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장중걸(Z. J. Zhang),김도태(D. T. Kim),주민진(M. J. Joo) 유공압건설기계학회 2011 유공압건설기계학회 학술대회논문집 Vol.2011 No.6
The paper deals with the design of a new low-friction seal for a pneumatic cylinder with high speed actuation. The seal performance with variation of the cross sections in piston seals with elastomeric material was investigated to minimize the friction forces using ABAQUS. The contact pressures, stress and strain distributions and frictional forces of the piston seals were investigated with variation of interference fits, supply pressures, friction coefficients. To develop adequate and productive procedures, the finite element models of the piston seals were created and nonlinear analysis of a seal design was conducted in order build further knowledge and understanding of the seal"s performance characteristics.
장중걸(Z. J. Zhang),김도태(D. T. Kim),한신식(S. S. Han) 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
A cushion is used to decelerate the motion of pneumatic cylinder at the end of its stroke to reduce or eliminate noise, to prevent the destruction of the cylinder or external parts, and requce vibration and impact. This paper presents a simulation model of a double-acting pneumatic cylinder with a relief valve type cushion mechanism. This model predicts piston motion, mass flow rate, pressure and temperature time histories. Of interest here is to investigate the effect of cushion ring diameter and length, piston and rod diameter, stroke, supply pressure and relief valve pressure setting.
장중걸(Z. J. Zhang),김도태(D. T. Kim),한신식(S. S. Han) 유공압건설기계학회 2010 유공압건설기계학회 학술대회논문집 Vol.2010 No.6
Nonlinear seal friction in pneumatic cylinders can impede the performance of pneumatic systems designed for high precision positioning with favorable high speed actuation. The behaviour of an elastomeric piston seal in high speed pneumatic cylinders is analysed by nonlinear finite element analysis using ABAQUS. The contact pressures, stress and strain distributions and frictional forces of the piston seal are simulated with variation of interference fits, supply pressures, friction coefficients and piston rod velocities. The nonlinear finite element model of the piston seal is used to predict deformation of a seal, friction force and contact pressure distributions.
고속 공기압 실린더의 피스톤 실 단면형상 변화에 따른 마찰특성
김도태(D. T. Kim),장중걸(Z. J. Zhang) 유공압건설기계학회 2012 드라이브·컨트롤 Vol.9 No.1
The paper deals with the design of a new low-friction seal for a pneumatic cylinder with high speed actuation. The seal performance with variation of the cross sections in piston seals with elastomeric material was investigated to minimize the friction forces using ABAQUS. The contact stress and strain distributions and frictional forces of the piston seals were investigated with variation of interference fits, supply pressures and friction coefficients. To develop adequate and productive procedures, the finite element models of the piston seals were created and nonlinear analysis of a seal design was conducted in order to build further knowledge and understanding of the seal"s performance characteristics.
김도태(D. T. Kim),장중걸(Z. J. Zhang),주민진(M. J. Joo) 유공압건설기계학회 2012 유공압건설기계학회 학술대회논문집 Vol.2012 No.6
The paper describes a technique that compensates a friction in pneumatic cylinder to perform the position control. The friction is one of the most common nonlinearities present in pneumatic actuating systems. For accurate position control and low velocity control, control strategies usually rely on accurate estimation of friction. This paper presents a observer to estimate the friction force in the pneumatic cylinder from the pressures in cylinder chambers. Also, the stiction compensation of a pneumatic cylinder is obtained by adding pulses to the control signal using impulsive control. The characteristics of the pulses in impulsive control are determined from the control action. The simulation results are proved that the method proposed here is effective.
김도태(D. T. Kim),장중걸(Z. J. Zhang) 유공압건설기계학회 2011 드라이브·컨트롤 Vol.8 No.3
Nonlinear seal friction in pneumatic cylinders can impede the performance of pneumatic systems designed for high precision positioning with favorable high speed actuation. The behaviour of an elastomeric piston seals in high speed pneumatic cylinders is analyzed by nonlinear finite element analysis using ABAQUS. The contact pressures, stress and strain distributions and frictional forces of the squeeze type piston seal are simulated with variation of the seal radial installed interference, the operating pressures, friction coefficients and piston rod velocities. The nonlinear finite element model of the squeeze type piston seal is used to predict deformation of a seal, friction force and contact pressure distributions.
김도태(D. T. Kim),장중걸(Z. J. Zhang) 유공압건설기계학회 2013 드라이브·컨트롤 Vol.10 No.1
The paper describes a technique that compensates a friction in pneumatic cylinder to perform the position control. The friction is one of the most common nonlinearities present in pneumatic actuating systems. For accurate position control and low velocity control, control strategies usually rely on accurate estimation of friction. This paper presents a observer to estimate the friction force in the pneumatic cylinder from the pressures in cylinder chambers. Also, the stiction compensation of a pneumatic cylinder is obtained by adding pulses to the control signal using impulsive control. The characteristics of the pulses in impulsive control are determined from the control action. The simulation results are proved that the method proposed here is effective.