• Title/Summary/Keyword: Measurement and verification

Search Result 930, Processing Time 0.03 seconds

Measurement System of the Thermal Diffusivities for Porous Materials under Vacuum Conditions (진공환경에서 다공성 소재의 열확산도 측정 시스템)

  • Kong, Cheol-Won;Nam, Gi-Won;Yi, Yeong-Moo;Ohnishi, Akira
    • Aerospace Engineering and Technology
    • /
    • v.10 no.1
    • /
    • pp.39-44
    • /
    • 2011
  • A system of measurement for the thermal diffusivity of porous materials was developed. Although there are several measurement systems for thermal diffusivity, it is typically difficult to measure the thermal diffusivity of porous materials. This paper presents a measurement system for thermal diffusivity that utilizes a cyclic heating method along with the verification of the measured device. To verify the cyclic heating method, the available reference data of aceramic specimen was utilized. To apply the system to an actual porous material, polystyrene foam was tested. The thermal diffusivity of the polystyrene foam under vacuum was reduced by 63%. The measured values from both tests were in good agreement with the reference values, as they were within 10% of these values.

Evaluation of Prediction Methods for Containment Integrated Leakage Rate (격납건물 종합누설률 예측방법 평가)

  • Yang, Seung-Ok;Lee, Kwang-Dae;Oh, Eung-Se
    • Proceedings of the KIEE Conference
    • /
    • 2004.11c
    • /
    • pp.562-564
    • /
    • 2004
  • The containment leakage rate test performed on the nuclear power plants consists of following phases : pressurizing the containment, stabilizing the atmosphere, conducting a Type A test, conducting a verification test, depressurizing the containment. It takes more than 48 hours from the pressurization to the depressurization and the prediction of the results will help to prepare the next test phase. In this paper, to predict the leakage rate, the prediction methods based on the least square method are evaluated according to the input variables and the measurement period.

  • PDF

A Study on Traction System Characteristics of High-Speed Train

  • Han, Young-Jae;Kim, Ki-Hwan;Seo, Sung-Il;Park, Chan-Kyoung;Han, Seong-Ho;Kim, Jong-Young;Kno, Ae-Sook
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 2003.10a
    • /
    • pp.1724-1726
    • /
    • 2003
  • Korean High-Speed Train (350km/h), composed of 2 power cars, 2 motorized car and 3 trailer cars, has been developed and is under trial test. To verify the design requirements for the functions and traction performances of the train, KRRI (Korea Railroad Research Institute) decided to evaluate traction performances of the train during trial test. For this purpose, torque, velocity, voltage and current must be measured. KRRI has developed a measurement system that can measure vast and various signals effectively. In this paper, we introduce traction performances of Korean High-Speed Train. The traction measurement items are focused on the verification of motor block performances. Motor block consists of 2 motors. By this test, we verified traction performances of Korean High-Speed Train.

  • PDF

A Study on the Rolling Resistance of Trains through real Measurement (실측에 의한 열차의 주행저항에 관한 연구)

  • CHANG, Dong Il;LEE, Sung Uk
    • Journal of Korean Society of Steel Construction
    • /
    • v.8 no.3 s.28
    • /
    • pp.47-54
    • /
    • 1996
  • Recently Sucessive progress in train technic has enabled us to constructed high-speed railways for ourselves. This caused more rapid train more pressure on a track and speedier track break-down. Especially in the construction of high-speed rails for high-speed traveling and safety accurate breaking distance is essential and not only computation of rolling resistance in theory but also verification through real measurement are important in basic material for breaking and starting load caused during the train running. In this study, we measured traveling resistance and calculated traveling resistance formula in the case of the SAEMA-EUL which consists of main part of current passenger trains and frights in this country.

  • PDF

Traction Characteristic of Korean High Speed Train (한국형 고속철도차량의 견인특성)

  • Han, Young-Jae;Kim, Seng-Won;Si, Sung-Il;Baik, Kwang-Sun;Hwang, Jun-Guk;Kno, Ae-Sook
    • Proceedings of the KIEE Conference
    • /
    • 2003.04a
    • /
    • pp.432-434
    • /
    • 2003
  • The korean high speed train(350km/h), composed of 7cars that are 2 power cars, 2 motorized car and 3 trailer cars, has been developed and is under on-line test. To verify the design requirements about the functions and traction performances of this train, KRRI(Korea Railroad Research Institute) decided to evaluate traction performances of the train during on-line test. For this purpose, such as torque, velocity, voltage and current, must be measured. KRRI has developed the measurement system that can be measured vast and various signals effectively. In this paper, we introduce traction performances of korean high speed train. The traction measurement items are focused on the verification of motor block performances.

  • PDF

Ambient Vibration Measurement of Buildings Horizontal Vibration Using a Mobile Phone Application (휴대폰 앱을 이용한 건물 수평진동의 상시진동계측)

  • Moon, Sang-Hyouen;Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
    • /
    • v.15 no.3
    • /
    • pp.77-83
    • /
    • 2015
  • The cases of conducting the vibration measurement using the mobile phone with regard to the building's horizontal vibration are very rare in Korea and foreign countries. Therefore, this study analyzed the horizontal vibration nature of the building using the mobile phone targeting 5 tall buildings, and reviewed about the applicability of the mobile phone vibration measuring instrument through the comparison/verification with the data of the existing vibration measuring instrument. The peak of the measured time series waveform was measured clearly and it showed a similar value to the existing natural frequency.

A Study for on-Line Test of Electric Devices in KHST (KHST 차량 전기장치의 본선시운전시험에 관한 연구)

  • 한영재;김기환;목진용;김종영;이병석;최종선;김정수
    • Proceedings of the KSR Conference
    • /
    • 2003.10a
    • /
    • pp.138-143
    • /
    • 2003
  • KHST(Korean High-Speed Train, 350km/h), composed of 7 cars that are 2 power cars, 2 motorized car and 3 trailer cars, has been developed and is under on-line test. To verify hte design requirements about the functions and traction performances of this train, KRRI(Korea Railroad Research Institute) decided to evaluate traction performances of the train during on-line test. For this purpose, such as torque, velocity, voltage and current, must be measured. BRRI has developed the measurement system that can be measured vast and various signals effectively. In this paper, we introduce traction performances of KHST. The traction measurement items are focused on the verification of motor block performances.

  • PDF

Dynamic Characterization of Large-scale Structures through Mobile-phone Application (휴대폰 애플리케이션을 통한 초대형 구조물의 동적특성 분석)

  • Jung, Young-Seok;Yoon, Sung-Won
    • Journal of Korean Association for Spatial Structures
    • /
    • v.15 no.4
    • /
    • pp.99-105
    • /
    • 2015
  • The serviceability design of the high-rise building is affected by the wind response vibration such as the acceleration, at this time it is important to calculate the natural frequency correctly. Since the suggestion equation of the natural frequency being used in the design phase is not the regression equation obtained from the vibration measurement of the high-rise building, the verification to use for the serviceability design of the high-rise building is necessary. This thesis conducted an ambient vibration measuring on the high-rise building through the mobile-phone application to calculate the natural frequency and suggested a natural frequency approximate expression following the building's height, and compared with the domestic/foreign standard and the result of the eigen-value analysis.

The enhancement of 3-dimensional positioning accuracy by measuring error factors for CNC machine tools (공작기계의 오차요소 측정을 통한 3차원 위치정밀도 향상)

  • 손진욱;서석환;정세용;이응석;위현곤
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 1994.10a
    • /
    • pp.260-265
    • /
    • 1994
  • Efforts have been devoted to developing rapid and accurate methods for measuring the errors of machine tools. The method os measurement and calibration of machine tool errors should be general and efficient. The objective of this study is to show in detail the full sequence from the measurement of errors factors to the verification of the positioning accuracy after compensation for the volumetric error. In this paper, we described the steps in measuring the volumetric error parameters, a general error model composed of error parameters, temperature, and the desired position. The validity of the error calibration methods proposed in this paper was tested using a vertical 3-axis CNC machine with a laser interferometer and a ball bar.

  • PDF