한국기계기술학회지 [Journal of the Korean Society of Mechanical Technology]

간행물 정보
  • 자료유형
  • 발행기관
    한국기계기술학회 [Korean Society of Mechanical Technology]
  • ISSN
  • 간기
  • 수록기간
  • 등재여부
    KCI 등재
  • 주제분류
    공학 > 기계공학
  • 십진분류
    KDC 550 DDC 621
제20권 제1호 (22건)



자동차용 서브-프레임 사이드 멤버의 하이드로포밍 가공 시뮬레이션


한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.1-5

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Hydroforming is a forming technology in which a steel tube is fixed in a die and formed to fit a specified design shape by applying hydraulic pressure from inside the tube. In present study, the whole process ofsub-frame side member development is presented by tube hydro-forming using steel material. At the part design stage, it requires feasibility study and process design aided by CAE (computer aided design) to confirm hydro-formability in details. Overall possibility of hydro-formable side member parts could be examined by cross sectional analyses. All the components is designed and formability is examined from the point of geometry and thinning. From the simulation results, the maximum thickness reduction rate is 55% after hydroforming. In order to improve this result, the feeding by 30 mm is applied to the both sides of the tube and the thickness reduction can be reduced from this management.



A Study on the Cutting Characteristics of FCD500 for the Automobile Brake Components

Jeong-hwan Lee, Seung-hyeon Yoo, Sung-hoon Oh

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.6-11

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Among various materials, FCD500 is widely used in various fields of automobile components as it allows mass production through casting and its mechanical property is excellent. However, there are many problems in industry due to the fact that despite the wide use of FCD500, the researches about manufacture property of FCD500 are insufficient. Thus, this study conducted research on cutting manufacture property of FCD500, which is the most common manufacture method of FCD500 to suggest optimized tool and cutting condition. To achieve this, the study examined the change in cutting property based on tool material based on the most commonly used CVD(Chemical Vapor Deposition) coating tool and CBN tool, and examined the changes in cutting property by the form of CVD coating tool. The study measured cutting force, surface roughness of material after cutting, and amount of tool wear to examine the cutting property. The study gave variation in cutting speed of 280m/min and 500m/min, and fixed the feed rate and cutting depth for cutting condition to evaluate the changes by cutting speed.



고속전철 내ㆍ외장재용 경량 알루미늄 합금 주조 및 특성 평가

김기주, 원시태

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.12-17

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In this study, the whole process of 6xxx series aluminum cast alloy for high speed train interior or exterior parts are characterized. For casting, selection of optimum alloying elements, dissolution technology, de-gassing process, production of molds conforming to the conditions of use, development of casting process control technology for various shapes and materials are performed for the development of high-quality, high strength aluminum alloys. The development of more reliable lightweight aluminum and aluminum alloy for interior or exterior materials has been the scope of this study. The mechanical properties, and chemical composition of the case materials were evaluated for the 6063, 6061 and 6N01 alloy profiles and compared to the commercial materials and the evaluation results satisfied the standard.



3차원 점군 데이터를 이용한 수정 구형 특징 표현기 개발 및 도시 구조물 분류를 위한 컨볼루션 신경망의 응용

이언호, 이세진

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.18-25

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This paper presents the novel observation model, called Modified Spherical Signature Descriptor(MSSD), capable of representing 2D image generated from 3D point cloud data. The Modified Spherical Signature Descriptor has a uniform mesh grid to accumulate the occupancy evidence caused by neighbor point cloud data. According to a kind of area such as wall, road, tree, car, and so on, the evidence pattern of 2D image looks so different each other. For the parameter learning of Convolutional Neural Network(CNN) layers, these 2D images were applied as the input layer. The Convolutional Neural Network, one of the deep learning methods and familiar with the image analysis, was utilized for the urban structure classification. The case study on CNN practice was introduced in detail in this paper. The simulation results shows that the classification accuracy of CNN with 2D images of the proposed MSSD was improved more than the traditional methods' one.



보정 공정을 포함한 U-채널 성형 공정에서 스프링백의 강건 설계

김경모, 인정제

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.26-32

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The most time consuming job in the sheet metal forming process is compensating for springback. Factors such as uneven material properties and process conditions generate noise, which in turn create springback. The springback is very sensitive to the process and noise conditions, and the main effects of the design variables cannot be obtained from mean analysis. Therefore, to achieve minimal springback, an effective design countermeasure must be put in place to reduce noise effects. In this study, two robust design methods to achieve minimal springback in U-channel forming, including compensation process, are proposed. The effectiveness of the proposed methods is shown with an example of the sidewall curl springback. The proposed methods consistently outperform our previous work, indicating that the complex method is more preferable to the mean analysis, if there is no evidence of additivity of effects.



타공 통풍형 디스크 브레이크의 열전달 특성에 관한 수치해석

오지원, 선근영, 남한솔, 이수룡

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.33-39

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A numerical approach for ventilated disc brake with holes is carried out to investigate the effect of holes on the heat transfer characteristics. The numerical simulation code STAR-CCM+ is utilized to calculate flow and temperature fields with polyhedral meshes. The steady state results show that the holes make the flow velocity on the outer surface increasing, which induce the improvement of convective heat transfer on the outer surface. In the ventilated channel with holes, the convective heat transfer can be reduced due to the inflow of hot air through holes. In unsteady state, the disc has reached the highest temperature in 1,8s since the brake was engaged. The surface of disc without holes has maximum temperatures along the ventilated channels, while the surface temperatures of dis with holes are uniform.



지하철 환기구 재설계를 통한 보행자 편의성향상 연구

김시준, 김정수, 김정태

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.40-47

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The subway is a common transportation system accessed by over 8 million people on a daily basis in Metropolitan Seoul area. The subway ventilation system located on a street occupies a large area of walkways which cause inconvenience to the public. In this paper, approaches to reduce the ventilation sitting area on the pathway are examined. 5 different preliminary models of ventilation systems are analyzed to minimize the pathway obstacle area such that the public may have an easy access to pass by on the street. The amount of the air ventilation is predicted using the CFD software to ensure an efficient ventilation. The ventilation performance is verified by theory and numerical analysis. The result shows that one of the proposed model combined with the hybrid ventilation satisfies the regulation requirement of the air quantities. We may conclude that the proposed ventilation design provides a smooth walking environment to the public while the ventilation volume is maintained to the existing ventilation system with no modification of the current ventilation holes and structures.



냉장고 기계실 냉각팬이 압축기 성능에 미치는 영향

장영남, 이영림

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.48-54

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Energy saving in household refrigerators becomes more important as the usage of household refrigerators have been increasing every year. Since a compressor in the refrigerator consumes more than 80% of its total energy, it is necessary to reduce the energy consumption of the compressor. In this paper, the convective heat transfer coefficients on the compressor housing for both natural convection and forced convection were measured. Then, the effect of convective heat transfer coefficient on the power consumption of a refrigerator was investigated using a thermal management analysis. The results showed that convective heat transfer coefficient for forced convection is higher by 7.8 W/m 2 K compared to the natural convection. In addition, through the thermal management analysis, it was found that the increase in convective heat transfer coefficient reduces the refrigerator power by about 4.8% improving EER by 0.9%.



30MW급 유동층 연소로 내부 비반응성 유동장 수치모사

김진현, 오세천, 김우태

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.55-61

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The non-reacting flow field and the movement of sand particles inside a 30MW circulating fluidized bed combustor is numerically simulated via the finite volume method. The primary air is supplied through 23x23 array of nozzles located on the bottom and the secondary air is supplied through 12 inlet pipes located on the side walls. The steady state velocity field shows that a very complex flow pattern is formed in the lower part of the combustor. As the gas moves upward, the velocity magnitude decreases and the gas exits the combustor after hitting the top wall. To investigate the behavior of sand particles with different diameters, a particle tracking calculation is performed by introducing sand particles continuously at the z = 3 m plane. For the given air flow rate condition, sand particles smaller than 0.3 mm show a complex movement pattern near the secondary air inlet and then rise toward the outlet.



동절기 환경조건에서 파형 열교환기 배열에 따른 공기측 열전달 특성에 관한 연구

왕쩐후안, 변선준, 조은지, 권영철

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.62-67

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In this paper, we study the effect of cooling dehumidification process and wave heat exchanger on the reduction of white smoke and the efficiency by combination of heat exchanger with numerical analysis method. For this purpose, four types of heat exchange systems combined with 5-stage wave heat exchangers were selected to analyze the heat transfer characteristics of the heat exchange system in the winter condition. As the high temperature exhaust air flowed from HX 1 to HX 5, the final outlet temperatures of the four heat exchange systems(Cases 1, 2, 3 and 4) gradually decreased. The heat transfer rate and dehumidification amount were the best in Case 1 and Case 3, respectively. It can be seen that the heat flow in the heat exchanger is different according to the combination of the four kinds of wave heat exchanger and the fluid flow.



가솔린 직접분사엔진에서 EGR량에 따른 연비향상에 관한 연구

백동훈, 이수룡

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.68-74

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The effect of EGR on fuel economy was investigated in a gasoline direct injection engine. The 1-D cycle simulation program of GT-Power was utilized to evaluate fuel consumption rate. At high load, fuel consumption increased by about 2~6% according to EGR rate. Knock mitigation was the main effects, gaining about 80% of the total fuel consumption improvement. At low load, fuel consumption reduction was 0.6~2%, which was much lower than that for high load. The lower improvement of fuel consumption at low load is attributed to solely dilution and chemical effects of exhaust gas.



조화집중이동하중을 받는 철로로 부터의 음향방사

서양, 김병삼

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.75-81

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A theoretical model has been studied to describe the sound radiation analysis for a railway under the action of harmony line moving forces. When a railway is analyzed, it had been modeled as curved beams with distributed springs and dash-pots that represent the radial, tangential stiffness and damping of rail, respectively. The reaction due to fluid loading on the vibratory response of the curved beam is taken into account. The curved beam is assumed to occupy the plane y=0 and to be axially infinite. The curved beam material and elastic foundation are assumed to be lossless Bernoulli-Euler beam theory including a tension force(T), damping coefficient(C) and stiffness of foundation(K2) will be employed. The expression for sound power is integrated numerically and the results examined as a function of Mach number(M), wave-number ratio( ) and stiffness factor(ψ).



신경회로망을 사용한 증기표 전체 영역의 모델링

이태환, 박진현

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.82-88

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Simultaneous modelling was carried out using the neural networks with three inputs including a distinguishing variable for the steam table. It covered whole steam tables including the compressed, saturated and superheated region of water. And relative errors of the thermodynamic properties such as specific volume, enthalpy, entropy were compared using the neural networks and the linear interpolation method. As a result of the analysis, The neural networks has proven to be powerful in modeling the steam table because it has slightly better results than the interpolation method.



복합재를 적용한 작업 반경 30m급 고소작업차 붐의 구조적 안정성 해석

김진수, 국호형

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.89-95

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The aim of this paper is to clarify the structural stability of 30m fly(maximum working radius of 30m) and telescopic boom with composition. In order to reduce the weight and insulate, the boom of special vehicle has a 3-stage telescopic boom of DOMEX960, pocket part of acetal, 2-stage refracting boom of ATOS80, insulation boom of glass fiber composition and effector. In this process, CATIA is applied to create 3D modeling, then ANSYS are performed the structural analysis. The structural analysis is performed for a case where the thickness of the insulating boom of the ATOS 80 is 7[㎜] and the thickness of the insulating boom of the FRP material is 15[㎜] and 16[㎜].




샤프트 홀의 길이에 따른 A-IMS 튜블러 샤프트의 가공특성

염진섭, 서현규

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.96-101

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The objective of this study is to investigate the effect of tubular shaft hole length on the A-IMS production process in numerically. The hole length of tubular shaft was changed from 69.5mm to 79.5mm for distribution of load and stress. Then, the tubular shaft was modeled by S20C which was referred to program library. At the same time, the results of numerical analysis were compared in terms of under-fill, metal flow, principal stress, Von-mises stress and load characteristics. In the results, the load and stress were increased at 4 stage when the hole length of tubular shaft was increased. Also, folding phenomenon was observed to intensify as increasing the hole length of tubular shaft by confirmation of metal flow.



경운기 시뮬레이터의 조향제어장치 위치ㆍ토크 동시제어에 관한 연구

노재승, 김유용, 이정민, 홍순중

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.102-107

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The purpose of this study is to design and control position and torque based on the steering controller of power tiller simulator developed by the National Institute of Agricultural Sciences. The tiller simulator selects sensors and motors to detect the motion of the mechanism required for steering, and controls the tiller's steering controller through the PID control method and the PWM control method which can control simultaneously the position and torque. Simulation tests are carried out under various conditions to verify the efficiency of the proposed controller. The power tiller training simulator can be used as a means to prevent agricultural machinery accidents caused by human factors. Through the simulator, the driver can experience a variety of tasks without any risk of collision, the results of his actions, and learn the cause and effect concepts, which can be used for safety education and accident experience.



나노 스테이지와 볼나사 스테이지에서 커패시티브 센서 실험에 관한 연구


한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.108-113

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The capacitive sensors can be divided into two categories depending on their performance and intended use. First, high resolution sensors are commonly used in displacement and position monitoring applications where high precision, high stability, and low temperature drift are required. Often these sensors are used in process monitoring and closed loop feedback control systems. Second, proximity capacitive sensors are much cheaper and generally used for sensing the presence of parts or for counting applications. The following paper describes characteristics of capacitive sensor and application to the PZT nano and ball screw stage.



자석 가동자를 이용한 위치제어 시스템에 관한 실험적 연구

김홍윤, 김민수

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.114-119

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Since the encoder and resolver are expensive, it is difficult to apply it as a position sensor of a motor in a real industrial field. Optical position sensors, such as encoders and resolvers, are also difficult to mount because of their size and durability. Therefore, in order to solve these problems, we propose a system that uses a linear motor as a stator and a magnet plate as a mover, and a system that excludes a separate linear scale and uses two linear Hall sensors and permanent magnets to generate a conventional sine wave, A linear motor capable of detecting an absolute position and a movement position of a magnet, a control method thereof, and a technology development that can reduce a production cost by developing a position control system using a magnet mover that can improve stability and reliability.



스티어링 휠 다이나믹 댐퍼의 방진고무 강성 파라메터 연구

남재현, 박기완, 강재영

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.120-126

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The purpose of this study is to determine the stiffness of rubber of dynamic damper. This damper system reduces the steering wheel vibration caused by idling oscillation of the engine. Therefore, in order to measure the stiffness of the silicone rubber in the dynamic damper system, the material test of the silicone rubber was carried out. Using the measured stiffness, the FEM model of the dynamic damper system was constructed and the correlation by the experimental data was shown at an error of less than 2%. In addition, the dynamic damper system was simplified to a two-degree-of-freedom spring-mass model and the effect of the stiffness change of the rubber on the natural frequency of the column shaft was analyzed theoretically. As a result, the amplitude of the column shaft was reduced as the stiffness of the silicone rubber was lowered.



IMS 모듈의 튜블러 샤프트 요크와 스플라인 샤프트의 압입과정 개선에 관한 연구

민세훈, 염진섭, 서현규

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.127-133

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The objective of this study is to find the optimal size of splined shaft in IMS module. Two methods were used in this study. One is for the investigation of effect of indentation process on the tubular shaft yoke, and another is for the investigation of effect of indentation process on splined shaft. The spline outer size of splined shaft was increased from 0.00mm to 0.20mm. The simulation results were analyzed and compared in terms of under-fill, metal flow, effective strain, Von-mises stress and load characteristics. The indentation load was increased with increasing of spline size. However, in case of 0.15mm outer diameter increasing, the separation load was decreased. The case of 0.10mm diameter increasing was the best spline size based on the low indentation load and high separation load.



마이크로급 입자 제거를 위한 세척기 개발에 관한 연구

이태양, 한진호

한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.134-142

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In this study, we have devised an effective cleaning method of metal objects to be cleaned. The experimental setup of cleaning system was designed to adopt environmentally friendly cleaning agent, vacuum ultrasonic technology, micro-bubbles generator and vacuum drying technology. In order to maximize the cleaning effect, cleaning parameter’s conditions that can affect the strength of the cavitation are suggested. The effectiveness of the cleaning system using an alternative cleaning agent was verified by testing under the specified conditions.



Instructions to Authors 외


한국기계기술학회 한국기계기술학회지 제20권 제1호 2018.02 pp.143-155

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