• Title/Summary/Keyword: High-speed trains

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U sing Artificial Intelligence in the Configuration Design of a High-Speed Train (인공신경망을 이용한 고속철도의 최고속도 예측과 구성설계)

  • 이장용;한순흥
    • Korean Journal of Computational Design and Engineering
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    • v.8 no.4
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    • pp.222-230
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    • 2003
  • Artificial intelligence has been used in the configuration design stage of high-speed train. The traction system of a high-speed train is composed of transformers, motor blocks, and traction motors of which locations and number in the trainset should be determined in the early stage of the train conceptual design. Components of the traction system are heavy parts in the train, so it gives strong influence to the top speeds and overall train configuration of high-speed trains. Top speeds have been predicted using the neural network with the associated data of the traction system. The neural networks have been learned with data sets of many commercially operated high-speed trains, and the predicted results have been compared with the actual values. The configuration design of the train set of a high-speed train determines the basic specification of the train and layout of the traction system. The neural networks is a useful design tool when there is not sufficient data for the configuration design and we need to use the existing data of other train for the prediction of trainset in development.

Effects of mud-flap parameters on aeroacoustic noise generation inside high-speed trains (풍동을 이용한 고속열차 머드플랩 형상변경에 따른 공력소음 특성 분석)

  • Ryu, Ji-Myung;Park, Jun-Hong;Park, Ki-Hyoung;Song, Si-Mon;Choi, Sung-Hoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.469-472
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    • 2007
  • Aeroacoustic sound induced from inter-couch spacing is an important contributor to interior noise generation for high speed trains. Especially the open space between mud-flap has significant impact from flow-structure interactions. To understand noise generation mechanism, experiments were performed using the wind tunnel. To find mud-flap parameters for minimal noise generations the various shape of the mud-flap was installed and its effects on the wall-pressure generation were investigated.

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A Neural Multiple LMS Based ANC System for Reducing Acoustic Noise of High-Speed Trains (신경회로망 다중 LMS 기법을 이용한 고속철도의 실내소음저감을 위한 ANC 시스템)

  • Cho, Hyun-Cheol;Lee, Kwon-Soon;Nam, Hyun-Do
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.385-390
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    • 2009
  • This paper presents a novel active noise control (ANC) system using least mean square (LMS) algorithm and neural network approach for decreasing acoustic noise signals inside high-speed trains. We construct a LMS framework as a nominal ANC system and additionally design an artificial single-layered perceptron model as an auxiliary ANC which is aimed to reduce real-time residuary noise due to its nonstationary and uncertain nature. Parameter vector of the hybrid ANC is determined through online estimation to realize an adaptive ANC configuration by means of the steepest descent algorithm. We achieve simulation experiment to demonstrate the proposed ANC system employing realistic acoustic noise signals measured in Korea Train eXpress (KTX).

State-of-the-Art on the Indoor-Noise Characteristics of High Speed Train (고속전철의 실내소음특성에 관한 연구현황분석)

  • 이우식;박철희
    • Journal of the Korean Society for Railway
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    • v.2 no.3
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    • pp.18-25
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    • 1999
  • A high speed train named Korean High Speed Train (KHST) with its maximum operating speed 350 km/h is now under development. For the successful design of a quiet and comfortable high speed train, it is important to understand the general features of the noise and vibration characteristics of high speed train. This paper reviews extensively collected materials on the noise and vibration characteristics of existing high speed trains. Based on the noise and vibration characteristics of TGV systems, a simple indoor-noise prediction rule is proposed for the TGV-type high speed trains such as KHST The indoor-noise of KHST at 350km/h is expected to be larger than at least 71 dBA. Some important researches conducted for designing KHST during last two years under the G-7 project are also briefly introduced at the last part of this paper.

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A Study about aerodynamic characteristics of High speed train by fore-body shape design (고속전철의 형상에 따른 공력특성 연구)

  • 진원재;이봉래
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.735-738
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    • 1997
  • The aerodynamic charateristics of high speed train can be improved by fore-body design. In this paper, the design a fore-body shape which has optimal aerodynamic charateristics, 6 models of fore-body shape are proposed and the change of aerodynamic characteristics is studied through calculations of flow field around high speed train fro each fore-body shape. The flow field around high speed trains are calculated using Navier-Stokes equation. The variational trends of aerodynamic characteristics are studied from the result of flow calculation around high speed trains for 6 fore-body shapes.

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Noise Prediction and Design of Soundproof Facilities for the High Speed Train (고속열차(TGV) 주행시 연변에서의 소음예측 및 방음시설설계)

  • ;J. P. Clairbois
    • Journal of KSNVE
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    • v.9 no.6
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    • pp.1106-1115
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    • 1999
  • This paper sums up the study of the soundproof facilities (noise barriers) to be placed on the test track section within the Seoul-Pusan H.S.T. project. The objective of this study is to determine optimum design of soundproof including height, length, location, sound absorbing materials for test track(chonan-taejon). This paper shows the model to design the shape and materials of noise barrier for high speed trains(TGV, ICE, ect). The design of soundproof facilities is to be conducted by MITHRA for the prediction of noise impact of the TGV and for optimising noise barriers in order to reduce the noise generated by high speed trains. A number of computer simulations are carried out in order to determine the specification of noise barrier on test track.

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Technologies for Robotized Welding of Big Aluminium Structures with Tolerances for High Speed Trains (고속 열차용 대형 알루미늄 부품의 GAP 대응 로봇 자동화 용접 기술)

  • Lee, Sang Chul
    • Journal of Welding and Joining
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    • v.31 no.1
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    • pp.33-37
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    • 2013
  • Robotized MIG welding of large aluminium components for high speed trains is state-of-the-art. The implementation of online laser cameras enables seam tracking and adoptive modification of welding parameters. A constant fill is achieved regardless of the gap tolerances. Friction Stir Welding has been introduced to the market as a reliable and fast joining technology. The advantages of high welding speeds and the elimination of arc light, fumes and liquefaction in the welding spot lead to economical realisation of heavy-duty gantry systems. FSW robots offer a high flexibility with regard to welding of curved parts, and can be equipped with laser cameras for exact joint tracking.

Design Optimization of a Traction Motor for High Speed Trains (고속전철용 견인유도전동기의 최적화 설계에 관한 연구)

  • 권병일;박승찬;김병택;곽승용;이기호;윤종학;김근웅;이상우
    • Proceedings of the KSR Conference
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    • pp.179-186
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    • 1998
  • Three phase squirrel cage induction motor is generally adopted as a traction motor to drive high speed trains because of its robustness for surrounding environment and easy maintenance. In the design of traction molar, reduction of weight is very important in order to reduce kinetic energy to accelerate the vehicle. Therefore, in this paper, design variables of a preliminary designed traction motor to minimize its weight is determined using the optimization technique. Before the optimization process, rotor slot number is determined to reduce vibration and noise by the analysis of magnetic force. As a result, a design example to reduce weight by 12% than that of the preliminary designed motor is presented.

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Technological overview of the main converter/inverter between HEMU-400X and abroad High Speed Trains (HEMU-400X와 해외 주전력 변환장치 시스템기술 분석)

  • So, Jin-Sub;Lee, Young-Yeob;Lee, Jin-Houng;Son, Kyoung-So;Lee, Jong-Ho;Kook, Moon-Seok;Yun, Cha-Jung
    • Proceedings of the KSR Conference
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    • pp.567-573
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    • 2009
  • The technologies of the main converter/inverter, which is indispensable for securing a safety and reliability of traction performance in rolling stock, have been compared and analyzed between HEMU-400X and High Speed Trains in Japan, France and Germany through this study. The result of this study indicates that home and abroad technologies aim at a small-sized and lightweight main converter/inverter as well as the prevention of noise in electric ventilator.

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Design of the Feed Forward Controller to improve on the non-interference control performance of a single PWM converter in parallel for high-speed trains (고속전철용 단상 병렬 컨버터의 비간섭제어 성능 개선을 위한 전향 제어기 설계)

  • Park, Byoung-Gun;Jung, Hwan-Jin;Hyun, Dong-Seok
    • Proceedings of the KSR Conference
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    • pp.179-184
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    • 2008
  • This paper presents the design of the feed forward controller to improve on the non-interference control performance of a single PWM converter in parallel for high-speed trains. The feed forward controller is designed to minimize the interference generated by converter switching in parallel operation of PWM converters. The gain value of the feed forward controller is calculated by inductance values of the input transformer. However, it is difficult to decide this gain value exactly because inductance values are changed by the operation condition of an input transformer. In this paper, the proposed design of feed forward controller can exactly decide the gain value using the leakage inductances estimated by detecting the variation of input current. the validity of the proposed feed forward controller is proved through the simulation results.

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