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반응표면법을 이용한 솔레노이드형 자기액추에이터의 치수 최적화 설계
소현준(Hyunjun Soh),유정훈(Jeonghoon Yoo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Solenoid type magnetic actuator is the device, which could translate the electromagnetic energy to<br/> mechanical force. The force generated by magnetic flux, could be calculated by Maxwell stress tensor method.<br/> Maxwell stress tensor method is influenced by the magnetic flux path. Thus, magnetic force could be<br/> improved by modification of the iron case, which is the route of the magnetic flux. Modified design is<br/> obtained by parameter optimization using by Response surface methodology.
소현준(Hyun-Jun Soh),박순옥(Soon-Ok Park),유정훈(Jeonghoon Yoo) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.6
As the automobile energy efficiency stands out an important matter of interest, the magnetic engine valve system receives attention. It has an advantage of no engine power leakage in opening and closing the valve. Moreover, it generates much bigger force than the piezo actuator system, so it can be a good alternative system of the cam and camshaft system. However, since the valve system is not light enough, it is necessary to make its weight reduce. In this study, topology optimization is applied to find the optimal shape of the armature in a magnetic valve system combined with the finite element analysis for the magnetic field analysis. The result is used to obtain a concept design. The adjoint variable method is employed in order to calculate the design sensitivity of the magnetic driving force in the armature component mostly to reduce the computational time during the repeated sensitivity calculation. The sequential linear programming is employed for the optimization algorithm.
열보조 자기기록장치용 광도파로의 격자결합구조 위상최적설계
소현준(Hyunjun Soh),유정훈(Jeonghoon Yoo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Heat assisted magnetic recording(HAMR) is the alternative system to overcome the storage density limit of the current magnetic recording. Heating the media helps the magnetic recoding in low coercivity, and the nano-size heating beam is necessary to obtain terabit storage density. Since it is difficult to get the nano size beam spot due to the diffraction limit of the light, the grating coupler structure using surface plasmon effect is used for the optical system to reach the small spot size beam on the media. This study proposes the method to design the grating coupler for HAMR head optical system using topology optimization. The design domain is the core layer composed of tantala material having the high refractive index, and the light flows along the core layer. The grating coupler structure is between the core layer and the cladding layer, and the cladding layer is composed of alumina material having the low refractive index. The objective function is set to maximize the coupling efficiency on the beam energy flux measuring domain.
반응표면과 실험계획을 이용한 브레이크 응력해석의 하중조건 개선
소현준(Hyunjun Soh),유정훈(Jeonghoon Yoo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In finite element analysis, it is difficult to get the analysis result of the single component analysis as precision as that of full system model analysis. However, it is used more popularly, since it need less time than full system model analysis. To obtain the precision analysis result, it is needed to apply more detailed boundary conditions. In this research, the establishment methodology of improved load boundary condition may be introduced. In order to get the approximate result with rig test result, strain values are compared. The each of partial load condition, as the equation form of the braking torque, is obtained using response surface method and design of experiments.
소현준(Hyunjun Soh),문신(Shin Moon),윤규원(Kyuwon Yoon),박춘기(Choonki Park),박주상(Joosang Park),장세인(Sane Chang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Squeal is generated by system instability, which is caused from friction energy to make a brake system exciting. Squeal could be predicted from instable mode, which is the result of complex eigenvalue analysis. In this study, to confirm the accuracy of the analysis process, the results of instability analysis is compared with that of dynamo test, and then, to improve the squeal noise of the brake system, the structure of carrier is alternated, which is the most affective part of 2.4㎑ system mode.
570MPa급 고강도강을 적용한 콘크리트 채움 U형 하이브리드 합성보의 휨거동 및 설계
이철호,소현준,박창희,이창남,이승환,오하늘,Lee, Cheol Ho,So, Hyun Joon,Park, Chang Hee,Lee, Chang Nam,Lee, Seung Hwan,Oh, Ha Nool 한국강구조학회 2016 韓國鋼構造學會 論文集 Vol.28 No.2
본 연구에서는 콘크리트 채움 U형 하이브리드 합성보의 실물대 휨 실험을 수행하고 평가하였다. U형 강판의 웨브에는 공칭인장강도 400MPa 일반강종의 강재(SS400) 하부플랜지에는 공칭인장강도 570MPa 고강도 강재(SM570)의 강판을 각각 적용하였다. 연구의 주요 목적은 최대의 휨성능을 발현할 수 있는 하이브리드 단면구성과 설계지침의 개발이었다. 4점 단조가력실험의 수행을 통해 제안된 모든 하이브리드 합성보 실험체들은 의도한대로 소성모멘트 이상의 강도발현과 충분한 연성거동을 나타내었다. 그리고 하이브리드 합성단면의 소성중립축의 위치가 상부 콘크리트 기준으로 합성단면 전체깊이의 15%이내에 존재할 경우 휨강도 산정 시 소성응력분포법의 적용이 가능할 것으로 판단되었다. 또한 실험결과를 기반으로 하이브리드 합성보에 적합한 강성산정과정을 제안하였다. Flexural tests of full-scale concrete-filled U-shape hybrid composite beams were conducted. Ordinary (SS400) and high-strength (SM570) steel plates were used in the web and in the bottom flange of U-shape steel section respectively. The primary objectives were to develop the hybrid section configuration with maximized flexural capacity and to investigate its flexural strength and deformation capacity. All the hybrid test specimens in this study exhibited the plastic moment capacity and resonable deformability. It is shown that the plastic stress distribution can be assumed in calculating the flexural strength of the proposed hybrid composite beams if the plastic neural axis is located within 15% of the total beam depth from the top of the composite slab. The procedure for computing the effective flexural stiffness of hybrid composite beams is also recommended based on test results.