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한국기계기술학회지 [Journal of the Korean Society of Mechanical Technology]

간행물 정보
  • 자료유형
    학술지
  • 발행기관
    한국기계기술학회 [Korean Society of Mechanical Technology]
  • ISSN
    1229-604X
  • EISSN
    2508-3805
  • 간기
    격월간
  • 수록기간
    1999~2018
  • 등재여부
    KCI 등재
  • 주제분류
    공학 > 기계공학
  • 십진분류
    KDC 550 DDC 621
제20권 제2호 (19건)
No

<학술연구>

1

가솔린-바이오 디젤 혼합조건에 따른 점화 지연 특성의 실험적 연구

이주상, 김치균, 윤상진

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.143-147

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In this paper, the combustion characteristics of constant volume combustion chamber(CVCC) were experimentally investigated when biodiesel is mixed with pure gasoline. The experiment was performed on two gasoline biodiesel samples designated by GB05 and GB20 which is mixed with 5% and 20% biodiesel respectively. It was confirmed that the ignition delay time decreases as the temperature of injection engine increases due to ignition delay. Also, it was shown that the ignition delay time decreases as the biodisel mixing ratio increases from 5% to 20%.

4,000원

2

열전소자를 이용한 냉동기의 과냉 시스템에 관한 연구

김민수, 이찬우

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.148-153

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In this paper, the performance of the Refrigerator is improved by controlling the fan speed on the condenser side or subcooling/superheating degree by superimposing the refrigerant on the inlet side of the compressor to the outlet side pipe. However, these methods may have the effect of lowering the performance due to operation of the severe condition of the main parts and may not achieve the intended performance. The Peltier Module was used to improve the performance of the refrigerator and increase the durability of the main parts through an artificial subcooling device.

4,000원

3

경량화를 위한 전기자동차 로터 샤프트의 구조해석에 관한 연구

이병호, 이창열, 정영재, 김봉환

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.154-159

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A study has been conducted on the structural analysis to reduce the light weight of the electric vehicle rotor shaft. ANSYS Static Structural was used for structural analysis. For weight reduction, the solid shaft was converted into a hollow shaft. The yield strength of the existing material SCM 440 is 655MPa, but to increase its safety, the yield strength is changed to 1,030MPa with SCM822H. At this time, weight reduction of about 47% was achieved. The resonance frequency of the rotor shaft was determined by vibration analysis and the structural safety was analyzed.

4,000원

4

초고속 선박의 저항 성능 예측을 위한 패널 민감도에 대한 연구

최희종, 문일기

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.160-165

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The purpose of this study was to investigate the resistance performance and the sensitivity of the panels placed on the free surface of the water using the potential-based Rankine source panel method. The potential-based Rankine source panel method was applied to predict a flow phenomena around a ship and the exact nonlinear free surface boundary conditions were adopted. The trim and sinkage state of the ship also were taken into account. In order to deal with complex geometries of the planing ship the panel cutting method was adopted. The R/V Athena ship was adopted as the high speed ship. Numerical analysis was carried out by systematically changing the range and number of panels in the free surface area, and the results were compared with each other.

4,000원

5

CFD를 이용한 나선형 튜브 열교환기에서 강제대류의 열유동특성에 관한 연구

이원재, 김진황, 윤준규

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.166-173

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In this study, the CFD analysis was performed by changing the geometry of coil-tube diameter ratio, coil winding number, coil pitch, and cross section of the tube to investigate the heat flow characteristics of forced convection in a helical coil-tube heat exchanger using RSM (Reynolds Stress Model). As a result, the secondary flow was developed in the tube caused by the influence of centrifugal force. It improved the heat transfer on the outer side of the tube, but on the inner side was not performed well. And the temperature rose locally in the tube region. Also the pressure drop in the tube was proportional to the diameter ratio of the coil-tube and the inlet velocity, and it was found that pressure drop and friction factor were inversely proportional. When the coil winding number and coil pitch were increased, it affected heat transfer in the low speed range of 0.1 ~ 0.2 m/s, but did not affect the flow condition after this range.

4,000원

6

이론 및 해석적 방법에 의한 터보차저 커플링 구조의 백플레이트 접촉압력 예측

홍성기, 최복록

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.174-179

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V-Coupling is used as a mechanical fastener to connect the turbine housing and the bearing housing in a turbocharger. The back plate is located between the turbine housing and the bearing housing, which is compressed by the bolt clamping force of coupling to prevent gas leakage under turbocharger operation. This paper presents the theoretical and analytical methods to predict the sealing performance by calculating the contact pressures on the back plate. The mathematical model was constructed to derive the contact force on the back plate by considering the force transfer mechanism. And, finite element analysis was carried out to predict the contact pressures by applying the bolt load in the coupling system. As a result, the analysis results of the mathematical model are well consistent with the results of the finite element analysis. Therefore, in the early design stage of turbocharger coupling, mathematical model would be helpful to determine the design parameters.

4,000원

7

디젤 엔진에서 바이오디젤 혼합연료에 따른 배기 특성 및 실험식 도출

송규근

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.180-186

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The diesel engine is excellent in economic and thermal efficiency, and is widely used as a power source for industries and automobiles. However, the problem of environmental pollution caused by exhaust gas has recently become serious and the development of alternative energy resources is urgently required due to depletion of fossil fuel. Because biodiesel is similar in properties to light oil, it is being used as fuel for diesel engines by replacing or mixing conventional light oil. As the blending of biodiesel fuel in diesel increases, the emission of harmful substances is decreased as compared with the general diesel fuel, and the supply is increasing. In this study, the effects of biodiesel fuel on engine power and exhaust gas were investigated, and empirical formulas for various NOx and Smoke exhaust gases were derived based on biodiesel blending fuel.

4,000원

8

초소수력 발전용 원통형 헬리컬 터빈의 유동해석

이창열, 김봉환

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.187-193

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This paper presents the flow analysis of flow over a cylindrical helical-blade turbine to investigate its optimum performance by varying design parameters. For numerical investigations, shear stress transport (SST) turbulence model is used. This simulation is carried out using commercial code CFX by ANSYS Inc. In this paper, the shape optimization was of turbine blades with NACA0021 performed for the vertical-axis turbine having the cylindrical shape. The influences of blade angle of attack, helical angle, and solidity on each shape are grasped. From of the flow analysis, power coefficient decreased when the helical angle was 20 degrees or more, and no electricity is produced when the solidity of 0.1. As a result of the shape optimization, the cylindrical turbine showed the highest power coefficient of 0.2733 at 3° of the blade angle of attack, 10° of the helical angle, and 0.2 of the solidity at the tip speed ratio of 1.

4,000원

9

다구찌 기법을 이용한 자동차 후면 열선의 열전달 해석에 관한 연구

류미라, 전환영

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.194-199

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A cold chamber experiment was made to continuously record defrosting process of the frosted window. To achieve this purpose, first a warm-chamber experiment(23℃) were performed to measure inner and outer surface temperature of the rear window as functions of both time and position. In this study, mutual relation of each experimental condition was derived through minimum number of experiment using Taguchi Design method and ANOVA recently used in the various fields. The optimal temperature distribution using Taguchi technique is 120 sec, heat wire size is 1.0mm, and heat wire spacing is 25mm.

4,000원

10

온수보일러를 이용한 상변화물질의 축열시스템 이용효과

백이, 강석원, 장재경, 권진경, 강연구

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.200-206

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In order to effectively utilize thermal energy, we analyzed the performance of the high efficiency latent heat storage system which can be used for greenhouse heating by using the developed phase change material. The system consists of hot water boiler, heat storage material, heat storage box, heat storage tank, circulation pump, control panel, and storage material. As a result, the latent heat and latent heat temperature of sodium acetate hydrate as latent heat storage material are 231.6 ~ 264.8kJ/kg, 54.95 ~ 55.48℃. As the number of cooling and heating increased, the latent heat temperature showed a slight change, but the latent heat decreased 33.1kJ/kg as the number of repetition increased. In the case of sodium acetate hydrate, large supercooling phenomenon was observed, and it was found that mixing of additives such as nucleating agent, thickener and supercooling agent can control the supercooling more effectively. The consumption of kerosene decreased until the temperature of the heat storage tank was raised to the set temperature by the closed circuit for 4 hours in the initial stage of the boiler operation. The heat exchange rate according to the change of the flow rate was maintained at the set temperature inside the heat storage tank after 4 hours of operation, Consumption was high. As the flow rate increased, the inlet and outlet temperature difference decreased, the heat exchange rate increased, and the heat exchange efficiency was in the range of 57.4 ~ 60.5%.

4,000원

11

The Characteristics of Durability with Biodiesel Fuel(5%) in a CRDI Diesel Engine

Hong-Seog Kim, Seung-Hun Choi

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.207-212

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Our environment is faced with serious problems related to the air pollution from automobiles in these days. In particular, the exhaust emissions of diesel engines are recognized as main causes of the air pollution. CRDI (common rail direct injection) diesel engine is widely used for the sake of minimization on exhaust emission. Because biodiesel fuel is a renewable and alternative fuel for diesel engine, its usability is expanded. An commercial CRDI diesel engine used to commercial vehicle was fueled with diesel fuel and 5% biodiesel blended fuel (BDF 5%) with city mode in excess of 300 hours. The engine performance and exhaust emissions were sampled at 1 hour interval for analysis. To check the engine parts (valve, injector), the engine was inspected after test. It was concluded that there was no unusual deterioration of the engine, or any unusual changes in engine power and exhaust emissions in spite of operation of 300 hours with BDF 5%.

4,000원

12

생체모사 소프트 그리퍼 설계 및 제작

김태연, 정광필

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.213-219

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Recently, the robotic hand sector is widely utilized throughout the entire machine industry, where gripping mechanism is gradually becoming more complex and standardized. In this study, studies were conducted to hold irregular, unstructured objects with simpler, more manageable operating principles based on compliant mechanics. In fact, it used the principle of buckling which is not commonly used in mechanical design to provide stable grasping force without giving any damage to objects with uncertain magnitude and rigidity. By using CFM(constant force mechanism) based on the principle of buckling, the force of the object and the contact surface is fixed evenly across the segments, providing a stable grasping force to the object. Also, a bar that serves as a linear guide prevents the hand from buckling to unwanted direction gives elaboration to the hand. With a simpler principle, the lower unit price and higher applicability, there is little friction in the mechanism, and it focused on creating a lightweight hand, which have significance for about 90% of excellent gripping performance.

4,000원

13

Aluminum-6061과 Aluminum Foam을 샌드위치 구조로 적층한 MT(Middle Tension) 시험편의 해석적 연구

박재웅, 조재웅

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.220-225

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Light weighting is one of techniques considered importantly at designing the mechanical structure using the light weight material. This study deals with aluminum-6061 and aluminum foam which stood in the spotlight of light weight material. And the finite element method for safety evaluation has been carried out in order to prevent from the damage and fatigue fracture due to crack appearing at the mechanical structure with this material. The simulation analysis as MT(middle tension) test was carried out by using the core of aluminum foam and the material laminated with sandwich structure of Al-6061. The mechanical structure is linked together with various parts and designed as the material with hole or crack. So, MT test is one of the test methods to evaluate the fatigue fracture characteristic of material and the strength inside material with the center crack by applying the load to the part connected pin. The real material strength is thought to be evaluated through the study result of MT test analysis.

4,000원

14

디젤기관에서 바이오디젤유 및 함산소성분 적용 연구

최승훈, 김홍석

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.226-231

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, the potential of biodiesel fuel and oxygenated fuel (ethylene glycol mono-n-butyl ether; EGBE) was investigated as an effective method of decreasing the smoke emission. The smoke emission of blending fuel (EGBE 0~20 vol-%) was reduced in comparison with diesel fuel and it was reduced approximately 64% at 2000 rpm, full load in the 20% of blending rate. But torque and brake specific energy consumption (BSEC) didn't have large differences. Also, the effects of exhaust gas recirculation (EGR) on the characteristics of NOx emission has been investigated. Consequently, it was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel and oxygenated fuel(10%) and cooled EGR rates (5~10%) in a DI diesel engine.

4,000원

15

주제어밸브의 최적설계에 관한 연구

이태근, 민상기, 김대호

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.232-237

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The various hydraulic equipments including main control valves are composed of relatively long replacement parts, so the stability is very important. These systems ensure system safety by not delivering pressure to actuators when pressure exceeds the limiting pressure. According to various hydraulic equipments, the required pressure of every hydraulic actuators are differenced. So the optimal design of the main valve is indeed needed. In the previous study, the detail shapes and the boundary conditions of the main control valve were studied by CFD analysis using FLUENT. Based on the previous study, the optimal design of the main control valve is done by applying the parametric modeling technique and then the optimum design of the main control valve is investigated by CFD analysis.

4,000원

16

선형변환을 적용한 선박 최적설계 기법에 관한 연구

박창규

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.238-245

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This paper describes a preliminary ship design optimal design method in the process of hull form design. In the deterministic approach, an interdisciplinary ship design method integrates principal dimension decisions and hull form variations in the preliminary ship design stage. Integrated ship design, as presented in this paper, has the distinctive feature that these parameters are evaluated simultaneously. Conversely, in sequential design, which is based on the traditional preliminary ship design process, hull form designs and principal dimension decisions are determined separately and sequentially. The current study adopts the first method to enhance the design quality in the early design stage.

4,000원

<생산기술>

17

궤도차량 ISU 작동유 누유 메카니즘 규명 연구

김형현

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.246-252

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ISU (In-arm hydropneumatic Suspension Unit) are popularly applied to recently developed tracked vehicles because of better performance of ISU than the one of the conventional HSU (Hydraulic Suspension Unit). However, function deterioration and malfunction phenomena of the several ISUs were observed due to leakage of hydraulic fluid during operation of the tracked vehicles. The objective of this study is the investigation of fundamental leakage mechanism of hydraulic fluid for the ISU. The leakage mechanism was investigated by comparing both results of the technical data analysis and overhaul inspection of the ISU which occurred leakage of hydraulic fluid. Finally, the leakage mechanism found in the current investigation was verified by using experimental methods.

4,000원

18

군용 소형트럭 조향기어박스 브래킷 균열에 따른 내구도 개선방안 연구

김선진, 박진원

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.253-260

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The purpose of this study is to improve the durability by solving the crack problem of the steering gearbox bracket welded to the frame assembly. For the exact and effective analysis, we use charac- teristic(fishbone) diagram from the viewpoint of 4M1E. Through this analysis it was identified two kinds of problems, and develop improvement plan for it. Verification tests must be performed to confirm the improvement. So, the test method for steering gearbox bracket improvement was newly established by referring to similar case. As a result of the tests for verification, the stresses at crack point are decreased and the durability was improved about 2.6 times compared with product before improvement.

4,000원

19

공간 확장형 캠핑 트레일러 구조의 개발

이삼철, 권오성

한국기계기술학회 한국기계기술학회지 제20권 제2호 2018.04 pp.261-266

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The size of the camping trailer will bring the area of the camping trailer more space. The various types of expandable RV or camping trailers are available to ensure a wider camping space. In this study, we aim to provide technology to produce new types of products. This will ensure a wide range of camping space while, also, facilitating mobile traction, which includes the development of functional, convenience, and aesthetic product design. This will satisfy a wide range of consumer and their diverse needs. As a result, the body weight of less than 500 kg was achieved by weight in the design and manufacturing process of the product. Consumers will be satisfied because they can obtain an abundant amount of camping space.

4,000원

 
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