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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
Technology Trends for High Recording Density in HDD
Park, Young-Pil ; Yang, Hyun-Seok ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 9~18
Mechanical Vibration of Rotating Disks in Information Storage Devices Disks
Lee, Seung-Yop ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 19~24
Technical Trend of Optical Information Storage Device
Song, Tae-Sun ; Lee, Moon-Do ; Jun, Hong-Gul ; Park, No-Cheol ; Park, Young-Phil ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 25~36
Recent Trend and Technical Issues in Ultrahigh Density Optical Data Recording
Kim, Sookyung ; Kim, Jin-Hong ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 37~45
Development Trend of Optical Data Storage Media and Design and Fabrication of High Density optical Disk Substrate
Kim, Dong-Mook ; Kang, Shin-Ill ; Rhim, Yoon-Chul ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 46~54
Technology of data storage device has developed noticeably as demands and needs of new media increase, Huge data can be conveniently handled using removable type optical disk. In the present paper, the trend and current issue of development for optical disk media are introduced. Standardization of next generation optical disk media, technology of recording and reading, and applications of magneto-optical devices are also discussed. Finally, a methodology of process optimization for design and fabrication of high density optical disk substrate is proposed.
A study on the Product Function Deployment Method
Lee, Eon-Gyeong ; Park, Seon-Ju ; Gang, Dal-Mo ; Ha, Seong-Do ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 55~63
This paper describes a methodology of product function deployment for understanding product functions and generating systematic functional relation charts. The product function deployment is based on the designer's understanding of product functions. The method involves following steps: 1) definition of product primary function and flows of energy, material, and information, 2) construction of a product tree using key parts, 3) definition of functions and interactions of the functional units, 4) construction of 'from-to' relation matrices, 5) grouping of the parts, and 6) construction of functional relation charts. With this approach, functional relation charts can be generated such that complex product functions are easily understood. The functional relation chart of a refrigerator is generated as an example.
Stick-slip Friction Modeling and Performance Comparison of a Precise Linear Actuator
Kim, Sang-Chae ; Kim, Soo-Hyun ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 64~71
In general, precise linear actuators using piezoelectric element are driven by friction force. Exact understanding of friction plays an important role in analysis and control of a motor. In this research, we designed a precise linear actuator using piezoelectric elements and observed its dynamic characteristics. By varying phase angle difference and amplitudes of the sinusoidal waves that are driving inputs, we can know that it is possible to control moving direction and distance of the slider. As preload is increased, its moving distance is decreased. And also, we have modeled a precise linear actuator using stick slip friction models such as classical, Karnopp. and reset integrator. Finally, by comparing the results of simulation and experiment, it was verified that the model is well designed.
Monitoring of Chatter Vibration using Neural Network in Turning Operation
Nam, Yong-Seak ; Cho, Jong-Rae ; Kim, Chae-Sil ; Jung, Youn-Gyo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 72~77
Monitoring of the chatter vibration is necessarily required to do automatic manufacturing system. Therefore, we constructed a sensing system using tool dynamometer in order to monitor of chatter vibration on cutting process. Furthemore, an application of neural network using behavior of principal cutting force signals Is attempted. With the error back propagation trining process, the neural network memorized and classified the feature of principal cutting force signals. From obtained result, it is shown that the chatter vibration can be monitored effectively by neural network.
A Study on the Heat-treatment Technique for Deformation Control of SM45C steel
Ryu, Seong-Gi ; Nam, Tae-Hyeon ; Park, Jun-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 78~84
This study deals with the heat-treatment technique of SM45C steel with respect to less of deformation in control. The whole process for the production of landing gear must go through with uniformally controlled heat treatment, where as most deformation usually occur in nonuniform cooling environment. When a heated metal is submerged into a certain quenchant, the rate of cooling rapidity can be measured rather slow during the early stage of the procedure due to an Occurrence of a vapor blanked. As the additional course of cooling action is applied and the vapor from a vapor blanked is destroyed simultaneously, the speed of cooling promptness can be considered rather swift. The object of this study is to control the certain deformations as in the procedure of a heat treatment for landing gear by analyzing and improving the conditions of different substance of quenching liquids. Several noticeable curves indicating the temperature variation on the ap-plied metals during the cooling procedures, along with detectable rates of water verses oil and that of different polymer solutions are illustrated.
Analysis of the Weak Manual Assembly Process with Part Coding System
Mok, Hak-Soo ; Moon, Kwang-Sup ; Park, Hong-Seok ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 85~96
In this paper, part features are classified and then its coding system is constructed by the considered characteristics of features in assemble process. Analyzing the characteristics of features, code values about part features are determined. Assembly process is divided into five functions such as transporting, handing, approaching, alignment and joining, and then the detail parameters of each functions such as determined. Code values about assembly process are determined according to detail parameters. The detail parameters are kinds of available working method and assembly tools when each assembly function is going on. By the coding system, available assembly process can be grasped and perceived for the part that it is difficult to assemble.
Compensation of Geometric Error by the Correction of Control Surface
Ko, Tae-Jo ; Park, Sang-Shin ; Kim, Hee-Sool ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 97~103
Accuracy of a machined part is determined by the relative motion between the cutting tool and the workpiece. One of the important factors which affects the relative motion is the geometric errors of a machine tool. In this study, firstly, geometric errors are measured by laser interferometer, and the positioning error of each control point selected uniformly on the control surface CAD model can be estimated from th oirm shaping model and geometric error data base. Where a form shaping function is derived from the link of homogeneous transformation matrix. Secondly, control points are shifted to the estimated amount of positioning errors. A new control surface is modeled with NURBS(Non Uniform Rational B-Spline) surface approximation to the shifted control points. By generating tool paths to the redesigned control surface, we reduce the machining error quite.
The Toolpath Generation for Free-Formed Surface with the Flat Endmill
Lee, Gun-Young ; Nam, Won-Woo ; Lee, Sang-Jo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 104~111
The toolpath generation for 3D shaped parts with adaptive isocurve is more precise than existing methods, and the machining time can be reduced. Whether adaptive isocurves are inserted or not is determined by the surface shape, but the number of curves inserted and the total path length vary with initial step lengths. In this paper, therefore, by introducing the concept of the scale factor into the initial path interval ; toolpath was regenerated.
A study on Elevator Group Controller of High Building using Adaptive Dual Fuzzy Algorithm
Choi, Seung-Min ; Kim, Hum-Mo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 112~120
In this paper, the development of a new group controller for high-speed elevator is carried out utilizing the approach of an adaptive dual fuzzy logic. Some goals of control are the minimization of waiting time, mean-waiting time and long-waiting time in a high building, when a new hall call is generated, adaptive dual fuzzy controller evaluate traffic pattern and change appropriately the membership function of a fuzzy rule base. Controls for co-operation among elevators in a group control algorithm arte essential, and the most critical control function in the group controller is an effective and proper hall call assignment of elevators. The group elevator system utilizing adaptive dual fuzzy control reveals a great deal of improvement on its performance.
Formability of Non-Vinyl Pre-coated Metal Sheet
Kim, Dong-Hwan ; Kim, Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 121~128
This study has been performed to investigate formability of non-vinyl PCM(pre-coated metal)sheet. First, physical test of PCM sheets were tested to evaluate finish coating characteristic of PCM. And then, test equipment was made for friction test and three non-vinyl PCM sheets were tested by straight pulling method. This paper provides the results of the friction tests showing the influence of sheet surface texture and process conditions. It was found that the influence of contact pressure and speed had an effect upon the level of friction. Also using tests, the scratch resistance of a series of polyester coating has been investigated. This investigation aims to clarify the process conditions that prevent the scratch of PCM to form the good electrical appliances such as microwave oven, air conditioner and refrigerator etc.
A Study on the Simulation of Welding Deformation for accurate Assembling
Sung, Ki-Chan ; Jang, Kyung-Bok ; Jung, Jin-Woo ; Kang, Sung-Soo ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 129~134
It is essential to predict the welding deformation at assembly stage, to increase productivity through mechanization and automation effectively. A practical analysis method appled for production engineering was proposed to simulate the deformation of arc welding, with an analytical model using finite element method solving thermal-elastic-plastic behavior. In this research, for accurate assembling, 3-D thermal-elastic-plastic finite element model is used to simulate the out-of-plane deformation caused by arc welding. Efforts have been made to find out the efficient method to improve the reliability and accuracy of the numerical calculation. Each of theories of small and large deformation is applied in solving 3-D thermal-elastic-plastic problem to compare with their efficiency about calculation imes and solution accuracy. When solid elements are used in a bending problem of a plate, phenomenon that the predictive deformation is more than that of actual survey is observed. To prevent this phenomenon, reduced integration method for element is employed instead of full integration that is generally used in 3-D thermal-elastic-plastic analysis.
The Effect of Processing Parameters to Manufacture Self-healing Microcapsules for Composite Materials
Yoon, YoungKi ; Yoon, HiSeak ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 135~141
An experimental study to find the effect of processing parameters for self-healing microcapules is performed. These microcapsules can be applied to accomplish the healing of delamination damage in woven E-glass/epoxy composites. This paper introduces the self-healing concept and presents a method for solving the microcapsule size and shape. Additionally, processing parameters are varied during the formation of microcapsules and these capsules are observed through optical microscope. To obtain thermogravimetric(TG) curve for the manufactured microcapsules, TGA tests are executed. From these results, the best processing conditions for the formation of capsules are found as follows: (1) temperature of solution
, (2) potential of hytdrogen(pH) 3.5ppm, and (3) agitation 500~600rpm.
Evaluation of Mechanical Properties of Welded Metal in Tailored Steel Sheet Welded by
Ghoo, Bon-Young ; Keum, Young-Tag ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 142~150
Automotive manufactures have taken more interests in tailored sheet metals for improving the rigidity, weight reduction, crash durability, and cost savings so that their application to auto-bodies has been increased. However, since the tailored sheet metals do not behave like un-welded sheet metals in press forming operations, the stamping engineers no longer rely only on conventional forming techniques. Futhermore, there is no clear understanding of the characteristics of welded metal which influence the overall press formability of tailored sheet metals. Recently, the computer simulations are prevailing for the evaluation of the formability. Unfortunately, the mechanical property of tailored sheet metal has to be quantitatively defined in the simulation. In this study, the analytical equations are formulated in order to find the mechanical properties of the welded metal in the tailored sheet metal welded by co
laser. Based on force distribution assumption, the constitutive behavior of the welded metal is investigated using uniaxial tensile test results of base metals and tailored sheet metal. Then, the strength coefficient, work-hardening exponent, and plastic strain ratio of laser-welded metal are calculate from those of base metals and tailored sheet metal. In addition, the existence of weld defects in the welded metal is indirectly detected by examining the slop of strength coefficient of the welded metal.
A study on the Evaluation of Material Degradation of 1Cr-1Mo-0.25V Steel using Ball Indentation Method
Seok, Chang-Sung ; Kim, Jeong-Pyo ; Ahn, Ha-Neul ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 151~159
As huge energy transfer systems like a nuclear power plant, steam power plant and petrochemical plant are operated for a long time, mechanical properties are changed by degradation. The life time of the systems can be affected by the mechanical properties. BI(Ball Indentation) test has a potential to replace conventional fracture tests like a uniaxial tensile test, fracture toughness test, hardness test and so on. In this paper, we would like to present the ageing evaluation technique by the BI method. The four classes of the thermally aged 1Cr-!mo-0.25V specimens were prepared using an artificially accelerated aging method. Tensile tests, fracture toughness tests, hardness tests and BI tests were performed. The results of the BI tests were in good agreement with fracture characteristics by a standard fracture test method within 5%. The IDE(Indentation Deformation Energy) of a BI technique as a new parameter for evaluating a degradation was suggested and the new IDE parameter clearly depicts the degradation degree.
Reliability Assessment of Buried Pipelines with a Circumferential Surface Elliptical Crack under Axial Stress
Lee, Eok-Seop ; Hwang, In-Hyeon ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 160~166
The theoretical analyses for stresses induced in axial direction in the buried pipelines are reviewed. The influences of the axially directed stresses on the surface elliptical crack are studied in detail and thus some engineering technical informations are provided to use reliability assessment of buried pipelines. The change in temperature, the effect of inner pressure and soil friction in the buried pipeline constrained in axial direction are included to determine the axial stresses in the buried pipeline. Furthermore, the stress induced by the pipeline bending are also considered. The stress intensity factors calculated by two models such as a simple plane crack and an elliptical surface crack for a circumferential surface elliptical crack are compared.
Enhancement of Roll Stability by Speed-Adaptive Robust Control
Kim, Hyo-Jun ; Park, Yeong-Pil ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 167~175
This paper presents design of active roll controller of a vehicle and experimental study using the electric actuating roll control system. Firstly, parameter sensitivity analysis is performed based on 3DOF linear vehicle model. The controller is designed in the frame work of gain-scheduled H
control scheme considering the varying parameters induced by laden and running vehicle condition. In order to investigate a feasibility of an active control system, experimental work is performed using hardware-in-the -loop setup which has been constructed by the devised electric actuating system and the full vehicle model with tire characteristics. The performance is evaluated by experiment using hardware-in-the -loop simulation under the conditions of some steer maneuvers and parameter variations.
Method for Shop Floor Control Using Agent-Technique
Park, Hong-Seok ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 176~181
Due to the increasing complexity to handle conflicts and interruptions caused by resource failures and rush orders, shop control is obliged to redesign its organization according to the changing demands of the manufacturing control. These demands are leading to the development of decentralization and gradually to their permanent optimization. As a result, a powerful modeling method which can be adapted efficiently is required. The use of agent theory enables specific modeling of the relevant shop planning activities. The planning activities are modeled in a so-called activity modeling through the definition of three classes of agents; Plan Agent, Manufacturing System Agent and Control Agent as well as the description of the cooperative relationship among these agents. On the basis of the activity model the agent-based shop control method is developed which emphasizes the distributed problem-solving and the cooperation with relevant agents.
Cutting Performance of Submicron Cermet Tools and Their Mechanical Properties
Ahn, Dong-Gil ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 182~189
TiCN based submicron cermet and similar ISO grad of the conventional cermets with TiCN of different particle size were produced by PM process, and their microstructure, mechanical properties and cutting performance were compared. The microstructure of submicron cermet was more homogeneous and showed much finer microstructure, resulting in better hardness and fracture toughness. The submicron cermet tools achieved excellent cutting performance such as wear resistance and toughness in comparison with two grades of the conventional cermets in millimg test. The relationship between microstrucure, mechanical properties and cutting performance of these cermet tools was discussed. The submicron cermet tools revealed for their potential to wide application range and interrupt cutting because of their superior wear resistance and toughness combinations.
A Precision Position Control of Antenna Driving System in Naval Vessel
Cho, Taik-Dong ; Seo, Song-Ho ; Nam, Ki-Jung ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 190~196
The naval vessel must moves rolling, pitching, yawing by wave when it runs in ocean. Some narrow beam antenna needed position compensation by stabilizer or gimbal for best performance. This paper presents the precision position control for heavy weight(130kg) in roll and pitch direction. Generally it's called for gimbal. This gimbal uses P-I controller, and it's driven by linear actuator and servo motor. This gimbal gets ship's gyro signal and synchro, which have the absolute angle value. Some other similar equipments are driven by huge hydraulic power, but this gimbal is driven by small servo motor. This control loop gets the following procedure repeatedly; reading ship gyro and gimbal synchro, calculating compensated error and control output, driving motor and actuator The performance of gimbal system was satisfied.
Evaluation Methodology Development of Disassembly Through Axiomatic Design
Kim, Young-Kyu ; Cho, Kyu-kab ; Moon, Yong-rak ; Cha, Sung-Woon ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 197~202
This paper proposes a design method for improving the disassembly by using the axiomatic approach. A product developer must design disassembly as well as assembly when designing the structure of a product. Axiomatic approach is a design tool that optimizes design. In this paper design evaluation method using information axiom sets impact variables and value function. As a result, examining the relationship between the functional requirements and evaluating the information can optimize designs.
Vibration Control of the Rotation Position Mechanism with Dual Actuator for High Precision Control
Lee, Yong-Gwon ; Jo, Won-Ik ; Yang, Hyeon-Seok ; Park, Yeong-Pil ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 203~208
In this paper, a novel dual-type positioning mechanism using a voice coil motor(VCM) and a piezoelectric actuator is proposed for optical disk drive or near-field recording type drive. The VCM is used for a coarse motion actuator and the piezoelectric actuator, "S" configuration deflection motion when voltage applied, is used for a fine motion actuator with self-sensing technique, which allows it to sense and actuate simultaneously in a closed loop frame work. When the VCM rotates and stops, a position feedback control algorithm is adopted to further control residu vibration. The performance of the control scheme is confirmed through simulations and experiments.
Fuzzy Inference System Based Multiple Neural Network Controllers for Position Control of Ultrasonic Motor
Choi, Jae-Weon ; Min, Byung-Woo ; Park, Un-Sik ;
Journal of the Korean Society for Precision Engineering, volume 18, issue 4, 2001, Pages 209~218
Ultrasonic motors are newly developed motors which are expected to be useful as actuators in many practical systems such as robot arms or manipulators because of several advantages against the electromagnetic motors. However, the precise control of the ultrasonic motor is generally difficult due to the absence of appropriate and rigorous mathematical model. Furthermore, owing to heavy nonlinearity, the position control of a pendulum system driven by the ultrasonic motor has a problem that control method using multiple neural network controllers based on a fuzzy inference system that can determine the initial position of the pendulum in the beginning of control operation. In addition, and appropriate neural network controller that has been learned to operate well at the corresponding initial position is adopted by switching schemes. The effectiveness of the proposed method was verified and evaluated from real experiments.