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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
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Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 14, Issue 12 - Dec 1997
Volume 14, Issue 11 - Nov 1997
Volume 14, Issue 10 - Oct 1997
Volume 14, Issue 9 - Sep 1997
Volume 14, Issue 8 - Aug 1997
Volume 14, Issue 7 - Jul 1997
Volume 14, Issue 6 - Jun 1997
Volume 14, Issue 5 - May 1997
Volume 14, Issue 4 - Apr 1997
Volume 14, Issue 3 - Mar 1997
Volume 14, Issue 2 - Feb 1997
Volume 14, Issue 1 - Jan 1997
Selecting the target year
항공기 부품, 무엇이 문제인가\ulcorner
C.H. Sang ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 15~16
일본 국제 공작기계 전시회(JIMTOF)를 다녀와서
C.H. Kahng ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 17~28
Assemblability and disassemblability of mechanical parts in automobile
H.S. Mok ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 23~32
In this paper, systematic approach is studied about assemblability and disassemblability of parts in order to reduce the assembly cost, and to disassemble products easily which is possible to recycle the parts. For this purpose, we selected one subassembly, and analysed assembly and disassembly process. From this result, we found the weakpoints of assembly and disassembly process, and then, the influencing parameters of assemblability and disassemblability are defined. On the basis of the analysis of these parameters we grasped the interrelation between assemblability and disassemblability. And, guidelines for assemblability and disassemblability are developed. Finally design alternatives are evaluated quantitatively in the aspects of assembly and disassembly by using the guidelines which developed in this research.
K.J. Stout ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 29~51
The purpose of the survey is to identify possible new areas of research relating to nanotechnology and in particular areas in which the established facilities of the Centre for Metrology can be employed to good effect. This survey indicates that nanotechnology, a sub set of the more embracing Nano Science, is a rapidly developing discipline with good potential for Electronic and Mechanical Engineering. Nanotechnology includes three areas: Nanometrology, Nanometer positioning and Control, and Nanomanufacturing. In each of the areas, the current research situation and developing trends have been summarised. Possibilities for future work indicated.
A Study on Kinematic Evaluation of Hydraulic Schovel Arms by Using a Manipulability Measure
Kang, S.D. ; Hara M. Huh ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 52~57
The paper deals with kinematic evaluation of performance of a hydraulic shovel arm for deburrinhg task. First, a new criteria for evaluation is derived to evaluate accuracy of an ene-effector at each position with- in the movable area of the hydraulic shovel arm. Secondly a graphic evaluation system that displays a map of the criteria for evaluation and a map of the manupulability measure is build. Thirdly, by using by using the sas- tem, a hydraulic shovel arm is kinematically evaluated. Finally, from the comparison of the result obtained from the computer simulation and an experimental result, it is indicated that the derived criteria for evalu- ation and the graphic system are useful.
The Development of the Drawing Information Management System Based on Group Technology
H.S. Moon ; Kim, S.H. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 58~68
In order to provide economic high-quality products to customers in a timely manner, companies have tried much effort to decrease the time period of engineering design and information management. As a part of this effort, we have developed the Drawing Information Management System(DIMS) based ofn GT(Group Technology) that could decrease design processing time by speedy and rational management of design processes. The characteristics of DIMS are as follows: First, the concept of Concurrent Engineering was applied to DIMS. Through LAN, reviewers are able to attach comments to dlectronic documents by anno- tation functions called Mark-up. The reviewer annotations are collected and combind with the original document to revise the documents. Second, we have developed a Classification and Coding(C&C) system suitable for electronic component parts bassed on GT(Group Technology). The C&C system makes both parts and drawing with similar characteriscs into families and helps users search existing documents or create new drawings promptly. Finally, DIMS provides the Engineering BOM(Bill of Material) using the concept of Family BOM based on model options.
Development and Verication of a Robot Off-line Programming System for Die Polishing Process
S.C. Kang ; Kim, M.S. ; Lee, K.I. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 69~77
An Experimental Analysis on the Stewart Platform-Based 6 Axis Force-Torque Sensor
J.H. Han ; C.G. Kang ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 78~83
The paper presents the experimental analysis of a Stewart platform-based force-torque senor. The closed-form solution of forward kinematics of the Stewart platform is derived approximately by way of a linearization technique, and the solution is used in the force analysis of the force-torque sensor. An exper- mental studies show that the proposed method including gravity compensation algorithm is valid for Stew- art platform-based force-torque sensors. The performance of the developed force-torque sensor is evaluated in view of accuracy and linearity in measurements.
A Study on Collection Efficiency of Compact and Small Size Air-Cleaning Electrostatic Precipitator
Lee, S.H. ; Yum, M.O. ; Kang, K.O. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 84~89
Recentely, a compact and small size air-cleaning Electrostatic Precipitator(ESP) is needed to develop for air conditioning devices. From Deutsch formula for ESP efficiency, collection efficiency is affected not only the structure of collection section but also the charge rate of dust. In terms of collection area, the most useful type is a scroll type ESP. In this work, we investigated experimentally aptimum design factor of scroll type ESP by application of Taguchi method. And we developed the scroll type ESP by using optimal condition of control factor.
Transmission Error Analyis of Spur Gear Trains with Tolerances
H.S. Han ; Kim, T.Y. ; Park, T.W. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 90~100
Sppur gear trains are used widely in high precision machines because gear trains have an advantage of exact transmission of angular velocity. Especially, gear trains are used in high quali8ty photocopying and photography OA machines. In general, gears have errors in manufacturing and assembling process and the errors are limited by tolerances. As the result, the tolerances cause the performance error. Therfore, it is important to predict transmission error caused by the tolerances for the tolerance design. Earlier tolerance design methods use mainly experimental and geometrical techniques. In this paper, a method for gear train analysis with tolerance is proposed. Because the method uses dynamic contacts, it is possible to consider irregularities and assemble errors of gears. In addition, the method can predit dynamic loads on the teeth of gears.
Automatic Determination of Coagulant Dosing Rate Using Fuzzy Neural Network
W.S. Chung ; S.Y. Oh ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 101~107
Recently, as the raw water quality becomes to be polluted and the seasonal and local variation of water quality becomes to be severe, an exact control of coagulant dosing have been required in the water treat- ment plant. The amounts of coagulant is related to the raw water quality such as turbidity, alkalinity, water temperature, pH and edectrical conductivity. However the process of chemical reaction has not been clarified so far, so the dosing rate has been decided by jar-test, which is taken one or two hours. For the sake of this coagulant dosing control, fuzzy neural network to fuse fuzzy logic and neural network was proposed, and the scheme was applied to automatic determination of coagulant dosing rate. This controller can automatically identify the if-then rules and tune the membership functions by utilizing expert's cintrol data. It is shown that determination of coagulant dosing rate according to real time sensing of water quality is very effect.
Development of Heterarchical Control System through Automated Plant Monitoring
Lee, S.H. ; Y.H. Bae ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 108~118
The heterarchical structure provides a more attractive solution to the conventional hierarchical structure as the density and level of distrubution of computing resources in manufacturing system expands. Tracing the evolution of control structures for automated manufacturing systems, this paper discusses the design principles for heterarchical system to reduce complexity, increase extendability, flexible configurability and suggests a good example of real-time adaptation using the concept of intelligent agent of manufac- turing entities and fault diagmosis system.
Vibration Control of a Smart Cantilevered Beam Using Electro-Rheological Fluids and Piezoelectric Films Actuators
Park, Y.K. ; Park, S.B. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 119~125
This paper deals with an experimental investigation on an active vibration control of ahybrid smart structure(HSS) via an electro-rheological fluid actuator(ERFA) and a piezoelectric film actuator(PFA). Firstly, an HSS is constructed by inserting a silicone oil-based electro-rheological fluid into a hollow can- tilevered beam and perfectly bonding piezoelectric films ofn the upper and lower surfaces of the beam as an actuator and a sensor, respectively. The control scheme of the ERFA tuning stiffness and damping charac- teristics of the HSS with imposed electric fields is formulated as a function of excitation frequencies on the basis of field-dependent respnses. On the other hand, as for the control scheme of the PFA permitting control voltages to generate axial forces or bending moments for suppressing deflections of the HSS, a neuro sliding mode controller(NSC) is employed. Furthermore, an experimental implementation activating the ERFA and the PFA independently is established to carry out an active vibration control in both the transient and forced vibrations. The experimental results exhibit a superior ability of the gtbrid actuation system to tailor elastodynamic response characteristics of the HSS rather than a single class of actuator system alone.
Finite Element Analysis of Solidification Processes of Axisymmetric Castings Considering Phase Change and Contact
Ghoo, B.Y. ; Keum, Y.T. ; Lee, J.K. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 126~141
The purpose of this research is to develope a FEM program for analyzing solidification processes of axisymmetric casting, considering phase changes and the contact between the metal and mold. Tempera- ture recovery method is employed fro considering the phase changes releasing the latent heat and the coin- cident node method is used for calculating the amount of heat transfer between the metal and mold. Tan- gent modulus algorithm is adopted for calculating flow stress and a gap element is employed for modeling the interface between the mold and metal in finding deformed shapes. In order to verify the developed program, axisymmetric aluminum and steel casting processes are simulated. Temperature distribution, phase front position, and shrinkage and porosity creation are compared with measurements, FIDAP results, and good agreements are examined.
Laser Engraving of Plasma Sprayed Ceramic Coatings
S.Y. Bang ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 142~149
Ceramic-coated anilox roll for printing is resistant to corrosion and wear, and hence has enhanced life and quality. Laser engraving is used typically for machining holes to store ink in this roll. Since engraved hole size and shape are directly related to laser processing parameters, it is necessary to know the rela- tionships among these parameters. In this study, the parameters for engraving of ;oasma sprayed ceramic coatings with Nd:YAG laser were studied. Relationships between hole shape and processing parameters were analyzed. Cr
ceramic was found to be most suitable for Nd:YAG laser engraving. It was found that hole depth can be increased by using higher energy pulses. Effect of using different assistant gases was small to the final results. For better results, it was suggested to use a very stable laser with shorter pulses and higher pulse energy.
A Study of Fuzzy Control of Weld Pool Width in Gas Tungsten Arc Welding
H.K. Chung ; S.H. Rhee ; K.W. Um ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 150~157
Uniform weld pool shape is important in determining the weld quality. And weld pool width is one of the most dominant factors of the seld pool shape. In order to control the weld pool width, the fuzzy logic controller, which is well adapted to the complicated nonlinear systems such as welding, was used in this study. The weld pool image was obtained through CCD camera, and the weld pool width was calculated by processing the image. Uaing the calculated width, welding speed, as a control input, was inferred by the fuzzy logic controller. An uniform weld pool width can be successfully obtained regardless of the disturbances in the system.
A Collision Avoidance Algorithm of a Mobile Robot in the Presence of Moving Obstacle
Kim, S.W. ; D.G. Gweon ; Y.Y. Cha ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 158~167
For the use of a mobile robot in dynamic environment, a collision-avoidance algorithm with moving obsta- cle is necessary. In this paper, a collsion-avoidance algorithm of a mobile robot is presented, when a mobile robot detects the collision with moving obstacle on the navigational path. Using reported positions of moving obstacle with sensors, the mobile robot predicts the next position of moving obstacle with possibility of collision. The velocity of moving obstacle is modeled as random walk process with Gaussian distribution. The optimal collision-avoidance path in which turning motion of the mobile robot is considered is generated with relative velocity between the mobile robot and moving obstacle. For the safety of collision-avoidance path, attractive potential with the safety factor is suggested. The simulation results using this algorithm show the mobile robot avoids collision with moving obstacle in many cases.
Generation of Alternative Process Plan by Net Model
Park, J.H. ; Park, M.W. ; M.H. Kang ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 168~173
A process planning system that generates alternative process plans offers multiple process plans for a part, thereby provides the flexibility to cope with the changes in shop floor status. In this paper, we intro- duce the concept of process net as a model for the generation of alternative process plans. We also show the usefulness of process net model in generating alternative process plans by implementing the developed sys- tem to construct process net, and devising an algorithm to generate alternative process plans for rotational parts.
Force Tracking Control of a Smart Flexible Gripper Featuring Piezoceramic Actuators
Park, S.B. ; C.C. Cheong ; Lee, C.H. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 174~184
This paper presents a robust force tracking control of a smart flexible gripper featured by a piezoceramic actuator characterizing its durability and quick response time. A mathematical governing equation for the proposed gripper structure is derived by employing Hamilton's principle and a state space control model is subsequently obtained through model analysis. Uncertain system parameters such as frequency variation are included in the control model. A sliding mode control theory which has inherent robustness to the sys- tem uncertainties is adopted to design a force tracking controller for the piezoceramic actuator. Using out- put information from the tip force sensor, a full-order observer is constructed to estimate state variables of the system. Force tracking performances for desired trajectories represented by sinusoidal and step func- tions are evaluated by undertaking both simulation and experimental works. In addition, in order to illustrate practical feasibility of the proposed method, a two-fingered gripper is constructed and its performance is demonstrated by showing a capability of holding an object.
A Study of the on-Line Surface Roughness Monitoring using the Cutting Force in Face Milling Operation
D.K. Baek ; T.J. Ko ; Kim, H.S. ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 185~193
This paper presents the on-line monitoring of the surface roughness in a face milling operation. The cut- ting force was used to monitor the surface roughness, since the insert run-outs not only deteriorate surface roughness but also change cutting force. AR model and band energy method were taken to extract the fea- tures from the cutting force. The features extracted from AR modelling are more accurate about the moni- toring than those from band energy method, whereas, the computing speed of the former is slow. An artifi- cal neural network discriminated the level of the surface roughness by using the features extracted via signal processing.
Rational approximation of multiple input delay systems
I.C. Hwang ; K.T. Park ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 194~204
In this paper, we consider the rational approximation of multiple input delay systems. The method of computing Hankel singular values and vectors is firstly introduced, where explicitly shows the structure of the corresponding Hankel singular vectors. Secondly, rational approximants are obtained from output nor- mal relizations, which are constructed by Hankel singular values and vectors. As a result, it is shown that rational approximants by output normal realization preserve intrinsic properties of time delay systems than Pad'e approximants.
Effects of chassis flexibility and engine vibration in ride quality
D.K. Kang ; W.S. Yoo ;
Journal of the Korean Society for Precision Engineering, volume 14, issue 1, 1997, Pages 205~213
In this study, dynamic analysis of a passenger car is carried out to analyze ride quality over a random road profile. The front suspension of the car is a MacPherson strut type and the rear suspension is a multi- link type. The following five different models are constructed and compared to see the effects of engine vibration and chassis flexibility in the ride quality. (1) one rigid chassis model, (2) a rigid chassis and rigid engine model, (3) a rigid engine and flexible chassis model with one vibration mode, (4) one flexible chassis model with six engine vibration modes and one chassis vibration mode, (5) one flexible chassis model with seven vibration modes and four static correction modes. The result shows that engine vibration modes and the first bending mode of the chassis are important in the ride quality.