• Title/Summary/Keyword: test system

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Reliability Evaluation of Torque Generator (토크 발생기의 신뢰성 향상)

  • Jung, D.S.;Lee, Y.B.;Park, J.W.
    • Journal of Power System Engineering
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    • v.16 no.6
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    • pp.59-65
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    • 2012
  • Torque Generator is a product which has function to transform hydraulic energy to mechanical energy of torque and rotating speed, and be used for direction change device of agricultural machines. This study proposes failure analysis and test analysis on torque generator and introduces a process that reliability of a product is enhanced by design improvement. And also it presents improvements of maximum output torque by modifying design and surface treatment. Lastly it verifies reliability improvement by analyzing test results of before and after life test.

Integrated Test for Propulsion System of Space Launch Vehicle (우주 발사체 추진기관 종합 시험)

  • Cho, Sang-Yeon;Kim, Sang-Heon;Bershadesky, V.;Oh, Seung-Hyub
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.797-800
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    • 2011
  • For the space launch vehicle, propulsion system is the most important subsystem among others. For the evaluation of development level for rocket engine, integrated system test performed in appropriate facility is needed. In this study, test article and major parameters for certifying the propulsion system of launch vehicle were reviewed.

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Development of Fuzzy Rule-based Liver Function Test Diagnosis System (퍼지 규칙기반 간 기능 검사 해석 시스템의 개발)

  • Kim, Jong-Won;Oh, Kyung-Whan
    • Proceedings of the KOSOMBE Conference
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    • v.1992 no.05
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    • pp.155-160
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    • 1992
  • Liver function test is one of the most common tests for diagnosis and follow-up of patients and for heal th screening. Automatic interpretation and suggestions on the diagnostic possibilities contribute to shorten the interpretation time of the test results and help to provide qualified health care. Fuzzy logic has been recently introduced and being spread for these purposes. The present study aims at model Ins the foray rule-based laboratory diagnosis system. The fuzzy rule-based laboratory diagnosis system was applied to the diagnosis regarding liver function test. The system was evaluated by comparing with the stepwise multivariate discriminant function analysis, which showed similar results, and the overall accuracy of the fuzzy diagnosis system was about 80%.

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Design & system construction of insulation on the traction motor for EMU (철도차량용 견인전동기의 절연설계 및 절연시스템 구성)

  • 왕종배;홍선호;조연옥;김명룡
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.194-197
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    • 2001
  • Traction motors driven by high speed switching inverters is demanded higher operating temperature, severe duty cycles, higher starting current, frequent voltage transients and finally severe environmental exposure. For applications to inverter duty, traction motors needs a special insulation system, which has characteristics of increased bond strength, lower operating temperature and higher turn-to-turn insulation. In this paper, design considerations and manufacturing procedure of 200 Class insulation system with polyimde(Kapton) main insulation and silicone resin VPI process on the traction motor for EMU will be reviewed. And performance test and long life evaluation test which prove stability and long life evaluation test which prove stability and reliability of insulation system for traction motor will be introduced.

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A Study on the Development of the Automatic Performance­Test­machine for Power Steering Pump (파워스티어링 펌프의 자동 성능 시험기 개발에 관한 연구)

  • 정재연;정석훈
    • Tribology and Lubricants
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    • v.19 no.6
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    • pp.335-341
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    • 2003
  • Recently, the automotive industry is being developed rapidly. On this, a demand of high quality performance­test­machine is increased too. But it is progressive technology that must be combined hydraulic, mechanic and electronic technologies. To construct this system, the design of oil hydraulic circuit, interface skill between sensor and personal computer, data acquisition & display system and integrated control are very important skill. Moreover, reliable data is obtained with vacuum system and complex heat exchange system. Therefore, in this study, we designed a performance­test­machine by using above key technologies and we also made a integrated PC control system using personal computer which is more progressive and flexible method than PLC control.

Evaluation of Behavior Characteristics of Geosynthetic Fiber Nail System from the Field Pull-Out Tests (현장인발시험을 통한 섬유형 쏘일네일의 거동특성 평가)

  • Kim, Hong-Taek;Park, Si-Sam;Cho, Byeong-Guk;Jung, Sung-Pil
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.342-347
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    • 2004
  • Excavation nearby the existing structures is being performed vigorously to get the greatest use of land along with fast economic growth in the downtown area. The application of soil nailing system gradually increases because of an advantage of soil nailing system adjacently constructed in the existing structures. In this study, friction resistance by pull-out is considered as main resistance except resistance formed by flexural rigidity of nail observing that resistance of flexural rigidity is about $0{\sim}15\;%$ of whole safety factor according to degree of flexural rigidity in general soil nail wall and application of geosynthetic fiber soil nailing system is evaluated through laboratory tensile strength test and field pull-out test.

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The study of propulsion control system (추진제어장치 특성 연구)

  • Kwon Il-Dong;Kim Dong-Myung;Chung Eun-Sung;Lee Sang-Jun;Choi Jong-Muk
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.291-298
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    • 2005
  • This paper describes the characteristic feather of propulsion system adopting mass production. The train formation is composed of 4 cars by 2 Motor cars and 2 Train cars. Acceleration rate must be 3.0 km/h/s or more when the car starts up to 35km/h by 16ton of passenger load. The system information supervision is easy because the system is controlled to perfect digital circuits, all information of an action is stored in a memory and is managed. The control system is composed of a fully digital circuit and a high level software such as C language. The DSP TMS320C31 is used for main processor and has the capability of 50MHz, 32bit floating point operation and has a C compiler. Therefore, the implementation of control algorithm and the change of function are easy. VVVF inverter using IGBT conducted variable combined test, environment test using chamber, interface test and field test etc.

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BIST Design for Hazard controller in Pipeline System (Pipeline 시스템의 Hazard 검출기를 위한 BIST 설계)

  • 이한권;이현룡;장종권
    • Proceedings of the IEEK Conference
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    • 2003.11b
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    • pp.27-30
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    • 2003
  • The recent technology developments introduce new difficulties into the test process by the increased complexity of the chip. Most widely used method for testing high complexity and embedded systems is built-in self-test(BIST). In this paper, we describe 5-stage pipeline system as circuit under testing(CUT) and proposed a BIST scheme for the hazard detection unit of the pipeline system. The proposed BIST scheme can generate sequential instruction sets by pseudo-random pattern generator that can detect all hazard issues and compare the expected hazard signals with those of the pipelined system. Although BIST schemes require additional area in the system, it proves to provide a low-cost test solution and significantly reduce the test time.

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Development of Excitation System for Class 1E (Class 1E용 여자시스템 개발)

  • Shin, Man-Su;Lee, Joo-Hyun;Ryu, Ho-Seon;Lim, Ick-Hun;Jeong, Tae-Won
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1953-1954
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    • 2008
  • The excitation system for class 1E has been developed to apply to the nuclear power plant emergency diesel generator by utilizing the existing digital excitation system. The additional mission was to evaluate the excitation system of safety. It is the safety analysis of the excitaton system, the verification test, the aging test, the safety requirement test and so on. The verification test is classified of hardware and software part for detail.

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The Assessment of TRACS(Traffic Adaptive Control System) (교통대응 신호제어 시스템의 효율성 평가)

  • 이영인
    • Journal of Korean Society of Transportation
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    • v.13 no.1
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    • pp.5-33
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    • 1995
  • This paper addresses the outlines of the traffic signal timing principles engaged in TRACS and the results of field test. Research team, encompassing research institute, university, and electronic company, conducted the three-year project for developing the new system, named TRACS(Traffic Adaptive Control System). The project was successfully completed in 1994. TRACS aims at accomplishing the objectives of better traffic adaptability and more reliable travel time prediction. TRACS operates in real-time adjusting signal timings throughout the system in response to variations in traffic demand and system capacity. The purpose of TRACS is to control traffic on an area basis rather than on an isolated intersection basis. An other purpose of TRACS is to provide real-time road traffic information such as volume, speed, delay , travel time, and so on. The performance of the first version of TRACS was compared to the conventional TOD control through field test. The test result was promi ing in that TRACS consistantly outperformed the conventional control method. The change of signaltiming reacted timely to the variation of traffic demand. Extensive operational test of TRACS will be conducted this year, and some functions will be enhanced.

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