• 제목, 요약, 키워드: Performance test load

검색결과 1,663건 처리시간 0.053초

광주도시철도 전동차의 곡선추종성 및 주행안전성 평가 (Estimation of Curving Performance and Running Safety of Gwangju Electric Multiple Unit for City Subway)

  • 함영삼;오택열
    • 대한기계학회:학술대회논문집
    • /
    • /
    • pp.745-750
    • /
    • 2004
  • For the safety of railway, it should be evaluated for the running safety by measuring the derailment coefficient. Although railway has run the fixed and maintained rail, some of railway is derailed. This report shows the results that performed the static load test, wheelset manufacturing for test, main line running test on the basis of the derailment theory and experience. It is executed main line test into more than 80km/h for estimating the curving performance and running safety of Gwangju EMU. As the test results, could confirm the curving performance and running safety of Gwangju EMU from the results of the wheel unloading, lateral force, derailment coefficient etc. Derailment coefficient was less than 0.8, and lateral force allowance limit and wheel load reduction ratio were enough safe.

  • PDF

강제환기가 적용된 시험공간에서 냉난방부하의 시뮬레이션 및 실증실험 (Simulation and Verification Experiment of Cooling and Heating Load for a Test Space with Forced Ventilation)

  • 김동혁;홍희기;유호선;김욱중
    • 설비공학논문집
    • /
    • v.18 no.12
    • /
    • pp.947-954
    • /
    • 2006
  • Building energy consumption according to the ventilation has been considered to be an important subject. The purpose of this study is to investigate the cooling and heating loads in a test space with a forced ventilating system. In the test space, on/off controlled air-conditioning and forced ventilating facility were operated between 8 : 30 to 21 : 00 during 4 days and some important data like temperatures and energy consumption were measured to obtain actual thermal loads. The simulation was carried out in a mode of temperature level control using a TRNSYS 15.3 with a precisely measured air change amount and performance data of air-conditioner. Heating load and cooling load including sensible and latent were compared between by experiment and by simulation. Both of thermal loads associated with ventilation show a close agreement within an engineering tolerance.

브레이크 부하를 이용한 유체커플링 실험장치 개발과 토크 성능 예측 (The Development of Hydraulic-Coupling Experimental Apparatus Using Brake Load and Prediction of Torque Performance)

  • 박용호;김기홍
    • 한국정밀공학회지
    • /
    • v.17 no.5
    • /
    • pp.100-107
    • /
    • 2000
  • The hydraulic couplings have been widely used in industries, automobile, and power-station drives including ships. A mathematical analysis by which the design and application of hydraulic couplings are made is used in conventional design formulae and general roto-dynamic theories. The fluid flow of hydraulic couplings can be considered to have two component, one circumferentially about the coupling axis, and the other passing fluid from the pump to the turbine in the plane of the coupling axis. Tests have been carried out on the full-scale production coupling. The performance test consists of taking measurement of torque of the fluid coupling for three different amount of working fluid inside with various loads to the output shaft. The purpose of this research is to construct the experimental test equipments and to establish a series of performance test for the domestically developed hydraulic couplings, and to obtain experimental results which can be used to improve the performance of the hydraulic coupling and to solve the practical problems confronted in operation.

  • PDF

신형식 PSC거더의 피로 성능 (Fatigue performance of a new type PSC girder)

  • 최상현;이창수;김태균;어철수
    • 한국철도학회:학술대회논문집
    • /
    • /
    • pp.965-972
    • /
    • 2011
  • Unlike metallic materials, the importance of fatigue performance of concrete has been ignored. However, it is reported that environmental effects, if it cause deterioration, may increase the risk of fatigue failure under repeated loadings. In case of railroad bridges, the risk may increase due to highly periodic, repetitive, heavier nature of train load, which runs through the fixed passage called the track. Especially, when new material or structure is implemented for a main bridge member, experimental validation should be performed to avoid damage or failure due to unexpected behavior. In this paper, the fatigue performance of an IT girder is examined via a repeated loading test. The IT girder is a new type of a prestressed concrete (PSC) girder with two prestressed H-beams in the top of the girder, which provide additional sectional capacity, and it can be applied to the span longer than 30m which is a typical limit for a usual PSC girder. To obtain the fatigue performance, a 10m IT girder specimen is designed, and a repeated load test is performed by applying the cyclic load two million times. The fatigue performance of the girder is examined according to the Japanese and the CEB-FIB design codes. The fatigue test result shows that the IT girder satisfies both design codes.

  • PDF

급속시공용 복합신소재 교량상부구조의 구조 성능 (Structural Performance of an Advanced Compsites Bridge Superstructure for Rapid Installation)

  • 지효선
    • 복합신소재구조학회 논문집
    • /
    • v.1 no.1
    • /
    • pp.34-45
    • /
    • 2010
  • This paper describes the design, manufacturing process, testing, application, and assessment of capacity-ratings of the first all advanced composites bridge on a public highway system. In order to verify the bridge design prior to the field application, a sub-scale bridge superstructure was built and tested in the laboratory. The field load test results were compared with those of the finite element analysis for the verification of validity. To investigate its in-service performance, field load testing and visual inspections were conducted under an actual service environment. The paper includes the presentation and discussion for advanced composites bridge capacity rating based on the stress modification coefficients obtained from the test results. The test result indicates that the advanced composites bridge has no structural problems and is structurally performing well in-service as expected. Since these composite materials are new to bridge applications, reliable data is not available for their in-service performance. The results may provide a baseline data for future field advanced composites bridge capacity rating assessments and also serve as part of a long-term performance of advanced composites bridge.

  • PDF

모노레일 형식 경량전철차량 대차 하중시험에 관한 연구 (A Study on The Load Test of Bogie for Monorail-Type LRT)

  • 김원경;원시태
    • 한국철도학회:학술대회논문집
    • /
    • /
    • pp.939-950
    • /
    • 2011
  • In this study, the load test of rubber tire bogie for monorail type LRT. Bogie for rolling stock in safety operation of the vehicle as an essential core unit before applying to the vehicle safety and reliability should be tested sufficiently. Rubber tire monorail type bogie compared to the traditional bogie wheel lots of formats, the complexity of the load acting static load test, the bogie of the vehicle operation conditions by structural analysis by considering the loading conditions was evaluated by calculating. Test methods and evaluation criteria based on urban rail vehicle performance testing by applying the test were welded parts and materials for the results leading to material fatigue endurance test by applying the result of evaluating the structure has been identified as safe.

  • PDF

주행시험기를 이용한 차륜의 안전성 평가에 관한 연구 (A Study on Safety Evaluation of Wheel Using Roller Rig Tester)

  • 함영삼
    • 한국정밀공학회지
    • /
    • v.32 no.7
    • /
    • pp.591-595
    • /
    • 2015
  • The roller rig tester for safety performance evaluation of wheel derailment is a test facility which can give the test load condition to the test wheel, similar to the actual dynamic condition in actual running condition. This study describes the evaluation result on the durability of the resilient wheel equipped with the ring damper and the damping material, and installed in the half part of a full scaled bogie in combination with the primary spring when it rotates under the dynamic condition. The evaluation result on durability of resilient wheel after load test of 2 million cycles shows that the safety of wheel is not affected by the applied load in visual inspection and nondestructive test, however, in the bolt used for fastening the ring damper to the wheel the loosening was found. Accordingly the use of self-locking nut and washer is recommended.

이코노마이저를 채용한 스크류 냉동기에서 R22와 R407C의 부분부하 성능실험 (Part-Load Performance Test of a Screw Chiller with Economizer using R22 and R407C)

  • 장영수;이용철;김영일
    • 설비공학논문집
    • /
    • v.15 no.11
    • /
    • pp.902-909
    • /
    • 2003
  • Screw compressor type chillers are widely used in refrigeration for capacity over 30 RT. In general, chillers operate under part-load conditions. Therefore, information on characteristics at part-load is very important in view of chiller performance and energy economy. In this study, performance tests of part-load and economizer system using R22 and R407C have been performed for various secondary fluid temperatures. Adoption of an economizer system increased the cooling capacity and improved COP except for lower part-load condition when injection volume ratio is 1.01. For the same cooling capacity condition at part-load, COP of both non-economizer and economizer system showed similar values.

쓰레기 매립층에서 그라운드 앵커의 극한하중 및 하중분포 (Ultimate Load and Load Distribution of Ground Anchor in Waste Landfill)

  • 김성규;조규완;김웅규
    • 한국지반공학회:학술대회논문집
    • /
    • /
    • pp.1434-1441
    • /
    • 2005
  • For anchored system applications, each ground anchor is tested after installation and prior to being put into service to loads that exceed the design. This load testing methodology, combined with specific acceptance criteria, is used to verify that the ground anchor can carry the design load without excessive deformations and that the assumed load transfer mechanisms have been properly developed behind the assumed critical failure surface. After acceptance, the ground anchor is stressed to a specified load and the load is locked-off. The two types of load tests conducted during the research program included performance test and creep test which were carried out in accordance with testing procedures by AASHTO(AASHTO 1990) and FHWA(Weatherby 1998) at Samsung-Dong 00 Site. Form the measurements, ultimate load and creep rate of anchors are proposed for straight shaft pressured grouted anchors in waste landfill. The load distribution on the grout was obtained from the measured strain data at each fraction of the ultimate load during the load tests.

  • PDF

Evaluation of Load Rejection to House Load Test at 50% Power for UCN 3

  • Lee, Chang-Gyun;Suk whun Sohn;Sohn, Jong-Joo;Seo, Jong-Tae;Lee, Sang-Keun;Kim, Youngsung;Nam, Kyu-Won;Jung, Yang-Mook;Chae, Kyeong-Sik
    • 한국원자력학회:학술대회논문집
    • /
    • /
    • pp.398-403
    • /
    • 1998
  • The Load Rejection to House Load test at 50% power was successfully peformed during the UCN 3 PAT period. In this test, all plant control systems automatically controlled the plant from 50% power to house load operation mode. The KISPAC code, which was used in the performance analysis during the design process of UCN 3&4, predictions of the test agreed with the measured data demonstrating the validity of the code as well as the completeness of the plant design.

  • PDF