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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 18, Issue 12 - Dec 2001
Volume 18, Issue 11 - Nov 2001
Volume 18, Issue 10 - Oct 2001
Volume 18, Issue 9 - Sep 2001
Volume 18, Issue 8 - Aug 2001
Volume 18, Issue 7 - Jul 2001
Volume 18, Issue 6 - Jun 2001
Volume 18, Issue 5 - May 2001
Volume 18, Issue 4 - Apr 2001
Volume 18, Issue 3 - Mar 2001
Volume 18, Issue 2 - Feb 2001
Volume 18, Issue 1 - Jan 2001
Selecting the target year
Human Sensibility and Sensible Technology
Lee, Gu-Hyeong ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 9~13
Measurement of Emotion and Sensibility Using Physiological Signals
Sohn, Jin-Hun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 14~25
Industrial Design, Ultimate Synthesizer of Emotional Engineering
Lee, Kun-Pyo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 26~31
A Automobile and Human Sensibility Ergonomics
Park, Se-Jin ; Kim, Seon-Ung ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 32~39
Human Sensibility Ergonomics and Virtual Reality Technologies
Wohn, Kwang-Yeon ; Park, Jae-Hee ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 40~45
Psycho-Physiological Effect of Odors on Human Being
Min, Byeong-Chan ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 46~53
가공면의 상태 변화 측정에 관한 연구
Cho, Nam-Gyoo ; Choi, Han-Kwang ; Han, Chang-Soo ; An, Yoo-Min ; Park, Gyun-Myung ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 54~62
This paper describes a new method for measuring the changes in specific surface asperities arising from processes such as finishing, coating, wear and corrosion. In repetitive measurements, relocation device gives the same position and orientation so that specific profile can be obtained. A low-cost relocation device is designed and its performance is assessed. The error in relocation process is compensated by statistic compensation algorithm. And, a removing process of cusp by grinding is observed by the proposed method.
DADS 및 MSC/NASTRAN을 이용한 다물체계 유연물체의 동역학 해석
Kim, Chang-Bu ; Baek, Yun-Gi ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 63~71
This paper introduces a method for calculation of dynamic stress occurring in flexible bodies of a moving multibody system by using commercial softwares DADS for dynamic analysis and MSC/NASTRAN for finite element analysis. Three methods for model transient response analysis of a flexible body are summarized. Elastic deformation of a flexible body can be described with normal modes and static modes composed of constraint modes and residual attachment modes. The deformation modes divided into fixed-interface modes and free-interface modes can be determined by using MSC/NASTRAN and selected for dynamic analysis. The dynamic results obtained from DADS are utilized to calculate dynamic stress by using mode-displacement method or mode-acceleration method of MSC/NASTRAN. As a numerical example of the analysis, we used a three dimensional slider-crank model with a flexible connecting rod.
칼만필터를 이용한 3점식 정도측정에 관한 연구
Lee, Yeong-Jin ; Joun, Seung-Yun ; Jung, Keum-Young ; Kim, Jong-Hwa ; Bae, Jong-Il ; Lee, Man-Hyung ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 72~78
Roundness measurement method using three displacement sensors makes in-process roundness measurement possible on the NC machine because it eliminates the vibration signal and eccentricity signal from measured roundness signal from the workpiece. But there are noises in measured signals, it isn't possible to measure the roundness with high precision. In this study, a high precision in-process roundness measurement system is development, which can eliminate vibrations of the spindle by using three displacement sensors and which can also estimate the noisy roundness measurement signals by applying Kalman filter.
A Study on Verification of NC Code of Multi-spindles Drilling for Tube Sheet in Heat Exchanger
Oh, Byeong-Hwan ; Lee, Hui-Gwan ; Yang, Gyun-Ui ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 79~83
A verification of multi-spindles drilling NC data is presented. The drilling of multi-spindles can offer productivity over three times as fast as that of single spindle. The most important things in machining tube sheet are precision of hole position and machining time. The drilling of multi-spindles has difficulties in controlling many motors to drive spindles and assign a correspondent number to each spindles. Multi-spindles drilling has different codes from CNC milling ; many subroutines, assignment of spindle, and so on. The conventional method, which inspects the NC code of the drilling, is to drill holes on a thin plate or tube sheet previously. The method results in low productivity because it consumed long machining time and welding for correction. This paper describes details of multi-spindles NC code and operation of multi-spindles drilling machine. A verification software of the multi-spindles drilling NC code is developed on the details.
Machinability Evaluation with Cutting Direction in High Speed Machining of Free Form Surface through Ball End Milling
Kim, Gyeong-Gyun ; Gang, Myeong-Chang ; Lee, Deuk-U ; Kim, Jeong-Seok ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 84~89
In recent years, there is increasing demand of esthetic design and complex function in aerospace, automobile and die/mold industry, which brings into limelight high-precision, high-efficient machining of sculptured surface. This paper deals with the establishment of the optimal tool path on free form surface in high speed ball end milling. Ball end milling is widely used for free form surface die and mold. In this machining, the cutting direction was changed with tool path. The cutting characteristics, such as cutting force and surface form are varied according to the variation of cutting directions. In this paper, the optimal tool path with down cutting in free form surface cutting is suggested.
An Analysis of the Relationship between Surface Profile Error of f-
Lens and Optical Performance
Kim, Dong-Sik ; Lee, In-Yong ; Kim, Hyeong-Chae ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 90~95
len is one of the important parts in Laser Scanning Unit because it affects on the optical performance of Laser Scanning Unit dominantly. It is necessary to find out the relationship between the surface profile error of f-
lens and the beam profile focusing on the Organic Photo Conductive drum in order to analysis the beam profile problems such as appearance of side lobe and expansion of center lobe. In this research, a simulation process which relates the surface profile characteristics to the beam profile has been developed by CODE V. The simulated beam profile also have been compared with the measurement results.
Temperature Characteristics of High Speed Angular Contact Ball Bearing
Hyeon, Jun-Su ; Park, Tae-Jo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 96~101
This paper shows the temperature characteristics of a high speed angular contact ball gearing which is 7004C type with ISO P2 tolerance class. A built-in motor type high speed spindle which adopts an oil-air lubrication system was used to measure the temperature rise up to 60,000rpm. The gearing temperature was measured using thermocouples that were attached to the outside surfaces of the outer rings. The result showed that the continuous test method which was suggested in this paper is more effective than on and off method and the lubrication oil supply rate should be reduced in high speed rolling bearings as long as the seizure does not occur. And the result were confirmed that the bearings packed with ceramic balls are superior to those with steel balls in temperature characteristics.
A Study of Wire Sweep, Pre-conditioning and Paddle Shift during Encapsulation of Semiconductor Chips
Han, Se-Jin ; Heo, Yong-Jeong ; Lee, Seong-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 102~110
In this paper, methods to analyze wire sweep and paddle shift during the semiconductor ship-encapsulation process have been studied. The analysis of wire sweep includes flow-field analysis in a complicated geometry, drag-force calculation for given flow of fluid, and wire-deformation calculation for given loads. The paddle-shift analysis is used to analyze the deformation of the paddle due to the pressure difference in two cavities. the analysis is done using either analytical solutions or numerical simulation. The analytical solution is used for rough but fast calculation of wire sweep. The numerical solution is used for more accurate calculation of wire-sweep. The numerical results of wire sweep show good agreements with the experimental ones.
Fabrication of Tungsten Probe using Electro-Chemical Etching
In, Chi-Hyun ; Kim, Gyu-Man ; Chu, Chong-Nam ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 111~118
Tungsten probe is the most important part of a probe card, which is widely used for the performance test of wafer chips. Electro chemical etching becomes an exclusive choice for mass production of the tungsten probes. In the mass production, not only the shape of the probe but also the shape distribution of machined probes is important. A new method is proposed for the mass production of the tungsten probes. Tungsten wires are separated by a distance, and dipped into electrolyte. The dipping rate is controlled to shape the probes. Several experimental tests are performed to study the machining characteristics. From the test results, machining parameters including electrical conditions and anode position showed significant influences on the shape, repeatability, precision and quality of sharp tips.
Active control of the Self-excited Vibration of a Rotor System Supported by Tilting-Pad Gas Bearing
Kwon, Tae-Gyu ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 119~125
This paper presents an experimental study on active control of self-excited vibration for a high speed turbomachinery. In order to suppress the self-excited vibration, it is necessary to actively control the air film pressure or the air film thickness. In this study, active pads are used to control the air film thickness. Active pads are supported by pivots containing piezoelectric actuators and their radial position can be actively controlled by applying voltage to the actuators. The transfer characteristics from actuator inputs to shaft vibration outputs are experimentally investigated. In a tilting-pad gas bearing (TPGB), a shaft is supported by the pressurized air film. Four gap sensors were used to measure the vibration of the shaft and PID was used in the feedback control of the shaft vibration. The experimental results show that the self-excited vibration of the rotor can be effectively suppressed if the PID controller gains are properly chosen. As a result we find that the feedback control is effective for suppressing the self-excited vibration of a rotor system using stack-type PZT actuators.
Improvement of Estimation Accuracy of Thermal Deformation on Machine Tool by Inverse method
Lee, Jong-Du ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 126~131
One of the major obstacles in testing or evaluating precisely the thermal behavior of a machine tool is the difficulty in measuring the heat transfer coefficients on the surfaces by a conventional method. This paper presents a new approach based on the inverse method to identify the values of heat transfer coefficients by using temperature changes measured on the surfaces of a machine tool during a short period in its operating. In the present method, a machine tool structure is modeled by the finite element method and the characteristic curves of the temperature change at several points on machine tool surfaces are theoretically derived in the form that they contain the heat transfer coefficient as an unfixed heat source are approximated so that the theoretical characteristic curves of temperature change fit the measured ones as closely as possible.
A Study on Improved Mechanism of AGV System
Song, Jun-Yeop ; Lee, Seung-U ; Kim, Gap-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 132~139
In this research, we have developed a load/unload device capable of correcting the position automatically. Characteristic technologies such as compensation, control, guidance and communication have been modified and implemented on an existing electromagnetic guided AGV, helping to realize open system and distributed cooperation. We have applied the developed AGV with remote control and heterogeneous load/unload mechanisms in a machining system composed of various equipment such as machining centers, CMN and AS/RS and found that the AGV provided position error within
The Shape Optimization of TCP to Reduce the Line Defects of LCD Module
Park, Sang-Hu ; Lee, Bu-Yun ; Kim, Won-Jin ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 140~145
The tape carrier package(TCD) is one of the most important components in a liquid crystal display(LCD) module. It has a role to transmit electrical signals from a printed circular board(PCB) to a display panel. If TCP is damaged under mechanical shock, the signals can not be transmitted to the panel and as a result, some dead lines are generated on the panel. This kind of phenomenon is commonly called as 'line defects'. In this paper, new structural design concepts of TCP are proposed to guarantee its reliability by using Taguchi's approach and dynamic FE-analysis. The line defects problem of TCP module is solved by replacing the original TCP with the newly designed one.
Dynamic Slant Interface Crack Propagation Behavior under Initial Impact Loading
Lee, Eok-Seop ; Park, Jae-Cheol ; Yun, Hae-Ryong ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 146~151
The effects of slant interface in the hybrid specimen on the dynamic crack propagation behavior have been investigated using dynamic photoelasticity. The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamic stress field around the dynamically propagating inclined interface crack tip in the three point bending specimens. The dynamic load is applied by a hammer dropped from 0.08m high without initial velocity. The dynamic crack propagation velocities and dynamic stresses field around the interface crack tips are investigated. Theoretical dynamic isochromatic fringe loops are compared with the experimental reults. It is interesting to note that the crack propagating velocity becomes comparable to the Rayleigh wave speed of the soft material of a specimen when slant angle decreases.
Optical Error Analysis and Compensation of Six Degrees of Freedom Measurement System Using a Diffraction Grating Target
Kim, Jong-Ahn ; Bae, Eui-Won ; Kim, Soo-Hyun ; Kwak, Yoon-Keun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 152~160
Six degrees of freedom measurement systems are required in many fields: Precision machine control. precision assembly, vibration analysis, and so on. This paper presents a new six degrees of freedom measurement system utilizing typical features of a diffraction grating. It is composed of a laser source, three position sensitive detectors, a diffraction grating target, and several optical components. Six degrees of freedom displacement is calculated kinematically from the coordinates of diffracted rays on the detectors. Optical measurement error was caused by the fact that a laser source had a Gaussian intensity distribution. This error was analyzed and compensated using simple equations. The performance of the compensation equation was verified in the experiment. The experimental results showed that the compensation equation could reduce the optical measurement error remarkably and the error in six degrees of freedom measurement less than
m for translation and
Drilling Properties of Water-Based Metal Working Fluid Containing Fatty Acid and Polyethylene Glycol
Kim, Yeong-Un ; Jeong, Geun-U ; Yun, Yu-Jeong ; Kim, Se-Hun ; Gang, Seok-Chun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 161~170
Synthetic water-based metal-cutting fluids are increasingly popular in the metal-working industry because of its environmental friendliness. The propose of this study is to investigate the synergistic effect of combining polyethylene glycol and common fatty acid in formulating a metal-cutting fluid. The tested metals were aluminum, copper and steel, and the test was performed with a modified drilling machine. From the study, it was found that there existed some synergistic effects on the drilling efficiency of the metals to decrease of cutting time, cutting energy, torque as well as the smoothness of surface depended on the formulation ratio of the two fluids.
A Study on Heat Source Model to Creep Feed Grinding
Jeong, Jong-Dal ; Jeong, Hae-Do ; Choe, Heon-Jong ; Kim, Nam-Gyeong ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 171~176
This study focuses on the energy partition and heat flux distribution in creep-feed grinding. From the measurements of transient grinding temperature in the workpiece which the thermocouple was embedded, the overall energy partition to the workpiece was estimated with moving heat source theory using the developed scalene triangle heat model. The energy partition was calculated as 3.75% in down grinding smaller than 5.3% in up grinding. Also, the scalene triangle heat model was confirmed as the most optional heat model in correspond to the experimental data. Then, the heat flux distribution was calculated from temperature responses. The heat flux is negative behind the grinding zone where fluid was applied. In this experimental result, the total heat flow to the workpiece per unit width obtained by integrating the positive heat flux was 0,7W/mm for down grinding.
Process Design and Forming Analysis of Permalloy Shielding Can for Instrument Cluster
Kim, Dong-Hwan ; Lee, Seon-Bong ; Kim, Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 177~185
This study shows the process design and forming analysis of permalloy shielding can that support the automobile multi-display parts to indicate the accurate information of car. This study is particularly important, since the strain and thickness of permalloy shielding can is known to affect the magnetic properties such as coercivity and permeability quite thickness of permalloy shielding can is known to affect the magnetic properties such as coercivity and permeability quite sensitively. The objective functions are strain and thickness deviation. The punch radius, die radius and blank holding force are considered as design parameters. Orthogonal array (OA) table and characteristics are applied to neural network (NN) as train data. After training, the optimal and robust condition of design parameters is selected. This study shows the correlation between the design methodology of NN and the statistical design of experiments (DOE) approach.
Stress Intensity Factors for a Crack in a Nonlinear Electrostrictive Material
Beom, Hyeon-Gyu ; Jeong, Eun-Do ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 186~191
A crack with electrically impermeable surfaces in an electrostrictive material subjected to uniform electric loading is analysed. The effect of electric yielding on stress intensity factor is investigated by using a small scale yielding model and a strip yield zone model. Complete forms of electric fields and elastic fields are derived by using complex function theory. The electrical yield zone shapes for two models are different each other. The two models, however, predict similar yield zone sizes under the small scale yielding conditions. It is found that the influence of electric yielding on the stress intensity factor is insensitive to the modeling of the electrical yield zone shape.
Position Synchronous Control of a Two-Axes Driving System by H
Byun, Jung-Hoan ; Yeo, Dong-Jun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 192~198
In this study, a methodology of synchronous control which can be applied to position synchronization of a two-axes driving system has been developed. The synchronous error is caused by model uncertainties and torque disturbance of each axis. To overcome these problems, the proposed synchronous control system has been composed of two speed controllers and one synchronous controller. The speed controllers based on PID control law are aimed at the following to speed reference. And the parameters of speed controllers have been designed in order that speed response of the second axis corresponds with one of first axis. Especially, considering to model uncertainties of each axis, the synchronous controller has been designed using H
control theory. The controller eliminates the synchronous error by controlling speed of the second axis. The effectiveness of the proposed method has been verified through simulation.
Development of Expert System for Burr Formation in Face Milling
Ko, Sung-Lim ; Kim, Young-Jin ; Ko, Dae-Cheol ; Han, Sang-U ; Lee, Je-Yeol ; Ahn, Yong-Jin ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 199~205
Burr makes troubles on manufacturing process due to deburring cost, quality of products and productivity. This paper described the results of experimental study on the influence of the cutting parameters on the formation of exit burrs in face milling. Using the results of experimental study, burr types are classified and data bases are developed to predict burr formation result. From the CAD file for work geometry and the NC data for tool path, the exit angles are calculated at every edges. This program predicts the burr geometry at exit edges using the prediction algorithm and data bases which are developed experimentally. Simulation results on deformation strain and temperature are also available in specific 2-dimensional cutting conditions. Also algorithm which can determine the exit angle is proposed.
Overlapping Decentralized Robust EA Control Design for an Active Suspension System of a Full Car Model
Jung, Yong-Ha ; Choi, Jae-Weon ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 206~213
An overlapping decentralized robust EA(eigenstructure assignment) controller is designed for an active suspension system of a vehicle based on a full car model with 7-degree of freedom. Using overlapping decomposition, the full car model is decentralized by two half car models. For each half car model, an effective and disturbance suppressible controller can be obtained by assigning appropriately a left eigenstructure of the system. The performance of the proposed overlapping decentralized robust EA controller is compared with that of a conventional centralized EA controller through computer simulations.
Design of 3-component Force/Moment Sensor with Force/Moment Ratio of Wide Range
Kim, Gap-Sun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 2, 2001, Pages 214~221
This paper describes the design of 3-component force/moment sensor with the force and moment ratio of wide range. It can measure the x-direction force Fx, y-direction force Fy and z-direction moment Mz simultaneously. In order to accurately measure forces and moment using 3-component force/moment sensor, it should get suitable force and moment ratio(the ratio of force Fx=200 N and moment Mz=20 Nm is ten to one), and small interference error. In this paper, in order to design the 3-component force/moment sensor with the force and moment ratio of wide range, the procedures are performed as follow : 1) the derivation of the equations to predict the bending strains on the surfaces of the plate-beams under the force or the moments, 2) the determination of the size of the sensing elements of the force/moment sensor by using the derived equations, 3) the Finite Element Method(FEM) analysis and the characteristic test for confirming the strains from the theory analysis, 4) the selection of the attachment locations of the strain gages of each sensor, 5) the analysis of the rated strain and the interference error at the attachment location of strain gages. It reveals that the rated strains calculated from the derived equations make a good agreement with the results from the Finite Element Method analysis and the characteristic test.