Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
Editor in Chief :
Volume & Issues
Volume 20, Issue 12 - Dec 2003
Volume 20, Issue 11 - Nov 2003
Volume 20, Issue 10 - Oct 2003
Volume 20, Issue 9 - Sep 2003
Volume 20, Issue 8 - Aug 2003
Volume 20, Issue 7 - Jul 2003
Volume 20, Issue 6 - Jun 2003
Volume 20, Issue 5 - May 2003
Volume 20, Issue 4 - Apr 2003
Volume 20, Issue 3 - Mar 2003
Volume 20, Issue 2 - Feb 2003
Volume 20, Issue 1 - Jan 2003
Selecting the target year
Nanoprobe Application Technologies
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 5~14
Trend of Nanoimprint Lithography Technology
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 15~22
Nanoparticles and It's Applications in Micromachining
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 23~28
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 29~34
Development of Optimal Layout Design System in Multihole Blanking Process
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 35~41
The multihole blanking of thin sheet metal using progressive die set is an important process on production of precision electronic machine parts such as IC leadframe. In this paper, in order to investigate the influence of blanking order on the final lead profile and deformed configuration, simulation technique for progressive blanking process is proposed and analyzed by LS-DYNA. The results of FE-simulations are in good agreement with the experimental results. Consequently, from the results of FE-analysis based on the procedure proposed in this paper, it is possible to predict the deformation of lead and to manufacture high precision leadframes in progressive blanking process and these results might be used as a guideline to develop layout design system in multihole blanking process.
A Study on the Distribution of Friction Heat generated by CMP Process
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 42~49
In this paper, we provide the results of polishing temperature distribution by way of infrared ray measurement system as well as polishing resistance, which can be interpreted as tribological aspects of CMP, using force measurement system. The results include the trend of polishing temperature, its distribution profile and temperature change during polishing. The results indicate that temperature affects greatly to the removal rate. Polishing temperature increases gradually and reaches steady state temperature and the period of temperature change occurs first tens of seconds. Furthermore, the friction force also varies as the same pattern with polishing temperature from high friction to low. These results suggest that the first period of the whole polishing time greatly affects the nonuniformity of removal rate.
Optimal Design for Weight Reduction of Magnet Over Head Crane by using Taguchi method
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 50~57
In this study, the structural optimal design was applied to the girder of over head crane. The optimization was carried out using ANSYS code fur the deadweight of girder, especially focused on the thickness of its upper, lower, reinforced and side plates. The weight could be reduced up to around 15% with constraints of its deformation, stress and buckling strength. The structural safety was also verified by the buckling analysis of its panel structure. It might be thought to be very useful to design the conventional structures fur the weight save through the structural optimization. The objective function and restricted function were estimated by the orthogonal array, and the sensitivity analysis of design variable fur that was operated.
Estimation of the Absolute Vehicle Speed using the Fifth Wheel
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 58~65
Vehicle acceleration data from an accelerometer and wheel speed data from standard, 50-tooth antilock braking system wheel speed sensors are used to estimate the absolute longitudinal speed of a vehicle. We develop the four velocity estimation algorithms. And we compare experimental results with the Butterworth filtered speed from the fifth wheel and find that it is possible to estimate absolute longitudinal vehicle speed during a hard braking maneuver lasting three seconds.
Position-Synchronous Control of a Rotating System by Adding Disturbance Observer to Coupling Structure
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 66~73
In this study, a methodology of synchronous control which can be applied to position synchronization of a two-axis rotating system is developed. Based on coupling structure, the synchronous control system is composed of disturbance observer, speed and synchronous controllers. The speed controller is designed to follows speed reference. The disturbance observer is designed to restrain synchronous error. In addition, the synchronous controller is designed for a viewpoint of accurate synchronization in lead compensation law. The effectiveness of the proposed method is verified through simulation.
The Optimization of Main and Sub Spindle's Synchronous Control in Turning Center
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 74~81
This paper introduces that the turning center optimizes main and sub spindle's synchronized controller in Open-CNC. In view of optimal design, the mathematical modeling and the frequency domain analysis of spindle's system are simulated. For the minimizing of synchronized error in each spindle's speed, the study of control method and the related control parameter is proposed. By the experiment in prototype machines using the server/client program, the validity of the proposed synchronous error's compensation method is verified.
Ultrasonic Inspection of Internal Defects of Potatoes
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 82~88
The nondestructive internal quality evaluation of agricultural products has been strongly required from the needs for individual inspection. Recently, the ultrasonic wave has been considered as a solution fur this problem, and an ultrasonic system was constructed for the ultrasonic NDE of fruits and vegetables in our previous work. In this paper, the practical applicability of our ultrasonic system is tested fur the inspection of internal defects (central cavity) in Atlantic potato. Sound speed and RMS of transmitted ultrasonic wave signal were measured and classification algorithm using 2 dimensional stochastic analysis. was presented. Experimental results showed greater value of sound speed and RMS (root mean square) of transmitted signal in normal samples than in abnormal samples with cavity. Also a stochastic method to distinguish normal and abnormal showed fault detection rate less than 5%.
Robust Control of a 6-Link Electro-Hydraulic Manipulator using Parallel Feed forward Compensator
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 89~96
An electro-hydraulic manipulator using hydraulic actuators has many nonlinear abetments, and its parameter fluctuations are greater than those of an electrically driven manipulator. So it is relatively difficult to realize not only stable but also accurate trajectory control for the autonomous assembly tasks using hydraulic manipulators. In this report, we propose a two-degree-of-freedom control including parallel feedforward compensator (PFC) where PFC plays a very important role in the stability of a proposed control system. In the experimental results of the 6-link electro hydraulic manipulator, it is verified that the stability and the model matching performance are improved by using the proposed control method.
Workspace and Kinematical Characteristics of Planar Parallel Manipulator with Simple
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 97~104
This paper proposes a new parallel manipulator fur plane motion, and then discusses on the workspace and kinematical characteristics of the manipulator. The conventional planar parallel manipulators have some disadvantages which are complex non-closed type direct kinematics, workspaces containing useless voids, and concave type border tines of workspaces. The proposed planar parallel manipulator overcomes the above disadvantages, that is, the manipulator has simple closed type direct kinematics, a void-free workspace, and a convex type borderline of a workspace. This paper shows the simulation result of the workspace as well as performances indices using a homogeneous inverse Jacobian.
Automatic Process Planning by Parsing the Parameters of Standard Features
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 105~111
This paper presents an approach to automate process planning of press dies for manufacturing of car bodies. Considering that the press-dies used at the same press operations regardless of the panels they produce or the car models of which they produce panels have similar shapes except for the forming part of the dies, general approaches to recognize manufacturing features from CAD models are not necessary. Therefore, a hybrid approach is proposed combining feature-based design and feature-extraction approaches. The proposed method recognizes features by parsing the parameters extracted from CAD models and finds proper operations by querying the database by the recognized features. An internet-based process planning system is developed to demonstrate the proposed approach and to suggest a new paradigm of process planning system that utilizes an internet access to the CAD system.
Identification of parameter for Bearing Using Orbit Data
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 112~119
This paper presents the identification of rotor dynamic parameters. The solution of the system equation can be obtained using least square method. The sensitivity analysis is performed to extract optimized solution, which is considered to be insensitive to inherent measurement errors. The cosine and sine term of orbit shapes can be obtain ed through the by experiment of the orbit analysis at a different speed after doing orbit analysis at an arbitrary selected speed. This values measured time domain are used to search the stiffness and damping coefficients of rotor bearing.
Nonlinear Analysis of the Monoleaflet Polymer Valve according to Shape of Supporting Members
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 120~124
Monoleaflet polymer artificial heart valve was known to show remarkable improvement in antithrombosis and pressure drop compared with other type of artificial valve. In this investigation of monoleaflet heart valve the vertical and horizontal deflection pattern of polymer heart valve with three types of supporting members, straight member and two curved members were analysed using the large deformation nonlinear finite element method.
Joint Characteristics of the Nylon/Metal Sliding Machine Elements
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 125~132
The joint method and characteristics of MC nylon and metal are analyzed. Considering the productivity and economics, two materials are joined with the process of turning, knurling, and induction heating. The joint strength is determined by adhesion of the melted nylon, the size of knurl, and the interference from the difference of the diameters. The adhesion strength of the melted nylon is measured. The effects of the knurl size and diameter difference are analyzed with the statistical methods. Finally the joint strength is analyzed in the environments of low, room, and high temperature. Based on this study, the nylon/metal material is expected to be widely used as the sliding machine elements with good lubrication and strength properties.
A Study on the Kinematic Winding Control Algorithm for Degressive Pirn Winding
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 133~139
Direct motor-driven winding has been increasingly applied in winding machinery. However, it is necessary to analyze the kinematics of winding prior to developing the winding control algorithm, because direct motor-driven winding machine should be operated in accordance with the pre-determined kinematic information for the winding control. This paper presents the kinematics of the degressive winding method and its kinematic winding control algorithm in order to wind the required volume of a pirn package in a desired shape. The proposed algorithm can give the appropriate yarn speed, traverse speed, and the spin speed of the spindle at every traverse stroke, which are utilized for controlling the spindle motor and traverse motor of the winding machine. Computer winding simulations showed that the proposed algorithm is successful in the degressive pirn winding.
A Study on the Design of the Warper Beam Considering Friction
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 140~148
An analysis fur the warping process has been performed to design the warper beam. Nonlinear material response is included in the physical model of polyester yarn. Large deformation finite element simulation considering contact and frictional analysis are used to obtain the pressure on the barrel of the warper beam. Loading condition on the flange is assumed by using the pressure on the barrel, winding number of yarn, Poisson's ratio of fiber, and fiber volume fraction. By using the above loading conditions NASTRAN finite element simulation is performed to calculate stress distribution and deformation of the warper beam. By comparing the deformed shape of the flange with experimental result, loading condition on the flange has been obtained. The obtained loading conditions on the barrel and flange can be utilized to design the warper beam.
A Study on the Safety Estimation of Low Pressure Torsion mounted Turbine Blade
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 149~156
The estimation of fatigue limit for the component with complicated shape is difficult than of standard fatigue specimen, due to complex test equipment. So, we substitute maximum principle stress from FEM results for fatigue limit diagram made by standard fatigue specimen. Then we can estimate endurance safety of component with high trust. The static stress analysis, the nonlinear contact stress analysis and the model analysis for turbine blade is performed by ANSYS ver. 5.6. the comparison of maximum static stress around hole with maximum contact stress between pun and hole can make the cause of fracture for turbine blade clear. The difference of fatigue limit between fatigue test by standard specimen and in-service mechanical components is due to surface roughness and machining condition etc. In in-service mechanical components, Goodman diagram has to consider surface roughness for failure analysis. To find fracture mechanism of torison-mounted blade in nuclear plant. This study performs the static stress, the nonlinear contact stress and the modal analysis on torison-mounted blade with finite element method and makes the estimation for safety of turbine blade.
Quantitative Nondestructive Evaluation of Bonded Joints utilizing Pulse-Echo Ultrasonic Test
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 157~164
The pulse-echo method is one of the most widely used ultrasonic techniques for application of nondestructive evaluation. Particularly, quantitative nondestructive evaluation of defects has been considered more important to assure the reliability and the safety of structure. Frequency energy in adhesive joints is based on the ultrasonic wave analysis. The attenuation coefficient upon wave amplitude and the frequency energy that is expressed in the term of wave pressure amplitude were utilized for the primary wave experiment. By means of a control experiment, it was confirmed that the variation of the frequency energy in adhesive joints depends on transition by stress variation. In this paper, the ultrasonic characteristics were measured for single lap joint and Double Cantilever Beam specimen with different fracture modes that was subjected to stress. Consequently, the data that was obtained from the adhesive specimen was analytically compared to the fracture mechanics parameter
A Study on Cold Working Properties of Aluminum Plates for Aircraft Structure
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 165~171
In a structure, many components are fastened together using bolts, nuts and rivets through drilled holes. Not only do these fastened joints enable easy assembly and dismantling, they are also able to transfer as well as to distribute loads applied onto the structures. The major drawback of such connections, however, is that the fatigue life of the components is reduced by the presence of the hole since the stress concentration around the hole is increased. In addition, the hole drilling process itself may introduce defects or roughness at the surfaces of the hole that may cause further decrease in fatigue performance of the components. For applications where fatigue loadings are important, one way to compensate the decrease in fatigue life of the components is by introduction of beneficial compressive residual stress around the hole using cold working. The material used for this research were A12024-T351 and A17050-T7451 using the primary member of aircraft. We present, In this paper, the characteristics of coldworking by evaluation of the hole expansion ratio, residual stress distribution, and fatigue properties.
A Study on the Deflection of the Rectangular Plates with the Rectangular Rigid Body with respect to the Boundary Conditions
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 172~177
This paper investigates the effect of reinforced plate on the deflection of the rectangular plate, when the rectangular plate is reinforced with rectangular rigid body at the centroid of the plate. For two boundary conditions such as simple supported and clamped boundary This study derives deflection formula of reinforced plates with three kinds of the aspect ratio of a rectangular plate with respect to the elastic modulus ratio and the length ratio of rigid body using the least square method. The results are as follows: 1. As the elastic modulus ratio r
1000, the maximum deflection with respect to the length ratio r
converges into constant value. 2. Deflection formula with respect to the length ratio r
is derived as the third order polynomial.l.
An Experimental Study on the Impact Characteristics of Surface Hardened Al 5052-H34 Alloy
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 178~186
In order to investigate the fracture behaviors (penetration modes) and the resistance to penetration during ballistic impact of Al 5052-H34 alloy laminates, cold-rolled Al 5052-H34 alloy laminates, anodized Al 5052-H34 alloy laminates, and anodized Al 5052-H34 alloy after cold-rolling, a ballistic testing was conducted. In general, superior armor materials are brittle materials which have a high hardness. Ballistic resistance of these materials was measured by a protection ballistic limit (V
), a statistical velocity with 50% probability fur incompletete
Development of On-machine Flatness Measurement Method
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 187~193
This paper presents an on-machine measurement method of flatness error fur surface machining processes. There are two kinds of on-machine measurement methods available to measure flatness errors in workpieces: i.e., surface scanning method and sensor scanning method. However, motion errors are often engaged in both methods. This paper proposes an idea to realize a measurement system of flatness errors and its rigorous application for estimation of motion errors of the positioning system. The measurement system is made by modifying the straightness measurement system, which consists of a laser, a CCD camera and processing system, a sensor head, and some optical units. The sensor head is composed of a retroreflector, a ball and ball socket, a linear motion guide unit and adjustable arms. The experimental .results show that the proposed method is useful to identify flatness errors of machined workpieces as well as motion errors of positioning systems.
A Study on Filtration System Model and Comparative Performance Tests of Automotive
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 194~201
This study presents the comparative filtration performance evaluation of automotive fuel filters based on the theory of Beta ratio. For the experiments, the fuel component's test stand incorporating the multi-pass filtration test circuit was developed. A mathematical description of filtration process in general was derived. And the theoretical basis of multi-pass test and the test procedure were described in detail. Experimental results revealed that domestic fuel filter tested could not maintain consistent Beta ratio, that is filtration efficiency, although it had the holding capacity of contaminants close to the specification at maximum pressure drop across the filter assembly. The results of experiments and simulations also showed that filtration system model could be refined including desorption ratio to estimate the variable Beta ratio in service life.
Compact Robotic Arm to Assist with Eating using a Closed Link Mechanism
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 202~209
We succeeded to build a cost effective assistance robotic arm with a compact and lightweight body. The robotic arm has three joints, and the tip of robotic arm to install tools consists of a closed link mechanism, which consisted of two actuators and several links. The robotic arm has been made possible by the use of actuators typically used in radio control devices. The controller of the robotic arm consists of a single chip PIC only. The robotic arm has a friendly user interface, as the operators are aged and disabled in most cases. The operator can manipulate the robotic arm by voice commands or by pressing a push button. The robotic arm has been successfully prototyped and tested on an elderly patient to assist with eating. The results of field test were satisfactory.
3-D Analysis and Inspection of Surface Mounted Solder Pastes by Point-to-Surface
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 210~220
This work presents a method of point to surface assignment fur 3D metrology of solder pastes on PCB. A bounding box enclosing the solder paste tightly on all sides is introduced to avoid incorrect assignment. The shape of bounding box fur solder paste brick is variable according to geometry of measured points. The surface geometry of bounding box is obtained by using five peaks selected in the histogram of normalized gradient vectors. By using the bounding box enclosing the solder pastes, the task of point-to-surface assignment has been successfully conducted, then geometrical features are obtained through the task of surface fitting.
Approximate Life Cycle Assessment of Classified Products using Artificial Neural Network and Statistical Analysis in Conceptual Product Design
Journal of the Korean Society for Precision Engineering, volume 20, issue 3, 2003, Pages 221~229
In the early phases of the product life cycle, Life Cycle Assessment (LCA) is recently used to support the decision-making fer the conceptual product design and the best alternative can be selected based on its estimated LCA and its benefits. Both the lack of detailed information and time for a full LCA fur a various range of design concepts need the new approach fer the environmental analysis. This paper suggests a novel approximate LCA methodology for the conceptual design stage by grouping products according to their environmental characteristics and by mapping product attributes into impact driver index. The relationship is statistically verified by exploring the correlation between total impact indicator and energy impact category. Then a neural network approach is developed to predict an approximate LCA of grouping products in conceptual design. Trained learning algorithms for the known characteristics of existing products will quickly give the result of LCA for new design products. The training is generalized by using product attributes for an ID in a group as well as another product attributes for another IDs in other groups. The neural network model with back propagation algorithm is used and the results are compared with those of multiple regression analysis. The proposed approach does not replace the full LCA but it would give some useful guidelines fer the design of environmentally conscious products in conceptual design phase.