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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Drive and Control
Journal Basic Information
Journal DOI :
Korea Society of Fluid Power & Construction Equipments
Editor in Chief :
Volume & Issues
Volume 12, Issue 4 - Dec 2015
Volume 12, Issue 3 - Sep 2015
Volume 12, Issue 2 - Jun 2015
Volume 12, Issue 1 - Mar 2015
Selecting the target year
Modeling and Controller Design of an Electro-Hydrostatic Actuator
Huh, J.Y. ; Kim, H.H. ; Lee, I.Y. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 1~6
DOI : 10.7839/ksfc.2015.12.2.001
Recently, the Electro-Hydrostatic Actuator(EHA) has been developed as a result of research on energy saving. EHA is usually composed of a direct driven pump from an electric motor and is available to control cylinder displacement or velocity with high efficiency. In addition, it has the advantage of compactness, minimum leakage and availability of decentralized control. In this study, an EHA system was designed to decrease the path tracking error and manufactured for test. The linearization method provided in AMESim software was used to derive the model of EHA system. The derived model was applied to design the PI-D controller to effectively overcome the disturbance. The effectiveness of this controller was verified by further testing.
Development of Wave Power Generator using Horizontal Motions of the Wave
Hwang, S.S. ; Park, I.H. ; Lee, D.S. ; Yang, K.U. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 7~13
DOI : 10.7839/ksfc.2015.12.2.007
In this study, we suggested the wave power generator using horizontal motions of the wave for use in the coastal sea. The length of the horizontal movement of the wave in the vicinity of the sea surface is larger than the length of the vertical reciprocating movement of the wave, hence the proposed device has a wave power transmission plate. In addition, because the motion of the wave is maximum to the sea surface, by arranging the buoyancy tanks at the top of the wave power transmission plate, it is always capable of vertical movement in accordance with the sea surface. To confirm the usefulness of the proposed wave power generator, we constructed a mathematical model of the wave power generator and carried out simulation using bondgraph. Furthermore, the efficiency was verified by measuring the degree of electrical energy production through a preliminary experiment.
Force Synchronizing Control for AC Servomotor-Ball Screw Driven Injection Unit
Cho, S.H. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 14~20
DOI : 10.7839/ksfc.2015.12.2.014
This paper focuses on the issue of force synchronizing control for the injection servomechanism of injection molding machines. Prior to the controller design, a virtual design model was developed for the injection mechanism with an AC servomotor-ball screw. A synchronizing controller is designed and combined with the PID control to accommodate the mismatches between the real plant and the linear model plant used. Due to the plant uncertainty, the stiffness and the damping of the mechanism were considered. From the tracking control simulations based on the virtual design model, it is shown that a significant reduction in force synchronizing error is achieved through the use of a proposed control scheme.
Investigation of the Tribological Effects of the Auxiliary Inner Ring for Piston Shoes at Low Speeds
Lee, S.L. ; Kim, J.H. ; Hong, Y.S. ; Kim, B.K. ; Moon, J.S. ; Moon, J.H. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 21~26
DOI : 10.7839/ksfc.2015.12.2.021
In order to design a swash plate type pump for electro-hydrostatic actuators the performance of the hydrostatic piston shoe bearings in the low speed range needs to be examined, since the pump operates frequently at low speeds, compensating for position control errors as a control element. As a common practice, piston shoes are equipped with inner rings as an auxiliary element to enhance their tribological performance. In this paper, the effects of the inner rings of the piston shoes on the frictional loss and leakage flow rate were investigated, where three piston shoe models, with different inner ring shapes and different inlet orifice sizes, were integrated. The test results showed that a large inner ring and small inlet orifice were advantageous for reducing both the frictional loss and leakage flow rate; this could also be confirmed by computational analyses.
Development of the Flexible Observation System for a Virtual Reality Excavator Using the Head Tracking System
Le, Q.H. ; Jeong, Y.M. ; Nguyen, C.T. ; Yang, S.Y. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 27~33
DOI : 10.7839/ksfc.2015.12.2.027
Excavators are versatile earthmoving equipment that are used in civil engineering, hydraulic engineering, grading and landscaping, pipeline construction and mining. Effective operator training is essential to ensure safe and efficient operating of the machine. The virtual reality excavator based on simulation using conventional large size monitors is limited by the inability to provide a realistic real world training experience. We proposed a flexible observation method with a head tracking system to improve user feeling and sensation when operating a virtual reality excavator. First, an excavation simulator is designed by combining an excavator SimMechanics model and the virtual world. Second, a head mounted display (HMD) device is presented to replace the cumbersome large screens. Moreover, an Inertial Measurement Unit (IMU) sensor is mounted to the HMD for tracking the movement of the operator's head. These signals consequently change the virtual viewpoint of the virtual reality excavator. Simulation results were used to analyze the performance of the proposed system.
Modelling and Test of Down-the-Hole Hammer
Hwang, U.K. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 34~38
DOI : 10.7839/ksfc.2015.12.2.034
Research and development of mineral resource related products has progressed with the increased need to develop mineral resources. The DTH hammer is one a resultant product. However, due to particular work conditions of underground drilling, it is difficult to obtain direct data on the DTH Hammer. A DTH drill rig requires a lot of money and time for actual testing. This thesis aimed to resolve this problem by using CAE. First, the structure of the DTH hammer and the movement was analyzed. Next, a standard model based on simulation was proposed and then experimentation and comparison verification was conducted. In addition, the verified models were applied to products of various sizes, and the models used in simulation were compared by conducting field tests.
Development and Verification of Analytical Model of a Main Control Valve
Kim, D.M. ; Lee, J.M. ; Jung, W.J. ; Jang, J.S. ;
Journal of Drive and Control, volume 12, issue 2, 2015, Pages 39~48
DOI : 10.7839/ksfc.2015.12.2.039
In order to control the actuators of hydraulic machinery such as excavators, various control valves are typically assembled in a single block. Such a control block is called a main control valve(MCV). In this paper, we analyzed the working principle and the particular purpose of the design of all valves included in the MCV system. To Examine the reliability of the analysis model, the pressure drop of the MCV at each port was measured. The authors developed an analytical model of the control valve(main spool, load poppet, pressure relief, make up, and regeneration). The authors considered the notch shape of the spool while developing the analytical models of the main spool valve. Most importantly, at the stage before the analysis model was applied in the design tuning, the reliability was ensured by comparing the analysis results with the test results. This paper showed a process of developing an analysis model that can be utilized in the design and tuning stages.