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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Drive and Control
Journal Basic Information
Journal DOI :
Korea Society of Fluid Power & Construction Equipments
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Volume & Issues
Volume 11, Issue 4 - Dec 2014
Volume 11, Issue 3 - Sep 2014
Volume 11, Issue 2 - Jun 2014
Volume 11, Issue 1 - Mar 2014
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Pressure Pulsation Characteristics of a Multiple-Delivery Radial Piston Hydrulic Pump
Choi, S.R. ; Lim, J.C. ; Lee, I.Y. ;
Journal of Drive and Control, volume 11, issue 2, 2014, Pages 1~8
DOI : 10.7839/ksfc.2014.11.2.001
In this study, the authors carried out experiments and numerical simulations in order to clarify the pressure pulsation characteristics in multiple-delivery rotating-cam and stationary-cylinder type radial piston pumps. Also, a tee filter was applied to the pump in order to mitigate the pressure pulsation. Through the experiments and simulations, it was known that pressure pulsation with a magnitude higher than 40% of the mean load pressure could occur in the pump used in the experiments. Moreover, it was confirmed that a tee filter designed in this study could effectively mitigate the pressure pulsation.
Force Synchronizing Control for 4 Axes Driven Hydraulic Cylinder-Clamping Load Systems
Cho, S.H. ;
Journal of Drive and Control, volume 11, issue 2, 2014, Pages 9~15
DOI : 10.7839/ksfc.2014.11.2.009
This paper deals with the issue of force synchronizing control for the clamping servomechanism of injection molding machines. Prior to the controller design, a virtual design model has been developed for the clamping mechanism with hydraulic systems. Then, a synchronizing controller is designed and combined with an adaptive feedforward control in order to accommodate the mismatches between the real plant and the linear model plant used. As a disturbance, the leakage due to the ring gap with relative motion in the cylinder has been introduced. From the robust force tracking simulations, it is shown that a significant reduction in the force synchronizing error is achieved through the use of a proposed control scheme.
Development of Power Distribution Algorithm for Driving Efficiency Optimization of Independently Driven Vehicle
Park, J.H. ; Song, H.W. ; Jeong, H.U. ; Park, C.H. ; Hwang, S.H. ;
Journal of Drive and Control, volume 11, issue 2, 2014, Pages 16~21
DOI : 10.7839/ksfc.2014.11.2.016
The purpose of this paper is to construct a control algorithm for improving the driving efficiency of 4-wheel-drive in-wheel electric vehicles. The main parts of the vehicle were modeled and the input-output relations of signals were summarized using MATLAB/Simulink. A performance simulator for 4-wheel-drive in-wheel electric vehicles was developed based on the co-simulation environment with a commercial dynamic behavior analysis program called Carsim. Moreover, for improving the driving efficiency of vehicles, a torque distribution algorithm, which distributes the torque to the front and rear wheels, was included in the performance simulator. The effectiveness of the torque distribution algorithm was validated by the SOC simulation using the FTP-75 driving cycle.
Energy Flow Analysis of Working and Driving System of a Wheel Loader
Oh, K.S. ; Kim, H.K. ; Yi, K.S. ; Ko, K.E. ; Kim, P.Y. ; Seo, J.H. ;
Journal of Drive and Control, volume 11, issue 2, 2014, Pages 22~29
DOI : 10.7839/ksfc.2014.11.2.022
This paper presents simulation-based analysis of energy flow of a wheel loader. The objective of this study is to analyze the energy flow of a wheel loader during driving and working. Because the wheel loader powertrain consists of a mechanical and hydraulic powertrain, the generated power from the engine is divided into 2 powertrains. Further, a virtual prediction of energy flow in the powertrains is a key factor in terms of optimal design. Accordingly, the simulation model that is able to predict the virtual energy flow is developed and analyzed in this study. The proposed wheel loader simulation model has been constructed in the Matlab/Simulink environment. It is expected that the developed simulation model will analyze the energy flow and efficiency in the design stage.
Performance Improvement of the Hydrostatic Piston Shoe Bearing of an EHA-Piston Pump under Boundary Friction Conditions
Hong, Y.S. ; Kwon, Y.C. ; Kim, C.H. ; Lee, S.L. ; Kim, B.K. ; Moon, J.S. ; Kim, J.H. ;
Journal of Drive and Control, volume 11, issue 2, 2014, Pages 30~35
DOI : 10.7839/ksfc.2014.11.2.030
The pumps of electro-hydrostatic actuators operate most frequently in boundary lubrication speed range, as they compensate for the position control errors as a control element. When conventional swash plate type piston pumps are applied to electro-hydrostatic actuators, the frictional power losses as well as the wear rate of sliding components, such as piston shoes can increase drastically under the boundary friction condition. In this paper, the power losses of the piston shoes were investigated which were engendered by a frictional solid-to-solid contact and leakage flow rate of their hydrostatic bearing. In order to reduce them, DLC-coating was applied to the swash plate and the ball joint of pistons along with its effects were demonstrated. In addition, it was also shown that the wear rate of the piston shoes could be markedly reduced using the DLC-coated swash plate.