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한신식(Shin Sik Han) 산업기술교육훈련학회 2018 산업기술연구논문지 (JITR) Vol.23 No.3
The components of a pneumatic control system are connected through pipes, which are actually a distributed parameter system. Although the distributed parameter model produces an accurate representation of pneumatic pipes, its hyperbolic matrix functions are difficult to apply in practical cases. Therefore, it is necessary to develop a simplified mathematical model that describes the dynamic behavior of pneumatic pipes with acceptable accuracy. To this end, this paper presents a simplified lumped parameter model in which the lumping is divided by pipe length. A simulation program was developed using MATLAB/SIMULINK. The transient pressure variation in the closed-ended pipes was calculated and compared with one-, two-, three-, four-, and ten-lump parameter models. There results revealed that the proposed pneumatic control system model incorporating the simplified lumped parameter model represents the physical structure of a pneumatic pipe, without complicating its mathematical description and the simulation program.
김도태,장중걸,한신식 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
Pneumatic cushion cylinders are most widely used as actuators in automatic equipment because they are relatively inexpensive, simple to install and maintain, offer robust design and operation, are available in a wide range of standard sizes and design alternatives. Compressed air is a very expensive form of energy and therefore systems have been proposed to conserve pneumatic energy which mostly means lowering the supply pressure. The purpose of this paper is to compare meter-out and meter-in speed control of high speed pneumatic cushion cylinder. A mathematical simulation model of a double acting pneumatic cushion cylinder used the relief valve type is presented. The dynamic characteristics in the horizontally-mounted pneumatic cylinder, the meter-out and meter-in speed control are investigated with variation of the supply pressure, total mass, effective area of flow control valve, cracking pressure of relief valve, piston rod diameter, stroke, cushion sleeve length etc.
자동차 브레이크 부품의 친환경, 진공표면처리에 관한 연구
상희선(Hie-Sun Sang),한신식(Sin-Sik Han),최석봉(Suk-Bong Chai),최윤석(Yun-Suk Chai),조진식(Jin-Sik Jo),노용규(Yong-Kyu Noh) 한국산업융합학회 2008 한국산업응용학회 학술대회 논문집 Vol.- No.-
The partial vacuum which is environmental the family hour height hits only the mechanical quality of the cost saving which leads a plating surface preparation process improvement and corrosion resistance, durability and within coefficient of friction etc. bought from the research which sees to develop a nitrification surface preparation process, partial vacuum the environment which hits bought and about the nitrification surface preparation product to evaluate a quality about correlation with surface preparation at the time of temperature and ostensible longitude researched, with nitrification of the optimum bought and in case 30 ㎛ chemical compound layer and 3~4 ㎛ oxide layer of S35C and SUM222 side nitrification control to lead formed, the oxidation control after case of two Books of Psalms in compliance with the corronsion resistance accomplished only nitrification control Until the maximum 4 time case improving, the possibility of knowing was. Also the chemical compound layer and oxide layer finely, SUM222 where is formed compared in S35C and the result hold an examination side food dislocation putting out the side food quality which is excellent indolently, this was confirmed.
GMAW Robot에서 Spatter최소 발생 조건에 관한 연구
김한식(Han-Sik Kim),한신식(Shin-Sik Han) 한국산업융합학회 2008 한국산업융합학회 논문집 Vol.11 No.2
GMAW(Gas Metal Arc Welding) processes are usually used in industrial side in order to get its high productivity. But those are only adopted in the semi-automated welding equipment because of a lot of welding spatters. Many industrial robot actually percents from being engaged in the welding processes. The welding spatter problem of causes blocking them being a fully automated welding process.This study was carried out to investigate the optimal conditions for minimizing welding spatter generation at GMAW robot. The spatter can be significantly reduced below 2% of welding spatter generation at the following conditions ; First, below 18V at the wire-feed rate 2.0mm/min Second, below 23V at the wire-feed rate 3.6㎜/min Third, below 24V at the wire-feed rate 5.5㎜/min.
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.
Sn-3.0wt.%Ag-0.5wt.%Cu 솔더 볼 접합부의 고속전단 특성
이영곤 ( Young Gon Lee ),이희열 ( Hee Yul Lee ),문정탁 ( Jeong Tak Moon ),박재현 ( Jai Hyun Park ),한신식 ( Shin Sik Han ),정재필 ( Jae Pil Jung ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.9
The effects of shear speed and tip height on the high speed shear test of Sn-3.0wt.%Ag-0.5wt.%Cu ball joints were investigated. Solder balls of 450 μm in diameter were reflowed at 245℃ on a FR4 PCB (Printed Circuit Board) in order to obtain a sample for the high-speed shear test. The UBM was comprised of Cu/Ni/Au, and the shear speed and tip height varied from 0.5 to 3.0 m/s, and from 10 to 135 μm, respectively. According to the experimental results, faster shear speed enhanced the shear strength of the solder joints, regardless of the tip height. The fraction of ductile (solder) fracture decreased when the shearing speed was raised from 0.5 to 3.0 m/s. With an increasing tip height from 10 to 50 and 135 μm, the fracture mode changed from pad lift to mixed (ductile and brittle) and ductile fracture, respectively, while the shearing energy also increased in the same order. The shear energy had a proportional relationship with the fraction of the solder fracture.