• Title/Summary/Keyword: 유압 구동장치

Search Result 89, Processing Time 0.02 seconds

브러시리스 직류모터 방식 EMDP의 구동을 위한 제어시스템 설계

  • Lee, Hee-Joong;Park, Moon-Su;Min, Byeong-Joo;Choi, Hyung-Don
    • Aerospace Engineering and Technology
    • /
    • v.4 no.1
    • /
    • pp.162-170
    • /
    • 2005
  • In KSLV-I, actuation system for thrust vector control of kick motor was configured as electro-hydraulic servo actuation system and consisted of actuators, hydraulic power supply system, hydraulic power distribution system and control system. In case of hydraulic power supply system, we use EMDP(Electric Motor Driven Pump) to supply hydraulic power. Generally, we use brushed DC motor for EMDP but it is not easy to operate EMDP using brushed DC motor at a high altitude. Hence, we are developing EMDP using brushless DC motor to use at a high altitude. In this study, we will explain control system for BLDC motor to drive hydraulic pump.

  • PDF

유도무기체계 구동장치 기술현황(1)

  • Mun, Ui-Jun
    • Defense and Technology
    • /
    • no.10 s.152
    • /
    • pp.64-69
    • /
    • 1991
  • 유도무기체계를 위한 구동장치는 크게 유도탄 조종용 구동장치와 유도무기 발사대 터렛 구동장치로 나눌수 있다. 유도탄 구동장치는 1회용이지만 높은 출력/무게비가 요구되고, 발사대 구동장치는 대부하라는 점에서 기술적 특성이 구별된다. 유도무기 구동장치로는 유압, 공압, 전기모타 구동장치가 쓰일수 있으나 종래에는 작은 동력이 요구되는 전술용 유도무기의 구동장치를 제외하고는 많은 경우에 출력대 무게 비가 높은 유압구동장치가 사용되어왔다

  • PDF

Modeling and Simulation of A Small Hydraulic Actuation System for the Tactical Missile (전술유도무기용 소형 유압식 구동장치의 모델링 및 시뮬레이션)

  • Lee, Doyun;Lee, Hosung;An, Sungyong;Park, Yeonjung
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.45 no.4
    • /
    • pp.349-357
    • /
    • 2017
  • If an actuation system of the tactical missile is required very fast response time on conditions of short operating time and big loads on the actuator, we would prefer to adopt a small hydraulic system. In this paper, a mathematical model is proposed to analyze and simulate the small hydraulic actuation system. The mathematical model consists of a high pressure vessel model, a pressure regulator model, a hydraulic reservoir model and a actuator model. The suggested model is validated by comparison of simulation results with experimental data. The simulation results show that the mathematical model could be useful for designing a hydraulic actuation system.

Basic configurations and working principles of automotive electrohydraulic control valves (자동차용 유압제어밸브의 기본구성 및 작동방식)

  • 홍예선
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.13 no.6
    • /
    • pp.30-38
    • /
    • 1991
  • 자동차의 제동장치, 조향장치, 자동 변속장치 등에 요구되는 큰 힘을 얻기 위하여 유압식 구동장치가 중량당 출력비가 높고 응답특성이 좋으며 과부하에 대한 방지기능이 간단하게 이루어 진다는 장점이 있기 때문이다. 본 고에서는 우리나라에서도 전자제어식 제동장치, 조향장치, 자동변속장치, 현가장치 등의 개발을 시도하고 있는 현 시점에서 기술축적이 가장 취약한 분야라고 볼 수 있는 자동차용 전기유압밸브의 기본적인 메카니즘에 대하여 종합적으로 소개하고자 한다.

  • PDF

Analysis on the Dynamic Characteristics of a DDV Actuation System of a FBW Aircraft (FBW 항공기의 DDV 구동장치에 대한 운동특성 해석)

  • Nam, Yun-Su;Park, Hae-Gyun
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.34 no.3
    • /
    • pp.74-80
    • /
    • 2006
  • This paper deals with the control and fault monitoring of a DDV hydraulic actuation system. A hydraulic servo system has a nonlinear dynamics of an orifice flow through a valve spool. A full nonlinear model for a DDV actuation system is driven, and linearized to a simple model which is convenient for a control loop and fault monitor design. A top level requirement on the performance and safety for the actuation system is introduced. A control system and fault monitoring structure which can meet these requirements are discussed. A simulation package for a DDV actuation system which has a triplex redundant structure is developed.

Research of Synthetic Resonance Characteristics for Electrohydraulic Thrust Vector Control Actuation System (전기-유압식 추력벡터제어 구동장치시스템의 합성공진 특성 연구)

  • Min, Byeong-Joo;Choi, Hyung-Don;Kang, E-Sok
    • Aerospace Engineering and Technology
    • /
    • v.7 no.1
    • /
    • pp.151-160
    • /
    • 2008
  • In this paper, the analysis results of synthetic resonance characteristics are described for the electrohydraulic thrust vector control actuation system. The synthetic resonance is induced by integration of position servo actuation system on the flexible launch vehicle mounting structure. The new resonance mode is synthesized due to composition of hydraulic resonance for electrohydraulic position servo system with inertia load condition and structural resonance for flexible mounting structure. This synthetic resonance can make stability of control system worse by feedback and amplification of control system. The exact nonlinear analysis model of this phenomenon is developed to predict and design a control algorithm for improvement characteristics. The DPF (Dynamic Pressure Feedback) control algorithm has been designed and has excellent resonance suppression capability.

  • PDF

Development of Electrohydraulic Actuation System for High Altitude Launch Vehicle (고고도 발사체용 전기유압식 구동장치시스템 개발)

  • Min, Byeong-Ju;Choe, Hyeong-Don;Gang, Lee-Seok
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.34 no.12
    • /
    • pp.82-89
    • /
    • 2006
  • This paper describes the development results of electrohydraulic actuation system which performs the attitude and trajectory control of pitch and yaw motion using thrust vector control for high altitude launching vehicle operated in high vacuum environment (altitude higher than 300 km). As compared with electrohydraulic actuation system for low altitude launch vehicle which operated under altitude of stratosphere, the intensified development requirements, newly adopted design and manufacturing technologies, newly developed test equipments and test results are summarized in this paper. The development test and evaluation of actuation system were successfully accomplished. The developed actuation system will be installed on KSLV-I after finishing verification of interface and integration compatibility with related other systems.

KSR- III 추력벡터제어를 위한 유압-서보 김발엔진 구동시스템에 관한 연구

  • Lee, Hee-Joong
    • Aerospace Engineering and Technology
    • /
    • v.1 no.1
    • /
    • pp.141-146
    • /
    • 2002
  • During dynamic flight by propulsion of rocket engine, in the atmosphere, the attitude control of flight vehicle can be accomplished by the aerodynamic fin actuator. But, in the outer space, the method of TVC(Thrust Vector Control) is only depend on for it. There are many systems which were developed for TVC. In our research, among them we adopted gimbal engine actuation system which could control the vector of thrust by swivelling rocket engine connected by gimbal. There are electro-hydraulic, electro-mechanical and pneumatic system which can be used as gimbal engine actuation system, but the electro-hydraulic system that has high ratio of output power to mass is preferred for the high power system. In this note, we made a mathematical model of the electro-hydraulic gimbal engine actuation system for the TVC of KSR-III in detail and on the base of this model we performed a simulation study. And then, we verified the model by making a comparison between the simulation and the experiments on the real system.

  • PDF

Characteristic Research of Electromechanical Actuation System for Launch Vehicle Thrust Vector Control (발사체 추력벡터제어용 전기-기계식 구동장치시스템 특성 연구)

  • Min, Byeong-Joo;Choi, Hyung-Don;Kang, E-Sok
    • Aerospace Engineering and Technology
    • /
    • v.6 no.2
    • /
    • pp.164-170
    • /
    • 2007
  • In this paper, the development results of electromechanical TVC actuation system is described in the aspect of design, analysis, manufacturing and test. The kinds of prime power for TVC actuation system is classified by the variety of propulsion system of launch vehicle. The electric power by battery is the sole candidate for prime power of TVC actuation system at the view point of feasible domestic infra technologies for the present. The characteristic analysis study is performed between electromechanical and electrohydraulic actuation system with respect to power efficiency, performance and weight efficiency. The electromechanical actuation system has superiority of power and weight efficiency according to less opportunity of power conversion process.

  • PDF

Operation and Result Analysis of Hydraulic Vehicle Holding Device (발사체 지상고정장치 유압시스템 작동 시험 및 결과 분석)

  • Kim, Dae Rae;Yang, Seong Pil;Lee, Jae Jun;Song, Oh-Seob;Lee, Young-Shin
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.22 no.1
    • /
    • pp.80-88
    • /
    • 2018
  • The function of a vehicle holding device (VHD) is to securely hold a launch vehicle on the launch pad and release the launch vehicle at maximum thrust after engine ignition to allow lift-off of the launch vehicle. During the release of the launch vehicle, to prevent the Ka doing a doing a doing mode, which is the vertical oscillation of the entire liquid propellant, the release of the launch vehicle should be gradual. In this study, for the gradual release of a launch vehicle, a hydraulic system comprising an accumulator and pyro valve to operate a hydraulic cylinder and control the speed of the cylinder with an orifice is introduced. Through a test, the influence of design variables on the cylinder speed is analyzed. Based on this, the design values of the hydraulic cylinder are determined. Through this study, the engineering basis for developing a VHD releasing a launch vehicle at maximum thrust is provided.