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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
제15권 제3호 (22건)
No

〈학술연구〉

1

노후 차량 연비향상을 위한 전자제어 파형 인자에 관한 실험적 연구

김철수, 유종식

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.319-324

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This paper is on developing the advanced method in diagnosis electronic control of gasoline and LPG engine. The experimental methods using oscilloscope were employed to measure waveform of hot wire, hot film, oxygen, ignition coil and injector. Through these analysis, emission reduction and fuel economy improvement were expected by depict vehicles. The experiment was carried out during no-load condition. A summary of the important results are as follows. 1. The factors affecting the secondary ignition waveform from the primary ignition waveform were reverse surge voltage and induced voltage . Actually shape of primary ignition waveform was normal, but a secondary ignition waveform was measured badly. 2. The area of the voltage-time diagram of secondary ignition waveform means the value of the effective discharge of energy. This value is negative, the fuel economy could be predicted badly and is positive, good value of fuel economy could be predicted. 3. Inspection and maintenance of DLI ignition vehicles compared to DIS ignition vehicles were essential. The secondary ignition waveform of the C type vehicle were worst compare to those of the different type vehicles. The injection duration of injector was largest C, D types in the order named, was shortest E, F type. As a result, E, F type are most effective among Gasoline vehicles.

4,000원

2

조향기어비 가변 및 능동 조향에 의한 차량 요 거동 안정화

최주용

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.325-330

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Active front steering(AFS) system is able not only to vary steering ratio between steering wheel and tire wheel but also to steer front tires independently. In this paper, steering gear ratios and an active steering algorithm are proposed for the AFS system. Steering gear ratio is a function of vehicle speed and steering angle. Active steering is generated when the error of yaw-rate is larger than some threshold. To verify the performance of yaw stability, hardware-in-the-loop simulation system is made up of column type active steering system, driving display, steering effort reaction system and controller

4,000원

3

Study of Converter Topologies for a Low-Cost, High-Efficiency Two-Phase SRM Drive

Hyungjun Park, Jaehyuck Kim

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.331-337

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This paper describes study of the converter topologies for a low-cost, high-efficiency switched reluctance motor(hereafter abbreviated as SRM) drive. The considered converter employs two-switch split AC supply configuration. The converter preserves a single switch per phase as well as a single phase-leg rectifier circuit realizing the fewest component count to achieve a highly cost effective solution for two-phase SRM drive. Comparative study between the considered converter and other converters are provided. Analysis of the modes of operation and mathematical modeling are also provided. Analysis and simulation results are provided to validate the converter. The considered split AC converter can be a strong candidate for low-cost applications such as power tools, fans, and small appliances where both cost and efficiency are most valued.

4,000원

4

알루미늄 폼의 충격특성에 대한 유한요소해석

조호선, 조재웅

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.339-344

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New material which absorbs impact energy effectively and has excellent mechanical property is developed. The used amount is increased at automobile field day by day. Aluminum foam with various air sell lattices within is one of representative porosity metals which are used at many automobile parts because it has the excellent lightness and impact energy absorption function. For this reason, aluminum foam is used widely as a component among composite materials. This study aims to investigate systematically the mechanical property of foam through computer simulation. In order to obtain the property of aluminum foam, aluminum foam is designed as the dimension of 100mm × 100mm × 25mm and the striker that has the diameter of 12.5mm is supposed to impact aluminum foam with impact energies of 6J, 10J, and 14J. Aluminum foam is not penetrated when striker given by energy of 6J or 10J impacts into it, but aluminum foam is penetrated by striker in case of impact energy of 14J. The result can provide the basic data in order to develop the advanced composite material.

4,000원

5

친환경 자연냉매를 이용하는 2단압축 2단팽창 냉동시스템의 성능예측

노건상

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.345-350

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In this paper, cycle performance analysis of two-stage compression and two-stage expansion refrigeration system using Natural refrigerants is presented to offer the basic design data for the operating parameters of the system. Alternative natural refrigerant R290(Propane), R600(Butane), R717(Ammonia), R1270(Propylene) for freon refrigerant R22 were used working fluids in this study. The operating parameters considered in this study included evaporation temperature, condensation temperature, subcooling degree, superheating degree, and mass flow rate ratio of inter-cooler. The main results were summarized as follows : The COP of two-stage compression and two-stage expansion refrigeration system increases with the increasing subcooling degree and mass flow rate ration of inter-cooler, but decreases with the increasing evaporating temperature, condensing temperature and superheating degree. Therefore, subcooling degree, mass flow rate ratio of inter-cooler of two-stage compression and two-stage expansion refrigeration system using alternative nreon refrigerants have an effect on COP of this system.

4,000원

6

목발형 전동 1륜 구동 보행보조기에 관한 연구

김진수, 임수홍, 신연재

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.351-356

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This paper aims to develop a crutched walking frame with one-wheel driving system for the walking-impaired person as the aged. The walking frame is made up of four main parts : the steering and suspension system, the driving unit using the worm gear, the sensor and the controller. The walking frame can be controlled to keep the stable attitude by using the tilt sensor that measure the tilting of frame. The experimental results without control motion and with control motion for the downhill and uphill are presented in this study. Finally, a comparison between these results is presented to show the validity of system.

4,000원

7

파괴방수차 붐 및 아웃트리거의 구조적 안정성에 대한 연구

하벼리, 장병춘, 백일현, 김영군, 박경민, 소수현

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.357-363

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As fires have frequently occurred with large scale at cultural assets and warehouses, the development of Korean type demolition fire apparatus for efficient fire fighting becomes important. In this study, structural stability is investigated for assembly model of boom and outrigger by using computational structural analysis. Analysis results of boom and outrigger unit are also compared with assembly model. As this study result, equivalent stress result of boom unit is about 6% higher than assembly model and equivalent stress result of outrigger unit is about 15% higher than assembly model.

4,000원

8

Design of a Low-Cost Converter for a Two-Phase SRM

Jaehyuck Kim, Hyungjun Park

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.365-371

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This paper describes the design and implementation of the split AC converter topology for a low-cost, high-efficiency switched reluctance motor (hereafter abbreviated as SRM drive. The considered converter employs a low-cost, single-switch-per-phase configuration. as well as a single phase-leg rectifier circuit realizing the fewest component count to achieve highly cost effective solution for two-phase SRM drive. The design of the prototype converter as well as comparative study with the conventioal asymmetric converter is discussed. The converter is validated by both simulation and experimental results.

4,000원

9

접착제로 접합된 알루미늄 폼의 전단 강도 평가에 대한 시뮬레이션 해석

조호선, 조재웅

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.373-377

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Aluminum foam has many superb properties such as light weight, impact absorption and thermal resistance by comparing with original metallic materials. Composite materials made of aluminum foam have used at various fields as automotive bumper, shock absorption, vessel and aircraft. But it is inefficient to join aluminum foam with bolt and nut because of the property of light weight. In this study, this approach is investigated by joining aluminum foam with adhesive. Impact fatigue and failure toughness at the commissure of adhesive structure are studied by simulation analysis. This study aims to investigate the shear strength evaluation at shear mode of adhesively bonded joint with double cantilever beam(DCB) made of aluminum foam.

4,000원

10

저비중 SMC의 유동해석을 통한 최적화 공정설계에 관한 연구

김은성

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.379-384

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The SMC(Sheet molding compound) process is widely used in the automotive industry to produce parts that are large, thin, lightweight, strong and stiff. Compression molded parts are formed by squeezing a glass fiber reinforced UP(Unsaturated Polyester) sheet, known as sheet mold compound(SMC), between two heated cavity surfaces. This paper has performed flow analysis to predict optimization process of low density SMC. After five types of design variables and six types of response variables were defined, DOE(Design of Experiment) and RSM (Response Surface Method) were applied in order to measure sensitivity of design variables and realize optimization through regression model. After design optimization, the total warpage of the SMC is reduced by about 12% compared to the initial design of SMC and cure time, cure temperature, clamping force and flow pressure are decreased by 0.6∼27% in comparison with the initial design. By doing this, the production costs could be diminished.

4,000원

11

나선형 홈이 파인 튜브형 EGR Cooler 성능에 대한 수치해석

이건화

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.385-390

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In this study, the performance characteristics of EGR Cooler applying to the current commercial vehicle was analyzed by the numerical analysis. Through the experiment the performance evaluation of EGR Cooler must need a lot of time and expenses. On the other hand, the numerical analysis has been used in many research areas as a way to reduce the cost and time. The analysis model of this study has a spiral shape tube. The exhaust gas passes through the inside of the tube. The performance of Cooler was analyzed according to the variation of gas mass flow rate. The results of analysis and experimental was confirmed that was indicating the same trend.

4,000원

12

간접분사방식 기관에 대한 연료와 배기가스재순환의 적용

김은성, 이상근

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.391-394

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The smoke emission of biodiesel fuel was reduced remarkably in comparison with diesel fuel, that is, it was reduced approximately 36% at 2000rpm, full load condition. And, power, torque and brake specific energy consumption showed no significant differences. However, NOx emission of biodiesel fuel was increased compared with commercial diesel fuel. Also, the effects of exhaust gas recirculation(EGR) to reduce the NOx emission has been investigated. It was found that simultaneous reduction of smoke and NOx was achieved with biodiesel fuel(20vol-%) and cooled EGR method(10∼15%).

4,000원

13

고출력 LED의 냉각특성에 관한 실험적 연구

이철재

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.395-400

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LEDs are increasingly used for many applications including automotive, display and special lighting applications. The performance and lighting characteristics of the LED depend on cooling condition because the power LED generates lots of heat. In this study, the effect of the generated heat from power LED module on cooling characteristics and performance is measured and evaluated. For experiments, the transient temperature of a power LED module with cooling condition is measured.

4,000원

14

타원혼합 방정식을 사용하는 k-∈-v2 난류모형 

신종근

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.401-406

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This study describes the amendment of Durbin's k-∈-v2-f model and its application to turbulent channel flow to test the model’s performance. Modeling redistribution and dissipation rate terms for the scalar v2 transport equation is considered by the elliptic blending equation which is used in the second moment closure generally. The prediction results are directly compared to the DNS and Durbin's original k-∈-v2-f model to assess the performance of the new model predictions and to show their reasonable agreement with the DNS and Durbin's model for all the flow characteristics that are analyzed for the present study.

4,000원

<응용역학>

15

EPS 타입이 스티어링 성능에 미치는 영향

유충준

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.407-413

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Electric power steering system(EPS) is a new power steering technology for vehicle and important device for improving vehicle’s dynamics and static performances. EPS can be divided into the following three forms: the Column assist type EPS(C-EPS), the Pinion assist type EPS(P-EPS), and the Rack assist type EPS(R -EPS). System stiffness of Different types of EPS which effects on steering performance, are known by simulation result and measuring products. P types of EPS are more stiffer than C types of EPS and contribute to steering performance at on centre range of vehicles. By analyzing of performance with types of EPS, this paper proposed improving method for C-EPS stiffness.

4,000원

〈학술연구〉

16

침전지 유입부 설계를 위한 속도계측에 관한 연구

조대환, 정하균

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.415-420

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The present study has measured the velocity distribution in a three-dimensional shape model of the rectangular settling tank using PIV system. The experiment system consists of hi-speed camera, laser and host computer. Reynolds number based on the guide wall height(H=25mm) has been applied during the whole experiments. The results showed that recirculation flow in settling tank exists and a internal flow weakly influenced by Reynolds number at Re=5×103 greater.

4,000원

17

선박 거주구 주위의 풍압분포 특성에 관한 연구

최상범, 조대환

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.421-426

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Dispersion conditions of exhaust gas emitted from the ship stack are varied due to the state of sea surface, ship velocity and external environment condition etc. In the certain circumstances, the exhaust gas flowing backward phenomena is appeared due to the shape of vessel structure. The negative pressure layers can appear at the rear part of deck house and cause the exhaust gas flowing backward phenomena. In this study, 1:100 scale model ship was manufactured and tested in the large wind tunnel test center to ensure the exhaust gas flow patterns. Measurement results showed that the greatest pressure point was x/H=1.55 at zone 6 and Case 2 was a relatively high wind pressure distribution.

4,000원

18

선박건조 및 수리업의 소음 저감 대책

김병삼

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.427-432

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There is a considerable amount of research on ship worker’s hearing loss caused by vibration and noise that comes from the ship’s construction. A further investigation that characterizes the sound that comes from building or repairing a ship is nonexistent or insufficient, however. To do this, a noise management plan is needed. It should include a generated sound process from the main sources of disturbance in the ship- building areas. And a soundproof measurement will identify the amount of noise reduction needed for a hearing- safe working environment. Finally, researchers in this study measured tests on the noise and the vibration process, and the noise caused by operations allowed for an investigation on the suitability of certain environmental conditions. Noise-related programs can be used to predict the noise distribution of the noise level characteristic. This can help identify and reduce the presence of sound interference through sound proofing measures.

4,000원

19

Herschel-Bulkley 점도모델이 적용된 모세혈관망의 유동해석

모정하

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.433-439

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The present study investigated the blood flow at microvascular network. The role of the blood viscosity and the yield stress of blood on the flow at the microvascular network was examined to find the condition of hemostasis. When the yield stress was less than 0.005Pa, there was no stagnant region in the capillary network used in the study. However, when the yield stress increased to 0.05Pa, stagnant areas began to appear, which grew and expanded rapidly with further increase in the yield stress. From the blood viscosity profile of a patient, one can estimate the yield stress of blood, from which the risk of hemostasis can be determined.

4,000원

20

The Study on the Impact CFRP Composite Circular Structures of Collapse Characteristics

Yang, Hyun Soo

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.441-446

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Because of the inherent flexibility in their design for improved material properties, composites have wide applications in aerospace vehicles and automobiles. The purpose of this study is to investigate the energy absorption characteristics of CFRP(Carbon Fiber Reinforced Plastics)tubes on static and impact tests. Static compression tests have been carried out using the static testing machine(Shin-gang buckling testing machine)and impact compression tests have been carried out using the vertical crushing testing machine. When such tubes were subjected to crushing loads, the response is complex and depends on the interaction between the different mechanisms that control the crushing process. The collapse characteristics and energy absorption were examined. Trigger and interlaminar number affect the energy absorption capability of CFRP tubes.

4,000원

21

장방형 물체 후방의 공동이 하류유동장에 미치는 영향

최상범

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.447-452

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The effect of the cavity behind Rectangle Bluff Body in turbulent single-phase flow was studied using Particle Image velocimetry (PIV). The results for the time-averaged velocity showed a recirculation flow behind the bluff body. The horizontal location behind the bluff body where the time-averaged vertical and horizontal velocity components were zero was found at approximately 1.2H and the end of the re- circulation region was shifted upstream by effect of the cavity.

4,000원

22

군사 훈련소 이전을 위한 환경소음 영향 평가

김병삼

한국기계기술학회 한국기계기술학회지 제15권 제3호 2013.06 pp.453-457

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This study estimates environmental noises and noise impacts on surroundings by relocation of military training center from city central to suburb. Devising noise prevention plans are found to diminish harmful influence and to design noise reduction system. The prediction is drawn in each separation distance. The measurement is conducted during shoot exercise by a light machine gun(M60), an assault rifle(K-2), a Panzerfaust 3 and a recoilless rifle. The measured noise is 103dB(A) at shooting range in military training center, that is very high noise level. The characteristic of shooting noise is momentary and impulsive, also high leveled through all frequency band. And the forecast of noise assessment at the intended area exceeds noise criteria. Consequently, civil complaint is highly expected. Therefore, noise control system is needed for firing range. General methodology, such as soundproof box and barrier can reduce noise level at residential area near shooting range, which is anticipated by simulation.

4,000원

 
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