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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 23, Issue 12 - Dec 2006
Volume 23, Issue 11 - Nov 2006
Volume 23, Issue 10 - Oct 2006
Volume 23, Issue 9 - Sep 2006
Volume 23, Issue 8 - Aug 2006
Volume 23, Issue 7 - Jul 2006
Volume 23, Issue 6 - Jun 2006
Volume 23, Issue 5 - May 2006
Volume 23, Issue 4 - Apr 2006
Volume 23, Issue 3 - Mar 2006
Volume 23, Issue 2 - Feb 2006
Volume 23, Issue 1 - Jan 2006
Selecting the target year
The Characteristics of Ultra Precision Machining of Optical Element Germanium
Yang Sun-Choel ; Kim Geon-Hee ; Kim Hyo-Sik ; Lee Sang-Yong ; Bok Min-Gab ; Won Jong-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 7~13
Research on Ultra-Precision Grinding Method
Park Soon-Sub ; Lee Ho-Jae ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 14~21
The Development of VGA Level Omni-Directional Surveillance Camera used Ultra Precision Machine
Kim Geon-Hee ; Yang Sun-Choel ; Kim Hyo-Sik ; Lee In-Je ; Bok Min-Gab ; Kweon Gyeong-Il ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 22~28
Nano-Level Mirror Surface Machining Technology for SiC Ceramics Mirror
Kwak Tae-Soo ; Ohmori Hitoshi ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 29~36
Ultra Precision Machining Characteristics of HMD Optics System used PMMA
Yang Jin-Seok ; Yang Sun-Choel ; Kim Gun-Hee ; Kim Hyo-Sik ; Kim Myung-Sang ; Won Jong-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 37~43
Development of Press Forming Technology for the Multistage Fine Tooth Hub Gear
Kim Dong-Hwan ; Ko Dae-Cheol ; Lee Sang-Ho ; Byun Hyun-Sang ; Kim Byung-Min ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 44~51
This paper deals with the aspects of die design for the multistage fine tooth hub gear in the cold forging process. In order to manufacture the cold forged product for the precision hub gear used as the ARD 370 system of bicycle, it examines the influences of different designs on the metal flow through experiments and FE-simulation. To find the combination of design parameters which minimize the damage value, the low gear length, upper gear length and inner diameter as design parameters are considered. An orthogonal fraction factorial experiment is employed to study the influence of each parameter on the objective function or characteristics. The optimal punch shape of fine tooth hub gear is designed using the results of FE-simulation and the artificial neural network. To verify the optimal punch shape, the experiments of the cold forging of the hub gear are executed.
Burrless shearing of the micro wire
Kim Woong-Kyum ; Hong Nam-Pyo ; Kim Heon-Young ; Kim Byeong-Hee ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 52~56
Punching tools like an electrodes are made by milling or etching or EDM. These methods had time consuming, low efficiency and air pollution. So, we have developed a shearing device which counter punching method for burrless cutting of micro wire. Using the straightened SUS304 wire with
diameter, we confirmed the tendency of the shear plane for punch tools. It was impossible to completely remove the bun in the shearing process. In order to minimize the burr size and fine shear plane, we have accomplished the various experiment conditions such as the U-groove, the effect of the counter punch, shear angle and clearance. The results of the experiments show that indentation, slip plane and bent shape were related to the shear angle and clearance.
Precise Measurement of Unbalance Moment Using 3-Point Weighing Method
Lee Sun-Pyo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 57~63
Gravitational centers of precise spinning components must coincide with the rotational centers of those to reduce noise and vibration and to extend those lift as well. Therefore quality control should be performed in the manufacturing process, in which the unbalance moments are accurately measured. In this paper 3-point weighing method is adopted to measure the unbalance moment of small-sized precision spinning elements using electronic scales with 0.1 mg resolution. Firstly methods to eliminate the fixture error and to reduce the effects of frictional force that is known as side effect, are proposed. A measuring system is developed and various experiments are performed to verify the proposed approach. The measured and calculated values are analysed in statistical methods, and this provides the errors of the measuring system. The results show that the proposed theory and test procedures gives reliable unbalance moments and gravitational centers.
A Study on the Adaptive Piezoelectric Energy Harvesting
Park Jong-Soo ; Nam Yoon-Su ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 64~71
A target of this paper is to study on the usefulness of the adaptive piezoelectric energy harvesting device as a wireless electrical power supply when it is driven by mechanical vibrations of low frequency. For this purpose, an adaptive control technique and a step-down converter are used. A THUNDER series a piezoelectric material (TH7-R), which has been developed by a NASA engineer is selected for this study. In order to provide a mechanical energy to the piezoelectric material, a mechanical motion vibrator is designed. The adaptive controller is implemented using a dSPACE DS1104 controller board. The do-dc converter with an adaptive control technique harvests energy at over five times the rate of direct charging without a converter.
Simulation Integration Technique of a Full Vehicle Equipped with EPS Control System
Jang Bong-Choon ; So Sang-Gyun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 72~80
Electric Power Steering (EPS) mechanism has become widely equipped in passenger vehicle due to the increasing environmental concerns and higher fuel efficiency. This paper describes the development of concurrent simulation technique and simulation integration technique of EPS control system with a dynamic vehicle system. A full vehicle model interacting with EPS control algorithm was concurrently simulated on a single bump road condition. The dynamic responses of vehicle chassis and steering system resulting from road surface impact were evaluated and compared with proving ground experimental data. The comparisons show reasonable agreement on tie-rod load, rack displacement, steering wheel torque and tire center acceleration. This concurrent simulation capability was employed fur EPS performance evaluation and calibration as well as for vehicle handling performance integration and synthesis.
Gain Scheduled Control for Disturbance Attenuation of Systems with Bounded Control Input - Theory
Kang Min-Sig ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 81~87
A new gain-scheduled control design is proposed to improve disturbance attenuation for systems with bounded control input. The state feedback controller is scheduled according to the proximity to the origin of the state of the plant. The controllers is derived in the framework of linear matrix inequality(LMI) optimization. This procedure yields a linear time varying control structure that allows higher gain and hence higher performance controllers as the state move closer to the origin. The main results give sufficient conditions for the satisfaction of a parameter-dependent performance measure, without violating the bounded control input condition.
Gain Scheduled Control for Disturbance Attenuation of Systems with Bounded Control Input - Application to Stabilization Control
Kang Min-Sig ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 88~95
In this paper, the gain-scheduled control design proposed in the previous paper has been applied to a target tracking system. In such system, it is needed to attenuate disturbance effectively as long as control input satisfies the given constraint on its magnitude. The scheduled gains are derived in the framework of linear matrix inequality(LMI) optimization by means of the MatLab toolbox. Its effectiveness is verified along with the simulation results compared with the conventional optimum constant gain and the scheduled gain control with constant Q matrix cases.
Optimal design of a flexure hinge-based XY AFM scanner for minimizing Abbe errors and the evaluation of pitch measuring uncertainty of a nano-accuracy AFM system
Kim Dong-Min ; Lee Dong-Yeon ; Gweon Dae-Gab ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 96~103
To establish of standard technique of nano-length measurement in 2D plane, new AFM system has been designed. In the long range (about several tens of
), measurement uncertainty is dominantly affected by the Abbe error of XY scanning stage. No linear stage is perfectly straight; in other words, every scanning stage is subject to tilting, pitch and yaw motion. In this paper, an AFM system with minimum offset of XY sensing is designed. And XY scanning stage is designed to minimize rotation angle because Abbe errors occur through the multiply of offset and rotation angle. To minimize the rotation angle optimal design has performed by maximizing the stiffness ratio of motion direction to the parasitic motion direction of each stage. This paper describes the design scheme of full AFM system, especially about XY stage. Full range of fabricated XY scanner is
. And tilting, pitch and yaw motion are measured by autocollimator to evaluate the performance of XY stage. As a result, XY scanner can have good performance. Using this AFM system, 3um pitch specimen was measured. The uncertainty of total system has been evaluated. X and Y direction performance is different. X-direction measuring performance is better. So to evaluate only ID pitch length, X-direction scanning is preferable. Its expanded uncertainty(k=2) is
measured length in nm.
Electrostatic Suspension System of Flexible Objects using Relay Feedback Control
Jeon Jong-Up ; Kim Sun-Min ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 104~110
A design and control of electrostatic suspension system for flexible objects is presented. A number of electrode pairs of which the number depends on the object flexibility are positioned above the object and the voltages applied to each electrode pair are controlled, independently on the others, on the basis of the gap length. To implement the system with low cost and compactness, switched-voltage control scheme that is based on the relay feedback control is utilized. Relay feedback control method deploys only a single high-voltage power supply that can deliver a DC voltage of positive and/or negative polarity and thus high voltage amplifiers that are costly and bulky are not needed any more. It is shown that despite the inherent limit cycle property of the relay feedback based control, an excellent performance in vibration suppression is attained due to the presence of a relatively large squeeze film damping originating from the electrodes and levitated object. Employing fourteen electrode pairs, a thin aluminum plate with a thickness of 0.1 mm has been suspended at a gap length of 0.75mm.
Reliability Evaluation of ATC for High-Speed Line Center
Lee Seung-Woo ; Lee Hwa-Ki ; Shin Dong-Hwan ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 111~118
Recently, the reliability evaluation and analysis are applied far many industrial products which are required to guarantee in quality and efficiency. The purpose of this paper is to present some of reliability evaluation methodologies that are applicable to machine tools. Especially ATC (Automatic Tool Changer), which is a core component of line center, was chosen as the target of the reliability evaluation and analysis. The scope of research is reliability prediction, reliability test and evaluates their results. The results of reliability evaluation have shown the failure rates, MTBF (Mean Time Between Failure), reliability for those components of ATC and real tests reliability through the constructed reliability test-bed. It is expected that proposed methodologies would increase reliability for a high-speed line center.
Damage Detection in Time Domain on Structural Damage Size
Kwon Tae-Kyu ; Yoo Gye-Hyoung ; Lee Seong-Cheol ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 119~127
A non-destructive time domain approach to examine structural damage using parameterized partial differential equations and Galerkin approximation techniques is presented. The time domain analysis for damage detection is independent of modal parameters and analytical models unlike frequency domain methods which generally rely on analytical models. The time history of the vibration response of the structure was used to identify the presence of damage. Damage in a structure causes changes in the physical coefficients of mass density, elastic modulus and damping coefficients. This is a part of our ongoing effort on the general problem of modeling and parameter estimation for internal damping mechanisms in a composite beam. Namely, in detecting damage through time-domain or frequency-domain data from smart sensors, the common damages are changed in modal properties such as natural frequencies, mode shapes, and mode shape curvature. This paper examines the use of beam-like structures with piezoceramic sensors and actuators to perform identification of those physical parameters, and detect the damage. Experimental results are presented from tests on cantilevered composite beams damaged at different locations and different dimensions. It is demonstrated that the method can sense the presence of damage and obtain the position of a damage.
Finite Element Modeling of Contact Joints by Flexibility Influence Coefficient
Cho Seong-Wook ; Oh Je-Taek ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 128~135
Rational dynamic modeling and analysis method f3r complex structures are studied with special attention to slide way joints. For modeling of slide way joints, a general modeling technique is used by using the influence coefficients method which is applied to the conversion of detailed finite element model to the equivalent reduced joint model. The theoretical part of this method is illustrated and the method is applied to the structure with slide way joint. In this method, the non-linearity of the contact surfaces is considered within a proper range and the boundary effect of the joint model could be eliminated. The proposed method was applied to finite element modal analysis of a clamp jointed cantilever beam and slide way joints of the vertical type lathe. The method can also be used to other kinds of joint modeling. The results of these analysis were compared with those of Yoshimura models and rigid joint models, which demonstrated the practical applicability of the proposed method.
Stringer Shape Optimization of Aircraft Panel Assembly Structure
Kim Hyoung-Rae ; Park Chan-Woo ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 136~142
Optimization of the aircraft panel assembly constructed by skin and stringers is investigated. For the design of panel assembly of the aircraft structure, it is necessary to determine the best shape of the stringer which accomplishes lowest weight under the condition of no instability. A panel assembly can fail in a variety of instability modes under compression. Overall modes of flexure or torsion can occur and these can interact in a combined flexural/torsion mode. Flexure and torsion can occur symmetrically or anti-symmetrically. Local instabilities can also occur. The local instabilities considered in this paper are buckling of the free and attached flanges, the stiffener web and the inter-rivet buckling. A program is developed to find out critical load for each instability mode at the specific stringer shape. Based on the developed program, optimization is performed to find optimum stringer shape. The developed instability analysis program is not adequate for sensitivity analysis, therefore RSM (Response Surface Method) is utilized instead to model weight and instability constraints. Since the problem has many local minimum, Genetic algorithm is utilized to find global optimum.
Optimization of District Heating Pipes Considering Thermal Fatigue Life
Ahn Min-Yong ; Chang Yoon-Suk ; Choi Jae-Boong ; Kim Sang-Ho ; Kim Youn-Hong ; Kim Young-Jin ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 143~150
Recently, in proportion to increased demand on environmentally-friendly heat source, efficient management of district heating(DH) system becomes one of important issue. The objectives of this paper are to systematize data processing of transition temperature, investigate the effect of temperature variations on thermal fatigue and find out a way to improve design fractures of Korean DH pipes. For this purpose, reliable fatigue lift evaluation procedures are examined and applied to quantify thermal fatigue lives. Also, as a prototypal optimization analysis results, mean value of original cross sectional area of selected pipes was reduced 18.6% sustaining their sufficient margins against fatigue failure. So, it is anticipated that the output of this research can be used as useful information of optimal design and operation in the future.
End-mill Modeling and Manufacturing Methodology via Cutting Simulation
Kim Jae-Hyun ; Kim Jong-Han ; Ko Tae-Jo ; Park Jung-Whan ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 151~159
This paper describes a design process of end-milling cutters: solid model of the designed cutter is constructed along with computation of cutter geometry, and the wheel geometry as well as wheel positioning data f3r fabricating end-mills with required cutter geometry is calculated. In the process, the main idea is to use the cutting simulation method by which the machined shape of an end-milling cutter is obtained via Boolean operation between a given grinding wheel and a cylindrical workpiece (raw stock). Major design parameters of a cutter such as rake angle, inner radius can be verified by interrogating the section profile of its solid model. We studied relations between various dimensional parameters and proposed an iterative approach to obtain the required geometry of a grinding wheel and the CL data for machining an end-milling cutter satisfying the design parameters. This research has been implemented on a commercial CAD system by use of the API function programming, and is currently used by a tool maker in Korea. It can eliminate producing a physical prototype during the design stage, and it can be used for virtual cutting test and analysis as well.
Design of a High-Transmission C-Shaped Nano-Aperture in a Perfectly Electric Conductor Film
Park Sin-Jeung ; Hahn Jae-Won ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 160~165
We have designed a high-transmission nano aperture in a perfect electric conductor film with the incident beam of 532 nm wavelength. The aperture basically has a C-shape and is known to produce a bright spot nearby the aperture in small size less than diffraction limit. The bright spot is strongly coupled with the local plasmon excited through the aperture hole. The characteristics of transmission and peak power of the aperture output were calculated using finite differential time domain (FDTD) technique, and the geometry of the aperture was determined to get a maximum transmission and peak power. To find the effect of the surface plasmon induced near by the aperture, we calculated the variations of the transmittance and the beam sizes by changing the size of the input beam irradiated on the aperture.
Electrostatically-Driven Polysilicon Probe Array with High-Aspect-Ratio Tip for an Application to Probe-Based Data Storage
Jeon Jong-Up ; Lee Chang-Soo ; Choi Jae-Joon ; Min Dong-Ki ; Jeon Dong-Ryeol ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 166~173
In this study, a probe array has been developed for use in a data storage device that is based on scanning probe microscope (SPM) and MEMS technology. When recording data bits by poling the PZT thin layer and reading them by sensing its piezoresponse, commercial probes of which the tip heights are typically shorter than
raise a problem due to the electrostatic forces occurring between the probe body and the bottom electrode of a medium. In order to reduce this undesirable effect, a poly-silicon probe with a high aspect-ratio tip was fabricated using a molding technique. Poly-silicon probes fabricated by the molding technique have several features. The tip can be protected during the subsequent fabrication processes and have a high aspect ratio. The tip radius can be as small as 15 nm because sharpening oxidation process is allowed. To drive the probe, electrostatic actuation mechanism was employed since the fabrication process and driving/sensing circuit is very simple. The natural frequency and DC sensitivity of a fabricated probe were measured to be 18.75 kHz and 16.7 nm/V, respectively. The step response characteristic was investigated as well. Overshoot behavior in the probe movement was hardly observed because of large squeeze film air damping forces. Therefore, the probe fabricated in this study is considered to be very useful in probe-based data storages since it can stably approach toward the medium and be more robust against external shock.
Modification of the curing characteristics of the photocurable resin FA1260T for 3D microfabrication using microstereolithography
Kim Sung-Hoon ; Jung Dae-Jun ; Joo Jae-Young ; Jeong Sung-Ho ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 174~179
The curing characteristics of a photocurable resin are critical factors that often decide the ultimate resolution and structural sharpness of a final product fabricated by microstereolithography
. In this study, we investigated the curing characteristics of the FA1260T photopolymer under a visible laser light of 42nm wavelength. Modification of the curing property of the FA1260T is attempted to reduce the cure depth
by adding a radical quencher to the resin. Also, an organic solvent was used to reduce the resin viscosity for an improvement of the flatness of the liquid surface during layer-by-layer curing. As a result, the minimum
has been reduced over a factor of 3 with no abrupt increase. Samples of three dimensional microstructures fabricated using the modified FA1260T are presented.
Analysis of the Bone-remodeling Process Considering Stimuli Delivery Cell Model
Moon Hee-Wook ; Kim Young-Eun ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 180~186
To investigate the bone remodeling phenomenon around implant device, 3-D mathematical simulation model was developed. Strain energy density from the finite element method was chosen for the indicator for remodeling process. Recursive calculations continued until converged results between FEM and mathematical model. For a osteo-integration example, bone-remodeling process in a implanted tibia of beagle was adapted. Calculated results indicated that the bone densities around screw pitch were increased which indicates firm fixations between the bone and implant. Screw design parameters have an influence on initial stability of the implant rather than remodeling process.
Bench Mark Test on Rapid Prototyping Processes and Machines for Functional Prototypes
Kim Gi-Dae ; Sung Joo-Hyung ;
Journal of the Korean Society for Precision Engineering, volume 23, issue 6, 2006, Pages 187~195
FDM, SLS, and EOS processes are the layered manufacturing processes far functional prototypes. In this paper, bench mark tests of those processes were carried out using various materials. The test includes mechanical properties, such as tensile and compressive strengths, hardness, impact strength, and heat resistance, and surface roughness, shape and dimensional accuracy, manufacturing time, and manufacturing costs. It is verified that SLS method is advantageous in surface roughness and manufacturing time, EOS method in shape accuracy, and FDM method is great in manufacturing costs.