http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유연 회전축의 다물체 동역학 모델링 및 위상 조절법을 이용한 진동 제어
정훈형(Hoon-Hyung Jung),조현민(Hyeon-Min Jo),김재실(Chae-Sil Kim),조수용(Soo-Yong Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.1
This article proposes a new technique of the dynamic model using multi-body dynamic analysis tool for a flexible main spindle rotor system with a novel phase adjusting control technique for the purpose of an active control of rotor vibration. The dynamic model is used as a plant model. Also in order to make control system, a component parameters and phase controller is composed and simulated by SIMULINK. The vibration is reduced to 50%. Therefore the ADAMS dynamic model for the flexible main spindle rotor and the phase adjusting control techniques may be effective for the suppressing the vibration and helpful for the future active control for rotor vibration.
1.2㎿급 터보블로워용 틸팅패드 저널베어링의 설계에 관한 고찰
조현민(Hyeon-Min Jo),정훈형(Hoon-Hyung Jung),김재실(Chae-Sil Kim),조수용(Soo-Yong Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
This article provides the systematic design methodology for a tilting pad journal bearing. First the dynamic factors for the bearing are selected with the critical speed analysis. The pad bearing is then designed to have its best mechanical efficiency by simulations with changing of the number of pad and the lubricant flow rate with meeting the design specifications such as metal temperature, clearance and so on. And the simulation results are reviewed to compare with an experimental test. Finally the stability of rotor with the designed bearing is investigated. This methodology is successfully applied to the rotor for 1.2㎿ turbo-blower.
복합공구대 비틀림계 진동에 대한 기어 맞물림 강성의 영향에 관한 연구
김재실(Chaesil Kim),정훈형(Hoon-Hyung Jung) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
This paper describes the mathematical models of the indexing path and the mill driving path in the torsional geared driving system for a mill turret. The modal analysis for the models is conducted both with and without the gear contact stiffnesses. The comparison of eigenvalues leads to the effect of gear contact stiffnesses on the vibration of torsional geared systems for a mill turret.
Analytical Structural Integrity for Welding Part at Piping Penetration under Seismic Loads
Hun-Oh Choi(최헌오),Hoon-Hyung Jung(정훈형),Chae-sil Kim(김재실) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
The purpose of this paper is to assess the structural integrity of piping penetrations for nuclear power plants. A piping qualification analysis describes loads due to deadweight, pressure difference acts normal to the plate, thermal transients, and earthquakes, among other events, on piping penetrations that have been modeled as an anchor. Amodel was analyzed using a commercial finite element program. Apiping penetration analysis model was constructed with an assembly of pipe, head fittings and sleeves. Normally, the design load, thus obtained, will consist of three moments and three forces, referred to a Cartesian coordinate system. When comparing the stress analysis results from each required cutting position, the general membrane stress intensities and local membrane plus bending stress intensities during a structural evaluation cannot exceedthe allowable amount of stress for the design loads. Therefore, the piping penetration design satisfies the code requirements.
Chae-Sil Kim(김재실),Hoon-Hyung Jung(정훈형),Bong-Kwan Park(박봉관) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
High speed rotor systems with magnetic bearings have been the subject of much research in recent years due to the potential for active vibration control. In this thesis, optimal design was conducted for an 8-pole heteropolar magnetic bearing used in the flexible rotor of a turbo blower. In connection with bearing stiffness, this optimal design process was conducted using a genetic algorithm(GA), which is based on natural selection and genetics. The maximum stiffness of the magnetic bearing-rotor was found by considering the critical speeds of the flexible rotor. As a result, the magnetic bearings were optimized to have maximum stiffness.
한정우(Jeong Woo Han),김응경(Eung Kyeong Kim),정훈형(Hoon Hyung Jung),박영준(Young Jun Park) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.4
복합작업기는 트랙터에 장착되어 경운과 배토작업을 동시에 수행하는 다목적 밭작업용 농기계이다. 작업시에는 불규칙한 변동하중과 고하중을 받게 되므로 구조강도와 내구성 측면에서 매우 취약하다고 할 수 있다. 본 논문은 스트레인게이지 계측과 하중재구성기법을 활용하여 복합작업기의 작업하중이력을 도출하는 방법에 관한 연구이다. 복합작업기 구성품인 디스크 해로우의 구조해석결과를 토대로 변형률응답특성이 최대가 되는 최적의 응답지점을 찾고, 변형률응답특성이 독립적 상관성이 보장되는 범위에서 스트레인게이지 수량을 결정하였다. 필드 테스트에서 얻어진 계측 데이터는 신호 필터링을 통해 트랙터속도가 14 ~ 16 km/h 구간의 변형률이력을 도출하고, 하중재구성기법을 적용하여 하중이력으로 재구성하였다. x, y, z 방향의 하중 벡터를 합성하여 피로손상이 가장 큰 피로하중의 주방향을 찾았으며, 모든 하중을 주방향 축으로 투영시켜 등가하중이력으로 변환하였다. A composite working implement is an agricultural machinery work tool that performs simultaneous cultivating and ridging. This may be critical in terms of structural strength and durability, because these implements are subjected to irregular, random, and high loads during work. In this research, a load reconstruction technique utilizing strain gage signals measured with field tests was used to derive load histories for a disk harrow mounted on the composite working implement. Additionally, the optimum points at which the strain response reaches maximum were found using the disk harrow finite-element analysis results. A method is proposed for reconstructing the load histories from measured strain data at a tractor velocity of 14~16 km/h, identifying the principal direction with the highest fatigue damage direction in the x-, y-, and z-axes, and projecting loads on the axis for conversion into an equivalent load.
복합공구대 비틀림계 진동에 대한 기어 맞물림 강성의 영향에 관한 연구
김재실(Chae-sil Kim),김수태(Soo-Tae Kim),조수용(Soo-Yong Cho),정훈형(Hoon-Hyung Jung) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.2
This paper describes mathematical models of the torsional geared driving system for the indexing path and the mill driving path in a mill turret. The eigenvalue analysis for the models is conducted both with and without the gear contact stiffnesses. The natural frequency leads to the effect of gear contact stiffnesses on the vibration of torsional geared systems in a mill turret. It is necessary to analyze eigenvalues of the complex geared torsional system in order to prevent the unexpected vibrations.