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
제18권 제4호 (21건)



스풀밸브의 노치형상에 따른 유동 특성에 관한 연구

이태근, 김태규, 김대호

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.489-496

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To control the flow of fluid, several kinds of valves are used. Especially, Main Control Valve (MCV) is the key element of hydraulic system which performs complex control not only controlling the flow of fluid, but also prevent damage of equipment by supplying proper hydraulic pressure to actuator and draining over-supplied hydraulic pressure. While general control valves are producing in domestically, entire quantity of main control valves are depended on importation and it depreciates competitiveness in cost, and time. In this study, to derive the best design of notch structure by following the orifice flow of 6-linked main control valve and the relation between “notch structure” which is the most fundamental element to control the velocity of the fluid and “pressure distribution”, the flowcharacteristic is compared by comprehending hydraulic pressure and velocity of the fluid using CFD simulation when spool valve is used for “meter-in” and “meter-out” through the opening of the notch structure.



마이크로 드릴에 의한 구멍 가공시 드릴의 손상과 구멍의 관찰


한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.497-502

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In this study, i machined micro hole to PCB(Printed circuit board) with ultra precision spindle system for mechanical micro drilling. For this i utilized 0.4∼0.6 ㎜ micro drill and observed cutting edge and hole. Results are as follows; in case of drilling with 0.4∼0.6 ㎜ micro drill, micro hole was made specific range of diameter up to 300 times drilling and micro drilled diameter was bigger than micro drill’s diameter at 300 times over. Error ratio of drilled diameter and damaged hole diameter was within 5 % and 17 %. I observed 0.4 ㎜and 0.6 ㎜micro drill’s cutting edge after 500 times drilling and confirm cutting edge width variation and damage, same result found 1000 times drilling with 0.5 ㎜ micro drill.



기계구조용 탄소강(SM20C)의 절삭력에 관한 연구

이이선, 배명일

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.503-510

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In this study, we conducted an interrupted cutting SM20C with lathe and uncoated carbite tool, determined the relationship between Cutting Forces(principal, radial, feed force) by correlation analysis, and predicted the optimum cutting conditions by multiple regression analysis. The result were as follow. : From the correlation analysis, the increase of cutting speed and depth of cut reduces the principal force and radial force. the increase of cutting speed, depth of cut and feed rate will increase the feed force. From multi-regression analysis, we extracted regression equation and the coefficient of determination (R2) was 0.638, 0.692, 0.536 at principal, radial and feed force . It means that the regression equation is not high accuracy. However, it is predictable that the tendency of the forces action the interrupted cutting.



CNT의 배향 길이에 따른 CNT-Polyamide 복합재의 특성 변화 연구

김경재, 송준혁, 박영수, 오제하, 강신재, 양성모

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.511-516

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The characteristics of CNT-Polyamide composites were analyzed, that is, tensile strength, electrical resistivity, and thermal conductivity were measured according to the align length of CNT. There have been researches on the influence of aligned CNT to improve the mechanical and thermal characteristics in different areas including absorption and shielding of electromagnetic wave, thermal distribution or absorption, and high-strength of CNT. The aligned CNTs were synthesized by the ethylene gas with a CVD device preheated at 650℃. CNT-Polyamide composites were produced with the mixing of solution. CNT contents were controlled from 1phr to 50phr in the polyamide-ethanol solution, and blended with the 700W bar-type ultrasonic wave for 60 min.. And then CNT-polyamide were precipitated by CNT- polyamide-etnanol falling into the cold water. After dried 12 hours, CNT-polyamide composite were pressed at 150℃~180℃ with 400kgf to get the thickness of 1mm. As the conclusions, aligned CNT bundles were dispersed by cutting of CNT to the aligned direction because of polyamide properties. Tensile strength and electrical resistivity were improved to the increase of aligned length of CNT. Thermal conductivity was little affected by the align length of CNT.



마그네틱실 설계변수에 따른 STS630의 홈가공 절삭력 변화

김형철, 이이선, 배명일

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.517-522

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This study investigates on the tuning stainless steel(STS630) to understand for groove cutting characteristics. For this purpose, we observed the cutting force according to feed rate and cutting speed variation and performed the computational analysis due to groove cutting depth. In groove cutting of stainless steel, there were principal force, feed force and radial force by arranging the highest cutting force in order. In case of wall thicknesses of 0.3mm and 0.5mm at groove cutting, principal force increases according to the increase of feed rate but it is not related to cutting speed. We found the unstable region of cutting force that is caused to the friction resistance of cutting tool and elastic deformation of groove wall. In computational analysis, we confirmed that the more feed rate increases, the more strain increases around the tooth root.



적층각도를 가진 모드 Ⅱ CFRP 시험편의 접착 피로특성에 의한 구조안정성 평가

황규완, 조재웅

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.523-528

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CFRP hardened by carbon fiber and resin has the property of high strength and low weight. Specifically, the strong feature against the external vibration environment is shown as CFRP is designed with the structure of multi-axes. So, CFRP in place of metal has been used at the various fields. CFRP specimens for mode Ⅱ are applied with the repetitive fatigue load in this study. These specimens have the fiber layer angles of 30°, 45° and 60°. The material properties of specimens are investigated with the result of fatigue fracture due to this load. As the study result, the smallest and largest reaction forces of 500 N and 540 N are shown at the layer angle of 30° and 60° respectively among these specimens. The separation of adhesive interface at 4000 fatigue cycles is happened earliest in case of the layer angle of 60°. But the separation of adhesive interface at 11000 fatigue cycles is happened latest in case of the layer angle of 45°. Through the result of fatigue property, it is thought that the basis data can be applied to evaluate the safety at CFRP structure applied with fatigue.



PID제어기와 퍼지제어기를 이용한 유연한 로봇팔 끝 지점 위치와 진동제어에 관한 연구

이현철, 김성철, 오재윤

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.529-535

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Recently, a study on reducing the weight of the robot arm, which enables a high-speed operation and enables reducing the energy consumption has been actively carried out. A lightweight robot arm is hard to control because it behaves like a flexible body rather than a rigid body. This paper proposes a controller which combines a PID controller and a fuzzy logic controller for control the position and vibration of the flexible robot arm. In order to show the effectiveness of the proposed controller, MSC.ADAMS computational model which incorporates the finite element flexible robot arm model is developed, and is used for performing simulations. Simulations are carried out with two reference inputs, and three end masses. Simulation results show that the proposed controller controls the position and vibration of the flexible robot arm adaptively without being affected by the reference input and the end mass.



도시철도차량 궤도변화에 따른 실내소음 특성에 관한 연구

김현식, 양성모, 김병삼

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.536-542

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In this paper, interior noise that is brought into inside of coach when it passes by straight line track, railway turnout section, curved track, and rail lubricator section with test coach was measured in accordance of track characteristic of urban railway vehicle. It was evaluated with 60km/h of constant speed in the motorized trailer, no.3 car T1 motorized trailer of urban railway vehicle. Interior noise characteristic value is higher in order of curve, rail lubricator, railway turnout, and straight track as a result of the test. The highest characteristic value is 86.7dB in the curved track. And, the lowest characteristics value is 75.5dB(A) in the straight track. For accurate result comparison, it is transformed into sound pressure distribution by time domain, sound pressure level by time domain, sound pressure level for frequency domain and completed analysis.



CAE를 이용한 자동차용 휠캐리어의 경량 설계


한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.543-549

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In order to obtain the goal of the weight reduction of automobile components, the researches about lighter and stronger wheel carriers have been studied without sacrificing the safety of them. In this study, the weight reduction design process of wheel carrier could be proposed based on the variation of von-Mises stress contour by substituting an AA6061 (aluminum 6061 alloy) having tensile strength of 310 MPa grade instead of FCD600 Irons. From the stress analysis results before and after design modification, the stress relaxation was done at every given loading conditions. Therefore, it could be reached that this approach method could be well established and be contributed for light-weight design guide and the optimum design conditions of the automotive wheel carrier development.



알루미늄으로 된 자동차 시트 프레임의 내구성 평가에 관한 연구

박재웅, 국정한, 조재웅

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.550-555

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An aluminum with the light weight has been used at the automotive car body. As the aluminum is applied to the automotive seat, the optimum design becomes important by investigating the mechanical properties. This study aims at suggesting the basic data for the optimum design of automotive seat frame. In this study, the mechanical properties are investigated through the simulation analysis on the entire structure of seat frame. Two study models using the real commercial vehicles are designed with CATIA program and analyzed with ANSYS program. The harsh condition during the driving state is supposed by using the analyses of natural frequencies and harmonic responses. As the real frequency ranges in this study are set by selecting the natural frequencies through modal analysis. The critical frequencies are analyzed by harmonic response on which the driver is seated. The values of maximum equivalent stresses at models 1 and 2 are shown to be 18.073MPa and 2259.2MPa respectively. The critical frequency at models 1 and 2 are also shown to be 77 Hz and 206 Hz. The maximum stress at model 1 becomes far bigger than model 2. By comparing two models, model 1 has more critical condition than model 2. At the design of automotive seat frame at the dynamic vibration condition, the material of design with the durability and safety can be secured through this study result.



열교환기의 관 배열방식에 의한 열전달특성

금국빈, 박태준, 김도현, 이관석, 금성민

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.556-562

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The purpose of this study was investigated heat flow and heat transfer coefficient characteristics of around tube when changing the tube arrangement type and heat transfer area. When NL≒1∼4, convective heat transfer coefficient of staggered and aligned arrangement was increased. Growth rate of the heat transfer coefficient becomes smaller in case of NL≒5∼8 because a change in the turbulence was very small. At the staggered arrangement, all tubes were always arranged in front of the open passage between the back of the tube. Then, the entire surface area of the tube was exposed to the main flow. Thus growth rate of heat transfer coefficient appear larger than aligned arrangement.



유한요소법을 이용한 팬터그래프-전차선 동적상호작용 시뮬레이션 정식화 및 검증

조용현, 이기원

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.563-570

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Formulation of the finite element method(FEM) for dynamic interaction between a pantograph and contact wire, including non-linear formulation associated with contact wire stagger in the railway overhead contact line is presented. Penalty method is chosen for modelling contact between a pantograph and contact wire. The formulation is validated by comparing the simulated contact forces with measurements taken from 300 km/h KTX operation.



도로용 삭초기 헤드시스템에 대한 구조 및 피로특성 분석

허진석, 임현호, 이상호

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.571-578

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The characteristics of stress distribution and fatigue life have been investigated in the road mower head system using FEM(Finite Element Method). There is high stress distribution around the coupling part with non-uniform load from the irregular road surface. Maximum equivalent stress especially occurs in the fixed plate and the pillar of the head device with maximum deformation at the rotation axis frame of the mower system. Fatigue life tests were also performed with SAE bracket history, SAE transmission, and sample history conditions. SAE bracket history and SAE transmission predicted the possibility of high damage while Sample history showed a stable trend. These results will be applicable in optimal design for various systems equipped with mower head system.



고점도 바이오디젤의 간접분사식 디젤기관 적용

최승훈, 김홍석

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.579-584

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Biodiesel as alternative energy source of the traditional petroleum fuels has increased interest, because environmental pollution based exhaust emissions from vehicle became serious. The advantage of biodiesel produced from esterification of vegetable and animal oils can be used without the modification of existing diesel engine, but glycerin is generated by production process. In this study, the usability of non-esterification biodiesel as an alternative fuel was investigated in a indirect injection diesel engine. The non-esterification biodiesel has not generated glycerin in esterification process and reduced the 20 percent of cost because it has not used methanol in the production process. Experiments were conducted by using the 5, 10 and 20 percentage of biodiesel and 4 and 8 percentage of biodiesel with 1 and 2 percentage of WDP in baseline diesel fuel. The smoke emission of biodiesel was reduced in comparison with diesel fuel, but power, torque and brake specific energy consumption was similar to diesel fuel.




고정밀 이형압연 자동 제조장치의 현장 적용 평가

오익수, 김봉석

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.585-590

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Wire rods having various sectional shape are generally used in various applications. In a 2-roll shape rolling process, step-by-step rolling operations are executed repeatedly and the rollers must be changed whenever the sectional shape of wire rod is changed. The frequent changes of the rollers and discontinuous repeated operations are cause various shortcomings such as increase of manufacturing cost and reduction in precision. We had developed a high precision automatic wire rod manufacturing system to reduce these shortcomings in the previous study. In this study, we evaluated the field application performance of the developed system in terms of straightness, thickness deviation, surface precision, tensile and hardness of the wire rod in order to verify the feasibility of the system.



충격하중에 대한 감속기 내충격성 개선 연구

윤효진, 남윤욱, 김경로

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.591-596

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During the field operation of the Korean MBT(Main Battle Tank), the multi- smoke projectile launching system failed to function. As a result of conducting analysis, it was confirm that the gear shaft of reducer was failed. Therefore, a study on improvement in impact resistance of the reducer was conducted. The reducer was improved impact resistance by changing the design and material of gear shaft. The reliability of modified reducer was investigated by finite element analysis, performance and environmental tests. As a result of analysis, a strength of the modified gear shaft was improved by about 20 times than before improvement. The results of performance and environmental test show that the modified reducer is applicable for Korean MBT under the severe conditions. The quality improvement of multi-smoke projectile launching system contributes to survivability of Korean MBT.



20mm발칸포 보조전원공급장치 개선 연구

조연식, 유영수

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.597-601

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20mm Vulcan is one of the representative weapon system that widely operated in army, navy and airforce in Korea. But unstable power which is caused by bad battery cells or insufficiently charged battery box has often caused malfunctions when Vulcan barrel is working. This paper is about improvements of maintenability of APS which is used charging the battery box. The main improvement effects are as follows. First, Break-down of the Power Transistors(PT-8502) inside APS can be prevented by limiting over.current. Second, Automatic charging the battery box is possible by using Micro Controller Unit and SSR. Third, The charging status of battery box can be checked and deficient battery cells recognized by adding LED.



가상현실 연동 도로주행 자전거 개발

조민수, 이근주

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.602-607

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This research focused on Road Bike synchronized with the virtual reality software. To clarify the effectiveness of exercise using a indoor Road Bike synchronized with the virtual reality software in this research, the changes of stress index were observed between synchronized status of Road Bike hardware and virtual reality software and not synchronized status. The virtual reality Road Bike which is synchronized with 3D virtual reality environment and mechanically works the same way with real bike allows a users not only to increase the effectiveness of exercise but also to reduce significantly the boredom compare to traditional indoor bike. The prototype of virtual realty Road Bike has been completed, detailed research will be conducted in the future to increase a user‘s safety and provide a more similar experience with real Road Bike for adapting various industry fields especially in the game industry.



쉘터의 스키드 조립체 및 격벽 구조해석을 통한 강성개선 연구

권재욱, 김용수, 임희준

한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.608-614

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Shelter that communication equipment and on-equipment material are mounted on is transported by airplane or vehicle, it has a function such as waterproof and shielding EMI. When the shelter is transported by car or helicopter, it is shocked by vibration and crash with the ground. So, three skids are attached to bottom of the shelter to reduce the shock. To confirm the durability of the structure of shelter, parallel drop and rotating drop test were done in accordance with KDS 0000-0000. However, the damage was discovered in the shelter. So, stiffening plate was added to skid and panel of partition wall to obtain durability and changed the shape of rubber buffer. In this paper, the cause of deformation and damage in the shelter was analyzed and improved shape through the structural analysis was verified.



원형 개비온 자동말림장치 개발


한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.615-620

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Manual process of the workpiece into the environment with a pleasant to complement the disadvantages of increasing the efficiency of an automatic production process, and to develop the results were obtained as follows. automatic curl the average 2.99 rotation in the machine curling turns have been identified a failure of the product Is about 0.417% to have been identified. per minute of the machine producing the number of the product has been confirmed to 5.114 average. automatic curl a result, the production rate is two times of the machine.



3차원 좌표측정의 셋업 변동성 및 측정불확도 추정 결과 비교


한국기계기술학회 한국기계기술학회지 제18권 제4호 2016.08 pp.621-627

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All measurements include uncertain factors affecting the result in accordance with environment and conditions. In order to guarantee right decision making and quality improvement, these factors must be found and appropriate actions should be taken. This paper aims to estimate and analyze variabilities found in set-up and as well as measurement uncertainty when using CMM(Coordinate Measuring Machine). Two skilled operators were selected to individually measure a product which was a kind of main part of an engine called connecting rod cap. The results showed that at the least, 10 % was stable while at the most, 30 % was somewhat unstable regarding P, percentage of measuring errors. There was little difference between the two operators on measurement uncertainty expecially considering their degree of freedom based on their objective and subjective judgement of type B uncertainty despite the significant difference between them. Through this research, I have come to a conclusion that a much more detailed analysis on variation factors can be identified in general measurement by using CMM and the result of set-up variability demands specific investigation and efforts to improve operators’ skill or thorough examination on the method of setting product to minimize set-up variability later.


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