• Title/Summary/Keyword: Hydraulic Evaluation

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Structural Evaluation of Prototype Bridge using Concrete Weight Blocks (콘크리트 블록을 이용한 실교량의 구조성능평가기법)

  • 심종성;오홍섭;유재명
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.429-432
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    • 2000
  • Test methods by hydraulic oil or vehicular live load have been used for structural evaluation of prototype bridge. However it has been reported that the use of hydraulic jack has some disadvantages for the view of safety and economy, and the complete structural evaluation through each loading state can not be accomplished blocks is presented to overcome those demerits. To verify the application and safely of the use of concrete weight blocks during each loading state, it is applied to prototype deteriorated bridge. As a result, it could be evaluated the structural behavior completely using the concrete weight blocks

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Risk Evaluation and Uncertainty Analysis in Hydraulic Design system (수공구조물 설계 시스템의 위험도 평가와 불확실성 해석)

  • Chang, Suk-Hwan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.2 no.4
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    • pp.194-200
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    • 1998
  • Risk, probability of failure, which includes various uncertainties and influential factors of performance should be accounted for in engineering system. Recently, several different methods to analysis risk evaluation evolved and one of the practical method is FOSM (First Order Second Moment Method ). FOSM method is derived in terms of terms coefficient of variance to uncertainties which influence various factor. For risk evaluation and uncertainty analysis in hydraulic design system, load-capacity relationship is adopted in this paper. Sample catchment with design of sewer system is applied, which plots safety factor vs. risk. Risk evaluation and uncertainty analysis are very to important develop optimal design model in hydraulic system

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CORE AND SUB-CHANNEL EVALUATION OF A THERMAL SCWR

  • Liu, Xiao-Jing;Cheng, Xu
    • Nuclear Engineering and Technology
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    • v.41 no.5
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    • pp.677-690
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    • 2009
  • A previous study demonstrated that the two-row fuel assembly has much more favorable neutron-physical and thermal-hydraulic behavior than the conventional one-row fuel assemblies. Based on the newly developed two-row fuel assembly, an SCWR core is proposed and analyzed. The performance of the proposed core is investigated with 3-D coupled neutron-physical and thermal-hydraulic calculations. During the coupling procedure, the thermal-hydraulic behavior is analyzed using a sub-channel analysis code and the neutron-physical performance is computed with a 3-D diffusion code. This paper presents the main results achieved thus far related to the distribution of some neutronic and thermal-hydraulic parameters. It shows that with adjustment of the coolant and moderator mass flow in different assemblies, promising neutron-physical and thermal-hydraulic behavior of the SCWR core is achieved. A sensitivity study of the heat transfer correlation is also performed. Since the pin power in fuel assemblies can be non-uniform, a sub-channel analysis is necessary in order to investigate the detailed distribution of thermal-hydraulic parameters in the hottest fuel assembly. The sub-channel analysis is performed based on the bundle averaged parameters obtained with the core analysis. With the sub-channel analysis approach, more precise evaluation of the hot channel factor and maximum cladding surface temperature can be achieved. The difference in the results obtained with both the sub-channel analysis and the fuel assembly homogenized method confirms the importance of the sub-channel analysis.

A Study on the Hydraulic Simulation of Automatic Excavation System (자동굴삭시스템을 위한 굴삭기 유압부 시뮬레이션에 관한 연구)

  • Kwon, Soon-Kwang;Lee, Hong-Seon;Lee, Chang-Don;Yang, Soon-Young
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.11
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    • pp.984-989
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    • 2008
  • Hydraulic excavators have been one of the most popular devices in the various industries for construction, forestry and agriculture etc. Because the excavators generally work in poor environment, the various organizations study to automate those. In this paper, a hydraulic simulation for evaluation of automatical excavation system is presented. It is using the AMESim based on the 1.5 ton excavator with fixed displacement pumps, and operated by signals those control pilot pressure to spools of the main control valve. The main control valve is regarded that only consists of boom, arm and bucket. This simulation program is expected to apply to evaluation of the controller for automatic excavation system and to estimate of effect in accordance with change of some components or parameter.

Design of Hydraulic cylinder for Kinetic Performance Test of Tilting Mechanism (틸팅 메커니즘 기구학적 성능평가를 위한 유압 실린더 설계)

  • Kim, Ho-Yeon;Nam, Jin-Wook;Lee, Joon-Hwan;Kim, Bong-Tak
    • Proceedings of the KSR Conference
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    • 2011.05a
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    • pp.1124-1127
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    • 2011
  • In this paper, kinematic performance of the tilting mechanism, hydraulic cylinder was designed for the evaluation. ESW GmbH is attached to the existing electric tilting actuator's performance based on the similar system, each operated by tilting the balance in order to effectively balance has been designed by an independent hydraulic system. In addition, the behavior of the hydraulic system for storing and analyzing information about UI (User Interface) was also included in the design.

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Hazard Evaluation of Levee by Two-Dimensional Hydraulic Analysis (2차원 수리해석에 의한 하천 제방 위험도 평가분석)

  • Park, Jun Hyung;Kim, Tae Hyung;Han, Kun Yeun
    • Journal of Wetlands Research
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    • v.18 no.1
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    • pp.45-57
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    • 2016
  • Levee safety is being evaluated using one of the several failure causes including overtopping, infiltration and erosion or 1D hydraulic analysis considering physical characteristics of levee in practical engineering works. However, mentioned evaluation methods are not able to consider various failure causes of levee at the same time and to get reliable results where requires the accurate topographic information. This study proposed the flood hazard index which is able to consider several hazard factors involving overtopping, infiltration and erosion risk simultaneously. The index was generated from results of 2D hydraulic analysis reflecting accurate topographic information. The study areas are the confluences of the Nakdong River and two streams(Gamcheon and Hoecheon). Levee safety was evaluated using results based on 2D hydraulic analysis considering riverbed changes of before and after dredging work in the study area. This study will contribute to estimate the reliable safety evaluation of levee where may have hazards during extreme flood events.

A Durability Evaluation of Remanufactured Industrial Hydraulic Pump and Solenoid Valve (산업용 유압펌프 및 솔레노이드 밸브 재제조품의 내구성 평가)

  • Lee, Kyu-Chang;Park, Sang-Jin;Son, Woo-Hyun;Jeon, Chang-Su;Mok, Hak-Soo
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.5
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    • pp.537-546
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    • 2021
  • Remanufacturing is one of the most important resource recycling technology in response to resource depletion and environmental pollution. Domestic remanufacturing industry don't invigorate compared to other advanced countries because of low price and reliability of remanufactured product. In this study, remanufactured hydraulic pump and solenoid valve were evaluated durability by accelerated life test. In order that standard remanufacturing process was developed by core analysis and failure mode and effect analysis. And cores were remanufactured by standard remanufacturing process. For accelerated life test, the evaluation item and criteria were deduced by results of FMEA, reliability standards and enterprise interior criteria. To evaluate durability of remanufactured product, the remanufactured hydraulic pump and solenoid valve were evaluated performance after accelerated life test and the results were satisfied with criteria. This study showed that remanufactured products have a similar level of durability to new products by definition of remanufacturing.