• 제목, 요약, 키워드: Performance test load

검색결과 1,663건 처리시간 0.102초

경전철 차량 개발을 위한 차체 강도 평가 (Carbody strength evaluation for a light rail vehicle)

  • 김진혁;박근수;박상규
    • 한국철도학회:학술대회논문집
    • /
    • /
    • pp.466-473
    • /
    • 1998
  • LRV(Light Rail Vehicle) is one of the most useful way for urban transit. HDPIC has designed and manufactured the LRV train set for Manila Line 1 expansion. The LRV is composed of two carbody sections which are coupled by a articulated bogie. The articulated bogie and two motorized bogies have slewing rings in order to improve the curving performance and ride quality. Carbody structures are mainly made of low-carbon stainless steel (STS301L), and the carbody bolsters and draft sills are made of rolled steel for welded structures. The authority's specifications specified the design load conditions and weight limits. Design load conditions are vertical load, compressive load and diagonal jacking, and the maximum axle load is 10.7 ton. In order to meet those requirements, the stiffness and strength of carbody structure were predicted using finite element analysis during design stage. The half or full structure is modeled and analyzed with design load conditions, and critical areas are analysed in detail using sub-modeling method. The strength and strength of carbody structure was also verified by the load test. The analysis and test results show a good agreement.

  • PDF

초기재령 강섬유보강 철근콘크리트 보의 구조성능 평가 및 개선 (Improvement and Evaluation of Structural Performance of Steel Fiber Reinforced Concrete Beams Using Early Age Concrete)

  • 하기주;신종학;곽윤근;권칠성
    • 한국구조물진단유지관리공학회 논문집
    • /
    • v.3 no.3
    • /
    • pp.129-137
    • /
    • 1999
  • Reinforced concrete structures using early age concrete were result in the degradation of structural performance due to crack, overload, unexpected vibration and impact load. It demands urgently that reinforced concrete structure using early age concrete should be improved the serviceability and structural performance with the application of new fiber materials. Therefore specimens, designed by the test varibles, such as with or without stirrup and percent of steel fiber incorporated, were constructed and tested to evaluate and develop the structural performance of reinforced steel fiber concrete beam. Based on the test results reported in this study, the following conclusions are made. Specimens, designed by the over 0.75% of steel fiber incorporated, were showed the ductile behavior and failed slowly with flexure and flexure-shear. Comparing with the load-displacement relationship of specimen BSS, designed by the recommendations of the Ministry of Construction and Transportation, reinforced steel fiber concrete beam using early age concrete, over 0.75% of steel fiber incorporated, gets enough load carrying capacity and ductility. Increasing the percent of steel fiber incorporated(0.25~2.0%), the ultimate shear stress of each specimen were increased 12~40% than that of control specimen SSS.

  • PDF

고로슬래그 미분말 및 순환잔골재를 적용한 PVA섬유 보강 철근콘크리트 보의 구조성능 평가 (Evaluation of Structural Performance of RC Beams retrofitted PVA Fiber to the Change of Replacement Ratio of Recycled Fine Aggregates and Blast Furnace Slag)

  • 하기주;이동렬;하재훈
    • 대한건축학회논문집:구조계
    • /
    • v.34 no.8
    • /
    • pp.3-11
    • /
    • 2018
  • In this study, total nine R/C beams, designed by the PVA Fiber with ground granulated blast furnace slag and recycled fine aggregate were constructed and tested under monotonic loading. In the material development, micromechanics was adopted to properly select the optimized range of the composite based on steady-state cracking theory and experimental studies on the matrix and interracial properties. Experimental programs were carried out to improve and evaluate the structural performance of the test specimens: the load-displacement, the failure mode, the maximum strength, and ductility capacity were assessed. Test results showed that test specimens (BSPR-20, 40) was increased the maximum load carrying capacity by 3~6% and the ductility capacity by 9~14% in comparison with the standard specimen (BSS). And the specimens (BSPR-60, 80, 100) was decreased the maximum load carrying capacity by 0~4% and the ductility capacity by 79% in comparison with the standard specimen (BSS) respectively.

산업부산물과 순환잔골재를 적용한 강섬유 보강 철근콘크리트 보의 구조성능 평가 (Evaluation of Structural Performance of Steel Fiber Reinforced Concrete Beams using Industrial By-products and Recycled Fine Aggregates)

  • 하기주;이동렬;하재훈
    • 대한건축학회논문집:구조계
    • /
    • v.34 no.11
    • /
    • pp.11-18
    • /
    • 2018
  • In this study, seven R/C beams, designed by the steel fiber with ground granulated blast furnace slag and recycled fine aggregate were constructed and tested under monotonic loading. In the material development, micromechanics was adopted to properly select the optimized range of the composite based on steady-state cracking theory and experimental studies on the matrix and interracial properties. Experimental programs were carried out to improve and evaluate the structural performance of the test specimens: the load-displacement, the failure mode, the maximum strength were assessed. Test results showed that test specimens (BSSR-20, 40, 60, 80) were increased the maximum load carrying capacity by 2~9% and the ductility capacity by 10~22% in comparison with the standard specimen (BSS) respectively. And the specimens (BSSR-100) was decreased the maximum load carrying capacity by 5% and the ductility capacity by 44% in comparison with the standard specimen (BSS) respectively.

특고압 가스 절연 부하 개폐기의 통합형 대전력 시험 방법 및 회로 구성에 관한 연구 (A Study on the Construction of Test circuit and Unification of Experiment Method for High Voltage Gas-insulated Load Switch using High Power Testing System)

  • 정흥수;김민영;김준석
    • 조명전기설비학회논문지
    • /
    • v.22 no.12
    • /
    • pp.36-46
    • /
    • 2008
  • 본 논문은 대전력시험설비를 이용한 특고압 가스 절연 부하 개폐기의 대전력 시험회로의 구성과 통합형 시험 방법에 관하여 연구하였다. 대전력시험설비는 전기기기의 전기적 및 기계적인 성능을 검증하는 설비로서 단락발전기, 보호차단기, 투입스위치, 임피던스, 고압변압기, 저압변압기, 측정 및 보호시스템 등으로 구성되며, 이 시스템을 이용하여 단시간전류시험, 전류개폐용량시험, 단락투입 및 차단시험 등을 실시한다. 특고압 가스 절연 부하 개폐기의 규격으로는 국내 배전계통에 적용되는 ES(한국전력공사 표준규격) 5925-0002가 있으며, 국제 규격으로는 IEC 60265-1, 62271-1 및 IEEE C 37.74 등이 있다. 본 논문에서는 여러 규격에 각각 규정되어 있는 시험 절차, 시험회로 구성 및 시험 방법 등을 통합하여 600[MVA]급 대전력 시험설비에 적용하였다.

기기냉각수 폐열회수용 흡수식 히트펌프의 부분부하 성능에 관한 연구 (A Study on Partial Load Performance of Absorption Type Heat Pump for Waste Heat Recovery of Closed Cooling Water)

  • 박병철;김태형;김광수
    • 에너지공학
    • /
    • v.28 no.2
    • /
    • pp.47-54
    • /
    • 2019
  • 복합화력발전소 에너지절감 사업으로 폐열회수용 흡수식 히트펌프가 설치됨에 따라 부분부하(Partial Load)에서의 성능 데이터 확인을 위해 성능시험을 실시하였다. 부분 부하에서 히트펌프 가동에 따른 운전 데이터 변화는 다음과 같다. 기기냉각수(CCW) 배열 및 배열회수열교환기(HRSG)로부터 공급되는 저압증기(LP STM)의 일부가 히트펌프의 열원으로 공급되므로 지역난방열 생산이 증대된다. 그러나 증기터빈으로 공급되는 저압증기의 유량감소에 따라 증기터빈 출력이 감소된다. 또한 고압 지역난방열교환기(HP-DH) 및 저압 지역난방열교환기(LP-DH)로 공급되는 고압터빈(HPT) 배기증기의 유량 저하에 따라 HP-DH 및 LP-DH의 열생산량도 감소한다. 부분부하에서는 정격부하 대비 히트펌프에 운전에 따른 터빈 출력 저하가 큰 것으로 나타났으며, 이에 따라 부분 부하에서는 발전소 전체의 열 생산 증가량, 전기출력 감소량을 종합적으로 고려하여 히트펌프 운전 여부를 결정해야 한다.

잔류하중을 고려한 장대 PHC 말뚝의 양방향 재하시험 결과해석 (Analysis of a Bi-directional Load Test Result on tong PHC Piles in Consideration of Residual Load)

  • 김성렬;정성교;이봉열
    • 한국지반공학회논문집
    • /
    • v.24 no.6
    • /
    • pp.85-93
    • /
    • 2008
  • 대심도 연약지반에 설치되는 말뚝은 말뚝의 길이가 길어져 지반지지력이 크므로 극한 지지력의 확인이 힘들고, 부마찰력에 의해 큰 잔류하중이 발생하기 때문에 하중전이시험을 수행하더라도 정확한 하중전이곡선을 산정하기 어렵다. 본 연구에서는 연약지반에 설치된 PHC 항타 말뚝을 대상으로 선단지지력과 주면마찰력을 분리측정할 수 있고 극한 지지력을 확인하기 용이한 하중전이 양방향 재하시험을 수행하였다. 말뚝설치 직후부터 말뚝변형률을 지속적으로 계측하여 잔류하중을 결정하였다. 잔류하중의 영향을 고려하여 참지지력과 참 하중-변위 곡선을 분석하였다. 이를 바탕으로 잔류하중이 포함된 주면마찰력에 대한 하중-변위 거동모형을 제안하였다. 결과적으로, 점토지반에 설치되는 장대말뚝의 재하실험 결과에 대한 정확한 분석을 위해서는 잔류하중을 고려하여야 한다는 것을 입증하였다.

마이크로컴퓨터를 이용(利用)한 엔진 성능시험(性能試験)의 자동화(自動化)에 관한 연구(硏究)(II) -모의(模擬) 부하시험(負荷試験) 시스템의 구성(構成) 및 평가(評價)- (A Microcomputer-Based Data Acquisition/Control System for Engine Performance Test(II) -Construction and Evaluation of a Load Simulation System-)

  • 류관희;배영환;윤기직
    • Journal of Biosystems Engineering
    • /
    • v.14 no.1
    • /
    • pp.1-7
    • /
    • 1989
  • This study was carried out to develop a system and methodology to simulate the engine load variation occuring during agricultural field operations for a laboratory engine test. The system consisted of an electric dynamometer, an Apple II microcomputer, and a data acquisition and control system. Several pieces of instruments were utilized to measure various engine performance data. Both engine torque and engine speed were fully controlled by a computer program. The dynamic characteristics of the system were analyzed through a series of tests and the limitations on the load simulation test were presented. The results of the study are summarized as follows: 1. Engine speed and toque were controlled by a computer program. The use of a stepping motor and reduction gears enabled engine speed be controlled within 1 rpm. 2. The natural frequency of the dynamometer-engine system was found to be around 5 Hz, at which the load simulation would be impossible because of resonance. 3. For the harmonic inputs with the frequencies above the natural frequency, the signal attenuated too much and therefore the load simulation was impossible. 4. The step response of the system showed an overshoot of 24.5 percent and the settling time for 5 percent criterion was around 3 seconds. 5. When actual field test data are utilized for load simulation, a low-pass filter should be included to attenuate the frequency components around and above the natural frequency.

  • PDF

유리섬유 복합재를 이용한 RC슬래브 교량의 보강성능평가 (Reinforced Performance Evaluation of RC Slab Bridge Using Conclinic Advanced FiberWrep)

  • 박순응;박문호;이택우
    • 한국방재학회 논문집
    • /
    • v.10 no.5
    • /
    • pp.35-40
    • /
    • 2010
  • 본 연구에서는 RC슬래브 교량의 내하력을 향상시키기 위해 유리섬유 복합재(CAF)를 이용한 보강방법을 제시하였다. 보강 성능을 평가하기 위해 설계하중 DB 18로 설계된 실험대상 교량의 슬래브 하면에 단위폭당 50 cm로 CAF 복합재를 보강하여 정 동적재하시험을 수행하였다. 정 동적재하시험 결과 RC슬래브의 최대변위, 변형률, 충격계수는 보강전에 비하여 보강후에 각 14.7%, 5.0% 및 33.7% 감소하였다. 시험경간 중앙부에서의 RC슬래브의 공칭저항비는 27% 증가하였고, 공용내하력은 1,2 경간에서 44.6%, 48.9%증가하였다. 결론적으로 설계하중 DB 18로 설계된 노후된 RC슬래브 교량을 현행 1등급교의 설계하중 DB 24로 향상시키는데 CAF 복합재를 이용한 보강방법은 매우 효과적인 것으로 판단된다.

Load-slip curves of shear connection in composite structures: prediction based on ANNs

  • Guo, Kai;Yang, Guotao
    • Steel and Composite Structures
    • /
    • v.36 no.5
    • /
    • pp.493-506
    • /
    • 2020
  • The load-slip relationship of the shear connection is an important parameter in design and analysis of composite structures. In this paper, a load-slip curve prediction method of the shear connection based on the artificial neural networks (ANNs) is proposed. The factors which are significantly related to the structural and deformation performance of the connection are selected, and the shear stiffness of shear connections and the transverse coordinate slip value of the load-slip curve are taken as the input parameters of the network. Load values corresponding to the slip values are used as the output parameter. A twolayer hidden layer network with 15 nodes and 10 nodes is designed. The test data of two different forms of shear connections, the stud shear connection and the perforated shear connection with flange heads, are collected from the previous literatures, and the data of six specimens are selected as the two prediction data sets, while the data of other specimens are used to train the neural networks. Two trained networks are used to predict the load-slip curves of their corresponding prediction data sets, and the ratio method is used to study the proximity between the prediction loads and the test loads. Results show that the load-slip curves predicted by the networks agree well with the test curves.