• Title/Summary/Keyword: transmission analysis

Search Result 5,798, Processing Time 0.034 seconds

Analysis and Countermeasures of 345kV Incheon-TP Overhead Transmission Lines Collapse (345kV 인천화력 송전선로 철탑도괴 원인분석 및 대책)

  • Min, Byeong-Wook;Shin, Tai-Woo;Choi, Jin-Sung;Choi, Han-Yeol;Park, Jae-Ung
    • Proceedings of the KIEE Conference
    • /
    • 2009.07a
    • /
    • pp.323_324
    • /
    • 2009
  • 345kV Incheon Thermal Power Plant Transmission Line Collapse Analysis and Countermeasures. The Typhoon Galmaegi which had been formed in July 15, 2008 diminished into a tropical cyclone and cooled the air above the West Sea. The cooled air colliding with the warm inland air caused a strong whirlwind at some places in the west seaside; the whirlwind battered the 345kV Incheon Thermal Power Plant Transmission Line to be collapsed. The resistance against wind pressure, one of the key elements in transmission line engineering, is designed to endure the pressure corresponding to the maximum instantaneous wind speed. Before the above accident happened, no transmission line has ever been collapsed by a whirlwind. So this paper is aimed to analyze causes that collapsed 345kV Incheon Thermal Power Plant transmission line and to introduce countermeasures.

  • PDF

Analysis on shifting transients of automotive transmission (차량용 변속장치의 변속과도특성 해석)

  • 박영일;이장무
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.14 no.2
    • /
    • pp.44-53
    • /
    • 1992
  • Automotive transmission is the principle component of vehicle driving system, which transmits the adjusted engine power. The automation of transmission arises from the annoyance of transmission operation such as the frequent stop/start of vehicle and the shifting transients. The study on the optimal shifting condition for the automation of transmission needs the investigation of shifting transients. However, the dynamic modeling theory during transient period is not well-established. In this study, the techniques of dynamic modeling for the power transmission system with Merrite-Wilson gear train are presented. To predict the shifting transients, a driving simulation program is developed, and the results of the analysis are cross-checked in the field test.

  • PDF

Crosstalk among three microstrip transmission lines (세 개의 마이크로스트립 전송선로간의 크로스톡)

  • 최재연;이상설
    • Journal of the Korean Institute of Telematics and Electronics D
    • /
    • v.34D no.5
    • /
    • pp.14-21
    • /
    • 1997
  • The crosstalk among three identical uniform coupled microstrip transmissiom lines is examined. To analyze the crosstalk, the simultaneous equations for the voltage and current waves on each transmission line are induced from the transmission line equation. The capacitance and the inductance of the line to solve the transmission line equation are calculated by the spectral domain analysis and the space domian analysis. There are three quasi-TEM modes is three microstrip transmission lines and the characteristics mode impedences in each mode are almost equal at a weak coupling state. The crosstalk among three identical microstrip transmission lines is calculated varying the frequency from 50MHz to 3GHz.

  • PDF

Study on Continuously Variable System Using to Centrifugal Belt Pulley

  • Do, Hyung-jin;Youm, Kwang-Wook
    • International journal of advanced smart convergence
    • /
    • v.9 no.1
    • /
    • pp.10-18
    • /
    • 2020
  • In the case of a belt-pulley type CVT that transmits a driving force by using a variable pulley and a metal belt, slippage occurs due to transmission of power by using a belt, which results in a decrease in efficiency. Therefore, in this study, the rails were machined on the plate surface of the pulley to reduce the friction and slip between the belt and the pulley while applying the characteristics of the CVT. As the plate is rotated by the shape of the rail, a centrifugal belt pulley type continuously variable transmission system which shifts while varying the radius of rotation of the belt that transmits power is studied. Accordingly, the structure of the pulley was designed and the centrifugal belt pulley type continuously variable transmission was Manufactured. In addition, to verify the suitability of the manufactured transmission, the power transmission efficiency was monitored by establishing an interface with the controller. The structural analysis of the plate proved the suitability of the centrifugal belt pulley type continuously variable transmission.

A Study on the Acoustic Transmission Characteristics of Polygon Accumulator (다각형 Accumulator의 음향 특성 연구)

  • Seo, Won-Sik;Kong, Byung-O;Kim, Young-Ho;Nam, Kyeong-Hun
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.33 no.5
    • /
    • pp.653-661
    • /
    • 2009
  • In order to reduce the noise and oscillation, it is consider a matter in all aspects about the noise stem from accumulator and the characteristic of transmission, Transformation of outside shape has change of noise occurrence at transmission process. Therefore, performed sound numerical analysis and conducted an experiment to examine the birthplace of accumulator's external shape change. In a sound numerical analysis, we can fond out transmission loss between inlet and outlet's sound pressure. In an experiment, we can make out transmission loss by sound wave separation theory through drawing sound pressure inlet and outlet.

Analysis on the Decision of Transmission Cost Allocation Rate Using the Arbitration Game (중재게임을 이용한 송전비용배분비율 결정에 관한 분석)

  • Chung, Koohyung;Kang, Dongjoo;Han, Seokman;Kim, Balho
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.54 no.10
    • /
    • pp.496-499
    • /
    • 2005
  • In many parts of the world, the electric power industry is undergoing unprecedented changes. Therefore, in order to reform the electric power industry efficiently and minimize the confusion of this restructuring, the systematic studies related to transmission pricing and transmission cost allocation issues are required essentially. However, even now, the basis of transmission cost allocation rate is not equipped so that the regulation body has determined the allocating rate under the common practice. In this paper, we demonstrate that the decision of transmission cost allocation rate is the regulation body's own right. For this analysis, we apply game theory to the procedure determining this rate and the competition to determine this rate between gencos and distcos is modeled as the arbitration game.

A Cooperative Transmission Strategy using Entropy-based Relay Selection in Mobile Ad-hoc Wireless Sensor Networks with Rayleigh Fading Environments

  • An, Beong-Ku;Duy, Tran Trung;Kong, Hyung-Yun
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.3 no.2
    • /
    • pp.147-162
    • /
    • 2009
  • In this paper, we propose a Cooperative Transmission Strategy using Entropy-based Relay Selection in Mobile Ad-hoc Wireless Sensor Networks(MAWSN) with Rayleigh Fading Environments. The main features and contributions of the proposed cooperative transmission strategy are as follows. First, entropy-based relay selection is used to improve data transmission reliability from a source node to a destination node. Second, we present a theoretical analysis model for the proposed cooperative transmission strategy with the outage probability of the end-to-end performance. The performance of our protocol is evaluated using analysis and simulation.

Transmission Loss Prediction of the High Speed Railway's Wall Section (고속철도 차량 벽면의 투과손실값 예측)

  • Kim, Kwan-Ju;Park, Jin-Kyu
    • Journal of the Korean Society for Railway
    • /
    • v.9 no.1 s.32
    • /
    • pp.1-6
    • /
    • 2006
  • The purpose of this study is to calculate transmission loss of the high speed railway's wall section accurately. Transmission loss measurement of ideal case i.e. the wall in the laboratory condition was carried out in first, which results were compared with those by statistical energy method. Transmission loss values of high speed railway calculated out by experimental method are compared with those from closed form solution. Commercial statistical energy analysis was also used to predict the outside pressure level using those measured transmission loss values. Simple SEA model could estimate reasonable exterior sound pressure level.

Assemblability Analysis of the Kinematic Configurations of Ravigneaux-Type Automatic Transmissions (라비뇨 타입 자동변속기의 기구학적 구성에 대한 조립 가능성 분석에 관한 연구)

  • Kwon, Hyun Sik
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.18 no.3
    • /
    • pp.49-58
    • /
    • 2019
  • Automatic transmissions are standard equipment in most automotive vehicles because they provide smooth speed shifting and a compact design with multiple speed ratios. Their structure consists mainly of planetary gear sets as power-transmitting devices and brakes and clutches as shifting devices. Several forward and one reverse speed ratios are achieved by actuating shifting devices to connect gears, input and output shafts, and the transmission case. In the development of a new transmission, kinematic configurations reflecting the transmission concept design are required, and the ability of the new concept design to be assembled without any interference among the connections must be demonstrated. In this study, an assemblability analysis of the kinematic configurations of a Ravigneaux-type automatic transmission was conducted with an assemblable example of an 8-speed Ravigneaux-type automatic transmission.

Analysis of Electromagnetic Pulse Coupling to Twisted Cable Using Chain Matrix (Chain Matrix를 이용한 Twisted Cable의 EMP(Electromagnetic Pulse) 결합 해석)

  • Cho, Jea-Hoon;Lee, Jin-Ho;Kim, Hyeong-Dong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.21 no.7
    • /
    • pp.734-743
    • /
    • 2010
  • In this paper, we analyzed the EMP coupling for the nonuniform transmission lines, such as twisted cables, using the chain matrix algorithm and the multi-conductor analysis. The BLT method is widely used for the EMP coupling analysis of the transmission line, however, it is difficult to apply to the nonuniform transmission lines. In order to analyze the EMP coupling of nonuniform transmission lines, the whole nonuniform transmission line is divided into incremental uniform line sections of the finite numbers, and the coupling in each small sections is now summed up to get the EMP coupling effect of the entire nonuniform transmission line. To verify the proposed EMP coupling analysis method, the result of the EMP coupling simulation is compared with the solution of BLT equations for a uniform transmission line case. The proposed method is applied to the twisted cable over ground in case of being illuminated by the HEMP in order to analyze the EMP coupling.