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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
    1999~2019
  • 등재여부
    KCI 등재
  • 주제분류
    공학 > 기계공학
  • 십진분류
    KDC 550 DDC 621
제18권 제5호 (29건)
No

<학술연구>

1

단하지지지기에 작용하는 지면반발모멘트 계산

고대환, 송성재

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.645-650

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Three-dimensional motion analysis systems and force plates are used for gait phase detection and ground reaction force(GRF) or ground reaction moment(GRM) data collection. But force plates as measurement systems are restricted to laboratory environments and have limitations for abnormal walking with foot dragging. Therefore the methods were proposed to compute the GRM from the kinematic data of three-dimensional motion analysis systems. Gait phase detection with kinematic data using foot velocity algorithm(FVA) was performed. The validity of gait phase detection was obtained comparing with the results of force plates. A gait model with 7 segments was composed to compute GRM. The results of gait model with kinematic data were compared with those of force plates. The result of the vertical direction is similar. But anterior-posterior direction and lateral direction show similar tendency with some gaps.

4,000원

2

태양광 보조발전을 적용한 친환경 하이브리드 전기 UTV 시스템 개발

김기주

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.651-656

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The limitations and problems of the rechargeable battery and short mileage per one electric charging have not been overcome at the electric vehicles. To solve these problems, the hybrid vehicle has been developed by securing the performance of automotive with the conventional internal combustion engine and the environmental benefit. Meanwhile, the electric UTV (utility terrain vehicle) which has this environmental benefit has been widely used for factories, parks, leisure and agricultural areas. In this study, the electric UTV was fabricated and attached the auxiliary power drive systems including the photovoltaic power generation system into this electric vehicle in order to make up the hybrid (motor + photovoltaic) vehicle system. As the range of the hybrid UTV would be extended over 20% than that of the existing golf cart per one electric charging through this successful development, the dynamic stiffness was improved through light-weight body design.

4,000원

3

가스 스프링 Elevation 동작 마찰력 보상 연구(1) - 관형 오리피스 단면 및 가스씰 조임 기술 개발

이정익, 여문수, 고병갑

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.657-664

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In this study, factors analysis is performed for reducing friction in elevation motion of a large television stand over 50-inch. The first is a pipe type cross-section control for accurate position control of the piston rod. Here, it was compared with the pipe type and labyrinth type orifice cross-section. The second study attempted to reduce the frictional force the gas seal lip technology. As the result of the first study, in the orifice cross section study between pipe type and labyrinth type through CAE and experimental consideration, cross section of labyrinth type orifice is preferred for reducing of friction. As the result of the second study, in the gas seal lip technology, the outer-inner diameter of φ20×φ8 in the test result of hollow rod is revealed more proper if the weight of 50 inch television assumed as 30kgf.

4,000원

4

400km/h급 전차선로용 드로퍼의 기계적 피로 수명 평가

조용현, 이기원

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.665-673

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Mechanical fatigue tests which consist of an alternate load and compression cycle show that droppers for 400km/h operation have cyclic mechanical strength of 300N with compression amplitude 0.05m. Numerical simulations for forces on the dropper during the passage of a train tell that dynamic forces can be varied up to 15% due to installation tolerance. Taking into account of the 15% variation, we end up with the maximum allowable peak load of 260N for the dropper. Peak value of measured forces on the dropper at the speed of 400km/h is 152N, which is less than the maximum allowable peak load of 260N. Conclusively, the possibility of fatigue fracture for the dropper is quite low.

4,000원

5

곡면 마찰교반접합에 따른 Al 5083의 맞대기 접합부 기계적 특성에 대한 연구

김영곤, 김인주

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.674-679

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In this study, the curvature FSW experiments were performed with the 2 mm thickness of Al 5083-O using by the 5 axis(X/Y/Z/A/C) position control system. For the mechanical test of the butt joints, the tungsten heavy alloy as the tool material without necessary after finishing the heat treatment such as quenching was used. In particular, the insertion depth and the welding speed was changed at the constant rotation speed in order to select the optimum FSW condition. The test results were visually satisfactory for the approximate joint length of 300 mm. Sound joint was formed at the condition of 1.9 mm-1000 rpm-100 mm/min and its tensile strength of joint was the most high almost the same as that of the base material.

4,000원

6

소수력용 구형-헬리컬 터빈의 구조적 안전성 평가

김행곤, 이창열, 김봉환, 이정언, 조은만

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.680-686

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The objective of this study is to evaluate the structural safety of the spherical-helical turbine for hydro-power. We analyze fluid-structure interaction of the spherical-helical turbine for hydro-power using ANSYS-CFX and Mechanical. The maximum combined stress, deformation and safety factor of the spherical-helical turbine in cases of three types of materials were obtained by fluid-structural analysis. From structural analysis, the maximum value of the equivalent stress occurred at the shaft of the turbine for three material types. In case of a polyethylene turbine blades, the maximum equivalent stress and safety factor were 3.46 MPa and 7.23. Polyethylene turbine blades were evaluated to be safe except of the turbine shaft. Several researches will be performed based on the results of this study and more research and development of technologies are needed in this field.

4,000원

7

E-4WD 하이브리드 시스템의 구동성능 개선을 위한 모터감속비 영향도 분석

유셈이, 임원식, 최우석

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.687-693

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To overcome recent emission regulation, various hybrid systems are being developed. In the E-4WD(electric four wheel drive) system, the engine and transmission drive the front wheel, electric motor and single reduction gear drive the rear wheel. As the gear ratio of the reduction gear set determines the electric motor's operating point, the gear ratio is important to enhancement efficiency of hybrid system. This study is to analyze motor reduction gear ratio's influence on E-4WD hybrid system for optimized efficiency and driving performance. Fuel economy, operating point of power source and hybrid mode are analyzed using simulation developed with dynamic programming method.

4,000원

8

CAE 정적해석을 통한 자동차용 Torque Strut의 내구 안전 설계

김기주

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.694-699

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The vehicle weight and alternative light materials development like aluminum alloys are hot issues around the world. In order to obtain the goal of the weight reduction of automobiles, the researches about lighter and stronger suspension links have been studies without sacrificing the safety of automotive components. Therefore, in present study, the structure analysis of the torque strut links made by aluminum alloys (A356) was performed by using CAE (computer aided engineering) to investigate the light weight design process from the reference of the rear suspension torque strut link which was made by STKM11A steel and was already proven in the commercial market. Especially, the simulated maximum von Mises stresses after strength analysis were normalized as fatigue limit and these were converted to the WF (weight factor) of the same type as the fatigue safety factor suggested and named like that in present study. From these, it was suggested that the fatigue properties of the torque strut could be simply predicted only from this static CAE simulation.

4,000원

9

PC 기반의 항공기 시뮬레이터 개발

진재현, 성태현

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.700-706

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Aircraft simulators are very useful tools to study aircraft behaviour and to develop flight control systems. Nowadays, these simulators are used for UAV's development. In this paper, a PC-based aircraft simulator system is developed by the LabVIEW software. It consists of a simulation program run on a computer, an input stick, and a control surface. The simulation program calculates aircraft dynamics and displays aircraft motion by a 3D graphic object. The program measures the movement of the input stick and rotates the control surface as commanded. The simulator system has been demonstrated by several simulation tests. The system will be used for UAV development.

4,000원

10

난류 자기유체역학 유동 예측을 위한 난류모형의 평가와 개선

신종근, 곽동걸

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.707-714

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The characteristics of the turbulent MHD channel flows are analysed within the elliptic blending k -  model. The evaluation of additional terms representing the MDH interactions in the transport equation for the turbulent kinetic energy and dissipation rate is carried out firstly. And then, the improvement of model coefficients for the additional terms is achieved. Regardless of the magnetic field orientation, perpendicular and parrel to the main flow, the model coefficients for the additional terms are not changed to maintain the generality of the present model. The prediction results are directly compared to the DNS data to assess the performance of the present model.

4,000원

11

실험적 규명을 통한 적층각도가 적용된 CFRP 삼점 굽힘 시험편의 파괴거동평가

황규완, 조재웅

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.715-720

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In order to provide the basis data for broad use and safe design of carbon fiber reinforced plastic, this paper aims at investigating the fracture behavior on CFRP specimen composed of one directional fiber through three point bending test. On the basis of experimental result, the improvement of composite layer specimen can be secured with the other data to compare the existing specimen. The fracture behavior happened at the experimental procedure is investigated in this study. The maximum loads of 1200 N, 1700N and 1600N are shown respectively at the specimens with the layer angles of 30°, 45° and 60°. The highest load is shown at the layer angle of 60° among all specimens and the longest displacement is maintained until each of the layer structure is broken down. The fracture due to the force applied from the outside can be prevented by applying the result of this study to the real structure. As structural safety can be evaluated and anticipated through this study, it is thought that the safe design is devoted.

4,000원

12

가스 스프링 Elevation 동작 마찰력 보상 연구(2) - 관형 오리피스 단면 및 피스톤 로드의 부피 보상 장치

이정익, 여문수, 고병갑

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.721-728

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In this study, factors analysis is performed for reducing friction in elevation motion of a large television stand over 50-inch. The first is a pipe type cross-section control for accurate position control of the piston rod. Here it was compared with the pipe type and labyrinth type orifice cross-section. The second study is for specification decision and volume compensation experiment as an apparatus for compensating of the volume of the cylinder is compressed as the volume of piston rod. Consequently, in the orifice cross section study between pipe type and labyrinth type through CAE and experimental consideration, cross section of labyrinth type orifice is preferred for reducing of friction. The result of total consideration in stability problem and performance of volume compensation for specification decision and volume compensation experiment is determined the final speculation of hollow rod φ8×φ4 and riveting system.

4,000원

13

Liquid Crystal Alignment on Ion-beam Irradiated Hafnium Strontium Oxide Films

Myung-Hyun Cho, Ho-Young Lee, Chan-Ju Jung

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.729-733

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Homogeneous liquid crystal (LC) alignment on hafnium strontium oxide (HfSrO) films prepared by sol-gel process via ion-beam (IB) bombardment was investigated. Uniform LC alignment was achieved on the IB-irradiated HfSrO films at IB intensity of 1.8 keV. We confirmed the effect of surface morphology on LC alignment using field-emission scanning electron microscope (FE-SEM). In addition, we observed electro-optical characteristics of the twisted-nematic (TN)-LC cells based on HfSrO films to verify the possibility of LC display (LCD) application.

4,000원

14

터보차저 터빈의 회전수 변화에 따른 유동해석

김건형, 이동렬

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.734-739

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Recently, car industry trend is downsizing, a lean-burn engine, green car and cost cutting. A turbocharger is the key components to improve fuel efficiency and power. This research is to study on the flow analysis in the performance analysis for change rotating speed of turbocharger turbine with three different rotating speed in the turbine. After measuring real design features, modeling, velocity distribution, pressure distribution and temperature distribution are conducted numerically. Torque and power are compared with three different cases in order to analyze the performance for turbine. Finally, optimum power is determined with the sequence of case 1, case 2, and case 3.

4,000원

15

Dynamic analysis of the turbine blade in a clamp for the identification of the frequency responses and mode shapes at ultrasonic frequency range

Bu-Byoung Kang

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.740-745

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One of the important advantages of Thermosonics is that it can be applied to complex structures such as a turbine blade as a convenient and quick screening test method. For a reliable thermosonic test, the vibrational characteristics of the system comprising the tested structure and the clamp at ultrasonic frequency range should be identified. Therefore, this study presented the analysis results of frequency response functions and mode shapes of the turbine blade and clamp system and investigate the possibility of the reliable excitation system for the thermosonic test.

4,000원

16

복합재를 적용한 경량화 절연 텔레스코픽 붐 개발

김진수, 이학현, 국호형

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.746-752

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When working on electrical wiring and cable, Electrically insulated aerial work platforms must be used to prevent the electrocution hazards. Aerial work platforms with composition boom is able to increase the weight and height of the workspace due to the lightweight of boom. The aim of this paper is to clarify structural stability of 3 stage telescopic booms having an operator platform and an upper boom of composition(Fiber Reinforced Plastic) by comparing the general telescopic booms with steel material using computational analysis.

4,000원

17

디젤엔진 배기폐열회수용 유기랜킨사이클의 작동유체에 관한 성능해석

유환주, 백동훈, 김영범, 이수룡

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.753-758

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The performance of organic Rankine cycle was numerically investigated to recover heat from the exhaust of a heavy-duty diesel engine. Exhaust flow rates and temperatures are obtained from the simulation of diesel cycle by using GT-Power. The net power outputs of organic Rankine cycle for 9 working fluids were calculated by cycle simulations. The results showed that as for the net power outputs and the pressure of working fluids, R21 and R245fa are suitable as working fluids for ORC in diesel engine.

4,000원

18

양쪽에 노치들을 가진 시험편의 재료 강도에 대한 평가 및 검증

이정호, 조재웅

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.759-764

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Composite materials have the strong durability and light weight as inhomogeneous material. These material are manufactured by combining and maximizing the advantage of each material. Among these various materials, stainless steel, aluminum and brass has been used generally. Prior to using, the preparatory experiments are demanded in order to obtain the material strengths. In this study, the tensile tests are carried out with the specimens of stainless steel, aluminum and brass. These tensile specimens of same standards are made with the notches at both sides of specimen. When the forced displacement of about 11 mm proceeds in case of stainless steel specimen, the maximum load of 31000 N is shown simultaneously with the fracture of specimen. When the forced displacement of about 6 mm proceeds in case of aluminum specimen, the maximum load of 20600 N is shown simultaneously with the fracture of specimen. When the forced displacement of about 7 mm proceeds in case of brass specimen, the maximum load of 25000 N is shown. In this study, the finite element analysis as ANSYS program is carried out in order to verify these experimental results. The experimental and analysis results are similarly shown each other. Through the result of this study, the analysis data with no experiments are thought to be trustworthy as the tensile experimental data.

4,000원

19

가솔린-에탄올 혼합연료를 사용하는 SI 엔진의 성능 및 NOx에 관한 연구

백동훈, 이수룡

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.765-770

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The effect of gasoline-ethanol blends on performance and NOx emission was investigated in a SI engine with port and direct fuel injection systems. The 1-D cycle simulation program of GT-Power was utilized to analyze the performance of thermodynamic cycle. The results showed that the brake torques are increased with the addition of ethanol to gasoline because of the improvements of volumetric efficiency. The engine with direct ethanol blends injection system has more power than that with port gaoline injection system, which is caused by the higher latent heat of ethanol.

4,000원

20

소형 가스터빈의 입력 RPM변화에 대한 성능해석에 관한 연구

송룡수, 이동렬

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.771-776

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In this study, we analysed the influence of the flow and performance of the generated micro gas turbine with different rotational speeds. CFD analysis was also performed using commercial code called ANSYS CFX 14.5. It adopted the turbine of radial flow type suitable for power generation for small rotating equipment. The number of blades was designed with each radial turbine 8, vane nozzle 14. The boundary layer flow analysis was widely used to the SST model. Mass flow rate of the turbine was 1.45 kg/s. While the rpm varies from 38,000rpm to 48,000rpm under various boundary conditions, the distributions of Mach number and pressure were numerically analyzed for electric power output, turbine isentropic efficiency. We analyze the inlet pressure, outlet temperature, electric power output, turbine isentropic efficiency. It compared maximum and minimum revolution through CFD analysis. Power output of maximum revolution has been increased 18% more than minimum revolution. Isentropic efficiency of maximum revolution has been increased 16.5% more than minimum revolution. Therefore, maximum power output was 332kW, amaximum isentropic efficiency was 33.2%.

4,000원

21

승강기용 안전장치 개발에 관한 연구

김동균

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.777-782

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In this study, the elevator safety device was investigated analytically. It is the only safety device that can lift the brake in an emergency situation. When the safety device is in contact with the guide rail and the brakes applied, the structure can be stopped due to the friction occurring between them. Study on the shape of the portion contacting the safety device and the guide rail wedge directly were performed based on four cases. Each cases were classified according to the contact conditions. The contact conditions are mainly line contact, surface contact, and point contact. According to the contact conditions, the frictional stress due to the forced displacement that occurred during the elevator braking is also considered. For the perpendicular guide rail and sliding distance, the braking force shows excellent results for the line contact conditions. The results also showed less distribution.

4,000원

<생산기술>

22

마늘종구 직립파종기 개발을 위한 크랭크-링크기구 개발

엄용균, 이인재, 김봉윤

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.783-788

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The quality of garlic productions and reduction of labor cost which are important to overcome price competition against import garlic. Improving to the quality of garlic production and reducing of labor cost, The garlic seed must be planted with the downward positioning of garlic seed root. This research was conducted to develop a crank-link mechanism for planting garlic seed with the downward positioning of garlic seed root. Computer simulation was conducted for developing a crank-link mechanism. A prototype of developing crank-link mechanism was manufactured and laboratory tests was performed. As results, Followings are achievements in range of plant depth = 50~70 (mm) with tolerance depth 3 mm, planting hole size = 45×50 (mm) with tolerance size 5 mm at planting speed 0.3 m/s.

4,000원

23

메시 튜브를 이용한 4방향 전동 연성내시경 개발

송성재

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.789-793

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The electric flexible videoscope was developed. The developed components of the videoscope are insertion tube, 360 degrees full articulation tip with joystick control, detachable probe part, camera module equipped with CMOS sensor and adjustable high-intensity white LED light sources. The insertion tube can have strong torsional rigidity from the components of spiral spring and tungsten mesh tube. The handset with joystick control makes it possible to manipulate the videoscope tip articulation in 360 degrees of all directions easily. Over 90 degrees of bending angle measured from the straight camera probe makes it possible to inspect the surface of side wall. The detachable probe model can separate insertion tube with probe. It is useful to select proper length of insertion tube. Several tests were performed to check the development objectives.

4,000원

24

블루베리 예냉기의 개발과 적외선 온도계를 이용한 적용성 검토

박경주

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.794-799

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Blueberries are popular early summer fruits. While high temperature in the harvest period induces ripeness of fruits, increases tidal volume and cause reducing their hardness. This result in weight reduction and deterioration of fruits. So, controling temperature of harvested fruits is important to keep storage quality and shipping quality. To decrease the temperature of harvested fruits, we made a precooler using differential pressure method. With infrared thermometer we measured the temperature change of harvested fruits and reviewed the application and utility of the precooler.

4,000원

25

고등훈련기 환경제어계통 벤트튜브 개선 연구

조연식, 유영수, 김명호

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.800-805

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This paper is about improvements to prevent the crack on welding parts of bleed air duct and vent tube in Advanced Trainer ECS owing to vibration. The configurations and the path of vent tube should be changed to prevent the crack. To assure the result of improvements, measured the status of each pressure condition attaching pressure censers on duct and vent tube. The result of life analysis shows that a crack does not happen on improved configuration while a crack initiates after 19th flight and thru cracking could happen after the 30th flight on previous configuration.

4,000원

26

Unmanned Ground Vehicle의 이중축 구동 메커니즘 개발

오연택

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.806-812

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The paper presented the driving mechanism structure of unmanned ground vehicle. The most fundamental feature of mobile platform has the transformable crawler. The crawler system transforms the shape of the track based on a driving mechanism. By adopting a double shaft structure to simply the crawler system was UGV platform. A automatic transmission is built to increase driving torque of unmanned ground vehicle. Available driving modes include a speed mode to drive at top speed on flat surfaces and a torque mode to handle uneven terrain, obstacles and stairs. The double shaft Also UGV platform was tested on uneven surfaces including muddy, sandy, and gravelly terrain. The UGV platform has shown good results in the driving test.

4,000원

27

다련장 발사대 고각구동 클러치 마찰 소음 저감에 관한 연구

이형준, 김종식

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.813-818

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A precise control of the launcher in MLRS(Multiple Launcher Rocket System) is important for a mission completion. During the field operation of the MLRS, a friction noise was heard in the elevation clutch that controls the launcher. It was confirmed that unsteady friction between friction plates and clutch plates has caused the noise in the clutch. Conducting the analysis of drive mechnism in the clutch, there was a possibility of the unsteady friction because of moderated spring constant. Therefore, after performing experiments on the elevation clutch varied with spring constant, it was determined the proper spring constant. Finally, an improvement on the spring constant in the elevation clutch is expected in the future by utilizing the result of this study.

4,000원

28

콘크리트 단위수량 측정장비의 개발

안영명, 이영진

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.819-826

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We have developed a DH-PROTO equipment to measure the Unit-Water Content of concrete. In this paper, using an accredited certification HI-330 and developed DH-PROTO to measure the Unit-Water Content, it was evaluated by comparing the measurement stability. In experimental results by using a capacitive equipment DH-PROTO and HI-330, Estimation error of DH-PROTO and HI-330 according to the type of binder is -4.4 to 2.0%, -7.4 to 4.0%, measuring equipment for Unit-Water Content in concrete showed excellent performance in reliability assessment measures. Also, the estimation error according to the type of fine aggregate was appeared to 3.4~10.4 % and 2.8~9.1%, was determined that excellent performance and accuracy levels with it. Thus, it expected to be released as a commercial product through further studies.

4,000원

29

회전형 다면 석재 재단기 개발에 관한 연구

김장헌, 이현우, 조상환, 조현, 정원석

한국기계기술학회 한국기계기술학회지 제18권 제5호 2016.10 pp.827-832

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This study presents the stone cutter design that can rotate and change the cutting side of the stone automatically by the combination structures of the rotatable and foldable plates. Foldable plates are consisted with the iron plate and the hydraulic cylinders system(1500W pump power) which can generate high pressure to raise the plates and the stone. Additionally, rotatable plates are designed by gear system which has high gear ratio(1:8) for rotating heavy stone(5ton) easily. We analyzed the movement of the stone and investigated the total system of the stone cutter including a rotator and a tilter. Moreover, we constructed a control board to control the system accurately. This system can induce high quality cutting process controlled within errors of 5% and also reduce the process time from about 20 min to 90 sec by the automatic system.

4,000원

 
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