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자성유체가 구동원으로 사용된 엑츄에이터에 대한 실험적 연구
김중(J.Kim),오창복(C.B.Oh),전운학(U.H.Chun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
The basic characteristics of actuator are a displacement, velocity and force of driving body. This paper describes the force among that of actuator. A length and diameter of straight tube are selected condition that can stabilize the magnetic fluid plug in the U-type tube. Load cell measures a force and response of magnetic fluid for a supplied voltage. A force that is generated by magnetic fluid in the straight tube have the magnetic body force, potential energy of a cluster and so on.<br/>
전운학(U. H. Chun),이행남(H. N. Lee) 한국자동차공학회 1993 오토저널 Vol.15 No.1
The reattachment lengths of the Non-Newtonian fluid are investigated in the sudden expansion pipes whose ratios are 2.316 and 3.368, and the range of the Reynolds numbers is 100- 30000. The reattachment lengths for the viscoelastic fluid in the laminar flow region are found to be much shorter than those of the Newtonian fluid. and decrease significantly with the increase of the concentration of viscoelastic fluid at the same Reynolds number. In the turbulent flow region, the reattachment length for the viscoelastic fluid is two or three times longer than those of water, and gradually increases with the increase of the concentration of viscoelastic fluid.
스프링-質量 系에서 磁性 流體의 振動 特性에 關한 硏究
전운학(U.H.Chun),이봉규(B.K.Lee),홍상록(S.R.Hong) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Under magnetism, as the magnetic fluid is being itself magnetized, increase the apparent viscosity because of its body force and has the magnetic characteristics in response to magnetism, the magnetic fluid is getting attention in various field.<br/> The magnetic fluid has the fluidity, which is a special characteristic of fluid and the magnetism, which is a special one of solid. Using this characteristics, this study has been proceeded to show the basic data for developing of a viscous damper with magnetism fluid as hydraulic fluid.<br/> Experimental study shows that the application of magnetic field is effective reducing the resonance characteristic of the spring-mass system.<br/>
[論文] 유동과 열전달 특성을 고려한 수평 전자회로 기판의 설계조건에 관한 수치적 연구
전운학(U.H.Chun),이행남(H.N.Lee),김현모(H.M.Kim) 한국자동차공학회 1992 오토저널 Vol.14 No.2
Flow and heat transfer characteristics in a horizontal electronic circuit board are studied numerically. The board has the arrays of heated blocks and the spaces between the plates and blocks are changed.<br/> Air is used as cooling fluid, of which prandtl number is 0.7. The velocity distributions, temperature distributions, Nusselt numbers and dimensionless friction factors are obtained on the spaces between the plates and the blocks, for the cases of Rayleigh number, 0 and 1O^5. When Rayleigh number is so large, such as 10^5, that the effect of bouyancy is not negligible, fluid friction and heat transfer is increased more than those of forced convection. This may be caused by the generation of secondary flow on the cross section of primary flow. The effect of bouyancy is of the most efficient, when the space of blocks is about block-width and the space of plates is about 1.7 times of block-height.
H. T. Hahn,전운학(U. H. Chun) 한국자동차공학회 1984 오토저널 Vol.6 No.4
에폭시 레진이 경화될 때 이들의 기계적 성질의 변화는 지금까지 주로 실험과 실험식에 의하여 구하여졌다.<br/> 근간에 이들의 변화를 이론적으로 구하기 위한 구성방정식이 본 발표자에 의하여 발표되었으나 실험데이타와 구성방정식 상호간의 정량적 관계가 정립되지는 못하였다.<br/> 본 연구에서는 세 종류의 시료, 즉 Epon 815/V140, Epon 820/Z와 DER 332가 경화될 때 이들의 기계적 성질을 구성방정식을 사용하여 구하여 초음과 방법으로 측정된 실험 결과와 비교 검토함으로써 에폭시 레진의 경화에 따른 기계적 성질들의 대부분을 제안된 구성 방정식으로 구할 수 있슴을 보였다.
이희상(H.S.Lee),황승식(S.S.Hwang),전운학(U.H.Chun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
In this study, the new method which is used by magnetic fluid for undercooling ends and continuous ice making is introduced to ice making in the ice stroage system and its validity is examined experimentally. This study made sure how shape change of magnetic fluid and instant explosure method can effect on the undercooling degree and its change by time change at the moments of undercooling ends and acquired the fundamental knowledge for control method about undercooling ends.<br/>