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
제12권 제2호 (12건)



취성접착제를 사용한 접착이음의 강도평가에 대한 해석


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.1-8

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The crack initiation equals to fracture for bonded joint with brittle adhesive. The criterion is formulated in terms of the quasi-stress intensity factor Kp, for the maximum principle stress, that is analogous to the stress intensity factor used to characterize the stress field in the vicinity of bond terminus. Kp is evaluated using a boundary element analysis. The crack initiation at the terminus of adhesive bonded joints is estimated with the critical quasi-stress intensity factor Kp. This method presented here hardly pays attention to the crack propagation. Since there is a large influence of crack propagation on the strength of adhesive joints and structures, crack propagation must be taken into account on strength prediction of bonded joints. The quasi-stress intensity factor Kp for the maximum principle stress can use as the criteria of the crack initiation at the terminus of adhesive bonded joints having various shapes.



실험계획법에 의한 Al-2024의 고속 정면 밀링가공과 신뢰성 검토


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.9-15

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This paper presents a study of the influence of cutting parameters on surface finish obtained by face milling. Cutting conditions have significantly great effect on surface quality in high-precision machining. Fundamentally, surface roughness are strongly correlated with cutting parameters such as feed rate, cutting speed and depth of cut. Optimal selection of the cutting parameters can obtain better surface roughness. Therefore, optimization of the cutting parameters in a face milling based on the parameter design of the Taguchi method is adopted in this paper to improve surface roughness. And optimal cutting parameters based on the results of the S/N ratio and ANOVA analyses to performance high-precision machining is obtained and verified by confirmation test.



에너지사용계획 협의 향후 효과 예측 분석


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.17-22

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The Consultation about Energy Use Plan is prescribed by the Rational Energy Utilization Act. This paper proposes a regression model for estimating consultation objects each year. Analysis results predict for the next six years that the mean annual energy saving effect is 13.2%, mean annual CO2 reduction effect is 13.4% and benefit-cost ratio is 2.48, it means economic and social future effect with the Consultation about Energy Use Plan are very excellent. Also the effect of introducing system improving efficiency of energy use is expected to account for 62%, recovering waste heat account for 17%, introducing group energy supply account for 18% and utilizing new․renewable energy system account for nearly 3% of total energy savings on plan for improving efficiency.



공동현상이 발생하는 스퀴즈 필름 댐퍼에 지지된 탄성 회전체의 진동제어


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.23-29

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The vibration control of a flexible rotor supported on cavitated short squeeze film dampers is investigated. According to Pan's theory, the shape of cavitation in fluid film bearings depends on the level of oil supply pressure, as a result, both the direct and the cross coupled damping coefficients of a cavitated short squeeze film damper are varied widely. In this paper, controling the level of oil supply pressure by fuzzy theory, a significant reduction in journal eccentricity ratio, rotor amplitude and force transmissiblilty of a flexible rotor system is achieved.



보텍스튜브를 이용한 비압축성유체속의 고체분말분리에 저온출구 오리피스 지름비가 미치는 영향

최병철, 김병하

한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.31-36

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Recently, the Ranque-Hilsch vortex tube is widely used for the local cooler of industrial equipment for special purpose. Although many studies on energy extraction in the vortex tube using air as the working fluid have been made so far, a few experimental studies treated solid particles extraction for incompressible fluid. So, an experimental study for the solid particles extraction in the vortex tube(Ranque-Hilsch vortex tube) using the water which is essentially an incompressible fluid is presented. The experiments were carried out with various cold end orifice diameter ratios ranging from 0.25 to 0.70, the input pressure ranging from 1 to 3MPa was considered. The emphasis was given to examine the effect of geometry factors of vortex tube at working fluid(water) for solid particles(Al2O3) extraction. The optimum geometry factor and inlet pressure for the maximum solid particles extraction was found that the smaller cold end orifice diameter ratio and the higher inlet pressure in experimental condition increase.



ALE 스킴의 래티스볼츠만 모델에의 적용(회전하는 타원체로부터 발생하는 유동소음 해석)


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.37-45

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Numerical solutions are presented for compressible fluid flow past a rotating elliptic cylinder in a medium at rest at infinity. Flowfields and acoustic waves emitted from rotating elliptic cylinder are directly simulated by the Lattice boltzmann method formulated by the Arbitrary lagrangian eulerian scheme. The flowfield is almost periodic after the calculation fully developed and studied by means of streamlines and equi-vorticity lines and by means of drag, lift and moment coefficients. The positive and negative vorticity is alternately occurred at the edge by those large vortexes. The acoustic waves propagate synchronizing with the rotation and increase with M3.5 of rotational speed of elliptic cylinder.



수정보급모형을 이용한 최저효율제 시행에 따른 고효율전동기의 보급추이 분석에 관한 연구

황성욱, 정훈

한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.47-51

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In this paper, the situation of energy efficiency standards and MEPS (Minimum Energy Performance Standard) for motors and diffusion states are analyzed. For this purpose, a new methodology is used, which was proposed in the existing study, using diffusion models and learning curves. The existing diffusion models could not explain affects from new appliances' penetration during the diffusion. But a mixed diffusion model with learning curves or learning ratio is studied to explain this penetration.



카트 동역학 해석을 위한 주행분석장치 개발 및 성능평가


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.53-60

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Kart-Racing which is called a microcosm of F1`s racing is the most basic step in the car racing. A Kart consisting of the very fundamental structure which does not include differential gear and suspension is sampler than a typical car. It is necessary to reduce the Lab time at the Kart-racing`s corner so the research investigate the Kart through check of racing condition and of driving factors about cornering. The study measured to make the kart closely factual condition which was showed the main parameters for more actual decision of kart`s dynamic characteristics and estimated the real-time data from the developed kart whose sensor was installed at all tires and which was pursued through the GPS.



잔류응력을 고려한 필렛 가스용접 이음재의 수명예측과 신뢰도 평가

백승엽, 오선

한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.61-66

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Gas welding is a very important and useful technology in the fabrication of railroad cars and commercial vehicle structures. However, since the fatigue strength of gas-welded joints is considerably lower than that of the parent material due to stress concentration at the weld, the fatigue-strength assessment of gas-welded joints is very important for the reliability and durability of railroad cars and the establishment of a criterion for long-life fatigue design. In this paper, in order to save time and cost for the fatigue design, an accelerated life-prediction method that is based on the theory of statistical reliability was investigated. Its usefulness was verified by comparing the (Δσa)R-Nf relationship that was obtained from actual fatigue test results with the (Δσa)R-(Nf)ALP relationship that was derived from accelerated life testing. And the reliability of the predicted life was evaluated. The reliability of the accelerated life-prediction on the base of actual test data was analyzed to be (81~86)% of the actual test life of the fillet-type gas welded joint.




슬라이더 관절을 갖는 로봇 액츄에이터 메커니즘 개발


한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.67-73

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This study is concerned about the robot joint mechanism with the slider joint. Most of robots are sliding using rolling bearing, cam follower or roller follower in the slider joint. Because such structure must impose pre-load so that outer ring of the bearing may have suitable contact force on contact side, when used many long term, life is fallen, and become factor of rising prices because must do precise machining about parts that use. This research proposes method to solve such problem. This research applies method to use sliding bearing instead of rolling bearing and develope mechanism that can operate for this. Also, this research develops structure that can transmit power using gear to reduce cost price. And optimal design for gear and main parts is achieved.



배전선로 점검로봇의 경량화 및 열화설비의 불량 검출 모니터링 프로그램 개발

고석조, 박민규, 김진봉

한국기계기술학회 한국기계기술학회지 제12권 제2호 2010.06 pp.75-80

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In order to supply the high-quality electric power, several researches have been conducted. For the high-quality power, it is necessary to inspect the power lines and insulators before the lines or insulators are disconnected or damaged. However, it is not enough to inspect all the power lines by human inspectors. In previous study, a power line inspection robot was developed to investigate the power lines and insulators. According to replace the human operators by the robot, the inspection robot has several advantages: the improved working conditions, machine accuracy, and the prevention of accident. However, the robot has some defects in its heavyweight. In this study, a lightweight inspection robot has been developed using a RP and a vacuum casting. And, this study developed a fault detection monitoring program for the high voltage equipment using a microphone which detects the location of fault and the thermal imaging and CCD cameras which verifies the fault and stores the image, respectively.


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