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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
제16권 제1호 (25건)
No

〈학술연구〉

1

Mode Ⅱ 하중에서의 에폭시계 접착제의 피로균열 진전특성

박성완

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1055-1062

※ 기관로그인 시 무료 이용이 가능합니다.

The natures of fatigue crack growth under Mode Ⅱ loading are studied. End notched flexure beamspecimens were used. The effects of adherend thickness, rubber modification and adhesive thickness on fatiguecrack growth were examined. The experimental results show that some of these parameters apparently do affectfatigue crack growth. Resistance to ModeⅡ fatigue crack growth are increased by rubber modification. Theeffects of adhesive thickness and rubber content on fatigue crack growth were explained by von Mises'sequivalent stress using BEM analysis. For unmodified epoxy adhesives, the fatigue crack growth propertiesunder Mode Ⅱ loadings were significantly different in all regions. For rubber-modified epoxy adhesives, theywere also different in the first and second regions, but in the third region, they were similar.

4,000원

2

승용차 파워시트용 하이트 모터에 대한 진동 해석

김기선, 조재웅

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1063-1067

※ 기관로그인 시 무료 이용이 가능합니다.

Various motors have been used in many cars to control the height of automotive seats. As the motor isconnected with seat, it can be moved as the convenience of passenger and vibration affects passenger whenmotor is being driven. In this study, three models are designed. The lengths of link parts and screw axes areincreased or decreased respectively in the order of models 1, 2 and 3. The case of motor is made ofaluminum alloy and the rest is made of structural steel. As model 1 has the maximum amplitude displacementat 1360Hz by the basis of vibration analysis, model 1 has the most durability among three models. This studyresult can be effectively utilized with the design on height motor by investigating prevention and durabilityagainst its damage.

4,000원

3

데이터 흐름 분할을 이용한 정보 최대화

김형일

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1069-1074

※ 기관로그인 시 무료 이용이 가능합니다.

This paper proposes an information maximization method to extract useful informations for streaming signals. The information maximization method is to extract signals using stream partitioning function and standard normalization function. The stream partitioning function divides streaming signals into intervals. Signal coefficient and interval coefficient are used at generating a interval by using stream partitioning function. Signal coefficient determines the quantity of data included in a signal interval. Interval coefficient determines the starting point of a signal interval. The standard normalization function determines a signal range by using the probability density function for streaming signals. The information maximization method becomes resistant to outliers and missing values. A normal signal can be extracted effectively for streaming signals by the Information maximization method. The effectiveness of proposed method are also presented by several experimental results.

4,000원

4

폭발용접을 이용한 클래드 타이타늄합금 인공고관절 제조

김정재, 원대희, 국진선

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1075-1082

※ 기관로그인 시 무료 이용이 가능합니다.

The purpose of this study is to decrease a stress shielding effect shown in the hip joint. To conduct this study, the clad materials were produced by using an explosion welding method with two materials that were different in the elastic modulus like Ti-6Al-4V alloy and pure Ti. As for the clad materials, the Ti-6Al-4V alloy with large elastic modulus was designed as the neck of femur, and the pure Ti with small elastic modulus as the body of femur. The joints of clad materials formed by the explosion welding showed the typical wave shape, and its thickness was about 0.2㎛. New crystal or grain structure was not formed in the joints. In addition, the Vickers hardness in the joints formed the middle value between the base metal and clad metal. As a result of manufacturing prototype by processing the clad materials in three dimensions, this study gained good shape, and if it is to be applied to clinical in the future, this researcher can expect good results. From the result of this research above, it may be summed up as follows. It is considered as the stress shielding phenomenon showed on the hip joint can be decreased to a certain degree if this researcher is to utilize two clad materials with different elastic modulus like Ti-6Al-4V alloy and pure Ti.

4,000원

5

태양열 에너지 저장탱크에서의 충진제 특성 및 HTF 유입속도에 따른 열유동 해석

조재혁, 김우태

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1083-1088

※ 기관로그인 시 무료 이용이 가능합니다.

A 2D axisymmetric numerical analysis was performed to study the characteristics of charge process inside solar thermal storage tank. The porosity and heat transfer coefficient of filler material as well as inlet velocity of heat transfer fluid are selected as simulation parameters. The porosity is varied as 0.2, 0.5, and 0.8 to account for the effect of filler granule geometry. Two levels of the heat transfer coefficient is adopted to assess the heat transfer between heat transfer fluid and filler material. The inlet velocity is varied as 0.00278, 0.0278, and 0.278m/s. As both of the porosity and the heat transfer coefficient increase, the discrepancy of the temperature distributions between the filler and heat transfer fluid decreases. As the inlet velocity increases, the penetration depth of the heat transfer fluid increases proportionally.

4,000원

6

다양한 흡착 특성을 갖는 초박 액막의 응결 특성에 대한 연구

한민섭

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1089-1095

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Ultra-thin liquid films on solid substrates in contact with the saturated vapor are studied by using molecular dynamics simulation. The properties of evaporation and condensation of the films of various adsorptive strengths and thicknesses are obtained during the quasi-steady film evolution. Net condensations occur when the ultra-thin films on the high energy surface come into contact with the saturated vapor phase because the normal film pressure stays lower than the saturated vapor pressure. The net condensation rate is higher for the material combination of higher adsorptive strength. It becomes more so when the film thickness is of a lesser size. On the other hand, that of lower adsorptive strength has lower net condensation rate and depends less on the film thickness. Therefore, the size effect of the condensation phenomenon is more significant for the system of a higher adsorptive strength. This properties come from the state of ultra- thin film, which can be quantified by using disjoining pressure in the quasi-steady processes. These results have implications in practical problems concerning the moving contact line when the precursor film formation is critical.

4,000원

7

CBN 공구를 이용한 SKD 11의 가공성 평가에 관한 연구

이기주, 신형곤

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1097-1104

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The development of machining technology has coincided with the recent development of a diverse amount of materials and tools. The developed materials largely consist of hardened steel for vehicle and the mechanical industry. The machining of the hardened steel is performed in a lathe and many kind of machining centers, but it is difficult to machine because its hardness is the most difficult-to-cut materials. Hard-turning is a kind of machining process which omits the final grinding process and replaces it with a single accurate cutting process. In this paper, the turning of SKD 11(HRC 58) was performed using the CBN tool in order to recognize the optimum process conditions. The cutting force, tool life and wear, surface roughness were measured. Examining the machining characteristics when cutting of high hardened steel, low cutting speed and high conveying speed were identified to be effective in cutting conditions of SKD 11. Tool life was most effective in the conditions with 65m/min of cutting speed and 0.193mm/rev of feedrate and approximately 0.5um of very good surface profile was acquired at 0.079mm/rev of feedrate. Therefore, when cutting with Low CBN tool, it could be considered to be sufficient in reducing the steps of precision machining or replacing the polishing

4,000원

8

산소극 반응가스 흐름방향, 상대습도, 기공률 변화에 따른 고분자전해질연료전지 성능분석

류의환, 김우태

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1105-1110

※ 기관로그인 시 무료 이용이 가능합니다.

A numerical analysis was performed to study PEMFC performance characteristics depending on the flow direction of cathode reactant gas, cathode relative humidity, and porosity of gas diffusion layer. As cathode relative humidity decreases and porosity increases, current density increases due to better diffusion of reactant gas to cathode surface. As current density increases, power density increases initially and then decreases with its maximum located around current density value of 2.2 Amperes per square centimeter. From the analysis of current density distribution inside membrane, the counter-flow cases show more uniform profile across the membrane than the co-flow cases due to more uniform reactant gas supply.

4,000원

9

노이즈가 포함된 과열증기표의 모델링에 신경회로망 적용 타당성에 대한 연구

이태환, 박진현

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1111-1116

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The thermodynamic state variables in superheated region of steam table are not wholy obtained by measurements. This means that steam table contains a little error. In this study small error was artificially added to superheated variables and modeled using neural networks. The results were compared with the analysis using quadratic spline interpolation method. By and large the relative errors of variables by neural networks were sufficiently small and similar to or less than those by quadratic spline interpolation method. It was concluded that neural networks could be one good way of modeling for superheated steam table.

4,000원

10

300K VLCC선박의 저항성능 예측 기법에 대한 연구

최희종

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1117-1123

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In the present study, numerical algorithms for a very large crude oil carrier(300K VLCC) were taken into account. The potential flow analysis method was adopted to predict the flow pattern and the fluid force around a ship. The exact nonlinear free surface boundary condition were compared to predict the wave system generated by the ship and the trim and sinkage state of the ship also were considered. In order to deal with complex geometries of the 300K VLCC the panel cutting method was adopted to generate the ship surface panel and the variable free surface panel method was taken applied to generate the free surface panel. The developed numerical analysis algorithm were applied to the 300K VLCC and the results predicted by the numerical analysis were compared with the experimental data.

4,000원

11

파괴방수차 노즐 형상에 따른 다관절 붐의 충돌에 관한 연구

김진수, 소수현, 임수홍, 옥소쿤티아릇

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1125-1131

※ 기관로그인 시 무료 이용이 가능합니다.

In this paper, a commercial multibody dynamics program ADAMS was utilized to investigate the model for the multi-joint boom conflicts. In this process, CATIA, ANSYS and ADAMS were used to develop the simulation. The addition of ADAMS made the system more accurate and improved precision of the system. In brief, the 3D CAD model of the structure was initially developed via CATIA. After this, the CATIA models were exported to ANSYS for creating flexible-body modeling by using formatted file. Subsequently, with ADAMS, the flexible body model was directly imported from ANSYS which performed the analyses of the dynamic collision of the nozzle boom conflicts. This contained the information regarding geometry and model shapes of the flexible body. Using ADAMS/Durability, it was possible to determine the strain energy for the nozzle configuration by crashing the contact structure that was created. Via this procedure, the acquired simulation analysis of nozzle showed interestingly good results with respect to the objectives of the study.

4,000원

12

정보망에서 대표정보 생성 기법

김형일

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1133-1139

※ 기관로그인 시 무료 이용이 가능합니다.

If information representativeness is given to an information network, users can easily see what representative information the site has, and it helps in reducing unnecessary time during information search. This paper proposes the generating representative information method which utilizes the degree of coupling of information and the weighted information value in order to solve various problems which occur in the information network. The generating representative information method measures the degree of coupling of the information by utilizing the attribute information and page information expressed on the information network and generates the representative information by calculating the weighted information value of the information network. are also presented.

4,000원

13

Determination of Microwave Waveguide Position for Potato Chip Drying System with Multiple Waveguides

Che Woo Seong

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1141-1147

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In this paper, numerical simulations are performed for the drying process of potato chip in a microwave oven with multiple waveguides, with the purpose of enhancing the uniformity in temperature distribution. A simulation model is built and simulated using COMSOL Multiphysics software. The simulation model uses 5 different positions of waveguides to see whether it affects the heat distribution in the material. In order to know the final temperature result of the material after it comes out of the cavity on a moving conveyor belt, the average temperature values along the direction of the conveyor belt motion are calculated and plotted. From the results, the best waveguide position is determined to get the best temperature distribution in the potato chips.

4,000원

14

물분사 추진 시스템용 입구 덕트 주위의 포텐셜 유동해석

최희종

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1149-1154

※ 기관로그인 시 무료 이용이 가능합니다.

In the paper an efficient numerical algorithm to predict the flow phenomena around the water-jet propulsion system was described. The potential-based flow analysis method was adopted to predict the velocity and the pressure on the inlet duct of the water-jet propulsion system. The method employed normal dipoles and source distributed on the solid surface such as the inlet duct and the tracked vehicle. The inlet duct and outlet open boundary surfaces were introduced where the sources and dipoles were distributed to define a closed boundary surface. The developed numerical algorithm was applied to a tracked vehicle propelled by the water-jet propulsion system with the different IVR(inlet velocity ratio). The results by the numerical analysis were compared with the experimental data in order to verify the feasibility of the proposed numerical algorithm.

4,000원

15

CFD 해석에 의한 대형선박 공기유입실의 급기팬 위치선정에 관한 연구

조대환, 서광옥

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1155-1160

※ 기관로그인 시 무료 이용이 가능합니다.

For more efficient air-conditioning in large scaled vessels, structure of air inlet room and location of supply fan are very important. In this study, we have modeled an air intake room of large scaled vessels and tried to examine surrounding flow characteristics around supply fan by a numerical simulation using computational fluid dynamics based on three dimensional steady-state Navier-Stokes equation and standard k-ε model. A commercial CFD program, FLUENT, is used on the analysis. Finally, the analysis showed that the supply fan should be located at the inner side rather than outer side of air intake room, which was original design.

4,000원

16

유동해석을 통한 내부 ECV의 비교 분석

김한국, 조행묵

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1161-1166

※ 기관로그인 시 무료 이용이 가능합니다.

This paper carried out a comparative analysis with papers on the analysis and analytic research of conventional solenoid. In case the current of solenoid valve is cut off, a flow path is formed from pressure port (Pc) connected with the crankcase of compressor to Ps port. At this time, the size of Pc port hole was so adjusted (Type-2) that it was smaller than 4.0mm(Type-1) of original hole by 0.2mm. After that, it was thought that an effect would be produced on the flow change of refrigerant which came into the solenoid vale, therefore the flow characteristics in moving from Pc port to Ps port was predicted and comparatively analyzed. According to the results of flow analysis, a velocity of approximately 46m/s and 129m/s was shown at the maximum in case of 0.2 and 1.5 MPa in Type-1, and the maximum velocity of approximately 500m/s and 1400m/s was shown in case of Type-2.

4,000원

17

금속재료품 제조공정에서의 작업환경소음

김병삼, 박진영, 이영욱

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1167-1171

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The object of this paper is to evaluate a working environment noise at manufacturing process of metal material products. To accomplish the object; An employee noise exposure criteria, which is mounted in big size enterprise, was investigated. The noise at the 460 points of the manufacturing process machine in the 38 processes of the 1 factories were measured. The database of the noise was built from the measurement data. The major sound sources and frequency range for the manufacturing process of metal material product machine was investigated. In this study, we compare working environment noise criteria of korean with employee noise exposure criteria.

4,000원

18

전자제어 밸브(ECV) 내부로 유입되는 냉매의 유동 특성에 관한 연구

김대영, 조행묵

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1173-1178

※ 기관로그인 시 무료 이용이 가능합니다.

In this paper, we analyzed the characteristics of the mass flow rate and velocity of the refrigerant in response to a change in the number of holes and the diameter size(Type-1~4) of the valve guide refrigerant to flow from Pc to Ps when the pressure is constant. Type-1 is 40% higher mass flow flowing in the direction of Ps as compared with the Pc mass flow rate. Type-2 is 64% higher mass flow flowing in the direction of Ps as compared with the Pc mass flow rate. Type-3 is 50% higher mass flow flowing in the direction of Ps as compared with the Pc mass flow rate. Type-4 is 47% higher mass flow flowing in the direction of Ps as compared with the Pc mass flow rate.

4,000원

19

Simulation of Two-Dimensional Taylor-Couette Flow using the Lattice Boltzmann Method Combined with Smoothed Profile Method

Suresh Alapati

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1179-1185

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The flow between two rotating concentric cylinders, also known as Taylor-Couette flow system, is one of the most widely studied systems in the classical fluid dynamics. In this work, a two-dimensional Taylor-Couette flow system is simulated using the lattice Boltzmann method combined with the smoothed profile method. The fluid flow between the rotating cylinders is solved by lattice Boltzmann equation while the curved boundaries of the cylinders are treated with a smoothed profile function. To assess the validity of the present simulation technique, three different cases of rotation of the cylinders were considered: ⅰ) inner cylinder is only rotating, ⅱ) outer cylinder is only rotating, and ⅲ) both inner and outer cylinders are rotating. For all the three cases, the numerical results of the flow velocity in azimuthal direction and the hydrodynamic torque acting on the cylinders are in good agreement with the corresponding analytical solution results.

4,000원

20

마이크로 기둥 구조가 있는 표면에서의 물 액적의 겉보기 접촉각 및 젖음성 특성에 대한 연구

유동인, 박현선, 김무환, 안호선

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1187-1194

※ 기관로그인 시 무료 이용이 가능합니다.

Generally, in the previous researches, it is found that a water droplet is respectively in Wenzel and Cassie-Baxter states on hydrophilic/hydrophobic rough surfaces. And Wenzel and Cassie-Baxter equations are used to estimate the apparent contact angle on the surfaces. However, difference between measured apparent contact angle and estimated apparent contact angle with the equations is recently reported and new model to estimate apparent contact angle on rough surfaces is proposed. In this study, wetting state and apparent contact angle on the surfaces with micro-pillars should be investigated to find solution of this argument. Using the high resolution microscope, the wetting state of the D.I.water droplet on the surface with micro-pillars was visualized and apparent contact angle of the D.I.water droplet was measured. On the basis of experimental data, the equations to estimate apparent contact angle were verificated and the general wetting characteristics on the surfaces with micro-pillars are finally classified.

4,000원

21

엘리베이터 카 도어의 강도 해석에 관한 연구

조인성, 정재연

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1195-1200

※ 기관로그인 시 무료 이용이 가능합니다.

The panels of the elevator are made of stainless steel and steel-based materials that are often used. When the elevator moves in an up and down motion, or when the door is opened or closed noise and vibration of the panel occurs. Therefore, in this study, we have studied the optimal design of the elevator car door to make the best design criteria to ensure the price competitiveness in accordance with new technical standards, by using the Catia stress analysis software, we have performed theoretical strength analysis and by carrying out test according to technical standards, we have acquired the experimental data and it has been analyzed. The results of this study are shown that the permanent deformation, the elastic deformation, and the safety performance of the car door are appropriate through the analysis of test results, and design factors meeting appraisal standards of the national technical standard have been obtained.

4,000원

〈생산기술〉

22

반경변화 풀리를 이용한 무단변속장치에 대한 실험적 연구

권영웅, 최상수

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1201-1207

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, new CVT system adapted for variable radius pulley is proposed to be available for pulley of CVT. Variable radius pulley consists of two disk and sliding pins joined by these disks. On account of phase difference of two disks, sliding pins move to radial direction and pitch diameter is varied. Therefore, change speed is accomplished by varying pitch diameter of pulley. CVT adapted for variable radius pulley is also performed with dynamometer test and axial distance variation. As a experimental result variable radius pulley can be alternative such as bicycle.

4,000원

23

자동차 파워시트용 Height 구동 모듈의 스크루에 대한 강도 특성에 관한 연구

김기선, 조재웅

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1209-1213

※ 기관로그인 시 무료 이용이 가능합니다.

In this study, the strength property is investigated through structural and vibration analysis on the lead screw of height drive module for automotive power seat. The positions of applied loads are lowest, middle and highest on the model of lead screw in cases of 1, 2 and 3. Natural frequencies are examined about three kinds of models and critical frequencies are also checked by harmonic responses. Maximum deformations are shown as 0.033mm, 0.026mm and 0.551mm respectively in models of 1, 2 and 3. In case 3 at highest position, this strength becomes weakest by comparing with cases 2 and 3. By use of this analysis result, it is possible to design the model effectively applied at automotive safe driving.

4,000원

24

저가의 보급형 양축 추적식 태양광 추적기의 메커니즘 개발

이종신

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1215-1220

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A solar tracker is a device that orients a payloads can be toward the sun. Trackers are used to minimize the angle of incidence between the incoming sunlight and photovoltaic panel. This increases the amount of energy produced from a fixed amount of installed power generating capacity. In standard photovoltaic applications, it is estimated that trackers are used in at least 85% of commercial installations greater than 1MW from 2009 to 2012. This study is concerned about the structure design of a low coast and entry level dual axis solar tracker. This research purpose is to propose and verify a method to achieve higher product quality, lower costs, and far less physical testing. As a result of the new mechanism development, the volume of moving parts and the weight of main parts decreased by 46.8% and 20% respectively.

4,000원

25

PLC를 이용한 배종 감지 시스템 제어 및 직파기 용량 산출에 관한 연구

이학성

한국기계기술학회 한국기계기술학회지 제16권 제1호 2014.02 pp.1221-1225

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The latest cultivation research and development of seeding technology was improved because the demand for direct planting increased. The Programmable Logic Controller (PLC) and position sensor are utilized to control the seed detection system. In this paper, of seed types, RPM (Revolution per minute) variations and hole size are considered to determine the capacity of seeder hopper to meet the needs of customer demand. These algorithms were composed of the process of seed monitoring and the compulsion opening system. The capacity of seeding is assumed to be 1.53kg(11.6 liters) of rice seed per 1.8km. Therefore, this detection system can be used to determine the capacity according to seed types, RPM and hole size.

4,000원

 
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