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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
Editor in Chief :
Volume & Issues
Volume 19, Issue 12 - Dec 2002
Volume 19, Issue 11 - Nov 2002
Volume 19, Issue 10 - Oct 2002
Volume 19, Issue 9 - Sep 2002
Volume 19, Issue 8 - Aug 2002
Volume 19, Issue 7 - Jul 2002
Volume 19, Issue 6 - Jun 2002
Volume 19, Issue 5 - May 2002
Volume 19, Issue 4 - Apr 2002
Volume 19, Issue 3 - Mar 2002
Volume 19, Issue 2 - Feb 2002
Volume 19, Issue 1 - Jan 2002
Selecting the target year
Design and Control of Nano-Precision Machine Systems
Kim, Seung-Woo ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 13~17
Nano-turning Technology Using Ultraprecision Machining System
Kim, Geon-Hui ; Hong, Gwon-Hui ; Kim, Sang-Seok ; Won, Jong-Ho ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 18~24
Technical Trends of Nanometrology
Eom, Tae-Bong ; Park, Byung-Chon ; Kim, Jae-Wan ; Eom, Cheon-Il ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 25~32
Nanotribology - Prospects and Applications in Ultra-precision Micro-systems
Kim, Dae-Eun ; Sung, In-Ha ; Chung, Koo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 33~42
Thermal System Analysis to Optimize Torch Position in The Core Making Machine.
Han, Geun-Jo ; Ahn, Sung-Chan ; Shim, Jae-Joon ; Han, Dong-Seop ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 43~47
The new core making method economizing the amount of core sand has been requested. The new method is that a core box is heated until it reaches reasonable temperature and then core sand with core binder is sprayed into the core box. Since inner temperature distribution have to be uniform in order to form uniform thickness of core, we studied inner temperature distribution of core box. First, we determined proper number of torches and optimized torch positions to minimize the average of absolute deviation(AVEDEV) of inner temperature. The results are as fellowed: 1. The number of torches that enables uniform inner temperature distribution about
is 25. 2. When
is 0.7, the torch positions are optimized and AVEDEV is 5.85.
Analysis of the Recognition Ability of Objects for the Smart Sensor According to the Input Condition Changing ( I )
Hwang, Seong-Youn ; Hong, Dong-Pyo ; Chae, Hee-Chang ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 48~55
This paper deals with the sensing ability of the smart sensor that has the sensing ability to distinguish materials according to the input condition changing. This is a study of dynamic characteristics of sensor. We have developed a new signal processing method that can distinguish among different materials. The smart sensor was developed for recognition of materials. Experiments and analysis were executed to estimate ability to recognize objects according to the input condition. First, we developed the advanced smart sensor. Second, we developed the new method, which has the capability sensing of different materials. Dynamic characteristics of the smart sensor were evaluated relatively through a new
method. According to frequency changing, influence of the smart sensor are evaluated through a new recognition index (
) that ratio of sensing ability index. Applications of this method are for finding abnormal conditions of objects (auto-manufacturing), feeling of objects (medical product), robotics, safely diagnosis of structure, etc.
Research into Head-body Thermal Bending for High-accuracy Thermal Error Compensation
Kim, Tae-Weon ; Hah, Jae-Yong ; Ko, Tae-Jo ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 56~64
Machine tools are engineered to give high dimensional accuracy in machining operation. However, errors due to thermal effects degrade dimensional accuracy of machine tools considerably, and many machine tools are equipped with thermal error compensation function. In general, thermal errors can be generated in the angular directions as well as linear directions. Among them, thermal errors in the angular directions contribute a large amount of error components in the presence of offset distance as in the case of Abbe error. Because most of thermal error compensation function is based on a good correlation between temperature change and thermal deformation, angular thermal deformation is often to be the most difficult hurdle for enhancing compensation accuracy. In this regard, this paper investigates the effect of thermal bending to total thermal error and gives how to deal with thermally induced bending effects in thermal error compensation.
Finite Element Analysis on the Motion Accuracy of Hydrostatic Table (
. Analysis and Experimental Verification on Double Sides Table)
Park, Chun-Hong ; Lee, Hu-Sang ; Kim, Tae-Hyoung ; Kim, Min-Gi ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 65~70
An analysis method for calculating motion accuarcy of double sides hydrostatic table is proposed in this paper. In this method, profiles of each rails are assumed as periodic function, therefore it is represented as the sum of spacial frequencies. Bearing clearance at any position rail is depended on the variation of linear, angular motion error of table and the form errors of both sides of a rail. Finite element method is applied to calculate pressure distributions in bearing clearance. In order to simplify the analyzing process, double sides table model is converted into equivalent single side table model. Results calculated by the proposed modeling method agree well with the results directly caculated by double sides modeling method, and also agree well with experimental results. From the theoretical and experimental analysis, it is verified that the proposed analysis method is very effective to analyze the motion accuracy of double sides hydrostatic table.
A Study for Active Vibration Control of a Automotive Suspension System Using Electro-magnetic Damper
Lee, Gyeong-Baek ; Kim, Yeong-Bae ; Lee, Hyeong-Bok ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 71~78
This paper is concerned with the design and implementation of magnetic damper system to reduce the vibration of suspension system actively. Cylindrical type electro-magnetic actuator with permanent magnet is analyzed and effective controller design is made. Magnetic force analyzed and transfer function for the total system is determined by experimental data using error minimization method. For experiments, simple suspension structure system is utilized, in which a magnetic damper composed of permanent magnet and digital controller is attached. In order to drive the system, bipolar power amplifier of voltage control type is utilized. Stable and high speed control board is used to perform digital control logic for the given system. This paper shows that the magnetic damper system using phase-lead controller excellently reduces vibration of 1-D.O.F (degree of freedom) suspension system.
A Study on Progressive Working of Electric Product by the using of Fuzzy Set Theory
Kim, Jae-Hun ; Kim, Yeong-Min ; Kim, Chul ; Choi, Jae-Chan ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 79~92
This paper describes a research work of developing computer-aided design of a product with bending and piercing for progressive working. An approach to the system for progressive working is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories, experimental results and the empirical knowledge of field experts. The system has been written in AutoLISP on the AutoCAD with a personal computer and is composed of four main modules, which are input and shape treatment, flat pattern layout, strip layout and die layout modules. The system is designed by considering several factors, such as bending sequences by fuzzy set theory, complexities of blank geometry, punch profiles, and the availability of a press equipment. Strip layout drawing generated in the strip layout module is presented in 3-D graphic farms, including bending sequences and piercing processes with punch profiles divided into for external area. The die layout module carries out die design for each process obtained from the results of the strip layout. Results obtained using the modules enable the manufacturer for progressive working of electric products to be more efficient in this field.
A Study on Determination of Shear Center of Beam Having Arbitrary Cross Section
O, Taek-Yeol ; Byeon, Chang-Hwan ; Yu, Yong-Seok ; Gwon, Yeong-Ha ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 93~98
It is important to determinate the shear center of beam having arbitrary cross-section in structures. In this study, we have introduced the determination of shear center that gets the equivalent stiffness matrix representing arbitrary cross section of beam and applies energy equivalence theory. This method shows the results of applying on examples that we know the exact and approximate solution of open and cross section of beam. This study also compares with the shear center of composite rotor blade got by the experiment and by the suggested method.
A Study on Corrective Polishing Using a Small Flat Type Polisher
Kim, Eui-Jung ; Shin, Keun-Ha ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 99~106
For the development of a ultra-precision CNC polishing system including on-machine measurement system, we study a corrective polishing algorithm. We calculated unit removal profiles for various flat type polishing tools and polishing tool positions. Using these results we simulate the corrective polishing process based on dwell time control. We calculate dwell time distributions and residual error of the polishing simulation method and the FFT calculation method. We test corrective polishing algorithm with an optical glass. The target removal shape is a sine wave that has amplitude 0.3 micro meters. We find this polishing process has a machining resolution of nanometer order and is effective for sub-micrometer order machining. This result will be used for the software development of the CNC polishing system.
An Automated Process Planning and Die Design System for Quasi-axisymmetric Cold Forging Product
Park, Jong-Ok ; Lee, Jun-Ho ; Jeong, Seong-Yun ; Kim, Cheol ; Kim, Mun-Saeng ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 107~118
This paper deals with an automated computer-aided process planning and die design system by which designer can determine operation sequences even if they have a little experience in process planning and die design of quasi-axisymmetric cold forging product by cold former working. The approach to the system is based on knowledge-based rules and a process knowledge base consisting of design rules is built. Knowledge for the system is formulated from plasticity theories, empirical results and the empirical knowledge of field experts. Programs for the system have been written in AutoLISP for the AutoCAD using a personal computer. An attempt is made to link programs incorporating a number of expert design rules with the process variables obtained by commercial FEM softwares, DEFORM and ANSYS, to form a useful package. The system is composed of three main modules and five sub-modules. The process planning and die design module considers several factors, such as the complexities of preform geometry, punch and die profiles, specifications of available cold farmer, and the availability of standard parts. As the system using 2D geometry recognition is integrated with the technology of process planning, die design, and CAE analysis, the standardization of die parts for wheel bolt requiring cold forging process is possible. The developed system makes it possible to design and manufacture quasi-axisymmetric cold forging product more efficiently.
Vision Based Position Control of a Robot Manipulator Using an Elitist Genetic Algorithm
Park, Kwang-Ho ; Kim, Dong-Joon ; Kee, Seok-Ho ; Kee, Chang-Doo ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 119~126
In this paper, we present a new approach based on an elitist genetic algorithm for the task of aligning the position of a robot gripper using CCD cameras. The vision-based control scheme for the task of aligning the gripper with the desired position is implemented by image information. The relationship between the camera space location and the robot joint coordinates is estimated using a camera-space parameter modal that generalizes known manipulator kinematics to accommodate unknown relative camera position and orientation. To find the joint angles of a robot manipulator for reaching the target position in the image space, we apply an elitist genetic algorithm instead of a nonlinear least square error method. Since GA employs parallel search, it has good performance in solving optimization problems. In order to improve convergence speed, the real coding method and geometry constraint conditions are used. Experiments are carried out to exhibit the effectiveness of vision-based control using an elitist genetic algorithm with a real coding method.
Study on the Direct Steering System using Rack and Pinion for Ultra-Small Vehicles
Kim, Soon-Ho ; Kang, Min-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 127~134
This study present a direct steering system using rack and pinion for ultra-small vehicles. The traditional small vehicles for special use had the limitation of space by reason of short wheel tread. These vehicles has adopted a indirect steering system or a center arm system for steering. The disadvantages of these system were deterioration of gear efficiency and increase of parts. For direct-linkage to both knuckles, steering system is made up of out-side tie rods, tie-rod ends, and gear box. Thus, the proposed system has a minimum number of parts. The experimental results show a maximum efficiency at minimum steering angle and a minimum clearance circle. These effects were accomplished by adopting a Ackerman-Jantaud theory.
Control of the Residual Vibration of Crane Using Equivalent Input Shaper
Park, Un-Hwan ; Lee, Jae-Won ; Noh, Sang-Hyun ; Yoon, Ji-Sup ; Park, Byung-Suk ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 135~142
Input shaping is a method for reducing residual vibration in computer controlled machines. Vibration is eliminated by convolving a sequence of impulses, an input shaper, with a desired system command to produce a shaped input. This paper shows the shape of sensitivity curve of input shaper as impulse interval T and analysis of robustness for input shaper on the z-plane. And a method is presented for designing equivalent input shaper considering sampling time
. And then we applied equivalent input shaper to crane system.
A Study on a Detachment of a Permanent Magnet Wheel for a Wall-Climbing Mobile Robot using Magnetic Inducement
Han, Seung-Chul ; Yi, Hwa-Cho ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 143~149
Robot are necessary to automate the work on a vertical plane of work piece to produce a large structure like a ship, so that a permanent magnet wheel has been attempted to be used for a mobile robot. Its adhesive power was enhanced by restricting the occurrence direction of magnetic flow. Furthermore a method which weakened the adhesive force was developed for easy detachement of the wheel by changing magnetic flow with metal pin. To measure the characteristics of the adhesive and detaching farces, a load call and a gaussmeter were used. The result showed that the adhesive power was reduced to 1/3 of normal state by using 4 inducing pins.
On the Number of Modes Required to Observe Forces in Flexible Structures
Kim, Joo-Hyung ; Kim, Sang-Sup ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 150~157
The number of required modes to provide accurate force information in a truncated model of a flexible structure is investigated. In the case of modal truncation of a distributed parameter system, the difference in convergence rates between displacements and forces is discussed. The residual flexibility. a term from past literature, is used to recapture some of the lost force information in a truncated model. This paper presents numerical and experimental results of a study where the residual flexibility is used in conjunction with a Kalman filter so that accurate force information may be obtained from a small set of displacement measurements wish a reduced-order model. The motivation for this paper is to be able to obtain accurate information about unmeasurable dynamic reaction forces in a rotating machine for diagnostic and control purposes.
A Study on the Enhancement of Ultrasonic Signal Recognition in Ferrite Carbon Steel Weld Zone Using Neural Networks
Yun, In-Sik ; Park, Won-Kyou ; Yi, Won ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 158~164
This paper proposes the optimization of ultrasonic signal recognition in ferrite carbon steel weld zone using neural networks. For these purposes, the ultrasonic signals for defects as porosity, incomplete penetration and slag inclusion in the weld zone are acquired in the type of time series data. And then their applications evaluated feature extraction based on the time-frequency-attractor domain(peak to peak, rise time, rise slope, fall time, fall slope, pulse duration, power spectrum, and bandwidth) and attractor characteristics (fractal dimension and attractor quadrant) etc. The proposed neural networks system in this study can enhances performance of ultrasonic signal recognition.
Characteristics of a Sliding Mode Controller with Disturbance Estimator
Choe, Seung-Bok ; Ham, Jun-Ho ; Park, Jong-Seong ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 165~171
The conventional sliding mode control(SMC) technique requires a priori knowledge of the upperbounds of disturbances or/and modeling uncertainties to assure robustness. This, however, may not to be easy to obtain in practical situation. This paper presents a new methodology, sliding mode control with disturbance estimator(SMCDE), which offers a robust control performance without a priori knowledge about the disturbance. The proposed technique is featured by an average value of the imposed disturbance over a certain period. A nonlinear spring-mass-damper system is adopted as an illustrative example, and a comparative work between the conventional technique and the present one is undertaken.
A New Hand-eye Calibration Technique to Compensate for the Lens Distortion Effect
Chung, Hoi-Bum ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 172~179
In a robot/vision system, the vision sensor, typically a CCD array sensor, is mounted on the robot hand. The problem of determining the relationship between the camera frame and the robot hand frame is refered to as the hand-eye calibration. In the literature, various methods have been suggested to calibrate camera and for sensor registration. Recently, one-step approach which combines camera calibration and sensor registration is suggested by Horaud & Dornaika. In this approach, camera extrinsic parameters are not need to be determined at all configurations of robot. In this paper, by modifying the camera model and including the lens distortion effect in the perspective transformation matrix, a new one-step approach is proposed in the hand-eye calibration.
A Study on the Manufacture of Aluminum Tie-Rod End by Casting/Forging Process
Kim, Hyo-Ryang ; Seo, Myung-Kyu ; You, Min-Su ; Bae, Won-Byong ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 180~185
Aluminum casting/forging process is used to produce an aluminum tie-rod end for the steering system of automobiles. Firstly, casting experiments were carried out to get a good preform for forging the tie-rod end. In the casting experiment, the effects of additives, Ti+B, Zr, Sr, and Mg, on the mechanical properties and the microstructure of a cast preform were investigated. And a finite element analysis was performed to determine an optimal configuration of the cast preform. Lastly, a forging experiment was carried out to make the final product of aluminum tie-rod end by using the above cast preform. In the casting experiments, when 0.2% Ti+B and 0.25% Zr were simultaneously added into molten Al-Si alloy, the highest values of tensile strength and elongation of the cast preform were obtained. When 0.04% Sr were added into the molten aluminum alloy, the finest silicon-structure was observed in the cast preform. The highest hardness was obtained when 0.2% Mg was added. In the forging experiment, It was confirmed that the optimal configuration of a cast preform predicted by FE analysis was very useful. The hardness of a cast/forged product using designed preform was superior to that of required specification.
Characterization of the Chemical Mechanical Micro Machining for Single Crystal Silicon
Jeong, Sang-Cheol ; Park, Jun-Min ; Lee, Hyeon-U ; Jeong, Hae-Do ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 186~195
The mechanism of micro machining of reacted layer on silicon surface were proposed. The depth of reacted layer and the change of mechanical property were measured and analyzed. Depth of hydrated layer which is created on the surface of silicon by potassium hydrate was analyzed with SEM and XPS. The decrease of the micro victors hardness of silicon surface was shown with the increase of the concentration of potassium hydrate and the change of the dynamic friction coefficient by chemical reacted layer was measured due to the readiness of machining. The experiment of groove machining was done with 3-axis machine with constant load. With chemical mechanical micro machining the surface crack and burrs generated by both brittle and ductile micro machining were diminished. And the surface profile and groove depth was shown in accordance with the machining speed and reaction time with SEM and AFM.
A Study on the Effect of Pattern Density and it`s Modeling for ILD CMP
Hong, Gi-Sik ; Kim, Hyung-Jae ; Jeong, Hae-Do ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 196~203
Generally, non-uniformity and removal rate are important factors on measurements of both wafer and die scale. In this study, we verify the effects of the pressure and relative velocity on the results of the chemical mechanical polishing and the effect of pattern density on inter layer dielectric chemical mechanical polishing of patterned wafer. We suggest an appropriate modeling equation, transformed from Preston\`s equations which was used in glass polishing, and simulate the removal rate of patterned wafer in chemical mechanical polishing. Results indicate that the pressure and relative velocity are dominant factors for the chemical mechanical polishing and pattern density effects on removal rate of pattern wafers in die scale. The modeling is well agreed to middle and low density structures of the die. Actually, the die used in Fab. was designed to have an appropriate density, therefore the modeling will be suitable for estimating the results of ILD CMP.
Stress Analysis of Gas-Gas Heater in Thermal Power Plant
Hwang, Suk-Hwan ; Choi, Jae-Seung ; Lee, Hoo-Gwang ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 204~211
Today\`s industrialized plants are required to reduce SOx emitted from stacks at factories, utility power stations, etc. For this purpose, flue gas desulfurization(FGD) system is installed in thermal power plant and gas-gas heater(GGH) is used to play a vital role to reheat the wet treated gas from FGD. The sector plates are located at cold and hot sides of gas-gas heater. They serve as sealing to prevent mixing treated and untreated gases. Therefore, the deformation of the sector plate due to its dead weight and gas pressure should be considered as major factor for the sector plate design. And finite element analysis(FEA) for rotor part in GGH is performed with original model and two weight-reduced models with different diaphragm thickness, respectively. Stress concentrations at rotor diaphragm happen due to the dead weight, pressure difference between treated and untreated gas, and thermal distribution in the rotor. As the thickness of diaphragm is decreased, the stress level is increased. The direction of treated gas and untreated gas flow may affect the stress level.
Development of a Distributed Flexible Tactile Sensor System
Yu, Gi-Ho ; Yun, Myeong-Jo ; Jeong, Gu-Yeong ; Gwon, Dae-Gyu ; Lee, Seong-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 212~218
This research is the development of a distributed tactile sensor using PVDF film far the detection of the contact state. The prototype of the tactile sensor with 8
8 taxels was fabricated using PVDF film and flexible circuitry. In the fabrication procedure, the electrode and the common electrode patterns are attached to the both side of the 28
thickness PVDF film. The sensor is covered with polyester film for insulation. The signals of a contact pressure to the tactile sensor are sensed and processed in the DSP system in which the signals are digitalized and filtered. And the signals are integrated for taking the force profile. The processed signals of the output of the sensor are visualized to take the shape and force distribution of the contact object in personal computer. The usefulness of the sensor system is verified through the sensing examples.
Mechanical Etching of Micro Pocket by Powder Blasting
Park, Kyoung-Ho ; Oh, Young-Tak ; Park, Dong-Sam ;
Journal of the Korean Society for Precision Engineering, volume 19, issue 1, 2002, Pages 219~226
The mechanical etching technique has recently been developed to a powder blasting technique for various materials, capable of producing micro structures larger than 100
m. This paper describes the performance of powder blasting technique in micro-pocketing of stainless steel and the effect of the number of nozzle scanning and the nozzle height on the depth and width of pockets. Experimental results showed that increasing the no. of nozzle scanning and decreasing the nozzle height resulted in the increase of depth and width in pockets. Increase of width results from wear of mask film.