• Title, Summary, Keyword: Performance test load

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Damage inspection and performance evaluation of Jilin highway double-curved arch concrete bridge in China

  • Naser, Ali Fadhil;Zonglin, Wang
    • Structural Engineering and Mechanics
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    • v.39 no.4
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    • pp.521-539
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    • 2011
  • Jilin highway concrete bridge is located in the center of Jilin City, which is positioned in the middle part in Jilin Province in the east north of China. This bridge crosses the Songhua River and connects the north and the south of Jilin City. The main purpose of damages inspection of the bridge components is to ensure the safety of a bridge and to identify any maintenance, repair, or strengthening which that need to be carried out. The damages that occur in reinforced concrete bridges include different types of cracks, scalling and spalling of concrete, corrosion of steel reinforcement, deformation, excessive deflection, and stain. The main objectives of this study are to inspect the appearance of Jilin highway concrete bridge and describe all the damages in the bridge structural members, and to evaluate the structural performance of the bridge structure under dead and live loads. The tests adopted in this study are: (a) the depth of concrete carbonation test, (b) compressive strength of concrete test, (c) corrosion of steel test, (d) static load test, and (e) dynamic load test. According to the damages inspection of the bridge structure appearance, most components of the bridge are in good conditions with the exception arch waves, spandrel arch, deck pavement of new arch bridge, and corbel of simply supported bridge which suffer from serious damages. Load tests results show that the deflection, strain, and cracks development satisfy the requirements of the standards.

Performance Test of Double-Bumped Air Foil Bearings (이중범프 공기포일베어링의 성능시험)

  • Kim, Young-Cheol;Lee, Dong-Hyun;Kim, Kyung-Woong
    • Tribology and Lubricants
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    • v.25 no.2
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    • pp.108-113
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    • 2009
  • This paper presents a experimental results for the performance evaluation of a double-bumped air foil bearing. The test results of a double-bumped AFB is compared with a single-bumped AFB at a heavily-loaded condition. The diameter of the test bearing is 50 mm, and the axial length is 50 mm. Nominal clearance of the single-bumped AFB is evaluated as $105{\mu}m$, and that of the double-bumped AFB is as $95{\mu}m$. The test of the AFBs are demonstrated at 3 test mode; the load variation mode, the speed variation mode, and start-stop mode. The single-bumped AFB demonstrated a upward load-carrying capacity of 95 N and a downward load-carrying capacity of 130 N at 20,000 rpm. The double-bumped AFB demonstrated a upward load-carrying capacity of 170 N and a downward load-carrying capacity of 170 N at 20,000 rpm. The single-bumped AFB demonstrated a downward lift-off speed of 16,300 rpm at 105 N. The double-bumped AFB demonstrated a downward lift-off speed of 15,400 rpm at 105 N. The start-stop test of the AFBs assure 5,000 cycle endurance life. The test results are compared with the theoretical calculation results. The test and theorectical results show thata double-bump air foil bearing provides a higher load-carrying capacity, stiffness and damping than a single-bump air foil bearing in a heavily-loaded condition.

Assessment of Structural Performance for a Lightweight Soundproof Tunnel Composed of Partitioned Pipe Truss Members (격벽화된 파이프 트러스 요소로 구성된 경량방음터널의 구조적 성능 평가)

  • Noh, Myung-Hyun;Ahn, Dong-Wook;Joo, Hyung-Joong
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.7 no.1
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    • pp.1-8
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    • 2016
  • In this paper, the full-size structural performance test for a lightweight soundproof tunnel composed of partitioned pipe truss members is carried out to investigate the structural performance. In addition, a nonlinear structural analysis of the same finite element model as the full-size testing model is performed to compare the test result. The test and analysis results showed that the lightweight soundproof tunnel ensures the structural safety against wind loads, snow loads and load combinations. As a result, the full-size test and analysis results meet all the design load conditions, hence the proposed lightweight soundproof tunnel is ready for the field application.

Traffic Generator for Performance Test of the TDX-10 Packet Handler (TDX-10 패킷처리기의 성능척정을 위한 트래픽발생기의 설계)

  • 정중수;전경표
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.3
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    • pp.411-417
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    • 1995
  • Packet switching is an important aspect of ISDN. In the TDX-10 switching system, which is being developed as an ISDN exchange in Korea, the packet switching function is implemented on the basis of Case B scenario of X.31. After implementing the packet switching function the performance test must be executed to check whether the design objectives of performance are satisfied or not. However, it is not easy to set up test environment for performance measurement under full load conditions. This paper presents the design of the traffic generator which enables us to do performance test of the TDX-10 packet handler under full load conditions. To generate packet traffic we change only software programs without any change of the hardware system of the packet handler.

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Performance Evaluation of Seismic Stopper using Structural Analysis and AC156 Test Method

  • Ryu, Hyun-su
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.26 no.3
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    • pp.277-285
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    • 2020
  • Recently, studies have been actively conducted on seismic design and improvement of the seismic performance of bridges, buildings, factories, and plants. In particular, heavy items that are being manufactured or waiting to be shipped from factories (such as generators, engines, and boilers) must be equipped with seismic stoppers to prevent them from moving or falling during an earthquake. Seismic stoppers should be suitably determined by the size and weight of these heavy items; however, they have no general design standard. In this study, structural analyses and seismic tests were conducted to evaluate the performance of newly designed seismic stoppers. Structural analysis was performed on three stopper models to estimate the external load at which the yield stress of the material was not exceeded. Based on the analysis results, a seismic test of the stopper was carried out in accordance with the AC156 test method. Finally, product specifications for all three seismic stopper models were determined and their static/dynamic load performance was evaluated.

Static load test and dynamic characteristics analysis of bogie and body structures of an oil tank (유조화차의 대차 및 구조체 하중시험과 동특성 해석 연구)

  • 홍재성;함영삼;백영남;오택열;김길동
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.780-783
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    • 2003
  • In this study, As The Tae Yang Metal company manufactured oil tank inserts welding structure bogie, it is Contributed in stability security of freight car of oil tank through static load test, dynamic characteristics analysis. vibration performance test etc. to verify intensity of bogie frame & body structure

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A Study on the Operation Performance of Diesel Engine by using of Soybean Oil Fuel (디젤엔진의 콩기름연료에 의한 운전성능에 관한 시험)

  • 이기명
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.18 no.4
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    • pp.4259-4264
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    • 1976
  • This paper, is about the test on the operating performance of diesel engine by using of soybean oil which farmers could supply in their farm yard. The diesel engine used is a swirl-chamber type, four stroke cycle with single cylinder, air cooling and its rated horse power is 2 PS per 1300 rpm. Several results obtained are as follows; 1. The starting performance of diesel engine with soybean oil is almost the same as that with light oil. 2. The variation of engine speed according to various engine load is small when soybean oil is used compared with light oil. It is considered that soybean oil is desirable for the purpose of industerial power machine fuel. 3. The specific fuel consumption increases approximately 10 percent high in the condition of rated horse power and maximum horse power and shows less or same during the load test in low velocity, when soybean oil is used 4. Though the brake thermal efficiency in the condition of rated horse power and maximum horse power is inclined to decrease when soybean oil is used compared during the load test in low velocityt shows good inclination.

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Design of an Automatic Test System for Electronic Equipments in Vehicles (승용차용 전장시험 자동화 시스템 설계)

  • 이창훈;김유남
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.1
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    • pp.131-138
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    • 2001
  • The performance analysis of an electronic equipment test is very complicate due to the variety o vehicles. In this study, automatic design system for the electronic equipment test has been carried out using the standard load patterns. For the test, standard signal patterns for each item are modeled. The test items can be decided by the user by means of these patterns. Also, engineering software modules are developed and proved to be very efficient for analyzing the test results statistically. Experiments are performed for the test system in the vehicle assembly line. By analyzing the test results, it is found that bad samples can be detected without failure. Also, the engineering software modules provide an analytical tool for the automation of the test process.

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Structural Strength Evaluation of a Carbody by Finite Element Analysis and Tests (구조해석 및 시험에 의한 경량화 차체 구조강도 평가)

  • Yoon S.C.;Kim W.K.;Jun C.S.;Kim M.Y.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.49-54
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    • 2005
  • This paper describes the result of structure analysis and load test of body structure. The purpose of the analysis and test is to evaluate an safety which body structure shall be considered fully sufficient rigidity so as to satisfy proper system function under maximum load and operating condition. Material of body structure applied an aluminum alloy. Body structure consist of side frame, under frame, roof frame, end frame. Both FEM analysis and load test are based on 'Performance Test Standard for Electrical Multiple Unit, noticed by Ministry of Construction & Transportation, in 2000' and reference code is JIS E 7105. The test results have been very safety and stable fer design load conditions.

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Evaluation of Friction Torque for a Turbopump Ball Bearing (터보펌프 볼 베어링의 마찰 토크 평가)

  • Jeon, Seong-Min;Kwak, Hyun-Duck;Kim, Jin-Han
    • Tribology and Lubricants
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    • v.27 no.1
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    • pp.25-33
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    • 2011
  • Rolling contact ball bearings are utilized almost exclusively for liquid propellant rocket engine turbopump. Turbopump ball bearings are required to endure high speed and high load for a poor lubricated condition in cryogenic environment. To evaluate bearing heat generation performance, friction torque is investigated as a function of rotation speed, bearing load and cooling flow rate through an experimental study using water coolants. Radial and axial loads are simultaneously applied to the test bearing by gas pressurized cylinder rod. Endurance performance of bearing has been also verified under the bearing required load for operating condition during total accumulated test time 2,100 sec.