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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 24, Issue 6 - Dec 2015
Volume 24, Issue 5 - Oct 2015
Volume 24, Issue 4 - Aug 2015
Volume 24, Issue 3 - Jun 2015
Volume 24, Issue 2 - Apr 2015
Volume 24, Issue 1 - Feb 2015
Selecting the target year
Design and Evaluation of a Crankcase Relief Valve Spring for LNG-Fueled Ships
Lee, Hyo Ryeol ; Ahn, Jung Hwan ; Ahn, Byoung Hoon ; Kim, Hwa Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 263~269
DOI : 10.7735/ksmte.2015.24.3.263
Growing concerns regarding air pollution have recently increased the demand for liquefied natural gas (LNG) fueled ships. LNG-fueled ships are equipped with an explosion relief valve in the crankcase to relieve excessive pressure and stop flames from emitting from the crankcase. In this study, a finite element analysis was conducted to evaluate the crankcase relief valve disk spring design using an ANSYS Workbench, v.15. The setting pressure, leak and explosion test performed by european standard EN14797 to evaluate function and mechanical integrity of crankcase relief valve. The tests results indicate that the pressure of the crankcase relief valve is 3.05 bar, with no air leakage at 2.97 bar. Finally, the mechanical integrity of the crankcase relief valve was confirmed through an explosion test in which the valve plate assembly, flame arrester, and other parts were safe from fracturing.
A Study on the Optimum Design of the Condenser Lens of a Compact Electrostatic-Type SEM
Kim, Ki-Hwan ; Jang, Dong-Young ; Park, Man-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 270~277
DOI : 10.7735/ksmte.2015.24.3.270
In this paper, we describe the production of a specific electrostatic-type scanning electron microscope based on miniaturization for application in other types of vacuum equipment. The initial configuration of the SEM starts with a minimal configuration that allows people to view sample images. After improving the stability of the SEM operation and resolution, we conducted experiments on identifying the characteristics and development of an einzel-type condenser lens with reference to the demagnification lens system of an SEM. The experiments were conducted at an acceleration voltage of 5 kV and we found the shape of the lens to be more reliable than a conventional lens. The lens was then added to improve the resolution in the nanometer region. The current measured on the sample was approximately 40 pA and its magnification was 4,000 times.
The Influence of Main Bearing Stiffness on the Gearbox of 3 Point Suspension Wind Turbine Drive Train
Nam, Ju Seok ; Nam, Yong Yun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 278~286
DOI : 10.7735/ksmte.2015.24.3.278
The effects of the main bearing stiffness combined with vertical non-torque force on the input load and shaft deflection of a gearbox were investigated for the three-point suspension drive train of a wind turbine. A finite element analysis model for the drive train was studied experimentally, and its applicability to the present study was verified. The results show that, as the main bearing stiffness is increased, the input load of the gearbox decreases, whereas the input shaft deflection increases. The stiffness component for the pitch moment has the largest influence on the gearbox input load. Although the gearbox life increases at a higher main bearing stiffness, the economic efficiency and durability of the entire drive train system should also be considered in the selection of the main bearing stiffness.
Analysis on the Clutch Torque of Automated Manual Transmission Vehicle during Dynamometer Test
Choi, Woo-Seok ; Lim, Wonsik ; Oh, Ducksoo ; Park, Sung-cheon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 287~293
DOI : 10.7735/ksmte.2015.24.3.287
With the rise in oil prices and ongoing concerns about environment, there is an increased amount of interest in automated manual transmission (AMT) vehicles. Torque control in an AMT vehicle is attained by controlling the displacement of the dry-type clutch`s actuator. To provide good ride comfort akin to that of an automatic transmission vehicle, the clutch control is vital to an AMT vehicle. In this study, a method of obtaining the clutch torque from a dynamometer test is devised. This method is able to identify the relationship between the displacement of the clutch actuator and the clutch torque. A simulator for estimating the performance of an AMT vehicle is developed using MATLAB Simulink. The results obtained from both the vehicle and simulation exhibit a similar trend.
Experimental Approach and Simulation-Based Design of Eddy Current Sensors for Inspection of Vehicular Bolts
Im, Kwang-Hee ; Lee, Seul-Gi ; Kim, Hak-Joon ; Song, Sung-Jin ; Woo, Yong-Deuck ; Ra, Seung-Woo ; Lee, Hyung-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 294~301
DOI : 10.7735/ksmte.2015.24.3.294
Oil filters for vehicular parts are used under high and low temperatures as the engine is cooled, and defects can be generated with repeated changes in the operating environment and with changes in the shape, such as very high internal losses for the bolts. Visually checking for defects inside a bolt is impossible. Nondestructive evaluation methods such as eddy current testing (ECT) are recommended as a more effective way to examine inside a bolt and detect surface defects in a short amount of time. In this study, the fit bobbin coil eddy current probe was applied to checking the bolts. The bolt parameters were calculated by using a COMSOL analysis program to obtain parameters for professional interior design and fault diagnosis.
Approximate Optimization Design Considering Automotive Wheel Stress
Lee, Hyunseok ; Lee, Jongsoo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 302~307
DOI : 10.7735/ksmte.2015.24.3.302
The automobile is an important means of transportation. For this reason, the automotive wheel is also an important component in the automotive industry because it acts as a load support and is closely related to safety. Thus, the wheel design is a very important safety aspect. In this paper, an optimal design for minimizing automotive wheel stress and increasing wheel safety is described. To study the optimal design, a central composite design (CCD) and D-optimal design theory are applied, and the approximate function using the response surface method (RSM) is generated. The optimal solutions using the non-dominant sorting genetic algorithm (NSGA-II) are then derived. Comparing CCD and D-optimal solution accuracy and verified the CCD can deduce more accuracy optimal solutions.
Approximate Multi-Objective Optimization of Scroll Compressor Lower Frame Considering the Axial Load
Kim, JungHwan ; Lee, Jongsoo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 308~313
DOI : 10.7735/ksmte.2015.24.3.308
In this research, a multi-objective optimal design of a scroll compressor lower frame was approximated, and the design parameters of the lower frame were selected. The sensitivity of the design parameters was induced through a parameter analysis, and the thickness was determined to be the most sensitive parameter to stress and deflection. All of the design parameters regarding the mass are sensitive factors. It was formulated for the problem about stress and deflection to be caused by the axial load. The sensitivity of the design variables was determined using an orthogonal array for the parameter analysis. Using the central composite and D-optimal designs, a second polynomial approximation of the objective and constraint functions was formulated and the accuracy was verified through an R-square. These functions were applied to the optimal design program (NSGA-II). Through a CAE analysis, the effectiveness of the central composite and D-optimal designs was determined.
A Study on Processing Shape and Overcutting of Invar Sheet by Pulse Electrochemical Machining
Yang, Bu-Yeol ; Kim, Seong-Hyun ; Choi, Seung-Geon ; Choi, Woong-Hirl ; Chun, Kwang-Ho ; Lee, Eun-Sang ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 314~319
DOI : 10.7735/ksmte.2015.24.3.314
Invar is a compound metal of Fe-Ni system contained 36.5% Ni. The characteristic of invar is that the coefficient of thermal expansion is
. It is approximately 10 times smaller than series of steel. Because of this low thermal expansion characteristic of Invar, it is used to shadow mask of display device such as UHDTV or OLED TV. In this study, pulse current from pulse generator instead of DC current is used to overcome the disadvantages of the conventional electrochemical machining. Pulsed current with different duty factor in PECM affect the precise geometry. Pulse electrochemical machining is conducted to machine the micro hole to the invar sheet with different duty factor. The machined shape and overcut of invar sheet with different duty factor is observed by optical microscope and scanning electron microscope (SEM).
Experimental Study on Transmission Errors of a Single-Stage Planetary Gear Train: Influence of Torque and Speed Variations
Song, Jinseop ; Lee, Geun-Ho ; Park, Young-Jun ; Nam, Yong-Yun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 320~326
DOI : 10.7735/ksmte.2015.24.3.320
Despite the wide industrial applications of planetary gear trains, the relationship between the design parameters (tooth profile, carrier mass, etc.) and performance (strength, vibration, noise, etc.) remains poorly understood. A significant amount of research has focused on transmission errors, which are measurable performance indicators directly related to the design parameters. Herein, an experimental test rig for a single-stage planetary gear set built using digital angular encoders and gap sensors is described. To study the static and dynamic characteristics of this planetary gear train, the transmission errors and sun gear orbit are analyzed from the data measured under various levels of torque and speed. The transmission errors of the gear train decrease 40% when the speed increases from 30 to 600 rpm with an output torque of 39.2 Nm, and increase 22% when the output torque increases from 19.6 to 39.2 Nm with an input speed of 30 rpm.
Application of LabView
-Based Parameter Scheduling Programming for a 6-Axis Articulated Robot
Kim, Seong-Bhn ; Chung, Won-Jee ; Kim, Hyo-Gon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 327~333
DOI : 10.7735/ksmte.2015.24.3.327
As industrial robots come into wider use, their control techniques are being developed along with enhancements in their performance. Specially, the dynamic performance of a 6-axis articulated industrial robot is greatly changed according to the position and orientation of the robot. This means that the PI parameter tuning of the robot and orientation of the robot. This mconsidering the dynamic characteristics of robot mechanism. In this study,
programming was applied to automatically conduct parameter scheduling for various robot motions. Using forward and inverse kinematics of RS2, we can divide the working envelope of RS2 into 24 subspaces. We then conduct the gain-tuning according to each subspace. Finally, we program the actual gain scheduling, in which the optimized gain-tuning for each subspace to be passed should be changed for various robot motions using
A Study on the Comparison Mechanical Properties of 3D Printing Prototypes with Laminating Direction
Park, Chan ; Kim, Myung Hun ; Hong, Sung Moo ; Go, Jeung Sang ; Shin, Bo Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 334~341
DOI : 10.7735/ksmte.2015.24.3.334
This paper summarizes the results of an investigation into the environmental factors that have an indirect impact on parts quality, as well as those process variables and modeling information that have a direct impact. The effects of strength, surface hardness, roughness, and accuracy of shape, that is, qualities that users generally need to know, were evaluated with laminating direction experimentally. The 3D printing methods used in this experiment were fused deposition modeling (FDM), stereolithography apparatus (SLA), selective laser sintering (SLS), 3D printing (3DP) and laminated object manufacturing (LOM). The goal was to achieve a high standard of quality control and product quality by optimizing the fabrication process.
Vibration and Shock Safety Verification for Missile Launcher Pod
Kim, Man-Dal ; Hong, Seong-Wook ; Hyun, Jong-Hoon ; Kim, Dong-Kook ; Lee, Seung-Jun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 342~347
DOI : 10.7735/ksmte.2015.24.3.342
The launcher pod for missiles capable of carrying a range of different warheads has been designed to be mounted on the tracked vehicle of the hybrid weapon system (HWS). In the development of this launcher pod, its structure was designed to be resilient to damage caused by shock and vibration, as well as preventing assembly errors due to the spring-back of the main composite cover and interfacing parts. This study investigated the design of the newly developed launcher pod, with its hybrid composite-metal structure, through simulation and experiment. Both simulation and actual experiments showed that the structure of the launcher is resilient to vibration and shock. The launcher pod was also subjected to vibration and shock tests to verify its performance.
Characteristic Study of a Magnet Gear Speed Reducer with a Unified Harmonic Modulator
Lee, Sang Jun ; Jung, Kwang Suk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 348~354
DOI : 10.7735/ksmte.2015.24.3.348
Using a magnetic gear, the speed and torque of the driving axis can be decreased and increased, respectively, similar to a mechanical speed reducer. In particular, because the driving side can be isolated mechanically from the load side, the magnetic gear was developed for application with environmental constraints. Of the existing topologies used for the magnet gear, the filtering method of a specified magnetic component is the most competitive. In this paper, a novel unified harmonic modulator is applied to filter the specified component. The torque conversion method using this modulator is described in detail, and the key factors of the modulator are derived from the influence on the resulting torque. The experimental setup was constructed and its torque transmission efficiency measured for varying loads. The transient characteristic from an excessive load is compared with the theoretical simulation.
Development on Test Procedure of Pitch and Yaw Bearings for Wind Turbine
Nam, Ju Seok ; Han, Jeong Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 24, issue 3, 2015, Pages 355~362
DOI : 10.7735/ksmte.2015.24.3.355
Test procedure for the design verification of wind turbine pitch and yaw bearings has been developed. Test items were selected to evaluate operational reliability of pitch and yaw bearings by considering loading and operational conditions, and by analyzing the design criteria of pitch and yaw bearings. The developed test items consisted of preliminary test, fatigue load test, extreme load test, low temperature environmental test and dismantling inspection after all the test were completed. Because it reflects the actual operational conditions of the pitch and yaw bearings, the developed test procedure has high reliability and can verify the basic design considerations in the international standard and guidelines.