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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Manufacturing Process Engineers
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Journal DOI :
The Korean Society of Manufacturing Process Engineers
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Volume & Issues
Volume 11, Issue 6 - Dec 2012
Volume 11, Issue 5 - Oct 2012
Volume 11, Issue 4 - Aug 2012
Volume 11, Issue 3 - Jun 2012
Volume 11, Issue 2 - Apr 2012
Volume 11, Issue 1 - Feb 2012
Selecting the target year
Structural Analysis of Bike Handle Installed with Smart Phone Depository
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 1~8
This study investigates stress and deformation due to static and dynamic vibration analysis about various types of bike handles installed with smart phone depositories. When force is applied on the side of handle at the models of type 1, 2, 3 and 4, the maximum equivalent stress is highest at type 2. The stress or deformation becomes lowest among these 4 model types. At vibration analysis, type 1 becomes safest within the range of 500Hz and type 3 becomes stable within the range of 100Hz. The result of this study can be applied with the design of bike handle installed with smart phone depository. The damage or deformation due to vibration can be prevented when the bike falls down. This result can be widely utilized to investigate and predict the durability.
Domestic Development of Vibrational Film Forming Machine and Die and Mold in the High Speed Production(I) - Single production forming machine -
Kim, Jung-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 9~15
Vibrational film has been more employed in ear-phones or small type of speakers along with a wide use of portable multi-media equipments such as MP3 and MP4. However, the current hand work production process of diaphragms is inefficient. In this study, a die-and-mold and a single production forming machine are developed, and they result in a multi-production forming machine. The multi-production forming machine consists primarily of a film feeding unit and an unwinding unit. A vacuum suction device provides the film feeding unit, while the unwinding unit is obtained using an appropriate damper. The advantage of the developed single production forming machine is shown according to a proper voice test.
Friction Stir Welding Characteristics of AZ31 Mg Alloy by Orthogonal Array
Kang, Dae-Min ; Park, Kyoung-Do ; Kang, Chung-Yun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 16~21
Magnesium alloy has been focussed as lightweight material owing to its high strength even though low density with aluminum alloy, titanium alloy and plastic material. Friction stir welding technique was performed by rotating and plunging a shouldered tool with a small diameter pin into the joint line between two butted plates and useful to join magnesium alloy. In this paper, the experiments of friction stir welding were done to investigate the joint characteristics of AZ31 magnesium alloy. For its evaluation, the orthogonal array method
was applied with four factors of pin diameter, shoulder diameter, travel speed and rotation speed of tool and also three levels of each factor. Nine tools were worked through shoulder diameter of 9, 12, 15mm and pin root diameter of 3, 4, 5mm. In addition tensile tests were excuted for the assessment of mechanical properties for joint conditions. From the results, pin diameter, shoulder diameter, and rotating speed of tool influenced on the tensile strength meaningful, but welding speed did not influence on that by the variance analysis. Beside of that, optimum condition of tensile strength was estimated as following ; shoulder diameter:15mm, welding speed:200mm/min, rotating speed:200rpm.
Analyses of Shear and Frictional Characteristics in Drilling Process
Kim, Sun-Il ; Choi, Won-Sik ; Son, Jae-Hwan ; Jang, Eun-Suk ; Lee, Young-Moon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 22~27
Drilling process is usually the most efficient and economical method of making a hole in a solid body. However, there have been no analytical method to assess drilling process based on the shear and frictional characteristics. In this paper, procedures for analyzing shear and frictional processes of drilling have been established by adopting an equivalent turning system to drilling. A series of drilling experiments were carried out with varying feed, velocity and drill shape factors. Using the results of the experiments, the cutting characteristics including shear in the primary shear zone and friction in the chip-tool contact region of drilling process have been analyzed. The specific cutting energy tends to decrease exponentially with increase of feed rate. In drilling process 35-40% of the total energy is consumed in the friction process. This is greater than that of turning process in cutting of the same work material.
A Numerical Analysis on Flow Uniformity of SCR Reactor for 5,000PS Grade Marine Engine
Yi, Chung-Seob ; Jeong, In-Guk ; Suh, Jeong-Se ; Park, Chang-Dae ; Jeong, Kyoung-Yul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 28~35
This study is on SCR reactor, NOx reduction system in Marine that has been an issue nowadays. Especially design data was obtained by numerical on flow uniformity that is one of the design factor in SCR reactor. Also pressure drop on catalyst size inserted into SCR reactor was compared by experiment and numerical analysis. S/W, numerical analysis used for this study was confirmed that the result of numerical analysis used STAR-CCM+, common use CFD code, pressure drop on catalyst is not big different from the result of numerical analysis. In addition, degree of uniformity of liquid on SCR reactor was over 0.9. Whereas it was assured that degree of uniformity of liquid was changed depends on the shape of pipe at the entrance of SCR.
Turning of Plastic Mold Steel(STAVAX) using Whisker Reinforced Ceramic
Bae, Myung-Il ; Lee, Yi-Seon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 36~41
In this study, we turning plastic mold steel (STAVAX) against cutting speed, depth of cut, feed rate using whisker reinforced ceramic tool (WA1). To predict cutting force, analyze principal, radial, feed force with multi-regression analysis. Results are follows: From the analysis of variance, affected factor to cutting force feed rate, depth of cut, cutting speed in order and cutting speed was very small affect to cutting force. From multi-regression analysis, we extracted regression equation and the coefficient of determination
was 0.9, 0.88, 0.856 at principal, radial and feed force. It means regression equation is significant. From the experimental verification, it was confirmed that principal, radial and feed force was predictable by regression equation.
Effect of Metals used in Orthopedic on Magnetic Resonance Imaging III
Kim, Hyeong-Gyun ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 42~47
Followed by a paper on the Pig and Bone orthopedic prosthetic, this experiment using Phantom and Bone MRI imaging I, II of orthopedic prosthetic metal effect combines magnetic resonance imaging on metal signal-to-noise ratio(Signal to noise : SNR) and CNR(Contrast to noise: CNR), fat signal suppression(Fat-suppression) images was compared. Specimen trees to measure the reliability of the experimental reproducibility tests and statistical analysis using the SPSS statistical package was applied program SPSS(IBM SPSS Statistice 19) by * P = 0.000 < significance level
= 0.01 as a significant there was a correlation(** P < 0.01). SNR and CNR results did not directly proportional to the Titanium, Stainless, Clip CNR and fat signal suppression of the order of images of blood specimens was found to be close to the image. The impact of orthopedic prosthetic metals on magnetic resonance imaging in the diagnostic value of Titanium is relatively high and are meant more.
A Study on the Optimal Machining of 12 inch Wafer Polishing by Taguchi Method
Choi, Woong-Kirl ; Choi, Seung-Gun ; Shin, Hyun-Jung ; Lee, Eun-Sang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 48~54
In recent years, developments in the semiconductor and electronic industries have brought a rapid increase in the use of large size silicon. However, for many companies, it is hard to produce 400mm or 450mm wafers, because of excesive funds for exchange the equipments. Therefore, it is necessary to investigate 300mm wafer to obtain a better efficiency and a good property rate. Polishing is one of the important methods in manufacturing of Si wafers and in thinning of completed device wafers. This research investigated the surface characteristics that apply variable machining conditions and Taguchi Method was used to obtain more flexible and optimal condition. In this study, the machining conditions have head speed, oscillation speed and polishing time. By using optimum condition, it achieves a ultra precision mirror like surface.
A Study on the Development of High Pressure Holder for Machining
Yi, Chung-Seob ; Jeong, In-Guk ; Suh, Jeong-Se ; Chung, Sang-Wan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 55~61
In this study, it was grasped to the flow characteristics of injection nozzle installed in high pressure holder for improving productivity. Chip curling occurred during cutting process for difficult-to-cut material detracts product qualities and productivity. Among of method preventing the phenomenon, high pressure injecting cutting oil is an alterative. In this study, the optimal nozzle was designed by CFD method and it was conducted to analyse on the effect of high pressure injection on chip shape generated during cutting process and wear of insert by experimental method. As the result, it could be confirmed that high pressure injection is favorable for preventing chip curling and insert from wearing.
Parametric Modeling of a Screw Fabricated by Turning
Kim, Ho-Chan ; Ko, Tae-Jo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 62~68
Geometry of a screw fabricated by a turning process determined by the shape of the tool, feed rate of the tool and rotation speed of the spindle. Therefore, computing the exact geometry of the screw is very important to perform a simulation on machining or an evaluation of the workpice quality. In this paper, a new mathematical geometry model of the 3 dimensional screw is fabricated by turning process introduced for the exact geometry computation. Becasue model has a parametric formulation, it is easy to process for a CAD geometry or apply for a machining simulation. Also, it can be applied to process planning because it gives precise machined geometry on whole the 3 dimensional surface of the screw. This paper introduces a new parametric model of a geometry for screw fabricated by turning process. As an application, a simulation software for the 3 dimensional screw surface is developed and evaluated for several manufacturing parameters.
A Prediction of Surface Roughness on the PCD Tool Turned Al5083 by using Regression Analysis
Lee, Sun-Woo ; Lee, Dong-Ju ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 69~74
Surface roughness is widely used as an index for processing degree of accuracy. Recently, regression analysis to predict the machining results are actively used to characterize a cutting operations. In the past, diamond machining had been used for ultra precision cutting operation, but now industrial diamond tools like PCD(Polycrystalline Diamond) have been widely used in ultraprecision machining of nonferrous metals. In this study, the authors focus on the effect of PCD tool property on the surface roughness of Al5083 aluminum alloy after cutting process by CNC operated lathe. Based on the regression analysis approach on a surface roughness data obtained by experiment, predictive analysis of surface roughness is effective to achieve better surface quality.
The Study of Quality Evaluation on Dissimilar Material Friction Welding of Poly-urethane Foaming Machine Components
Yang, Yong-Mo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 75~81
Dissimilar material friction welding such as STD11 and SCM440, we are considering of such things as strength and tenacity of welding interface, which consist of friction welding rotation frequency, friction heating pressure, upset forging-pressure, friction heating time, and upset forging-pressure time. From the study, obtaining the interrelationship between welding condition and quality(toughness, tenacity), we can set the best range of welding condition. while performing acoustic emission examination for the nondestructive evaluation, we can deduce the interrelationship among total acoustic emission counts, friction welding variable, and quality during friction welding, which can solve the manufacturing difficulty and enhance the economic value.
Development of Vehicle Door Side Impact Beam with High Tensile Steel using Roll Forming Process
Son, Hee-Jin ; Kim, Sung-Yuk ; Oh, Beom-Seok ; Kim, Key-Sun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 82~87
The purpose of this study is to produce a side impact beam with high tensile steel using a roll forming process. The door side impact beam plays an important roll in a car because it protects passengers from external crash. The roll forming process is a continuous bending process wherein a long metal sheet is bended as it continuously passes several rolls. The characteristic of this study is that an impact beam is produced by a continuous process using a ultra high strength steel without a hardening heat treatment. A model was determined by analysing plasticity of a cross section shape considering high strength. Design parameters of the impact beam was determined by crash-analysing the model. Workpiece products were manufactured by designing dies for roll forming and setting them up in a following process line. Results of a bending test and a FEM analysis was considered and reviewed.
Study on Fine-shaft in Turning for Thrust Force Control
Kim, Gue-Tae ; Kim, Won-Il ; Kim, Sang-Hyun ; Kim, Kyeong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 88~93
In this study, Machining fine shaft was examined by Lathe. method is proposed to control the thrust force to 0. through relationship between the cutting depth and the thrust force in turning, fine-shaft of less than 0.1mm diameter in turning is confirmed experimentally. also we propose practical expression to control thrust force in turning Through to change the approach angle, optimal tool design would be possible in turning.
A Study Temperature of Break Disc using Two-way Layout
Ryu, Mi-Ra ; Choi, Ji-Woong ; Lee, Dae-Hee ; Lee, Seong-Beom ; Park, Jeong-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 94~99
Due to economic growth, the number of cars has grown rapidly and consequently traffic accidents have grown in direct ratio. This reminds us that braking device of a vehicle is an important factor to prevent traffic accidents. Aim these researches to speed and lighten the braking system of vehicles, to lengthen its durability and to shorten the stopping distance. However, it is still difficult to analyze quantitatively and clearly the reason and solution for abnormal wear of disc and pad or judder in flywheel mode. Therefore this study was carried out to presume for mutual relation of analysis condition to get the optimum temperature by two-way layout. The results shown that coefficient of determination has a fine reliability over 92.57% and temperature is made by two-way layout.
A Study on Engine Performance and Exhaust Emission Characteristics of Response Power 150HP Turbocharged Diesel engine
Kim, Tae-Hyun ; Lee, Chi-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 100~106
This is a thesis about the experiment of comparison characteristic of power and exhaust gas in the same condition between diesel engine that is equipped turbocharger to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment with natural aspiration diesel engine and turbocharger diesel engine, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is much higher than the other one. In other hand, in exhaust gas experiment, turbocharger model exhausts more NOX and
, but it doesn't significantly affect the result when it comes with decreasing of
and effectiveness of increased power characteristic. As a result, the turbocharger diesel engine is economically effective comparing with the natural aspiration diesel engine.
Damage Behaviors by Particle Impact Energy of
Coated Glass Specimen
Lee, Moon-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 107~114
Fracture of brittle material due to dynamic load such a particle impact has been reported by many researchers as the fracture behavior by variation of stress for a short minute. Especially, the brittle material, such a ceramic, applied to the structural component of machine, is considered as the important project. In order to evaluate the improvement of impact resistance, the particle impact test for the
coated glass is practiced. And then, the damage variation according to the impact energy of steel ball was evaluated. There was a large improvement by the ceramic coating on the surface of a glass substrate. The damage volume was especially imported to evaluate damage behavior in quantity. These data were plotted on logarithmic coordinate and experimental equations were induced by data analysis based on test results. And the variation of critical energy for crack initiation was analyzed with critical impact energy when each crack occurs.
Optimize Design for 5MW Offshore Wind Turbine Sub-structure Jack-up Platform
Jeon, Jung-Do ; Jeon, Eon-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 115~122
The purpose of this study is to optimize the design of the jack-up platform for 5MW offshore wind turbine system. Considering all the environmental loads such as currents, waves, winds and so on, the members of structures have been designed and optimized based on the AISC and API-RP-2A to be within the allowable stress even in the most critical and severe condition. In addition to the above strength check of structural members, the joint punching shear check and the hydrostatic collapse check are also performed where they are required for the design. The design life of the jack-up platform is 50 years for the static strength check and the fatigue design life is 100 years including to the DFF(Design Fatigue Factor) of 2.0 to have enough stability and workability for the design optimization.
Study on Simulation of Fuel Injection Pump for Marine Medium Diesel Engine
Yang, Young-Joon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 123~129
This study was carried out to improve the design of fuel injection pump for marine medium diesel engine. For this purpose, all parts of fuel injection pump were modeled and simulated using CATIA V5R19, FLUENT & MSC Nastran. Flow analysis for plunger cylinder and structural analysis for plunger, roller and spring, which were considered as essential parts of fuel injection pump, were performed to find the optimal design of fuel injection pump. As the results, flow of fluid in plunger cylinder was showed good results in case of 7.7~8.0m/s of plunger velocity. Furthermore, it was confirmed that plunger, roller and spring could be operated safely under 1,800bar pressure.
A Study on the Development of iGPS 3D Probe for RDS for the Precision Measurement of TCP
Kim, Tae-Hwa ; Moon, Sung-Ho ; Kang, Seong-Ho ; Kwon, Soon-Jae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 130~138
There are increasing demands from the industry for intelligent robot-calibration solutions, which can be tightly integrated to the manufacturing process. A proposed solution can simplify conventional robot-calibration and teaching methods without tedious procedures and lengthy training time. iGPS(Indoor GPS) system is a laser based real-time dynamic tracking/measurement system. The key element is acquiring and reporting three-dimensional(3D) information, which can be accomplished as an integrated system or as manual contact based measurements by a user. A 3D probe is introduced as the user holds the probe in his hand and moves the probe tip over the object. The X, Y, and Z coordinates of the probe tip are measured in real-time with high accuracy. In this paper, a new approach of robot-calibration and teaching system is introduced by implementing a 3D measurement system for measuring and tracking an object with motions in up to six degrees of freedom. The general concept and kinematics of the metrology system as well as the derivations of an error budget for the general device are described. Several experimental results of geometry and its related error identification for an easy compensation / teaching method on an industrial robot will also be included.
A Study on Tribological Characteristics of Sintered Fe-base Low Alloy Powder for Automobile Parts
Kim, Tae-Hyun ; Kim, Sang-Youn ; Kim, Tae-Gyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 139~144
In the automobile industry, the various efforts to lower their industrial cost and enhance fuel efficiency have been made through process improvement or weight saving of automobile parts. Gear is one of significant parts of transmission, which is made by cast iron or alloy steel. It is expensive due to complex processing, inferior materials and large machining allowance. In this study, alternative gear cars oil which is based on fluid applications materials is produced by reducing surface induction hardening and carburizing hardened in production. And then, wear characteristic and mechanical properties such as hardness of the sintered alloy which is used as a substitute for small machining allowance is investigated.
Estimation on Serrated Core Machining Load for Metal Gasket using Elasto-plastic Analysis
Kim, Tae-Hyung ; Lee, Seong-Wook ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 145~151
In this study, finite element analysis is carried out to estimate horizontal forces needed for the required power calculation and vertical forces applied on the structural analysis model for the development of automatic serrated surface at metal gasket core machining system. By considering of elasto-plastic material characteristics, nonlinear contact analysis was conducted to compute these loads according to the change of roll reduction, frictional coefficient and core thickness. As the result, horizontal and vertical reaction force variations are found according to parameters and maximum reaction force is also confirmed to be most affected by roll reduction.
Study on the Continuous Forming of Natural Gas Hydrate Pellet using Twin Roll System
Lee, Yun-Hu ; Kim, Heung-Soo ; Koh, Bong-Hwan ; Song, Myung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 152~157
This study investigates compressive strength of ice pellet strip which is potential medium for Natural Gas Hydrate(NGH) extruded from die holes of Twin-roll Press for Continuous Pelletizing(TPCP). Recently, the prototype of TPCP is newly developed where ice powder is continuously fed and extruded into strip-type pellet between twin rolls. The system is specifically designed for future expansion towards mass-production of ice pellet strips or solid form of natural gas hydrate. It is shown that the compressive strength of pellet strip heavily depends on factors in extrusion process such as disk size, surface smoothness, ring size, taper shape, feeding mechanism, and rotational speed. Here, the mechanism of TPCP, along with compressive strength of pellets is discussed in terms of its feasibility for producing NGH pellets in the future.
Flow and Structural Analysis at Welding Fume of Automatic Gantry Robot - CFD/CAE and Automatic Convergence Study -
Jang, Sung-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 158~163
This study investigates numerical analysis for robot welder fume flow and gantry structure. The solvers are STAR-CCM+ and ANSYS workbench used on flow and structural analysis. The results show that fume is diffused in factory when the welding fume is remove at dust collector. But dust collector intercepts the fume diffusion into workroom by removing most of welding fume. Structure analysis result shows that the reinforcement rod is evaluated to main the safety by supporting sufficient structure.
Finite Element Analysis of a Hot Profile Ring Rolling Process of the Ball Bearing Outer Race
Kim, Bong-Su ; Choi, In-Su ; Choi, Moo-Ho ; Lee, Gun-Myung ; Kim, Eung-Zu ; Joun, Man-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 164~168
In this paper, a manufacturing process for a ball bearing outer race is studied by experiments and predictions, which is composed of four hot forging stages and the final hot or warm profile ring rolling stage. An analysis model and some assumption to simulate the profile ring rolling process is introduced. The entire process including the forging stages and ring rolling stage is simulated using a rigid-thermoviscoplastic finite element method and the predictions are compared with the experiments in terms of major dimensions, showing that they are quantitatively very close to each other.
Shielding Effectiveness of Electromagnetic Interference in ABS/Nickel Coated Carbon Fiber and Epoxy/Cu-Ni Fabric Nano Carbon Black Composites
Han, Gil-Young ; Jung, Woo-Chul ; Yang, In-Young ; Sun, Hyang-Sun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 169~174
Electromagnetic interference(EMI) shielding effectiveness(SE) was investigated in of woven fabric made of epoxy/copper-nickel fabrics and nickel coated carbon fiber reinforced acrylonitrile-butadiene-styrene(ABS) composites. The coaxial transmission line method was used to measure the EMI shielding effectiveness of the composites. We designed and constructed a measuring system, consisting of a network analyzer and a device that plays the serves as a sample holder and at the same time as a transmission medium of the incident electromagnetic wave. The measurement of SE were carried out frequency range from 100MHz to 2GHz. It is observed that the SE of the composits is the frequency dependent increase with the increase in nickel coated carbon fibre volume fraction. The nickel coating with 20wt% ABS composite was shown to exhibit up to 60dB of SE. The result that nickel coated carbon fibre ABS composite can be used for the purpose of EMI shielding as well as for some microwave applications.
A Study on Light Quality of LED for Control of Light Intensity
Park, Sang-Hee ; An, Jun-Chul ; Heo, Jung-Wook ; Choi, Han-Ko ; Choi, Sung-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 175~182
Light characteristics of the monochromatic red(R), blue(B), green(G) and white(W) and the mixed LED (B-R LED) were investigated by light control a Spectrometer-MMS1 and an illuminometer. The power consumption of each LED was 1W and R LED has five wavelength bands(600nm, 640nm, 660nm, 680nm, 750nm). The light intensity of each LED was changed in a range 10~100%. As a results, the wavelength and the spectrum distribution of R LED increase with increasing light intensity but the wavelength of B, G, W LED decreases. It was found that illumination of each mononochromatic and B-R LED increases linearly with increasing light intensity. It was confirmed that the illumination intensity of R-B light has greater values than those obtained by monochromatic light at the same conditions.
A Study on Design of Nozzle Tip for Airless Spray Coating
Kim, Dong-Keon ; Kim, Soon-Kyung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 183~188
This study was carried out to design the spray nozzle tip for airless spray coating. Airless spray coating is the process of coating an object with a liquid spray of paint or other fluid. The nozzle tip controls the fluid flow rate and creates back pressure in the system. The nozzle tip also defines the spray pattern by the size and shape of the orifice. The spray pattern of nozzle tip was investigated numerically using ANSYS CFX ver. 14.0. It was observed that performance result of designed nozzle tip was correspond well, compared with that of GARCO nozzle tip.
A Study on Flow Characteristics of Ejector for Cyclone Air Drying Machine
Kim, Bong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 189~194
The purpose of this study is to predict the performance of a cyclone drying machine and air ejector used in drying applications. This paper deals with optimization of the geometry of the ejector for sludge drying using computational fluid dynamics. To facilitate the design of a jet ejector for air drying machines, a numerical model of simultaneous mass and heat transfers between the liquid(sludge) and gas(air) phases in the jet ejector was developed. The steady-state model was based on unidimensional balance equations of mass, energy and momentum for the liquid and gas phases. It was shown that the optimum condition to minimize pressure and momentum loss of air in the ejector was d=220mm. It was found that sludge particles inside the cyclone was smoothly discharged by the conical wedge installed on the bottom of the cyclone.
A Study on Tooth Profile Modification of Planetary Reducer for 120kW Class Monorail
Jeong, Yeong-Sik ; Kim, Nam-Kyung ; Xu, Zhezhu ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 195~200
In this study, parameters and requirements of an 120kW class monorail planetary gearbox was analysed and the adaptive planetary gearbox design was selected. The specification of the sun gear, planetary gear and carrier was set and the profile & lead was optimized. The mechanical efficiency of the optimized one and the original one was observed. Dynamo-tester system was used to observe the mechanical efficiency of the planetary gearbox. A dynamo unit was connected with the planetary gearbox which straightened through the motor by a coupling. The standard tooth shape planetary gearbox and modified tooth shape planetary gearbox were used as test pieces and the rotation speed was set from 600 to 6000rpm with 600rpm, 2.5min one step. In order to check the mechanical efficiency of the planetary gearbox, the tests were done as follows. 1) The power loss between driving motor and dynamo tester. 2) Temperature variation by different rotation speeds. 3) Noise variation by different rotation speeds.
Study on Simulation of Water Cooling Heat Exchanger for Small Marine Diesel Engine
Yang, Young-Joon ; Sim, Han-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 6, 2012, Pages 201~207
This study was carried out to improve the design of heat exchanger for small marine diesel engine. As air pollutants emitted from small marine diesel engine become international problem, IMO(International Marine Organization) tried to establish severe regulations for NOx reduction. The formation of NOx is affected by cooling system, for instance, such as intercooler, heat exchanger, exhaust manifold, and therefore cooling systems are one of essential parts for design of small marine diesel engine. In this study, heat exchanger for small marine diesel engine was modeled and simulated using CATIA V5R19 and ANSYS FLUENT V.13. Thermal flow simulation for heat exchanger was performed to find the optimal design. As the results, maximum velocity of engine coolant in shell inside was 9.1m/s and it was confirmed that outlet temperature and temperature drop for engine coolant could be calculated by simulating proportional relations of temperature between engine coolant and sea water.