• 제목/요약/키워드: Hydraulic loading system

검색결과 143건 처리시간 0.028초

충전탑에서 수력학적 거동의 수학적 해석 연구 (A Study on the Mathematical Interpretation o Hydraulic Behaviour in Packing Tower)

  • 김석택
    • 한국대기환경학회지
    • /
    • 제17권1호
    • /
    • pp.51-56
    • /
    • 2001
  • This study was carried out to interpret mathematically hydraulic behaviour in packing tower which packed 50 mm plastic Hiflow-ring with a dimension of 300 mm wide and 1,400 mm high. In view of energy saving, the recent packing. 50 mm plastic Higlow-ring was superior to conventional packings because of low pressure drop in high loads. As relative error between numerically predicted and experimentally obtained values was less then 6% in the loading and flooding point, it found that therir results appeared to be adequate. Comparison of hose two values in both dry and wet packing conditions. relative errors amount to 3.96 and 5.6%, respectively. In order to evaluate the operating characteristics of packing, the type, size, and material for packings must be estimated in various system and loads. This study is able to calculated pressure drop, hold-up, gas and liquid loads using mathematical interpretation. For these calculation, the specific constants of each packings must be calculated first all. The method of mathematical interpretation in this study turned out to be superior to the existing methods because of reduced errors at loading and flooding point.

  • PDF

자화-생물처리 시스템에 의한 염색폐수의 처리 (Treatment of Dyeing Wastewater by Magnetic-Biological Treatment System)

  • 이선하
    • 한국환경과학회지
    • /
    • 제19권3호
    • /
    • pp.371-377
    • /
    • 2010
  • The purpose of this study is to investigate treatment efficiency in dyeing wastewater treatment by the high rate aeration system(HRA) and a combination of the HRA with magnetized wastewater treatment system(MWS). At the hydraulic retention time of 16hr, 24hr, 30hr, BOD removal efficiencies of HRA system were 93%, 96% and 98%, combination of the HRA with MWS system were 94%, 96.8% and 98.2%, respectively. In ease of COD, at the hydraulic retention time of 16hr, 24hr, 30hr, COD removal efficiencies of HRA system were 66%, 77.1% and 83.1%, combination of the HRA with MWS system were 70.2%, 80.1% and 86.6%, respectively. The comparison of the HRA and combination of the HRA with MWS, effluent BOD of the former was 22.7mg/${\ell}$ and the latter was 19.4mg/${\ell}$, theretore biological treatment efficiency identified to increase by the MWS.

파일의 시공오차를 고려한 스태빙시스템의 구조안전성 평가 (Structural Safety Evaluation of Stabbing System for Pre-Piling Jacket Substructure Considering Pile Construction Errors)

  • 오영철;류재용;이대용
    • 풍력에너지저널
    • /
    • 제14권3호
    • /
    • pp.109-119
    • /
    • 2023
  • A structural safety evaluation was conducted for the stabbing system for the pre-piling jacket substructure currently being developed in South Korea, considering pile construction errors due to its lateral movement that may occur during construction in the ocean. Based on (1) the maximum stress generated by the stabbing system, (2) the maximum rotational displacement of the guide cone, and (3) the maximum stress generated by the horizontal hydraulic pressure cylinder, the structural safety of the stabbing system was examined under the initial loading condition and three possible load combinations during its construction. In order to evaluate the structural safety of the stabbing system, a concept of stress safety factor (= Yield stress / Max. Von-Mises stress) was used. It was found that the stabbing system considered in this study has a sufficient margin of safety.

원자로 냉각재 계통을 지지하는 대구경 유압식 스너버의 이동거리 해석 (Stroke Analysis of Large Bore Hydraulic Snubber Supporting Reactor Coolant System)

  • 이상호;윤기석;전장환;박명규;엄세윤
    • 한국전산구조공학회:학술대회논문집
    • /
    • 한국전산구조공학회 1995년도 가을 학술발표회 논문집
    • /
    • pp.61-67
    • /
    • 1995
  • The steam generator, one of the major components in the reactor coolant system, plays an important role in transferring the thermal energy made in the reactor during normal operation to the secondary side and producing steam to drive turbine. A hydraulic snubber system is used in order to protect the steam generator under the dynamic loading condition and to absorb the thermal expansion transmitted by the reactor coolant piping due to high temperature and pressure during normal operation. In this study, the model for a geometrical linkage system is presented to analyze the snubber stroke of the steam generator and the parameters in the snubber stroke analysis are investigated. A method to analyze lever ratio of the linkage system which is required in the process of determining the snubber stiffness value is also presented. To discuss the validation of the suggested analysis, the analysis results are compared with the measured data during the hot functional test for the standardized 1000 Mwe pressurized water reactor plant under the construction.

  • PDF

Dynamic bending behaviours of RC beams under monotonic loading with variable rates

  • Xiao, Shiyun;Li, Jianbo;Mo, Yi-Lung
    • Computers and Concrete
    • /
    • 제20권3호
    • /
    • pp.339-350
    • /
    • 2017
  • Dynamic behaviours of reinforced concrete (RC) bending beams subjected to monotonic loading with different loading rates were studied. A dynamic experiment was carried out with the electro-hydraulic servo system manufactured by MTS (Mechanical Testing and Simulation) Systems Corporation to study the effect of loading rates on the mechanical behaviours of RC beams. The monotonic displacement control loading, with loading rates of 0.1 mm/s, 0.5 mm/s, 1 mm/s, 5 mm/s and 10 mm/s, was imposed. According to the test results, the effects of loading rates on the failure model and load-displacement curve of RC beams were investigated. The influences of loading rates on the cracking, ultimate, yield and failure strengths and displacements, ductility and dissipated energy capability of RC beams were studied. Then, the three-dimensional finite element models of RC beams, with the rate-dependent DP (Drucker-Prager) model of concrete and three rate-dependent model of steel reinforcement, were described and verified using the experimental results. Finally, the dynamic mechanical behaviours and deformation behaviours of the numerical results were compared with those of the experimental results.

Study on rock fracture behavior under hydromechanical loading by 3-D digital reconstruction

  • Kou, Miaomiao;Liu, Xinrong;Wang, Yunteng
    • Structural Engineering and Mechanics
    • /
    • 제74권2호
    • /
    • pp.283-296
    • /
    • 2020
  • The coupled hydro-mechanical loading conditions commonly occur in the geothermal and petroleum engineering projects, which is significantly important influence on the stability of rock masses. In this article, the influence of flaw inclination angle of fracture behaviors in rock-like materials subjected to both mechanical loads and internal hydraulic pressures is experimentally studied using the 3-D X-ray computed tomography combined with 3-D reconstruction techniques. Triaxial compression experiments under confining pressure of 8.0 MPa are first conducted for intact rock-like specimens using a rock mechanics testing system. Four pre-flawed rock-like specimens containing a single open flaw with different inclination angle under the coupled hydro-mechanical loading conditions are carried out. Then, the broken pre-flawed rock-like specimens are analyzed using a 3-D X-ray computed tomography (CT) scanning system. Subsequently, the internal damage behaviors of failed pre-flawed rock-like specimens are evaluated by the 3-D reconstruction techniques, according to the horizontal and vertical cross-sectional CT images. The present experimental does not only focus on the mechanical responses, but also pays attentions to the internal fracture characteristics of rock-like materials under the coupled hydro-mechanical loading conditions. The conclusion remarks are significant for predicting the rock instability in geothermal and unconventional petroleum engineering.

An Optimal Design of Paddy Irrigation Water Distribution System

  • Ahn, Tae-Jin;Park, Jung-Eung
    • Korean Journal of Hydrosciences
    • /
    • 제6권
    • /
    • pp.107-118
    • /
    • 1995
  • The water distribution system problem consists of finding a minimum cost system design subject to hydraulic and operation constraints. The design of new branchin network in a paddy irrigation system is presented here. The program based on the linear programming formulation is aimed at finding the optimal economical combination of two main factors : the capital cost of pipe network and the energy cost. Two loading conditions and booster pumps for design of pipe network are considered to obtain the least cost design.

  • PDF

THE PERFOMANCE OF GROUNDBASE MOBILE PLATFORM FOR C-BAND MICROWAVE SCATTEROMETER SYSTEM

  • Aziz H.;Mahmood N.N.;Ali A.;Jamil H.;Mahmood K.A.;Ahmad Z.;Ibrahim N.;Brevern P.V.;Chuah H.T.;Koo V.C.;Sing L.X.
    • 대한원격탐사학회:학술대회논문집
    • /
    • 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
    • /
    • pp.61-63
    • /
    • 2004
  • The procurement of a mobile microwave scatterometer platform involved the consideration to ensure a mobile platform and equipment selected full-filled technical requirement and safety standard in Malaysia. Designing, and modification works involved engineering methodology in determining and selecting a suitable hydraulic telescopic boom that suit a selected mobile platform available locally. The mobile platform is a delivery system for microwave remote sensing microwave scatterometer and other accessories to any locations in Malaysia. Total loading to be carried by the mobile platform is 4500 kg and its overall weight must be 16,000 kg as recommended by hydraulic telescopic boom manufacturers. The telescopic boom will elevate microwave scatterometer system including the antenna to a maximum height of 27 m, and can also be rotated through $3600^{\circ}$. A mechanism is incorporated in the system to enable tracking or monitoring angular movement of the hydraulic telescopic boom when positioned towards predetermined target.

  • PDF

THE MECHANICAL DESIGN AND CONSTRUCTION OF A TRUCK MOUNTED SCATTEROMETER SYSTEM

  • Aziz, H.;Mahmood, N.N.;Ali, A.;Ibrahim, N.;Ahmad, Z.;Mahmood, K.A.;Jamil, H.;Brevern, P.V.;Koo, V.C.;Sing, L.K.
    • 대한원격탐사학회:학술대회논문집
    • /
    • 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
    • /
    • pp.1009-1011
    • /
    • 2003
  • The procurement of mobile microwave scatterometer involve the consideration to ensure vehicle and equipment selection full-filled technical requirement and safety standard in Malaysia. Designing, and modification works involve engineering methodology in determining and selecting a suitable hydraulic telescopic boom that suit a selected vehicle available from the market. The vehicle is also a delivery system for microwave remote sensing equipment and other accessories to any locations in Malaysia. Total loading to be carried by the vehicle is about 4500 kg and its overall weight must be 16,000 kg as recommended by hydraulic telescopic boom manufacturers. The telescopic boom will elevate microwave scatterometer system and antenna to a maximum height of 27 m, and can also be rotated through 360$^{\circ}$. A mechanism is incorporated in the system to enable tracking or monitoring angular movement of the hydraulic telescopic boom when positioned towards required target.

  • PDF

유압 위치제어 시스템의 단속적 제어방법에 관한 연구 I

  • 장효환;안병홍;이춘호
    • 대한기계학회논문집
    • /
    • 제11권3호
    • /
    • pp.465-472
    • /
    • 1987
  • 본 연구에서는 솔레노이드 밸브를 사용한 유압위치제어 시스템에 위에서 언급 한 두가지 단속적 제어 방법을 적용하여 각각의 제어변수들과 부하조건이 시스템의 시 간 영역에서의 응답특성에 미치는 영향을 실험적으로 규명하고 각각의 제어특성을 비 교 고찰하였다.