• Title/Summary/Keyword: Test method of performance

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Round Robin Test for Performance Demonstration System of Ultrasonic Examination Personnel (초음파검사자 기량검증 체제를 위한 다자비교시험)

  • Yoon, Byung-Sik;Yang, Seung-Han;Kim, Yong-Ho;Kim, Yong-Sik;Yang, Dong-Soon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.24 no.4
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    • pp.378-383
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    • 2004
  • The Korean Performance Demonstration(KPD) System for the ultrasonic testing personnel, equipments and procedures applicable to the Class 1 and 2 piping examination for nuclear power plant in Korea has been established. A round robin test was conducted in order to compare the examination results by the method of Performance Demonstration(PD) with the traditional dB-drop method. The round robin test shows that the reliability of the PD method is better than that of the dB-drop method. As a result, adoption of the PD method to the in-service inspection of the nuclear power plants will improve the reliability of the ultrasonic test results.

Implementation & Application of Instrumentation System on Performance Evaluation for Korea-Radio Train Control System (통신기반 열차제어시스템 성능평가용 계측시스템 구현 및 적용)

  • Lee, Jae-Ho;Lee, Kang-Mi;Park, Pyoung-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1777-1783
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    • 2013
  • This study aims to implement an instrumentation system measuring and analysing real-time data of information flow between respective subunits composing train control system as the performance evaluation method for wireless communication based urban railway train control system under development for a Korean model. It analyses system functional requirements regarding subsystems composing wireless communication based train control system and test items for functions presented in each specification and examines data and measurement point for measuring according to test items in order to implement an instrumentation system. And, it clearly defines requirements of an instrumentation system to avoid malfunction or error in operation of train control system. It reviews data processing method and display method for effective analysis of data flow between respective subunits with measured data, designs and makes an instrumentation system. Ultimately, it applies to a performance test of train control system and makes sure an instrumentation system in normal working order.

The Optimization Study on the Test Method of Remanufactured Power Steering Oil Pump by Using FMEA (FMEA를 활용한 재제조 파워스티어링 오일펌프 시험법에 대한 최적화 연구)

  • Seo, Youngkyo;Jung, Dohyun;Yu, Sangseok;Rha, Wanyong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.1
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    • pp.90-98
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    • 2016
  • Currently government certified test method for an automobile remanufactured products is insufficient. Thus many automotive parts in the remanufacturing market are lacking proper evaluation criteria and production of defective products are causing customer dissatisfaction. In this paper a power steering oil pump, which requires stringent manufacturing standards, is studied by the failure mode and effect analysis approach. The research suggested that the test criteria such as discharge flow characteristic test, tightness test, pulley run-out test, pressure switch operation test, low temperature test and rotation pressure durability test should be performed to evaluate the reliability of remanufactured power steering oil pumps. As a result of tests, the performance of remanufactured power steering oil pump satisfied the evaluation criteria of pressure switch operation test and low temperature test. However, the remanufactured power steering oil pump failed to satisfy the evaluation criteria on discharge performance test, tightness test and pulley run-out test. These performance evaluation tests proved the necessity of standard process for the remanufactured power steering oil pump.

Analysis of CA Certification Performance Test Results and Improvement of CA Test Method for a Better Differentiation of Gas Removal Performances for Room Air Cleaners (공기청정기 CA 규격성능시험 결과 분석 및 가스시험 변별력 향상 방안연구)

  • Kim, Hak-Joon;Han, Bangwoo;Kim, Yong-Jin;Cha, Sung-Il
    • Particle and aerosol research
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    • v.7 no.3
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    • pp.87-97
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    • 2011
  • In this study, we organized the test results obtained from the performance tests for the CA certificated air cleaners which had been commercially available in Korea since 2003, and analyzed the correlation among the test parameters such as flow rate, particle collection efficiency, clean air delivery rate (CADR), ozone emission, odor removal efficiency and noise level etc. The noise level of 267 air cleaners were increased as concentrated at the 45, 50, 55 dB, which are the required noise level for CA certification according to flow rate, and ozone emissions from the CA air cleaners were significantly lower than the requirement limit, 50 ppb for 24 hour operation. The average particle collection efficiency and odor removal efficiency were 89.3 and 80.8%, approximately 20% higher than the requirement of CA certification, regardless of flow rates. The particle removal performance of an air cleaner was clearly discriminated by its CADR, and the CADR was obtained with a simple calculation: 0.79 x flow rate. The low differentiation of gas removal performance of air cleaners by the current CA gas test method was improved by 3.2, 751.3, 13.4 times for ammonia, acetic acid, respectively, by adopting the CADR concept and the real time measurement method, FTIR, for gas removal performance test.

Factors Influencing Impact of Smart Factory Adoption (스마트공장 도입의 효과에 영향을 주는 요인들)

  • Sun-Woo Kim;Jung-Suk Oh
    • Journal of Service Research and Studies
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    • v.13 no.1
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    • pp.1-26
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    • 2023
  • We analyze the effects and related factors of Smart Factory adoption. 110 and 325 samples were collected by median-size-industry matching method, respectively, of adopting and non-adopting companies. We use financial statement data (ROA, etc.) from the year before adoption to the fourth year after adoption. Abnormal operating performance and annual abnormal changes are obtained according to event study method, and analyzed by Wilcoxon signed-rank test and t-test. ROA and sales growth rate demonstrate short-term effects after adoption, but not long-term effects. As a result of regression analysis to examine if the three factors of labor intensity, R&D intensity, and prior financial performance have moderating effect, the moderating effect of R&D intensity and prior financial performance is confirmed. In addition, we perform regression analysis to confirm performance effects of early and late adoptions and whether prior financial performance and organization size have moderating effect. It is confirmed that the later the time of adoption, the greater the effect of adoption in the long term and the moderating effect of prior financial performance and organization size is confirmed.

Shake Table Test on Seismic Performance Evaluation of the Bolted Connection Type Paneling System with Exterior Finish Material (외부마감재가 부착된 볼트접합 방식 패널링 시스템의 내진성능평가를 위한 진동대 실험)

  • Oh, Sang Hoon;Park, Jong Won;Park, Hae Yong
    • Journal of the Earthquake Engineering Society of Korea
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    • v.22 no.1
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    • pp.23-32
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    • 2018
  • In this study, we conducted a shake table test to verify the seismic performance of the paneling system with steel truss composed of bolt connections. The control group was set to the traditional paneling system with steel truss connected by spot welding method. Test results showed that the bolted connection type paneling system has excellent deformation capacity without cracking or brittle fracture of the steel truss connection parts compared to the welding type paneling system. Furthermore, in the bolted connection type, slight damage occurred at the time of occurrence of the same story drift angle as compared with the existing method, it is considered that it has excellent seismic performance. In compliance with the performance-based design recommended for the current code (ASCE 41-13) on non-structural components, it is judged that in the case of the bolted connection type paneling system, it can be applied to all risk category structures without restriction. However, in the case of traditional paneling system with spot welding method, it is considered that it can be applied limitedly.

A Comparison Study on the Engine Performance Test Regulation of Two-wheeled Vehicles between EU and Korea (유럽과 한국의 이륜차 엔진 성능 시험 규정에 대한 비교 연구)

  • Lee, Gwang Goo;Yong, Geejoong
    • Journal of Auto-vehicle Safety Association
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    • v.8 no.3
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    • pp.22-27
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    • 2016
  • As a preliminary research to provide amendment for the engine performance test regulation of two-wheeled vehicles, the engine performance data are investigated in terms of maximum torque, rated power, and engine speed of motorcycles on sales in Korean market. Based on the engine performance database officially published to consumers, some forecasted problems are discussed when the maximum torque and the rated power are measured under the present test standards. EU and Korea regulations on engine performance test are carefully compared in terms of the accuracy of measurement devices, test procedures including data acquisition method, and allowable range of rated power measurement. Complementary items are discussed to eliminate ambiguities in the present regulation and to construct rational regulation system.

SHIP RESISTANCE AND PROPULSION PERFORMANCE TEST USING HYBRID MESH AND SLIDING MESH (Hybrid mesh 및 sliding mesh를 이용한 선박 저항추진 성능 시험)

  • Lee, Ju-Hyun;Park, Bum-Jin;Rhee, Shin-Hyung
    • Journal of computational fluids engineering
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    • v.15 no.1
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    • pp.81-87
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    • 2010
  • In this study, we conducted resistance and propulsion performance test of ship composed of the Resistance Test, Propeller Open Water Test and Self Propulsion Test using the CFD(Computational Fluid Dynamics). We used commercial RANS(Reynolds Averaged Navier Stokes equation) solver, as a calculating tool. The unstructured grids were used in a bow and stern of ship, having complex shape, for a convenience of generating grids, and the structured grids were adopted in a central hull and rest of hull having a relatively simple shape which is called hybrid grid method. In addition, The sliding mesh method was adopted to rotate a propeller directly in the Propeller Open Water and Self Propulsion Test. The Resistance Test and Self Propulsion Test were calculated using Volume of Fluid (VOF) model and considering a free surface. And all The three cases were applied realizable k-epsilon model as the turbulence model. The results of calculations were verified for the suitability of calculations by comparing MOERI's EFD results.

An experimental study on the development and verification of NCC(new concrete cutting) system

  • Park, Jong-Hyup;Han, Jong-Wook
    • Structural Engineering and Mechanics
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    • v.65 no.2
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    • pp.203-211
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    • 2018
  • This paper introduces the development process of NCC(New Concrete Cutting) system and analyzes first verification test. Based on the first verification test results, some problems of NCC system have been newly modified. We carry out the second verification test. We tried to verify cutting performance and dust control efficiency of NCC system through the cutting test of concrete bridge piers. In particular, this verification test strives to solve the problem of concrete dust, which is the biggest problem of dry cutting method. The remaining dust problems in cutting section tried to solve through this verification test. This verification test of the NCC system shows that the dust problem of dry cutting method is closely controlled and solved. In conclusion, the proposed NCC method is superior to the dry cutting method in all aspects, including cutting performance, dust vacuum efficiency and cooling effect. The proposed NCC system is believed to be able to provide eco-friendly cutting technology to various industries, such as the removal of the SOC structures and the dismantling of nuclear plants, which have recently become a hot issue in the field of concrete cutting.

A Study on Performance Evaluation Plan of Next-Generation High-Speed Prototype Train during Test Run (차세대고속열차 본선 시운전 성능평가 방안에 대한 연구)

  • Kim, Sang-Soo;Choi, Snng-Hoon;Park, Choon-Soo;Kim, Seok-Won;Kim, Ki-Hwan
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1814-1820
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    • 2010
  • Korean Train Express (KTX) has been commercially operating and achieving elevation on transport capacity since 2004. And the first hish-speed prototype test train, HSR-350x, was developed and succeeded in testing of running over 350km/h. Now KTX-II based on HSR-350x was started in service run. The new high-speed train development project, HEMU-400x project, has started since 2007. The protype train is being designed and manufactured. After the train are developed completely, it will run on the commercial line and will be test to verify the estimated performance. The authors devised the performance evaluation method and process of the HEMU-400x prototype system. And we introduce the definite performance test items and the method to vitrificate them in this paper.

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