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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 30, Issue 12 - Dec 2013
Volume 30, Issue 11 - Nov 2013
Volume 30, Issue 10 - Oct 2013
Volume 30, Issue 9 - Sep 2013
Volume 30, Issue 8 - Aug 2013
Volume 30, Issue 7 - Jul 2013
Volume 30, Issue 6 - Jun 2013
Volume 30, Issue 5 - May 2013
Volume 30, Issue 4 - Apr 2013
Volume 30, Issue 3 - Mar 2013
Volume 30, Issue 2 - Feb 2013
Volume 30, Issue 1 - Jan 2013
Selecting the target year
Theoretical Analysis on the Optimum Fluence for Copper Ablation with a 515 nm Picosecond Laser
Shin, Dongsig ; Cho, Yongkwon ; Sohn, Hyonkee ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1009~1015
DOI : 10.7736/KSPE.2013.30.10.1009
Ultra-short laser pulses are effective, when high requirements concerning accuracy, surface roughness and heat affected zone are demanded for surface structuring. In particular, picosecond laser systems that are suited to be operated in industrial environments are of great interest for many practical applications. This paper focused on inducing optimum process parameters for higher volume ablation rate by analyzing a relationship between crater diameter and optical spot size. In detail, the dependency of the volume ablation rate, penetration depth and threshold fluence on the pulse duration 8 ps and wavelength of 515 nm was discussed. The experimental results showed that wavelength of 515 nm resulted in less threshold fluence (
) on copper than IR wavelength (
). As a result, it was possible that optimum fluence for higher volume ablation rate was achieved with
Laser Microfabrication of Multidirectional Side-fire Optical Fiber Tip
Jung, Deok ; Sohn, Ik-Bu ; Noh, Young-Chul ; Kim, Jin-Hyeok ; Kim, Changhwan ; Lee, Ho ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1017~1022
DOI : 10.7736/KSPE.2013.30.10.1017
Currently, various optical fiber tips are used to deliver laser beam for endoscopic surgery. In this paper, we demonstrated multidirectional (forward and side) firing optical fiber tip using a femtosecond micromachining and
laser polishing technology. We controlled the edge width of optical fiber tip, by modulating the condition of
laser, to regulate the amount of side and forward emission. The distal end of the optical fiber with core/clad diameter of
was microstructured with cone shape by using a femtosecond laser. And then the microstructured optical fiber tip was polished by
laser beam result in smoothing and specular reflection at the surface of the cone structure. Finally, we operated the LightTools simulation and good agreement was generally found between the proposed model and experimental simulation.
Experimental Study on Rolling Stability of Quadruped and Hexapedal Water Running Robots
Kim, HyunGyu ; Kim, Jung Hyun ; Seo, ByungHoon ; Seo, TaeWon ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1023~1029
DOI : 10.7736/KSPE.2013.30.10.1023
Water running animals such as basilisk lizards have an advantage of high-speed movement and high power efficiency on water; so researchers in robotic fields have been interested in the water running locomotion. This paper presents prototype-design and experimental study on the fourand six-legged water running robot. Based on the previously proposed quadruped water running robot, we assemble a hexapedal water running robot. The legs of the water running robot are designed based on four-bar parallel link for repeated motion along to pre-defined path. Stability performance of the quadruped and hexapedal water running robot are investigated by experiments on rolling criterion. As a result, hexapedal robot performs better stability than quadruped robot. Based on the hexapedal robot design, we are planning to optimize the position of legs and operating frequency.
Gain Optimization of a Back-Stepping Controller for 6-Dof Underwater Robotic Platform
Kim, Jihoon ; Kim, Jong-Won ; Jin, Sangrok ; Seo, TaeWon ; Kim, Jongwon ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1031~1039
DOI : 10.7736/KSPE.2013.30.10.1031
This paper presents gain optimization of a 6-DOF underwater robotic platform with 4 rotatable thrusters. To stabilize the 6-DOF motion of the underwater robotic platform, a back-stepping controller is designed with 6 proportional gains and 6 derivative gains. The 12 gains of the backstepping controller are optimized to decrease settling time in step response in 6-DOF motion independently. Stability criterion and overshoots are used as a constraint of the optimization problem. Trust-region algorithm and hybrid Taguchi-Random order Coordinate search algorithm are used to determine the optimal parameters, and the results by two methods are analyzed. Additionally, the resulting controller shows improved performance under disturbances.
Implementation of a Small Size Electric Automatic Lubrication System for Heavy Commercial Vehicle
Kim, Man Ho ; Lee, Sang Hyeop ; Lee, Suk ; Lee, Kyung Chang ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1041~1049
DOI : 10.7736/KSPE.2013.30.10.1041
One of the causes of malfunction of commercial vehicle is corrosion or wear. In order to prevent corrosion and wear, lubricants have to be supplied periodically. However, the period of lubrication usually depends on operator`s judgment. If the period is too short, excess lubricant will cause pollution and unnecessary expenses, where as long periodic supply of lubricant might cause wear, damage and eventual breakdown. Therefore, an automatic lubrication system with predetermined interval will reduce the excessive supply of lubricating oil and prevent wear and damage. This thesis presents an automatic lubrication system which consists of a lubricant pump and an embedded controller. An automatic lubrication operating algorithm is used to operate the lubricant pump and feedback the pressure status of the system using pressure sensors. The developed system shows an efficient periodic supply of lubricant.
Control of Secondary Suspension in Railway Vehicles Equipped with a MR Damper
Shin, Yu Jeong ; You, Won Hee ; Hur, Hyun Moo ; Park, Joon Hyuk ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1051~1059
DOI : 10.7736/KSPE.2013.30.10.1051
In general, lateral ride comfort of railway vehicle is mainly influenced by a secondary suspension placed between the bogie and carbody. Higher operating speeds of train results in increased vibration of carbody, which has a negative impact related to the ride comfort. To solve this problem, researches to replace the conventional passive suspension with (semi)active technology in the secondary suspension of a railway vehicle have been carried out. The semi-active suspension using the magneto-rheological damper is relatively simpler system and has advantage in maintenance compared to the hydraulic type semi-active damper. This study was performed to reduce lateral vibration acceleration of carbody related to ride comfort of railway vehicles with a semi-active suspension system. The numerical analysis was conducted by replacing passive lateral damper with semi-active MR damper, and robust control with the MR damper was applied to the 1/5 scaled railway vehicle model.
Optimization of Sandwich Structures of a Small Aircraft Wing using Automated Aero- Structure Interaction Systems
Park, Chan Woo ; Chu, Jae Myeong ; Shul, Chang Won ; Jun, Seung Moon ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1061~1068
DOI : 10.7736/KSPE.2013.30.10.1061
In this research, the design optimization of a composite sandwich has been performed for using as an airplane wing skin. Automated analysis framework for aero-structure interaction is used for calculating load data on the wing. For automated analysis framework, FLUENT is used for computational fluid dynamics (CFD) analysis. CFD mesh is generated automatically by using parametric modeling of CATIA and GAMBIT. A computational structure mechanics (CSM) mesh is generated automatically by the parametric method of the CATIA and visual basic script of NASTRAN-FX. The structure is analyzed by ABAQUS. Composite sandwich optimization is performed by NASTRAN SOL200. Design variables are thicknesses of the sandwich core and composite skin panel plies. The objective is to minimize the weight of the wing and constraints are applied for wing tip displacement, global failure index and local failure indexes.
A Study on the Design of High-speed Parallel Robot
Kim, Byung In ; Kyung, Jin Ho ; Do, Hyun Min ; Jo, Sang Hyun ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1069~1077
DOI : 10.7736/KSPE.2013.30.10.1069
These days, the interest of high speed robotic system is increasing because it is very important to get the cost-competitiveness. The parallel kinematic mechanism is more useful than the serial kinematic mechanism. For the reason, the researches on the parallel robot system as a high speed robotic one are have been done by many researchers. In this paper, the research on the design and analysis of the high speed parallel robot has been done by the authors. First, Basic robot structure is designed and modal analysis is studied to get the basic characteristics of the vibrational motion. Second, the harmonic analysis is studied to get the information of the natural frequency in some different designs of the outer-arm of the parallel robot. Finally, actual robot system is designed and implemented and it is confirmed that the analysis results coincide with the experimental results.
Optimum Design based on Sequential Design of Experiments and Artificial Neural Network for Heat Resistant Characteristics Enhancement in Front Pillar Trim
Lee, Jung Hwan ; Suh, Myung Won ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1079~1086
DOI : 10.7736/KSPE.2013.30.10.1079
Optimal mount position of a front pillar trim considering heat resistant characteristics can be determined by two methods. One is conventional approximate optimization method which uses the statistical design of experiments (DOE) and response surface method (RSM). Generally, approximated optimum results are obtained through the iterative process by a trial and error. The quality of results depends seriously on the factors and levels assigned by a designer. The other is a methodology derived from previous work by the authors, which is called sequential design of experiments (SDOE), to reduce a trial and error procedure and to find an appropriate condition for using artificial neural network (ANN) systematically. An appropriate condition is determined from the iterative process based on the analysis of means. With this new technique and ANN, it is possible to find an optimum design accurately and efficiently.
Measurement Method for Geometric Errors of Ultra-precision Roll Mold Machine Tool: Simulation
Lee, Kwang-Il ; Yang, Seung-Han ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1087~1093
DOI : 10.7736/KSPE.2013.30.10.1087
In this study, a measurement method of double ball-bar is proposed to measure the geometric errors of an ultra-precision roll mold machine tool. A volumetric error model of the machine tool is established to investigate the effects of the geometric errors to a radius error and a cylindricity of the roll mold. A measurement path is suggested for the geometric errors, and a ball-bar equation is derived to represent the relation between the geometric errors and a measured data of the double ball-bar. Set-up errors, which are inevitable at the double ball-bar installation, also are analyzed and are removed mathematically for the measurement accuracy. In addition, standard uncertainty of the measured geometric errors is analyzed to determine the experimental condition. Finally, the proposed method is tested and verified through simulation.
The Effect on Improvement of Muscle Strength Imbalance According to Load Deviation Protocol of Whole Body Vibration Exercise
Seo, Shin Bae ; Kang, Seung Rok ; Yu, Chang Ho ; Min, Jin Young ; Kwon, Tae Kyu ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1095~1101
DOI : 10.7736/KSPE.2013.30.10.1095
The purpose of this study was to verify the effect on improvement of muscle strength unbalance according to load deviation protocol during whole body vibration exercise. Seventeen female volunteers (age
kg) participated in this experiment. The subjects performed squat exercise in WBV platform. Exercise were performed five set a day including 15 time a set, three days a week, and during 4 weeks. Vibration stimulus was 25Hz as frequency and intensity was dominant leg 1mm and non-dominant leg 4mm. The results in WBV group showed that the differences of peak torque in 16% were getting decreasing significantly after 4 weeks from 16.2% to 5.2%. This result means that WBV with load deviation protocol could provide muscle strength exercise for muscle strength balance. Our study found out that WBV of load deviation protocol could provide muscle strength exercise for improving muscle imbalance.
Optimal Capacity Design and Economic Evaluation of Hybrid Generation Systems Based on the Load Characteristics
Lim, Jong Hwan ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1103~1109
DOI : 10.7736/KSPE.2013.30.10.1103
This paper presents an optimal capacity design of a Hybrid generation system based on economical evaluation for various loads. Optimal sizes of a standalone and grid connection wind- PV hybrid systems were designed for normal, residential and industrial loads using HOMER (Hybrid Optimization Model for Electronic Renewable). Their economical evaluation were performed and compared with a diesel generation system that covers the same loads. The results showed that the stand alone hybrid generation system can be more economical than a diesel generation system for long term operation.
Quantitative Evaluation of Shape Accuracy in a Hat-type Product with UHSS according to the Forming Procedure
Choi, Byeung Hyeun ; Kim, Se Ho ; Kim, Heung Kyu ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 10, 2013, Pages 1111~1117
DOI : 10.7736/KSPE.2013.30.10.1111
In this paper, the shape accuracy of the stamped hat-type product is quantified and analyzed with ultra high strength steel (UHSS) sheets. The shape of the hat-type product is designed in order to simplify the geometry of the side sill and the stamping methodology is proposed in order to verify the effect of the stamping procedure on the springback amount. Experiments and finite element analyses are conducted with four kinds of the forming sequences. The springback amounts are measured and compared according to the forming procedure with the embossing shape. Experimental result in company with analysis one illustrate that the springback amount is reduced with embossing in the padding operation. They also fully demonstrates the proposed forming procedure and the analysis method can be effectively applied to the process design for producing parts with ultra high strength steel.