• Title/Summary/Keyword: Vehicle Pull

Search Result 47, Processing Time 0.042 seconds

Thermal environmental performance evaluation of 4kW power electronic cooling system for commercial vehicle (4kW급 상용차량용 전력전자 냉방장치의 열 환경 성능평가)

  • Han, Keun-Woo;Kim, Seong-Gon;Lee, Chung-Hoon;Choi, Myoung-Hyun;Jung, Young-Gook
    • Proceedings of the KIPE Conference
    • /
    • 2017.07a
    • /
    • pp.290-291
    • /
    • 2017
  • This study deals with an evaluation method for testing the robustness of the 4 kW commercial power electronic cooling system to the thermal environment. The power electronic cooling system consists of a cascaded push-pull DC / DC converter, a three-phase DC / AC inverter, and an electric compressor. The system manufactured by the thermal environment evaluation test (heat distribution test, thermal impact test, high temperature operation test, temperature cycle test, low temperature operation test) for the commercial electric power cooling system for commercial vehicle proves that it is robust against thermal environment.

  • PDF

Structural Analysis of a Composite Target-drone

  • Park, Yong-Bin;Nguyen, Khanh-Hung;Kweon, Jin-Hwe;Choi, Jin-Ho;Han, Jong-Su
    • International Journal of Aeronautical and Space Sciences
    • /
    • v.12 no.1
    • /
    • pp.84-91
    • /
    • 2011
  • A finite element analysis for the wing and landing gear of a composite target-drone air vehicle was performed. For the wing analysis, two load cases were considered: a 5g symmetric pull-up and a -1.5g symmetric push-over. For the landing gear analysis, a sinking velocity of 1.4 m/s at a 2g level landing condition was taken into account. MSC/NASTRAN and LS-DYNA were utilized for the static and dynamic analyses, respectively. Finite element results were verified by the static test of a prototype wing under a 6g symmetric pull-up condition. The test showed a 17% larger wing tip deflection than the finite element analysis. This difference is believed to come from the material and geometrical imperfections incurred during the manufacturing process.

A study on the embossing Height displacement of high speed press bottom point accordance (High Speed Press 하사점 변화에 따른 엠보싱 높이 변화 연구)

  • Kim, Seung-Soo;Kim, Sei-Whan;Lee, Chun-Kyu
    • Design & Manufacturing
    • /
    • v.10 no.2
    • /
    • pp.29-33
    • /
    • 2016
  • Production machines have been more important, due to quality level of vehicle motor core is getting higher. That is why, to improve assembly fit of tooling and to be emphasized how much moving down caused of deterioration of high speed press, it is also getting more important parts as solution of problems. To analyze how much move based on condition of movement as tooling and high speed press, and to measure how much impact to embossing height caused of changing movement down. As the result of investigation, in case of material thickness 0.5mm, there is highest pull and force power when emboss height is 0.45mm. If emboss height is less than 0.45mm, pull and force power is getting lower, if emboss height is higher than 0.45mm, it is impossible to make it forming caused of changed press movement, also it has been piercing.

Development of fundamental technology for dynamic analysis of the high speed EMU (Electric Multiple Unit) (동력분산형 고속철도 주행성능 동역학 해석을 위한 기반기술 개발)

  • Yoon, Ji-Won;Park, Tae-Won;Jun, Kab-Jin;Park, Sung-Moon;Kim, Jung-Bum
    • Proceedings of the KSR Conference
    • /
    • 2008.11b
    • /
    • pp.380-386
    • /
    • 2008
  • The development of a new railway vehicle is under progress through the Next Generation High-Speed Rail Development Project in Korea. Its aim is to develope fundamental technology of the vehicle that can run over 400km/h. The new distributed traction bogie system, 'HEMU'(High-speed Electric Multiple Unit), will be used and is different from that of previously developed high speed railway vehicles. Previous vehicles adopted push-pull type system, which means one traction-car drives rest all of the vehicle. Due to the difference, investigation on dynamic behavior and its safety evaluation are necessary, as a part of verification of the design specification. In the paper, current progresses of researches are presented. And the High-Speed Railway vehicle system is evaluated for a dynamic characteristic simulation. Proper dynamic models including air-suspension system, wheel-rail, bogie and car-body is developed according to the vehicle simulation scenario. The basic platform for the development of dynamic solver is prepared using nodal, modal coordinate system and wheel-rail contact module. Operating scenario is prepared using commercial dynamic analysis program and used for development of dynamic model, which contains many parts such as carbodies, bogies and suspension systems. Furthermore, international safety standard is applied for final verification of the system. Finally, the reliability of the dynamic model will be verified with test results in the further researches. This research will propose a better solution when test results shows a problem in the parts and elements. Finally, the vehicle that has excellent performance will be developed, promoting academic achievement and technical development.

  • PDF

A New Non-isolated Boost Converter with Two-Inductor and One-Transformer for Hybrid Electric Vehicle and Electric Vehicle (하이브리드 차량 및 전기 차량용 두 개의 인덕터와 하나의 변압기를 갖는 새로운 비절연형 부스트 컨버터)

  • Sung, Hyun-Wook;Park, Ki-Bum;Kim, Tae-Sung;Moon, Gun-Woo;Youn, Myung-Jung
    • Proceedings of the KIPE Conference
    • /
    • 2007.07a
    • /
    • pp.132-134
    • /
    • 2007
  • 하이브리드 차량 및 전기차량 구동 모터의 권선저항에 의한 손실 및 모터의 크기를 줄이기 위해 고효율, 고승압형 DC-DC 컨버터 사용이 요구된다. 기존의 부스트 컨버터는 기생저항 성분에 의해 고승압이 불가능하여 변압기를 사용하여 승압비를 향상시킨 current-fed push-pull, current-fed full bridge, dual inductor-fed 부스트 컨버터 등으로 변형되어 사용되어 왔다. dual inductor-fed 부스트 컨버터의 경우 동일조건하에서 앞서 기술된 2가지 컨버터보다 2배의 승압비를 얻을 수 있으며 1차측 전류 스트레스가 낮은 장점을 가지고 있어 대전력, 고승압 응용에 적합하다. 하지만 변압기의 누설인덕턴스에 의한 써지성 전류/전압을 제한하기 위한 부가적인 snubber회로의 사용으로 효율을 떨어뜨리게 되는 단점을 가지고 있다. 본 논문에서는 이러한 단점을 보완할 수 있는 새로운 2개의 인덕터와 1개의 변압기를 갖는 DC-DC 컨버터를 제안한다. 제안된 컨버터의 동작원리와 모드해석을 실시하고 최종적으로 400W, 42Vdc (Battery)/400Vdc (Electric Motor) 실험결과를 통해 이를 검증한다.

  • PDF

Effect of Slip on Tractive Performance of Driving Wheel (구동륜 슬립이 견인성능에 미치는 영향)

  • 박원엽
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.10 no.1
    • /
    • pp.234-243
    • /
    • 2002
  • When a vehicle is operated over sort terrain, torque(or soil thrust) applied to driving wheel brings about shear displacement far soil due to compression and shear failure of soil under tire. This shear displacement give rise to slip and a additional sinkage due to slip. This additional sinkage is usually referred to as slip-sinkage. The slip-sinkage is affected by soil conditions and inflation pressure of tire. This slip-sinkage influence tractive performance on driving wheel . We conducted the experimental study far investigating the effect of slip on sinkage and tractive performance of driving wheel, such as motion resistance, thrust and drawbar pull. The experiment was carried out over three different soil conditions(soft, hard and very hard soil) far a tire with three levels of inflation pressure(120kPa, 240kPa and 360kPa). The results of this study show qualitatively slipsinkage characteristics and slip-tractive performance relationships of driving wheel with soil conditions and inflation pressure of tire.

Design Program Development of the Leaf Spring for Suspension (현가장치용 겹판스프링의 설계프로그램 개발)

  • Choi, S.J.;Choi, Y.C.;Choi, J.C.;Kwon, H.H.
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.3 no.1
    • /
    • pp.20-32
    • /
    • 1995
  • Springs for vehicle suspension control the vibration of a car and influence on the ridability, safety, and life of a car. In the paper, the computer aided design program has been developed, which design the leaf spring shape from the given specifications using basic theory and the expert's knowledge, and the design results are checked by the analysis theory in order to increase the accuracy, and feed back to the design input. For the purpose of easy use, this program consists of pull-down menu and interactive input mode. To prove the effectiveness of this program. two springs, of which one is symmetric, other asymmetric, are designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.

  • PDF

A study on the simulation of flexible robotic assembley cell using petri net (페트리 네트를 이용한 유연 로봇 조립셀의 시뮬레이션에 관한 연구)

  • 임용희;홍지민;이기동;김대원;이범희
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 1992.10a
    • /
    • pp.49-54
    • /
    • 1992
  • A flexible robotic assembly cell is modeled using Petri net. A simulator is developed and used to predict the optimal status of the system. The assembly cell of flexible manufacturing system(FMS) pilot plant of Automation and Systems Research Institute(ASRI) in Seoul National University is modeled. The system consists of 3 robots, 4 conveyors, automatic guided vehicle(AGV) and auto-stacker. The simulator is programmed in Turbo C on IBM PC, supporting a simple graphic simulation with pull-down menu. The flexibility of the assembly cell in the FMS plant is guaranteed, since it is possible to predict the optimal status of the system using this simulator.

  • PDF

Effect of Initial Track Tension on the Tractive Performance of Tracked Vehicles (궤도의 초기 장력이 궤도 차량의 견인 성능에 미치는 영향)

  • 김채주;김경욱
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.5 no.2
    • /
    • pp.1-12
    • /
    • 1997
  • A computer program was developed to simulate effect of the initial track tension on the tractive performance of tracked vehicles. The performance was evaluated in terms of drawbar pull, motion resistance, tractive coefficient and tractive efficiency. Results of the simulation showed that increase in track tension decreases the sinkage and mean maximum pressure in clay, making the ground pressure distribution more uniform. This tendency became more evident when the number of roadwheels increased. However, such change in MMPs was negligible in firm soils. Motion resistance was also decreased with increase in track tension and the number of roadwheels. Under weak soil conditions, tractive coefficient and efficiency increased generally as the track tension increased for a slip range of 10∼30%. For slippage less than 3∼4%, however, the tractive coefficient decreased with increase in track tension. In general, it was known that increasing track tension improves tractive performance in weak soil conditions. However, high track tension can reduce efficiency due to the increment of internal motion resistance caused by increased track tension.

  • PDF

Design Automation of the Compressive Coil Spring (압축코일스프링의 설계자동화)

  • 권혁홍;최선준
    • Journal of the Korean Society of Manufacturing Technology Engineers
    • /
    • v.9 no.6
    • /
    • pp.140-151
    • /
    • 2000
  • Springs for vehicle suspension control the vibration of a car and influence on the ridability, safety, and life of a car. in the paper, the computer aided design program has been developed, which design the leaf spring shape from the given specifications using basic theory and the expert\`s knowledge, and the design results are checked by the analysis theory in order to increase the accuracy, and feed back to the design input. For the purpose of easy use, this program consists of pull-down menu and interactive input mode. To prove the effectiveness of this program, two springs, of which one is symmetric, other asymmetric, are designed and analyzed, and the outputs are compared to the experiments. Considering the tolerance of the given specifications, the results are good.

  • PDF