductor lasers. In this paper, the inductance sof bonding wires are claculated by the method of moments with incorporation of ohmic loss, and the wideband modulation characteristics are analyzed for ddifferent wire lengths and structures. We observed the modulation bandwidth for 1mm-length bonding wire lengths and structures. We observed the modulation bandwidth for 1mm-length bonding wire is 7 GHz wider than that for 2mm-length bonding wire. We also observed th estatic inductance calculation results in dispersive deviation of the parasitic inductance and the modulation characteristics from the wideband moment methods calculations. The angled bonding wire has much less parasitic inductance and improves the modulation bandwidth more than 6 GHz. This calculation resutls an be widely used for designing and packaging of high-speed semiconductor device.

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Investigation of the Causes of Uncooled Region Induced at Top End in Wire Rolling Process (선재압연에서의 소재선단 미수냉부 발생원인 규명)

  • Son, Boong-Ho;Yoo, Jea-Sang
    • Proceedings of the KIEE Conference
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    • 2000.07d
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    • pp.2516-2518
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    • 2000
  • In order to reduce the trimming loss for water cooling zone next to finishing block mill in wire rolling, the operational data related to the crop length control of uncooled region was acquired and analyzed. The time deviation of water cooling spray nozzles and the immoderate preset length of uncooled wire rod result in the excessive trimming loss. Therefore, the preset length of uncooled wire rod at each cooling zone are established. The test results of #3 wire rolling mill turned out to be good enough to be expected to increase the ratio of products about 0.15% and establish operational standards of cooling zone.

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Development of cutting length control systems for crop loss minimization of head end in wire rolling process (선재압연공정에서의 선단부 crop loss최소화를 위한 절사량 제어시스템 개발)

  • 이상호;손붕호
    • 제어로봇시스템학회:학술대회논문집
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    • 1997.10a
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    • pp.1493-1495
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    • 1997
  • Cropping of head and tail ends of rod in wire Rolling Process is required to aviod roll damage, and prevent cobbles. In order to reduce the crop loss, the new crop control system for rotary shear of Wire rolling Process has been developed. Performance shows the developed system cut precisely within setting length. As a result, it is expected to increase the yield ratio of products about 0.2 percent and stabilize the operantional condition.

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

  • Chang, Sang-Hoon;Lee, Ki-Won;Kwon, Sam-Young;Park, Jae-Woong
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.932-939
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    • 2011
  • This paper deal with technique of tension length calculation for 350km/h high speed catenary system. Tension length affects in facility investment. Possibility of overlap increasing a tension length and the equipment investor decreases in order to decrease. Considers the parameter which specifies and the grudge which is possible long the fact that decides a tension length is the aim which is important plans overhead contact line. The element which decides a tension length with next following; (i) Operating range of tension device, (ii) Change of the horizontal tension which affects possibility of the effect which operates to the line and span, (iii) Tension of wire material the tensile force which is relation, (iv) Wire thermal expantion which relates with a standard temperature, (v) Curve radius, (vi) Wind velocity, (vii) Thermal range of overhead contact wire and mechanical design of tension mechanism etc.

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Transmission Characteristics & Analysis of Ignition Voltage According to Its Conductor Length from the Ballast to the HID Lamp (HID램프와 안정기 사이의 전선 길이에 따른 이그니션 전압 전달특성 분석)

  • Bang, Sun-Bae;Kim, Chong-Min;Han, Woon-Ki;Im, Byeong-No;Jang, Mog-Soon
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.3
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    • pp.148-154
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    • 2007
  • In this paper, characteristics of ignition voltage and current by wire length of HID(High Intensity Discharge) lamp circuit are analyzed. In the construction field, decision of the wire thickness for HID lamp circuit has the problems, and these are presented. Through transmit parameters, equivalent model of the ballast and HID lamp circuit was derived. The graph of voltage reduction about length between the ballast and the lamp is shown. The simulation of proposed model and experimental results are presented in order to validate the proposed method. The proposed model and graph can use to choose the proper length of wire between the ballast and the lamp in the field.

Full Pose Measurement of a Robot by the Wire Parallel Mechanism (와이어 병렬 메카니즘에 의한 로봇의 완전 자세 측정)

  • Jeong, Jae Won;Kim, Soo Hyun;Kwak, Yoon Keun
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.5
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    • pp.134-142
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    • 1997
  • In this study, we proposed the wire parallel mechanism that can be used to measure a full pose of a robot. It is composed of six parallel links using wire. The position and orientation of the end effectorf of a robot are calculated using the length of wires which is measured by the encoder. The complex non- linear equations of the forward kinematics are solved by using a numerical method, and the unique solution is obtained from the geometric configuration of the device. The length error of the wire which occurs in static condition is compensated by the relational equation that considered longitudinal extension and defoection of the wire. Through this work, we known that the proposed device has a good accuracy( .+-. 0.01mm) in a large measuring region, so it can be used effectively in a callibration of a robot which required a low cost.

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