한국기계기술학회지 [Journal of the Korean Society of Mechanical Technology]

간행물 정보
  • 자료유형
  • 발행기관
    한국기계기술학회 [Korean Society of Mechanical Technology]
  • ISSN
  • 간기
  • 수록기간
  • 등재여부
    KCI 등재
  • 주제분류
    공학 > 기계공학
  • 십진분류
    KDC 550 DDC 621
제17권 제6호 (22건)



동파방지용 열선을 적용한 밀폐된 원형 배관내에서 자연대류의 열유동 특성에 관한 연구

서규원, 박형선, 윤준규

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1143-1151

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In this study, the heat flow characteristics of natural convection was theoretically analyzed with time by changing various locations of heat trace with tube surface about enclosed circular tube by applying nominal tube diameter 90 mm of KS D 3507. Before carrying out CFD (Computational Fluid Dynamics) analysis, It is presumed that It is presumed that the boundary condition is the tube’s inside and outside fluid temperature of 273 °K, the tube surface heat flux according to the heat trace location of 16 W/m. The result confirmed that water of inside tube is occurred natural convection caused by density difference depending on temperature profile. Additionally, in case of heat trace location, the heat transfer and flow characteristics showed clearly that two-heat trace location Θ=135° and 180° was more favorable distribution than one-heat trace appropriate location Θ=135°.



페주물사에 함유된 철 입자 용융화를 통한 철 괴 생산에 관한 연구


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1152-1158

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The waste casting sands generated from foundry is about 4,000 tons/day and the great part of them is handled by the method of reclamation and just 10% of them is recycled as a sand. This study is to produce the iron lump of high quality material through melting iron particle which is obtained from thewaste casting sands. By using the high frequency inductive melting furnace after separating iron particle from casting sand by collision and vibrating classifier, iron lump is produced from melting iron particles. The iron lump of iron content of 96.95% is produced from iron particle of 68.05% through this process. It was investigated that the cost of iron lump is four times higher than the one of iron particle and to produce iron lump is worth to 325 won per kg against iron particle with considering the consumed power(electric energy). Therefore, to produce iron lump from waste casting sands is not only to be economical worth but also to strengthen the ground resources system.



급속냉각ㆍ가열장치를 활용한 결정성 수지에서 사출제품의 휨에 대한 연구

이민, 김태완

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1159-1166

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This study was developed the rapid heating and cooling device using peltier module for uniform cooling. make the rapid heating and cooling device(RCHD), for traditional water cooling device(TWCD) method and the rapid heating and cooling method warpage were compared and were analyzed and the materials used crystalline PP polymer. various warpage were compared for the process parameters such as packing pressure, packing time, mold temperature. in the crystalline PP polymer, TWCD method has higher warpage than RCHD method and show the result to be a bit more uniform cooling. RCHD method has higher warpage than TWCD method as cooling time and packing time increases and TWCD method has higher warpage than RCHD method as mold temperature increases.



메탄올 Fuel Cell 내의 유로 형상에 대한 열유동해석

백수홍, 이동렬

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1167-1173

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This research is to investigate the performance analysis of methanol fuel cell for flow channel with four different types of the channel (Serpentine I, II, Inter-digitated, Parallel) in the fuel cell stack. Velocity, pressure, temperature and density distributions of fluid over the flow domain of the flow channel are numerically calculated for the optimum design of flow channel with uniform inlet velocity. According to better water discharge and mutual gas reaction with low pressure drop and high density difference between inlet and outlet in the flow channel, Serpentine I type is of highest performance of the flow channel shapes in the present methanol fuel cell models.



사각 수분류에 의한 가열면상에서의 열전달 특성에 대한 실험적 연구


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1174-1184

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Jet impingement heat transfer is a very effective technique for exchanging high heat fluxs between a heated plate and a fluid. The purpose of this study is to investigate the heat transfer characteristics of a rectangular free water jet normally or obliquely impinging onto a flat plate. The water jet issued from a rectangular slot nozzle with a cross section of 1.5mm⨉40mm. The mean velocities of nozzle exit were varied from 1.5m/s to 6.1m/s. The Reynolds number range based on the nozzle gap and the mean velocity was 2200∼8800. Various impingement angles between the vertical rectangular water jet and the inclined flat surface were investigated : 90℃ , 70℃ , 60℃ and 50 ℃. The Nusselt number is high at the impingement line, and decreases with departures from it. The stagnation Nusselt numbers were compared to predictions of several correlations proposed by other researchers. The locations of the peak Nusselt numbers do not coincide with the geometric center of the rectangular jet on the surface.



자동차구조용강(ATOS 80) 탄산가스아크용접에서 용가재 변화에 따른 용접 특성 연구


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1185-1192

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The purpose of this study is to research into which characteristic is shown according to a change in filler metal in case of CO2 gas arc welding by using Automobile Structural Steel(ATOS80). The major characteristics of this study were experimented by having Bevel angle as 50°, Root gap as 3mm, Filler metal as Solid wire & Flux wire, and the projected length of wire as 15mm. This study made the welded test specimens for the KS specification in advance suitably for the conditions, thereby having comparatively analyzed with the data value that was obtained through tensile test, hardness test, impact test and Macro Structure Detecting. Arranging the results that analyzed finally, the tensile strength and the hardness appeared to be excellent in case of welding with flux wire. The impact strength was indicated to be superior in case of welding with solid wire.



무연솔더를 적용한 자동차 전장부품의 기계적 접합강도 및 오차 범위에 관한 연구

윤준호, 전유재

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1193-1200

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This study has assessed mechanical bonding strength of lead-free solder joint. Assessment methods was performing long-term reliability test about thermal shock, thermal life and high temperature & high humidity. Based on the results of analyzing mean values that was obtained from repetion of 5 times according to each conditions, reduction of mechanical bonding strength of each tests was confirmed. When it comes to HB chip, the order of high deviation rate was shown thermal shock, high temperature & humidity and thermal life. And the higher deviation rate of R0 is high temperature & humidity, thermal life and thermal shock. The order of high deviation rate of C1 chip is high temperature & humidity, thermal shock and thermal life. Related to this result of experiment, the most stable error range of mechanical bonding strength is established. From now on optimized quantity of solder and shape of solder-joint is needed by establishing a test method which can make error range of mechanical bonding strength minimize.



적층각도를 가진 접합된 Mode 1형의 CFRP 시험편 접착계면 파괴특성에 관한 해석적 연구

이정호, 조재웅

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1201-1206

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Nowadays, the study of CFRP reinforced with carbon fiber is focused on improving the the mechanical property. The study on the fracture data of CFRP are not properly made out than that of the general mechanical joint. In this study, the fracture property of mode 1 at the same condition of tensile experiment is investigated by applying the layer angle to laminated CFRP with the thickness of 15 mm. When the reaction forces until dropping out the bonded surface are compared with the cases of the layer angles of 0°, 45° and 60°, the reaction force is shown to be most and the elapsed time until dropping out the bonded surface is longest at that of 45°. The deformation energy is also shown to have the highest value by dropping out the adhesive interface. As the basis of the analysis result of this study, the most safety with fracture resistance is shown in the case of 45°. the bonded structure applying the appropriate layer angle is thought to have the structural safety.



상용차 파워스티어링 소음 저감을 위한 이론적 고찰


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1207-1213

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There are many causes of interior noise in commercial vehicles. The one of them is power steering noise and this study try to reduce the power steering noise by theoretical consideration. The interior noise was tested for the real truck and analysed the frequency. For reducing the interior noise, the spiral tube was adapted and modified the structure in the steering system. The spiral tube system was analysed and made the formula to calculate the reducing frequency. And the effective frequency for reducing the interior noise was calculated by changing the length of tube. Finally, we found the possibility between thoeretical results and real interior noise by comparing the frequency results. The second, the experimental consideration will be worked in power steering system. Finally, the optimal design result will be suggested for reduce the noise.



PEMFC 가스채널 직각 유로에서의 벽면 접촉각 분포에 따른 물 배출 특성에 대한 연구

김선우, 김우태

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1214-1220

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The volume of fluid method is applied to study the effects of the gas channel wall contact angle on the removal characteristics of a water slug in a right angle PEMFC gas channel. While maintaining the same GDL surface contact angle, two different contact angle distributions on the control area in the corner region are compared via the water coverage ratio and water volume fraction. The water coverage ratios of the hydrophobic channel corner case mainly show smaller values than that of the hydrophilic case except around 27 ms. The water volume fraction of the hydrophobic corner case is supposed to drop down quickly around 27 ms due to the dynamic movement of the liquid water compared to the hydrophilic case. In overall, the hydrophobic corner case shows better water slug removal characteristics.



문 개폐시 발생하는 충격 소음원 및 실내 방음실의 전파 특성 측정 및 분석


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1221-1228

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Quiet environment is essential for improving quality of living and rest. For example, noisy neighbors degrade quality of sleeping of residents. Due to emphasis on energy saving of buildings, more insulation and tighter sealing is applied for windows, doors, and walls of new buildings. As results, not only energy dissipation of new building is reduced, but also interior of new buildings have become significantly quieter. However, sound and heat insulation performance of existing buildings is relatively worse, when compared to that of recent buildings. As elapse of time, gap between bricks or concrete of building and sealing grows larger, worsening of sound and heat insulation performance of buildings is unavoidable. To provide quiet room for quality control of products or other purposes in noisy environment, indoor noise chamber is required in practice. In present work, sound transmission through indoor noise chamber is measured using different noise sources. For the worst case, noise source and sound transmission of door slam noise is shown.



Mode Ⅲ 형을 가진 알루미늄 폼 DCB와 TDCB 시험편에 대한 정적 파괴 거동의 비교 연구

이정호, 조재웅

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1229-1235

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Because aluminum foam is porous material, the frature property is different from that of non-porous material. This aluminum foam can be used with the joint bonded with adhesive in order to utilize the light weight to the maximum. So, the study of fracture property on bonded surface can be important. In this study, the analyses on the specimens with two kinds of configuration as DCB (Double Cantilever Beams) and TDCB(Tapered Double Cantilever Beams) aluminum foams of mode Ⅲ type bonded with adhesive are carried out and compared with each other. And the fracture properties the adhesive surfaces of the structure with bonded aluminum foams are studied as the static experiments on these verifications are done. DCB and TDCB specimens used in this study have the variable of thickness(t) as 35mm, 45mm and 55mm. As the result of this study, the range of reaction forces are 0.3 to 0.8 kN and 0.5 to 1.2 kN at DCB and TDCB specimens respectively. The results of the static experiments can also be confirmed with these similar results. These study results can be obtained by only a simulation without the special experimental procedures. The mechanical properties of the bonded structures composed of DCB and TDCB aluminum foams with mode Ⅲ type can be thought to be analyzed effectively.



오르간 액셀페달의 스프링상수에 따른 답력특성 연구

박경민, 정석훈, 박상현

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1236-1241

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It analyzes the new structure and mechanism of organ type accel pedal to have a double curve to obtain a low effort force has been devised an electronic accel pedal consisting of two springs. To confirm the characteristics of effort force on variation of spring constants for two springs, dynamic analyzes were performed by using the ADAMS software program. According to the result of the simulation analysis, new mechanism of organ type accel pedal has an inflection point of the curve of pedal effort force on variation of spring constants, k, in various range of pedal angle.



생체 이온채널 모사용 나노채널의 유동 제어에 관한 연구

김장헌, 정원석

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1242-1248

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This study presents the possibility of control of nano-fluidics in the bio-inspired nano- sized ion channel using a field effect transistor (FET) structure. We analyzed effects from main dominant factors to control the ion flow in nano-sized channel such as electro-osmosis, Diffusion effect, Coulomb force between ions and pressure force. Additionally, we suggest a strategy to control the ion flow accurately at the specific position in the nano channel by handling the viscosity, ion molecular density, pressure, gate and trans-cis voltages of FET structure.



공조시스템 개선에 따른 동절기 선실 온열환경 평가 및 유류절감에 관한 연구

한승훈, 김홍렬, 김부기

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1249-1258

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In this study, by comparing the heating performance when operating the air conditioning system that is installed directly air-cooled(heater) air conditioning central air conditioning system of the ship, with improved performance, through the actual measurement study of thermal environment of the cabin, Ship's air conditioning in the future it is intended to be used as a basic data experience of design and planning.




HCI를 적용한 복합소재 Filler 제작 장비 개발


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1259-1264

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The filler was one of the structural parts using composite material. The filler manufacturing machine was effectively developed based on the principles of usability by HCI. This machine consisted of an ultrasonic cutter, heater, forming rollers and drawing motor. It applied to separate the disk-shape cutter of ultrasonic cutter in order to remove burning the knife edge of ultrasonic cutter. And the developed machine had the two-stage forming rollers for improved formability which maintained accurately the filler shape.



강제대류에서 히트싱크의 성능평가를 위한 열해석 연구

이봉구, 이민

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1265-1271

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The heat generated by the internal electro-mechanical device is not transferred to the outside, to degrade the performance of the electronic device, or the cause of failure. Heat sinks are used to control the heat. Thermal performance of the heat sink of the pine type and pin type was analyzed using ANSYS software. The numerical results were compared with the thermal performance of the pine type and pin-type heat sink. The results of the numerical simulation showed that Pine type heat sink showed an approximately 58 percent better heat transfer rate with forced convection than Pin type heat sink.



부력식 수평형 전자동 스컴 제거장치 개발

오익수, 김봉석

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1272-1278

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In this study, the horizontal automatic scum remover with buoyant type is developed to reduce the cost of facility and is suitable for unit-process automation. This system is consist of the scum collecting box, leveling device for scum collecting box, drive device for scum collecting box, water level sensor and indicator, departure prevention device of scum collecting box, setting monitor, main control panel, etc. Performance tests for the system such as the accuracy of the scum thickness measurement, horizontal degree of the scum collecting box, scum removal time, accuracy of an unmanned control have been performed. The performance of the prototype system satisfies all the objects of this study.



회전 툴 전해방전을 이용한 측면조사형 광섬유 가공기법 연구

이호, 김창환

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1279-1284

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The optical fibers tend to have poor machinability because of its hardness and brittleness. In the previous study, we applied the electrochemical discharge machining to fabricate the tip of the optical fiber. We could machine the optical fiber using the electrochemical discharge machining however the machined optical fiber tip had rough surface. In this study, we use electrochemical discharge machining with rotation tool which of the rough-grinding and finishing-grinding process to obtain a smooth surface of the side firing fiber. As a result, we are able to machine the optical fiber tip with smooth surface effectively from the proposed fiber machining process and the emission from the side- firing fiber clearly demonstrated the directional emission as the emission beam was reflected at 80 ° relative to the fiber axis.



다단드로잉 가공에서 아이어닝과 다이패드 공법이 제품의 동심도와 측벽 두께에 미치는 영향


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1285-1291

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The side wall thickness variation of the product to the process of ironing and the die pad was studied using a progressive die of the multi-stage drawing product in the process of ironing and the die pad. Experimental results because ironing is possible to increase the side wall thickness of the product is applied to the intermediate drawing process rather than applied in the initial process. The roundness and concentricity were easy control. A die pad is applied to a stand pad to the sixth step from the first step. The seventh step and the eighth step are applied integrated pad. The integrated pad of the seventh step and the eighth step appeared to be advantageous to control the roundness and concentricity.



무선 충전기용 전자파 차폐시트의 격자 형성 장치 개발


한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1292-1299

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The purpose of this study was to develop a grid forming equipment of the electromagenetic interference(EMI) shielding sheet for use in a wireless charger. In addition, the present study was to form a lattice in the surface of the thin metal ribbon to exert an electromagnetic wave shielding performance of the precision small electronic devices such as smart phones. For this, grid forming presses such as manual pressurized press, automatic pressurized press, heat pressurized press, and continuous grid forming equipment with cylinder roll type, and a grid inspection and grid uniformity inspection devices have been developed. Finally, the cylindrical roller-type continuous grid forming equipment showed the best suited.



승용 디젤 차량에 장착된 SCR 장치의 고장 유형 분석

모준범, 정태훈

한국기계기술학회 한국기계기술학회지 제17권 제6호 2015.12 pp.1300-1305

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Diesel engines show better thermal efficiency and fuel consumption, but diesel engines typically generate more NOx emissions because of lean-burn conditions. Therefore, it is necessary to reduce the emissions of diesel engines either by efficiently controlling combustion or by employing exhaust gas after-treatment systems. In this study several problems we're observed in a SCR system and Engine control system. The analysis result, new technology SCR is suitable for the vehicle with low temperature operating condition. Through this analysis we can find out more effective repair factors from the various fault in SCR component.


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