• Title, Summary, Keyword: Hydraulic System

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

  • 이명호;박형배
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.3
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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.

Determination of No-Failure Test Times for the Life Test of Hydraulic System Components (유압시스템 구성품의 수명시험을 위한 무고장 시험시간의 산출)

  • Lee, S.R.;Kim, H.E.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.3 no.3
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    • pp.8-13
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    • 2006
  • It is very important for the manufacturers to predict the life of hydraulic system components according to the results of life tests. Since it takes too much time to test the hydraulic system components until failure, the no-failure test method is applied for the life test of them. If the shape parameter of Weibull distribution, the number of samples, the confidence level, and the assurance life are given, the no-failure test times of hydraulic system components can be calculated by given equation. Here, the procedures to obtain the no-failure test times of the hydraulic system components such as hydraulic motors and pumps, hydraulic cylinders, hydraulic valves, hydraulic accumulators, hydraulic hoses, and hydraulic filters are described briefly.

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Hydraulic System Design and Vehicle Dynamic Modeling for the Development of a Tire Roller

  • Kim, Sang-Gyum;Kim, Jung-Ha;Lee, Woon-Sung
    • International Journal of Control, Automation, and Systems
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    • v.1 no.4
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    • pp.484-494
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    • 2003
  • In this paper, we describe a hydraulic system design and vehicle dynamic modeling for development of tire roller traction, an essential aspect in the system analysis of tire rollers. Generally, tire rollers are one of the most useful types of machines employed in road construction, technically applied to many construction fields. We also conceptualize a new hydraulic and driving system as well as define the motion equations for dynamic and hydraulic analysis. First, we design the hydraulic circuit of the steering control and driving machine system, which can be employed to advance the performance of the lateral control, creating a prototype of construction equipment. Second, we formulate the hydraulic steering system model and hydraulic driving system model through tire roller system development technology. Finally, we validate the acquired performance results in actual tire roller equipment using the data acquisition system. These results may perhaps facilitate the establishment of priorities and design strategies for incremental introduction of tire roller technology into the vehicle and construction field.

Development of the Hydraulic Pressure Transducer System for Testing the Impact Energy of Hydraulic Breaker (유압 브레이커의 타격 에너지 측정을 위한 유압 변환장치 개발)

  • 이근호;이용범;정동수
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.4
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    • pp.154-160
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    • 2004
  • Hydraulic breaker of excavator has been used for the destruction and disassembling of buildings, crashing road pavement, breaking rocks at quaky and etc. The performance of breakers is evaluated their own destructive force and the number of impact by input hydraulic flow rate and pressure on the operating conditions. Because hydraulic breakers generate high impact energy, the accurate measurement of the impact force has been facing a technical challenge. In this study, the hydraulic pressure transducer system was developed based on the characteristics of pressure variation in closed vessel fur testing the impact energy. The hydraulic pressure transducer system is consisted with a hydraulic cylinder, main base, pressure & temperature sensors, LVDT, data acquisition system and etc. The developed hydraulic pressure transducer system was applied to measure the impact energy for hydraulic breaker. The measured impact force was 438.8 kgf.m within the designed impact force bounds. The developed hydraulic pressure transducer system as a simple tester could be applied to measure the impact force and the number of impact.

A Study on the Application and Design of Hydraulic Active Suspension System (유압식 능동 현가시스템의 설계 및 적용에 관한 연구)

  • Jang, Seong-Uk;Lee, Jin-Geol
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.4
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    • pp.683-692
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    • 2002
  • The most important parameter for hydraulic active suspension system is to sustain desirable vehicle maneuvering stability and ride comfort without increasing power consumption. The performance of hydraulic active suspension system depends on damping force of body damping valve and piston damping valve. Hydraulic actuator design and damping valve parameter selection are essential and basic procedure to design hydraulic system. This paper is on computer simulation with use of mathematical model that was delivered from dynamic characteristic of hydraulic actuator, as know basic damping characteristics of hydraulic active suspension system. The aim of this paper is to select the system parameter that affect mainly hydraulic active suspension, and identify the validity on the system parameter selection.

A study on development of hydraulic active suspension system (유압식 능동 현가시스템의 개발에 관한 연구)

  • 장성욱;박성환;이진걸
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1459-1464
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    • 1996
  • The most important parameter for hydraulic active suspension system is to sustain desirable vehicle maneuvering stability and ride comfort without increasing consumption power. The performance of hydraulic active suspension system depends on damping force of body damping valve and piston damping valve. Hydraulic actuator design and damping valve parameter selection are essential and basic procedure to design hydraulic active suspension system. This paper is on computer simulation with use of mathematical model that was delivered from dynamic characteristic of hydraulic actuator, as know basic damping characteristics of hydraulic active suspension system. The aim of this paper is to select the system parameter that affect mainly hydraulic active suspension, and identify the validity on the system parameter selection.

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Active Force Control of Electro-Hydraulic Hybrid Load Simulator using Quantitative Feedback Theory (QFT를 이용한 전기유압 하이브리드 부하 시뮬레이터의 능동 힘제어)

  • Yoon, Joo-Hyeon;Ahn, Kyoung-Kwan;Truong, Dinh Quang;Jo, Woo-Geun
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.2
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    • pp.45-53
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    • 2009
  • Today, reduction of $CO_2$ exhaustion gas for global-warming prevention becomes important issues in all industrial fields. Hydraulic systems have been widely used in industrial applications due to high power density and so on. However hydraulic pump is always being operated by engine or electric motor in the conventional hydraulic system. Therefore most of the conventional hydraulic system is not efficient system. Recently, an electro-hydraulic hybrid system, which combines electric and hydraulic technology in a compact unit, can be adapted to a wide variety of force, speed and torque requirements. In the electro-hydraulic hybrid system, hydraulic pump is operated by electric motor only when hydraulic power is needed. Therefore the electro-hydraulic system can reduce the energy consumption drastically when compared to the conventional hydraulic systems. This paper presents a new kind of hydraulic load simulator which is composed of electro-hydraulic hybrid system. Disturbances in the real working condition make the control performance decrease or go bad. QFT controller is designed to eliminate or reduce the disturbance and improve the control performance of the electro-hydraulic load simulator. Experimental results show that the proposed controller is verified to apply for electro-hydraulic hybrid system with varied external disturbances.

Hydraulic Control System Using a Feedback Linearization Controller and Disturbance Observer - Sensitivity of System Parameters -

  • Kim, Tae-hyung;Lee, Ill-yeong;Jang, Ji-seong
    • Journal of Drive and Control
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    • v.16 no.2
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    • pp.59-65
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    • 2019
  • Hydraulic systems have severe nonlinearity inherently compared to other systems like electric control systems. Hence, precise modeling and analysis of the hydraulic control systems are not easy. In this study, the control performance of a hydraulic control system with a feedback linearization compensator and a disturbance observer was analyzed through experiments and numerical simulations. This study mainly focuses on the quantitative investigation of sensitivity on system uncertainties in the hydraulic control system. First, the sensitivity on the system uncertainty of the hydraulic control system with a Feedback Linearization - State Feedback Controller (FL-SFC) was quantitatively analyzed. In addition, the efficacy of a disturbance observer coupled with the FL-SFC for the hydraulic control system was verified in terms of overcoming the control performances deterioration owing to system uncertainty.

Research on Hydraulic System Design and Vehicle Dynamic Modeling for the Development of Tire Roller (타이어 로울러 개발을 위한 유압 시스템 설계 및 차량 동역학적 모델링에 관한 연구)

  • 김상겸;김준호;이운성;김정하
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.2
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    • pp.201-211
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    • 2002
  • In this research, we are trying to research about hydraulic system design and vehicle dynamic modeling far the development of the tire roller. The reason why we would like develop it is that tire roller is one of the most useful machine for the road construction site and application other construction equipments. Here, we conceptualize the new hydraulic system and derive the equations of motion fur dynamic analysis and also investigate system modeling by using a DAQ board. We design the hydraulic circuit of steering and traction mechanism system. This design can be used to create virtual prototypes of construction equipment. So, we studied tire roller to integrate development technology. In system analysis, we formulate hydraulic traction system model and hydraulic steering system model. Also, we integrate DAQ system to acquire experimental results in real tire roller equipment.

A Computer Simulation Method for Dynamic Analysis of Hydraulic Engine Mount System (유압 엔진 마운트의 동특성 해석 컴퓨터 시뮬레이션 방법 연구)

  • 임홍재;최동운;이상범
    • Journal of KSNVE
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    • v.9 no.1
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    • pp.42-48
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    • 1999
  • In this paper, a computer simulation method for dynamic analysis of the hydraulic engine mount system is proposed. The hydraulic engine mount system controls the damping characteristics using the viscosity of fluid flow The complex stiffness of the main rubber of the hydraulic engine mount system is computed by finite element analysis for the viscoelastic materials and hydro-static elements. A numerical analysis method is presented to solve nonlinear equations of the hydraulic engine mount system. which is composed of an engine mass, fluid in inertia track and a vertical inertia force of reciprocating mass in the engine. Also. dynamic properties of the hydraulic engine mount system are analyzed in the frequency domain. Effects of the hydraulic engine mount system running over the rough road are investigated using a vehicle dynamic model. These results are compared with those of the rubber mount system.

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