• Title, Summary, Keyword: Performance test load

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Estimation of PTC (Powertrain Cooling) Performance with Heat Rejection Rate (열방출량 (Heat Rejection Rate)을 이용한 PTC (Powertrain Cooling) 성능 추정)

  • Min, Sunki
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.3030-3034
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    • 2015
  • It is important to consider powertrain cooling performance, when engine is applied to new vehicle. If the performance is poor, engine will be damaged by overheating. But, the development timing of engine is faster than timing of vehicle, it is difficult to test the cooling performance of new engine and vehicle. In this study the powertain cooling performance was estimated with some test and calculation data. First, the heat rejection test was conducted. From this test, the heat rejection data at required rpm and load was acquired. Second, coolant flow test was conducted. From this test coolant flow rate to radiator was measured. Then engine torque and rpm was calculated from vehicle load and speed. Vehicle load and speed was calculated from test mode. Then by comparing these data, the powertrain cooling performance was estimated.

Fatigue characteristics of the IT girder for railroad (철도교용 IT거더의 피로특성)

  • Choi, Sang-hyun;Lee, Chang-soo
    • Journal of the Society of Disaster Information
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    • v.6 no.1
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    • pp.140-152
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    • 2010
  • In designing a railroad bridge, the fatigue is one of the main factors to be considered for ensuring safe operation. Especially, for a new type of a structural member, which has not been adopted to railroad bridges, the fatigue performance should be checked. In this paper, the fatigue characteristics of an IT girder are examined. The IT girder is a new type of a prestressed concrete girder which has two prestressed H-beams in the top of the girder to give the girder additional sectional capacity. To obtain the fatigue performance, a 10m IT girder specimen is designed, and a repeated load test is performed by applying the load cyclically two million times. The magnitude of the repeated load is determined considering the stress level under the service condition. During the test, static load tests are performed to identify the stiffness degradation. The fatigue performance of the girder is checked according to the Japanese and the CEB-FIB design codes. The fatigue test result shows that the IT girder satisfies both design codes.

Ductility and Seismic Performance of Spirally Reinforced Bridge Columns (나선철근 원형교각의 연성 및 내진성능)

  • 이재훈
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.356-363
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    • 2000
  • The objectives of this study are to investigate seismic performance of spirally reinforced bridge columns and to provide test result for developing improved seismic design criteria. Quasi-static test was conducted for 12 columns of which variables were transverse reinforcement ratio and spacing, longitudinal reinforcement ratio, and axial load level. Sufficient seismic performance was observed from the test for the columns with greater confinement steel amount than the requirement of the Korean Bridge Design Specification. The columns with 0.84% of the confinement steel requirement provided adequate performance under less than 0.2 of axial load level, but showed lower ductility under 0.3 of axial load level. The current provision for the region of confinement steel distribution may be non-conservative under high axial load level, therefore a modified provision is proposed.

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A Study on Structural Integrity and Dynamic Characteristic of Inertial Load Test Equipment for Performance Test of Railway Vehicle Propulsion Control System (철도차량 추진제어장치 성능시험을 위한 관성부하 시험설비의 구조안전성 및 동특성 평가 연구)

  • Jang, Hyung-Jin;Shin, Kwang-Bok;Lee, Sang-Hoon;Lee, Dae-Bong
    • Journal of the Korean Society for Railway
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    • v.13 no.4
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    • pp.363-370
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    • 2010
  • This paper describes the evaluation of structural integrity and dynamic characteristic of inertial load test equipments for performance test of railway vehicle propulsion control system. The propulsion control system of railway vehicle has to be confirmed of safety and reliability prior to its application. Therefore, inertial load test equipments were designed through theoretical equation for performance test of propulsion control system. The structural analysis of inertial load test equipments was conducted using Ansys v11.0 and the dynamic characteristic was evaluated using Adams. The results showed that the structural integrity of inertial load test equipment was satisfied with a safety factor of 10.2 on the bearing part under combined load. Also, the structural stability of flywheel according to dynamic simulation was secured by the maximum oscillation displacement within 0.83mm.

Evaluation of Load Rejection to House Load Test at 100% Power for YGN 4

  • Sohn, Jong-Joo;Jeong, Won-Sang;Chi, Sung-Goo;Seo, Jong-Tae;Kim, Si-Hwan
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.588-595
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    • 1995
  • The Load Rejection to House Load test at 100% power was successfully performed during the YGN 4 PAT period. In this test, all plant control systems automatically controlled the plant from 100% power to house load operation mode. The LTC code, which was used in the performance analysis during the design process of YGN 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.

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A Study on the Fire Resistance Performance of Reinforced Concrete Columns according to Axial Load Ratio (축력비 조건에 따른 철근콘크리트기둥의 내화성능에 관한 연구)

  • Hwang, Kyu-Jae;Cho, Bum-Yean;Yeo, In-Hwan
    • Fire Science and Engineering
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    • v.27 no.6
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    • pp.26-31
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    • 2013
  • This study, to evaluate the technology of the fire resistance design of Reinforced Concrete columns based on fire resistance performance design, was suppose to use as basic data for performance design through a measure of temperature and deformation using heat transfer analysis and Heat-load test of the Reinforced Concrete columns as parameter is the axial load ratio. In accordance with axial load without eccentricity, the load ratio of 0.30, 0.35, 0.40 and 0.47 were imposed on columns. As a result of this study, 0.40 or more of axial load ratio can be ensured that the fire resistance performance was considered satisfactory.

Structural Performance of Flexural Members Enlarged with Epoxy Mortar System at Soffit (변형에폭시계 재료를 사용한 하부증대 보의 구조적 성능)

  • 홍건호;조하나;신영수;정혜교
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.833-838
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    • 1998
  • This paper is aimed to investigate structural performance of flexural members enlarged with epoxy mortar at soffit. Main test variables are steel ratio and interface treatment method and six test beams are tested to investigate the effect of each test variables on maximum load capacity, load-deflection and moment-curvature relationship, interface behavior and failure mode. Test results show that section enlarged beams can carry almost same load of the monolithic beams with same size and the flexural stiffness and cracking moments are increased about 2.5 times and 50 to 70%of failure moment in comparison with same sized control beam, respectively. However, deflections and curvatures are decreased at the same load and interface fractures are not discovered at the ultimate load.

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Calculation of Limit Temperature on H-Beam Flexural Member Through the Thermal Stress Analysis under the Lateral Load (재하된 H형강 휨재의 열응력해석을 이용한 한계온도 산정)

  • Yoon, Sung Kee;Lee, Chy Hyoung;Koo, Bon Hoon
    • Journal of Korean Society of Steel Construction
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    • v.27 no.4
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    • pp.387-397
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    • 2015
  • The domestic fire resistance performance test is conducted as a prescriptive design method such as quality test. In quality test there are 2 methods, unloaded fire resistance test and fire resistance test under load. In realistic, these tests, however, have problems with expense, time and diversity of structure. This study reviewed fire resistance performance of H-beam flexural member by thermal stress analysis using finite element ABAQUS program. This research is for the performance-based design reviewing applicability of domestic standard. As a result of this study, limit temperatures per each load ratio provied for proper performance of fire resistancy.

A Case Study for Improving Performance of A Banking System Using Load Test (부하테스트를 이용한 금융 시스템의 성능개선 사례)

  • Kim, Tai Suk;Lee, Jong Yun;Kim, Jong Soo
    • Journal of Korea Multimedia Society
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    • v.18 no.12
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    • pp.1501-1508
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    • 2015
  • In this paper, we describe a case study to improve performance through the load testing of multi-tired system for financial accounts before the system opening. The load test was conducted after the data collection tools(Performance Monitor, DB PSSDiag) were installed. By analyzing the collected log, we were able to identify the main sector requiring performance improvements among the presentation tier, web tier, business logic tier and data tier. The ASP.NET server-down on the web tier could be improved by modifying the parameter values in the configuration file. Some server downs occurred on the business logic tier when a large number of users access at the same time, were more difficult to be solved. By analyzing the hang-dump at the server-down time, we were able to find a process that caused the problem. and we had to modify the relevant codes. For major performance improvements of the data-tier, indices of some queries was optimized by using the built-in DBMS query analyzer, after analyzing the log of long-response-time queries. The problems and solutions considered in this case study will be a reference for the performance improvement of a multi-layer system with the similar structure.

Vibration Fatigue Analysis of Automotive Fuel Tank Using Transfer Function Method (Transfer Function Method를 이용한 자동차 연료탱크의 진동 피로 해석에 대한 연구)

  • Ahn, Sang Ho
    • Journal of Auto-vehicle Safety Association
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    • v.12 no.3
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    • pp.27-33
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    • 2020
  • In this paper, the process of predicting efficient durability performance for vibration durability test of automobile parts using vibration test load on automobile fuel tank is presented. First of all, the common standard load that can be applied to the initial development process of the automobile was used for the fuel tank and the vulnerability of the fuel tank to the vibration fatigue load was identified through frequency response analysis. In addition, the vulnerability of the fuel tank was re-enacted through vibration durability test results, and the scale factor was applied to the standard load. In order to predict the vibration durability performance required for detailed design, vibration fatigue analysis was performed on the developed vehicle with the frequency of vibration severity equivalent to the durability test, and the vulnerability and life span of the fuel tank were identified through the process of applying weights to these selected standard loads, thereby reducing the test time of the development vehicle.