Earticle

Home

Issues

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
제16권 제2호 (27건)
No

<학술연구>

1

열간 금형강의 기계적 성질에 미치는 진공열처리와 염욕열처리 조건의 영향

김제돈, 박기호

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1235-1242

※ 기관로그인 시 무료 이용이 가능합니다.

Salt bath heat treatment is usually used but recently vacuum heat treatment is increased for the heattreatment of hot work die steels. The differences in two heat treatment processes were compared bytesting the mechanical properties of heat treated products. With two different features of processes,mechanical properties such as hardness, tensile strength and impact strength of products show verydifferent results. “In this study, salt bath heat treated products” showed higher tensile strength and impactstrength than vacuum heat treated products but hardness was not much different. These lower mechanicalproperties of vacuum heat treated products are due to differences in heating and quenching process.

4,000원

2

잡음 신호가 제거된 원형 봉 웨이브가이드에 관한 연구

정현조

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1243-1248

※ 기관로그인 시 무료 이용이 가능합니다.

Bar type waveguides are frequently employed as a buffer rod between ultrasonic senor and hard-to-access object in many measurement applications. Difficulty in pulse echo measurements using a buffer rod is caused by spurious echoes due to reflection, mode conversion and interference within the buffer rod of finite size. These spurious echoes degrade the signal to noise ratio (SNR) because of their possible interference with desired target signals. A tapered buffer rod or rods with non- symmetrical cross sections were used before to reduce these unwanted spurious echoes. In this paper, we propose signal processing techniques to remove the spurious echo signals. Experiments were performed in order to examine the refocusing and recovering the initial input waveform in the long range propagation of ultrasonic waves in cylindrical waveguides. Two different time reversal processes (regular TR and reciprocal TR or inverse filtering) are tested and the experimental results were compared.

4,000원

3

발전용 터빈의 형상에 대한 성능 해석

이동렬

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1249-1254

※ 기관로그인 시 무료 이용이 가능합니다.

This research is to investigate the performance analysis of turbine for power generation with three different numbers of the nozzle vane in the turbine. Velocity, pressure. and temperature distributions of fluid over the flow domain of the turbine are numerically calculated for the optimum design of nozzle with two different rotational speeds of the turbine blade (1000 and 1500 RPM). Ultimately, the energy-efficient and maximum power-generated shape of the nozzle vane are determined through three different maximum Mach number of the flow with three shapes of the nozzle vane (10, 18, and 24 EA).

4,000원

4

중형디젤기관의 운전조건에 따른 디젤매연여과 장치의 재생시점에 관한 연구

김규성, 박성천

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1255-1260

※ 기관로그인 시 무료 이용이 가능합니다.

Many countries of the world has been devoting a lot of effort to reduce carbon emission. In order to reduce carbon emission, the high efficiency engine has been studied in the automotive industry. Of these, the spread and research of the diesel engine in Europe center are active. However the combustion characteristic of diesel engines have disadvantages of much NOx and soot emissions. In this study, the optimum regeneration point of the forced regeneration type DPF(Diesel Particulate Filter) that was equipped in medium-duty diesel vehicles using a mechanical fuel injection system have studied. DPF that is applied to the medium-duty diesel vehicle has a bent inlet pipe. The flow distribution characteristics of DPF according to the influence of the bent pipe have investigated. The flow distribution characteristics of DPF according to variation of the engine operating condition is considered to be useful data In order to decide the optimum regeneration point.

4,000원

5

노후 가솔린 차량의 정비 전ㆍ후의 배기가스와 연비 비교분석을 위한 실험방법에 대한 연구

유종식, 김철수, 정우원

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1261-1266

※ 기관로그인 시 무료 이용이 가능합니다.

The two experiments were done on stationary car at 800rpm, 1500rpm and running car on oscilloscope and chassis dynamometer at the speeds of 20km/h, 60km/h. In this experiment, the relativity between waveform, exhaust emissions and fuel consumption through two experimental methods were measured in case of cars with failures in MAP sensor, O2 sensor, spark plugs. The following results are obtained by analyzing the data relativity between two experimental methods, such as stationary and running tests. A simple stationary test under the maintenance of a decrepit gasoline vehicle would be realistic possibility to predict the fuel consumption and the exhaust emission comparable to results of running test with a chassis dynamometer.

4,000원

6

알루미늄 폼의 접착부에서의 경사각도별 전단 특성에 관한 해석 연구

손홍붕, 조재웅

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1267-1272

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, tapered double cantilever beam bonded with aluminum foam composite is modelled and analyzed by finite element analysis. The bonding strength on Mode II of this structure is evaluated and investigated. In cases of inclined angles of 6°, 8° and 10°, maximum equivalent stresses occur 1.29, 1.59 and 2.6 MPa respectively at the range of forced displacement of 5 to 6 mm. And maximum reaction forces become 186, 208 and 235 N individually at this range of displacement in these cases. By the analysis result on 3 kinds of models, the maximum reaction load increases as angle of inclination of model increases. And the elapsed time to approach the maximum load and the time to disappear away become shorter. This study result can be applied into the real composite structure with aluminum foam in case that the surface bonded with adhesive is inclined. This fracture behavior can also be investigated and the impact property can be examined.

4,000원

7

CFD를 이용한 디젤 연료펌프 공급관의 형상에 따른 맥동 저감 비교 분석

김윤정, 김창민, 김철수, 정우원

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1273-1278

※ 기관로그인 시 무료 이용이 가능합니다.

Fuel pump of a vehicle is a device to supply the fuel from fuel tank to engine. This study analyzed the pulsatility on the shape of fuel supply pipe using a CFD(Computational Fluid Dynamics). Numerical analysis was performed to use 3-dimensional incompressible k-ε turbulent model with measured pressure values at an exit by an experiment. Simulation models used commercial and improved model. In this study, the characteristics of the pulsatility reduced in improved model compared to those in commercial model. The pressure loss, which occurs at the flexure, was effective to pulsatile reduction. Commercial and improved model differed by numbers of flexure. The number of flexure between inlet and outlet decreased the difference of velocity and pressure. Therefore, the design of fuel supply pipe should be considered numbers and shape of flexure.

4,000원

8

복합재 판스프링에서의 재료특성에 따른 스프링 강성의 수치해석적 연구

오성하, 최복록

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1279-1284

※ 기관로그인 시 무료 이용이 가능합니다.

This paper shows the feasibility on the application of E-glass fiber/epoxy(GFRP) composite materials to an automotive leaf spring. In order to keep much lighter weight by replacing the steel with the composite material, it is important to optimize the material parameters and design variables consisting of the structure. This paper focused on the effects of material compositions and its fiber orientations for estimating the static behaviors of leaf spring. First of all, basic material properties of GFRP composite were measured by five types of coupon specimens from ASTM standard test. The reverse implementation was also done to obtain the complete set of in-situ fiber and matrix properties from ply test results. Finally, the static spring rates was examined for the variation of thickness and material parameters such as fiber angles and resin contents of composite leaf spring.

4,000원

9

25% 오프셋 고속 정면충돌시 탑승자 보호성능에 관한 연구

조휘창, 박인송

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1285-1291

※ 기관로그인 시 무료 이용이 가능합니다.

25% offset high speed frontal impact is the vehicle will crash left 25%(Quarter of the width of the vehicle). 47.6% of drivers killed in vehicle alone and car to car frontal impact occurred in frontal impact small overlap. Study on the occupant protection performance of 25% offset(small overlap) high speed frontal impact results are as follows. In terms of vehicle occupant protection performance, body structure was excessive intrusion into the passenger room and showed such improvement is needed for the design. This is due to a collision risk with the passenger and the solid body increases the risk of injury, showed that improvement is needed. To strengthen the safety of the future, propose improvements on the evaluation results of a statistical analysis and test of the industry and the policy makers.

4,000원

10

반경변화 풀리의 회전판 슬롯 형태변화에 대한 회전력 해석

권영웅, 오선

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1293-1299

※ 기관로그인 시 무료 이용이 가능합니다.

In this study variable radius pulley is proposed, and the proposal should be applied to pulley of CVT. Variable radius pulley consists of two disks and sliding pins. Phase difference of two disks make a change pitch diameter. Therefore change speed is accomplished by changing pitch diameter of pulley. In this paper analysis of rotating force for slot variation of the rotary disk of variable radius pulley was performed. The results of analysis are appropriate to put to practical use of the variable radius pulley.

4,000원

11

풍력발전 깃의 최적 설계에 관한 연구

이동렬

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1301-1306

※ 기관로그인 시 무료 이용이 가능합니다.

This research is to study on the optimum design of the wind power generation blade with three different shapes of the wind turbine blade and three air input speeds (7, 10, 15m/s). In order to perform this numerical analysis, velocity, pressure, and temperature distributions of fluid over the flow domain of the turbine blade and also pressure coefficient and ratio of the Lift to Drag force are numerically calculated for the best design shape of blade using commercial CFD code. Finally, the energy- efficient and optimum shape of the wind turbine for power generation are determined with the sequence of case1, case2, and case3.

4,000원

12

캐스케이드 열교환기용 고온/저온 내부열교환기를 부착한 이원냉동시스템의 성능 특성

노건상

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1307-1313

※ 기관로그인 시 무료 이용이 가능합니다.

In this paper, cycle performance characteristics of a cascade refrigeration system with internal heat exchanger for cascade heat exchanger using alternative freon refrigerants is presented to offer the basic design data for the operating parameters of the system. This system considered in this study is consisted of a high temperature cycle using Freon refrigerant R23, R508B and low temperature cycle using Freon refrigerants R22, R507A. The operating parameters of this system include subcooling and superheating degree, evaporating temperature, compressor efficiency, and so on. The main results were summarized as follows : The COP of cascade refrigeration system using R23/R507A is the highest results in this study. The COP of cascade refrigeration system with internal heat exchanger only in high temperature cycle is the highest value among three cycle, such as only low temperature cycle, only high temperature cycle and all the cycle.

4,000원

13

선령 증가에 따른 주기관 성능분석에 관한 연구 - 실습선 새누리호를 중심으로 -

김홍렬, 김부기

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1315-1321

※ 기관로그인 시 무료 이용이 가능합니다.

In the world economy and the shipping industry, container, bulk carriers and oil tanker vessels are undergoing a bigger difficulty because of the imbalance on supply and demand with the view that ship's loading capacity is exceeded. For this reason, shipping companies are trying to reduce the operating cost through slow steaming. Thus, under this condition of continuous recession in shipping industry, saving on fuel consumption is the main issue. In this study, tests were conducted to find out the method of reducing fuel oil consumption by economically operating the ships, taking into account the main engine power and speed. The subject vessel's fuel consumption compared to the output is lower near the range of 138~157RPM. The engine speed showed significant increment to 144RPM and fuel consumption increased rapidly compared to the engine speed at 15knots and above. During sea trial test, the subject vessel's specific fuel rate(SFR) was 134.25[g/BHPh] while the calculated value after 10 years of operation is 137.1[g/BHPh] at speed range of 148~150RPM which is 70% of the load and this indicates an increase of approximately 2.1%.

4,000원

14

경사진 원형관에서 표면장력과 중력에 의한 비뉴턴 유체(Casson 모델)의 유동

모정하

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1323-1329

※ 기관로그인 시 무료 이용이 가능합니다.

This paper presents the theoretical analysis for the flow driven by surface tension and gravity force in an inclined circular tube. The present study introduces detailed mathematical procedures for Casson viscosity model. The equations of velocity distribution and flow rate are developed to describe the displacement of a non-Newtonian fluid that continuously flew into a circular tube by surface tension. The equation of modified volumetric flow shows the complicated form of (10) due to yield stress term, and the equation of velocity distribution which includes the yield stress and inclination angle of circular tube is composed of terms of r and rc as form of (14).

4,000원

15

차량용 우퍼스피커의 라우드니스에 관한 연구

이태근, 김병삼

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1331-1337

※ 기관로그인 시 무료 이용이 가능합니다.

The characteristic test define the thiele-small parameters and the speaker is modeled to linear or non-linear model by thiele-small parameters. The performance test is carried out the sound quality by feeling test(subjective test) and objective test. The feeling test has many problems in a viewpoint of reliability, repeatability and preference that are related to judge. The study on the correlation between feeling test and objective test are carried out in some researches and introduce the loudness, sharpness, roughness and fluctuation strength. In this study, the loudness characteristics, which is related to sound quality, of the woofer speaker that are fitted to the domestic vehicle is investigated by measurement

4,000원

16

탄소 섬유 강화 플라스틱 샌드위치 복합재료의 충격특성에 관한 연구

고등, 조재웅

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1339-1344

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, carbon fiber reinforced plastic and aluminum foam used in impact absorber are assembled and modelled. These models are investigated by impact simulation and verified by experimental data. Impact energies of 30 J, 60 J and 100 J are applied on these specimens by striker. For example the experiment for impact energy of 30 J is done and verified by referring to analysis result. As the structural safeties of these assembled composite materials can be anticipated through this study result, these simulation analysis results can be applied into real field.

4,000원

17

크롬주강용 콘크리트 펌트 트럭 파이프의 건식 내마모 거동

김은성

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1345-1350

※ 기관로그인 시 무료 이용이 가능합니다.

The Aim of this study is to determine the effectiveness of wear resistance and friction characteristics in Cr-C steel. To find wear resistant and friction with inner elbow pipe, it is needed hardness and frictional condition test to be capable of supplying with high Cr-C steel. The result of HTV(heat treatment in vacuum) shows that hardness increased with increasing Cr content in % carbide phase. After the HTV, hardness could improve by 7∼10% in Vickers hardness test and by 8∼20% in Rockwell hardness test, respectively. This behaviour of the hardness of Cr casting steel was explained by the types of chemical bonds that hold atoms together in Cr carbide phase. Through the friction coefficient and wear loss test, the increase of Cr wt% could reduce in the coefficient of friction and wear loss. The results obtained with Archard’s formula are not only dynamic calibration curve of friction coefficient and specific wear coefficient Kad but also the relation of hardness, friction coefficient and specific wear coefficient Kad.

4,000원

18

댐퍼를 고려한 라우드스피커의 진동모드 분석

이태근, 김병삼, 김경환

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1351-1356

※ 기관로그인 시 무료 이용이 가능합니다.

The loudspeaker is the directly radiated speaker which generates the sound by the vibration of cone paper. Therefore the shape and the vibration characteristics of th cone paper is important factors affecting the performance of speaker. The vibration mode of cone paper is piston mode that vibrates to the up-down direction, and we can see the divided vibration in the higher mode. Because the loudspeaker has a damper, the vibration mode is different to the mode of the only cone paper. In this study, the vibration mode of cone paper which considering the damper and the effects of the damper diameter were investigated by finite element method.

4,000원

19

음향방출 원신호를 이용한 저항점용접의 품질평가에 관한 연구

우창기, 이장규

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1357-1363

※ 기관로그인 시 무료 이용이 가능합니다.

To estimate weld quality of the resistance spot-welding, the acoustic emission features are investigated from the total acoustic emission signal at the single-spot weld. Typically, the resistance spot welding process consists of several stages: set-down of the electrodes, squeeze, current flow, forging, hold time, and lift-off. Various types of acoustic emission response corresponding to each stage can be separately analyzed by using back-propagation neural network classifier and wavelet transform technique. The presented machine learning results provide a validation for using back-propagation neural network and wavelet transform technique as a valuable insights into the resistance spot-welding process. Especially, a wavelet transform technique is demonstrated and the plots are very powerful in the recognition of the acoustic emission features.

4,000원

<생산기술>

20

자동차 조향장치 비대칭 핀치요크의 원가절감을 위한 냉간단조 공정단축 설계

이현구, 박용복

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1365-1370

※ 기관로그인 시 무료 이용이 가능합니다.

This paper carried out design in order to reduce the process of asymmetric pinch yoke, one of the important parts which transfer power to wheels through gearing box in automobile steering system. The purpose of the study is to reduce prime costs and strengthen competitiveness by designing the total 8 processes including the up-setting and forging process of the No. 1 as the forging process the current method of production. The process with die stress analysis by using the finite element method have been carried out through new optimal die design. As this study result, it is expected that die life can be secured as excellent material flow and caused by forming load. A prototype has been produced by basis of the analysis result and the reduction of the process was successful. As the unit price is lower than that of the current process, the competitiveness can be expected.

4,000원

21

EPS(Electronic Power Steering)에서 Worm Wheel의 CAE 해석에 관한 연구

이정익

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1371-1378

※ 기관로그인 시 무료 이용이 가능합니다.

This study is making a product for the development of a process worm wheel of making a shape for gear for worm wheel without hobbing manufacturing process. Because of removing a hobbing process, plastic worm wheel for increased productivity and equivalent quality is produced in this molding. As the result, CAE manufacturing process for a EPS worm wheel of small and middle stage cars and hybrid vehicle is developed. Especially, the considerations for analysis results of worm wheel are as follows. the first, CAE analysis for worm wheel of first stage is considered. the second, CAE analysis for boss is considered. the third, CAE analysis for gear module strength of first stage is considered. Finally, the redesign of product drawings for troubled-considered in first stage try-out is considered in EPS worm wheel.

4,000원

22

원심형 연속 탈수구조의 폐플라스틱 분쇄물 탈수기 개발에 관한 연구

최덕기

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1379-1385

※ 기관로그인 시 무료 이용이 가능합니다.

Dehydration is a crucial part in the plastic recycling process. Without proper dehydration, a high quality recycled product cannot be produced. This study developed a continuous-type dehydrator using centrifugal force to improve the dehydrating performance and recycling throughput. The designed structure makes it capable to perform a continuous feeding and dehydrating of crushed plastic waste simultaneously. It consists of revolving drum, feed screw, insert screw, differential speed regulator and other components. Several tests were conducted to determine optimal process parameters to achieve results. Field tests using prototypes verified that the dehydrator with the proposed structure has an efficient and excellent performance.

4,000원

23

온실에 적합한 지역자원의 가용 에너지량 모델 개발

백이, 전종길, 김형권, 윤남규

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1387-1393

※ 기관로그인 시 무료 이용이 가능합니다.

Importance of alternative energy has been increasing due to environmental issues and lack of fossil fuels. In addition, heating cost that occupies from 30 to 40 % of the total production cost in Korean protected cultivation needs to be reduced for profitability and global competition. Therefore, this study was conducted to develop energy model and regional resource for recycling of resource in greenhouse. Based on the results of the theoretical and statistical investigations, energy model of regional resource was developed. This results was shown with a new standard 2,000 heads of pigs. Livestock manure was originated 8.6 kg/day/one head, and the average biogas yield was 1.23 Nm3/day occurred. The biogas reactor and engine showed that scale of 300 m3 was 25kW respectively. Agricultural and Forest Residual-products Biomass quantity in heating road of 200,000kcal/h were 1,224 kg, 912 kg respectively.

4,000원

24

EPS(Electronic Power Steering)에서 Worm Wheel 설계에 관한 연구

이정익

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1395-1399

※ 기관로그인 시 무료 이용이 가능합니다.

This study is making a product for the development of a process worm wheel of making a shape for gear for worm wheel without hobbing manufacturing process. Because of removing a hobbing process, plastic worm wheel for increased productivity and equivalent quality is produced in this molding, As the result, this important process is to manufacture a EPS worm wheel of small and middle stage cars and hybrid vehicle. Especially, the main goal of this study is as follows. The worm wheel design software of electronic power steeringis developed through this study. CAD file of this software is expressed as design notes and design shape of worm gear for manufacturing of worm wheel.

4,000원

25

리클라이너 의자용 프레임의 최적설계

조장현, 함재홍, 배기성, 서욱환, 유성출

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1401-1406

※ 기관로그인 시 무료 이용이 가능합니다.

This paper is concerned with the optimal design of recliner chair frame. It is necessary for recliner chair frame that is endurable for the repeated load of human sitting. And this paper studies the selected recliner chair frame that is produced in the regional company. The company has not designed and made this chair by the mechanical engineering review. So the current frame structure and parts in this chair frame are studied and researched to develop the new frame structure with mechanical engineering design concepts. This research reported the investigation of new design of recliner chair frame by stress analysis and the verification of mechanical safety. This result will be adopted to design specification of new recliner chair frame.

4,000원

26

냉중성자 수조내기기 설치 및 유지관리

박국남, 이용섭, 이번헌, 김민수, 권용세

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1407-1413

※ 기관로그인 시 무료 이용이 가능합니다.

The HANARO reactor constructed from Jan. 1985 to April 1995, and a major utilization system, the Cold Neutron Research Facility was completed Nov. 2010. The cold neutron research facility consists of a Cold Neutron Source, a process system, a neutron guide and a Spectrometer. A moderator is utilized to transform thermal neutrons into cold neutrons. A moderator cell accommodates the moderator. The inner assembly contains an aluminum moderator cell connected to a stainless steel heat exchanger by a bi-metallic transition joint. An In-Pool Assembly is welded to this inner assembly and a double flexible pipe, and a vacuum chamber is inserted. After HANARO reactor shutdown, the in-pool assembly was installed at a cold neutron hole in the reactor pool. We confirmed a precise installation by using an underwater TV camera for a nuclear reactor inspection. In-pool assembly connected to double flexible pipe each system in the Cold Neutron Research Facility. After cold neutron research facility operated, the reliability of vacuum system, helium refrigerator system, gas blanket system and hydrogen system for maintenance was confirmed.

4,000원

27

논문게재 안내 외

한국기계기술학회

한국기계기술학회 한국기계기술학회지 제16권 제2호 2014.04 pp.1415-1423

※ 기관로그인 시 무료 이용이 가능합니다.

4,000원

 
페이지 저장