• 제목/요약/키워드: Hydraulic Characteristics

검색결과 2,359건 처리시간 0.032초

A foundation treatment optimization approach study in hydraulic engineering

  • Zhang, Tianye;Liu, Shixia
    • Earthquakes and Structures
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    • 제15권2호
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    • pp.215-225
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    • 2018
  • To reach a better foundation treatment project, an optimized analysis of composite foundation was studied in the field of hydraulic engineering. Its unique characteristics in hydraulic engineering were concluded. And, the overall and detailed analysis of the composite foundation model established was carried out. The index parameters of the vertical reinforced rigid pile composite foundation were formulated. Further, considering the unique role of cushion in hydraulic engineering, its penetration and regularity were analyzed. Then, comparative and optimized analyses of cushion multistage physical dimensions and multistage material characteristics were established. The parameters of the piles distance were optimized and the multilevel scientific and reasonable parameters information was obtained. Based on the information of these parameters, the practical application was verified. It effectively supported the effective application of vertical reinforcement rigid pile composite foundation in hydraulic engineering. The service mechanism of composite foundation was fully analyzed.

유압 전력 차단기의 동특성에 관한 연구 (A Study on the Dynamic Behavior Characteristics of the Hydraulic Electric Power Circuit Breaker)

  • 하은경;김수태;정상원;김상곤
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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    • pp.365-366
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    • 2006
  • Hydraulic circuit breaker is the most popular type of electric power circuit breaker because of its superiority of operating performance and capacity. For the improvement of hydraulic circuit breaker's operating performance, it is very important to analyze its dynamic behavior characteristics. In this study, hydraulic circuit is modeled, analyzed and experimented. As a result, the experimental data agree well with the numerical ones, and the numerical results can be applied to the design and the improvement of hydraulic electric power circuit breaker.

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쿠션 형상 변화에 따른 유압 액추에이터 작동 특성 연구 (Motion Characteristics of Hydraulic Actuator with Various Cushion Shapes)

  • 김진형;강현수;한수민;김윤제
    • 한국유체기계학회 논문집
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    • 제18권2호
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    • pp.48-53
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    • 2015
  • Hydraulic actuator is a primary component of the hydraulic valve systems. This paper describes a motion characteristic of hydraulic actuator with various configurations of cushion. It plays an important role in protecting the actuator from the shock when the piston reaches the end position. Numerical analyses were conducted by using commercial code, ANSYS with k-${\varepsilon}$ turbulent model. The results for pressure and velocity distributions in the hydraulic actuator with different cushion shapes were graphically depicted.

유압펌프용 실린더 블록의 윤활 및 동특성 해석 (Analysis of Lubrication and Dynamic Characteristics of a Cylinder Block for Hydraulic Pump)

  • 안성용;임윤철;홍예선
    • Tribology and Lubricants
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    • 제20권4호
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    • pp.209-217
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    • 2004
  • Lubrication characteristics between a cylinder block and a valve plate for high speed bent-axis type hydraulic pump play an important role in volumetric efficiency and durability of pump. In this paper, a finite element method is presented for the computation of the pressure distribution between a cylinder block and a valve plate for high speed bent-axis type hydraulic pump. Also, a Runge-Kutta method is applied to simulate the cylinder block dynamics of three-degrees of freedom motion. From the results of computation, we can draw two major conclusions. One is related to the fluid film characteristics between a cylinder block and a valve plate and the other is related to the average leakage that is determined by the pressure gradient and the clearance near the discharge port. The numerical results of cylinder block dynamics were compared with the experimental results using eddy-current type gap sensors those are fixed at a pump housing.

상태공간 모델과 임펄스 시험에 의한 발전소 배관지지용 유압완충기의 동특성 해석 (On the Analysis of Dynamic Characteristics of Pipe Supporting Hydraulic Snubber in Electric Power Plant with State-space Model and Impulse Testing)

  • 이재천;임문혁;황태영
    • 한국정밀공학회지
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    • 제19권10호
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    • pp.130-138
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    • 2002
  • This paper presents the modeling and analysis of dynamic characteristics of hydraulic snubber in electric power plant. The nonlinear state-space model of 14th order to describe the dynamics of the snubber was established by Simulink. The simulation results show that the hydraulic snubber reacts as like the conventional shock absorbers against the high pulse shock load. The snubber also shows the peculiar characteristics to the small step load, which temporarily lock the control valves up, however maintain same steady-state pressures of all internal chambers in the long run. Two case studies for the analysis of the snubber were addressed. Practical pulse testing method was also proposed to identify the frequency response characteristics of the snubber.

유압(油壓) 관로(管路) 내(內)에서 유체(流體) 유동(流動)의 과도응답특성(過渡應答特性)에 관(關)한 이론적연구(理論的硏究) (A Characteristics of Transient fluid flow in a Hydraulic circular pipe)

  • 김형준;정지철;유영태
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2000년도 춘계학술대회논문집B
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    • pp.829-834
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    • 2000
  • This paper is primarily directed toward analyzing the transient response characteristics in hydraulic pipe lines. The exact solution to the transient response characteristics was obtained by using the complicated transfer function derived by Iberall. The discrepancy with the exact and approximate is small, so the approximate solution is adopted to the theoretical one. An equation was derived which describes the pressure times relationship Hat occurs at the end of volume terminated transmission line following a sudden pressure change at its inputs. As a result, It is found that the density has relationship about the Wave Propagation is very useful in analyzing the transient response characteristics of hydraulic pipe lines. The velocity of Pressure wave Propagation decreases as the density of fluid increased.

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수질모델링을 위한 하천수리특성 추정방법 개선: QualKo 모형을 중심으로 (Improvement in Stream Hydraulic Characteristics Estimation Method for Modeling Water Quality: Focusing on QualKo)

  • 한수희;신현석;김상단
    • 한국습지학회지
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    • 제10권1호
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    • pp.11-20
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    • 2008
  • 본 연구에서는 수질모형의 적용 시 유량계수들의 적절한 추정방안을 살펴보았다. 유량계수들의 추정 시에 수리학적 유사구간의 최하류 단면을 기준으로 산정하는 것(기존의 관습적인 방법) 보다는 수리학적 유사구간 전체 단면을 고려하여 산정하는 것이 하천의 유속분포 또는 이동시간의 측면에서 보다 더 하천 유수의 흐름을 정확하게 표현할 수 있음을 알 수 있었다. 또한 어떤 특정 구간에서의 잘못된 유량계수의 추정은 수질 항목에 따라서는 해당구간 수질예측의 정확도뿐만 아니라 그 하류구간에서의 수질 예측에서도 오차가 계속 누적되는 것으로 나타남에 따라 유량계수의 산정에 보다 더 세심한 주의를 기울여야 할 것으로 판단된다.

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경사 구조물이 침전지내 수리거동 Index에 미치는 영향 (A Study on the Effect of the Inclined Structure on the Hydraulic Behavior Index within Sedimentation basin)

  • 임성호;황준식;박노석;김성수;임경호
    • 상하수도학회지
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    • 제23권5호
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    • pp.517-526
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    • 2009
  • This research has been conducted to investigate the characteristics of hydraulic behavior within the PAC contactor, the rectangular shape sedimentation basin without inclined tube and the other one with inclined tube those are parts of demonstration plants(capacity : $2,000m^3/d$) in Korea Institute of Water and Environment. As results of tracer tests, the flow within PAC contactor was evaluated to divided into plug flow and dead space distinctly, and characteristics of dead space was close to that of CSTR(Complete/continuous Stirred Tank Reactor). Also, considering Reynolds number, Froude number, Morill, Modal, NCSTR Inex and plug flow/mixed flow fraction, in the case of the rectangular shape sedimentation basin without inclined tube, the characteristics of flow pattern was close to CSTR. On the other hand, in the case of the basin with inclined tube, the region of CSTR decreased precisely compared with the case of no-tube. Until now we have recognized that the inclined hydraulic structure just reduces the surface loading rate within a sedimentation basin. Actually besides, the inclined structure have an important effect on the hydraulic behavior within the basin.

Matlab을 이용한 유압모터-부하계의 위치제어 (Position Control of Hydraulic Motor-Load System using Matlab)

  • 이명호;박형배
    • 한국공작기계학회논문집
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    • 제13권3호
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    • pp.76-83
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    • 2004
  • The purpose of this paper is to find an effective control system for a hydraulic motor-load system using matlab. The Hydraulic control system consists of a hydraulic pump, a hydraulic proportional control valve, hydraulic pipelines, a hydraulic motor and a load system. The simulation models were verified by comparing the simulation results with measured data from the real hydraulic proportional position control system. In order to compensate the nonlinear friction characteristics in a hydraulic motor-load system, a discrete time PD controller and Friction torque observer has been applied.

헬름홀츠 감쇠기를 응용한 유압시스템의 유압맥동 및 소음 최소화 연구 (Hydraulic Pulsation and Noise Reduction using the Helmholtz Attenuator)

  • 김동현;이대옥;최근국
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 춘계학술대회 논문집
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    • pp.614-619
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    • 1997
  • The hydraulic pressure pulsation has on the effected on the acoustic nosie and control performance of the hydraulic-servo system. The Helmholtz attenuator introduction on the hydraulic line is an efficient device to reduce the hydraulic pulsation. The salient feature of causing hydraulic pulsation and the frequency characteristics of Helmholtz attenuator are studied. The hydraulic filter design parameters such as the locating position, connecting orifice area and accumulator volume are mathematically analyzed. The instrumental works are carried out with the remarkable reduction of the hydraulic pressure pulsation magnitude and the acoustic noise level.

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