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유춘성,홍동표,정태진,정길도,Yu, Chun-Seung,Hong, Dong-Pyo,Chung, Tae-Jin,Chung, Kil-To 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.9
A cantilever beam with a mass and a spring at the end can be use to model a miniature flexible arm. It is necessary to know the natural frequencies and mode shapes to discuss its free vibration, especially when modal analysis is employed. A beam is clamped-free. In this paper we look at the lateral vibration of beams that have step changes in the properties of their cross sections. The frequency equation is derived by Bernoulli-Euler formulation and is sloved by the separation of variable. The parameters of the beam, 'mass and spring stiffness' are defined as nondimensionalized parameters for wide application of the results. According to the change of eigenvalues and mode shape are presented for this beam. The results presented are the eigenvalues and the natural frequencies for the first three modes of vibration. Results show that the parameters have a significant effect on the natural frequency.
이재정,유춘성,홍동표,정태진,정길도,노태수 한국소음진동공학회 1996 소음 진동 Vol.6 No.5
This paper is concerned with the theoretical and experimental study on the force control of a miniature robotic finger that grasps an object at three other positions with the fingertip. The artificial finger is a uniform flexible cantilever beam equipped with a distributed set of compact grasping force sensors. Control action is applied by a piezoceramic bimorph strip placed at the base of the finger. The mathematical model of the assembled electro- mechanical system is developed. The distributed sensors are described by a set of concentrated mass-spring system. The formulated equations of motion are then applied to a control problem in which the finger is commanded to grasp an object. The H$_{\infty}$-controller is introduced to drive the finger. The usefulness of the proposed control technique is verified by simulation and experiment..
이삼래,유춘성 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
An accurate evaluation of the neutron exposure to the materials comprising the beltline region of the reactor vessel is performed through a neutron dosimetry analysis where a fluence calculation is done by both measurement of the dosimeter materials removed from surveillance capsules and a neutron transport calculation. Once all the capsules have been completely removed from the reactor vessel in a typical Korean PWR, ex-vessel sensor sets are installed as a substitute capsule in an axial direction in the reactor cavity and then removed for an analysis. All transport calculations were carried out by using the DORT 3.1 discrete ordinate code and the BUGLE-96 cross-section library which provides 67 group coupled neutron-gamma ray cross-section data set. In order to determine the calculated reaction rates for each dosimeter sensor, the dosimeter cross-section library, SNLRML, was used. The results that have been performed on one of our reactors during the consecutive fuel cycles showed that the differences between the measurements and calculations by the ex-vessel neutron dosimetry sensors are less than 20% for each capsule, which satisfy the acceptable criterion.
Equivalent Pre- Xenon-Oscillation Method for Core Transient Simulation
송재승,이창규,이정찬,유춘성,김용래,Song, J.S.,Lee, C.K.,Lee, C.C.,Yoo, C.S.,Kim, Y.R. Korean Nuclear Society 1995 Nuclear Engineering and Technology Vol.27 No.6
노심 천 이 현상의 모사계산을 위해서는 노심상태 의 초기조건을 실제노심과 일치시켜야 하는데 특히, 제논동특성이 관심의 대상이 되는 천이현상에 있어서는 직접적인 추정이 불가능한 노심내 제논분포의 초기상태가 천이현상의 해석결과에 커다란 영향을 미치게 된다 초기상태의 노심이 정확히 제논 평형상태에 있지 않는 경우 노심의 시간에 따른 변화를 잘 예측하기 위해서는 비평형 제논분포를 모사하는 초기화가 필수적이다. 본 연구에서는 천이현상 이전에 관측된 비평형 제논진동을 등가 제논진동으로 모사하여 천이현상을 보다 정확히 예측할 수 있는 제논 초기화 기법을 개발하였으며 영광 3, 4호기 시운전 시험에서 입수된 실측자료를 통하여 그 적용성을 입증 하였다. The initial condition of a core transient should be consistent with real core state for the simulation of the core tansient. The initial xenon distribution, which can not be measured in the core, has a significant effect on the transient with xenon dynamics. In the simulation of the transient starting from non-equilibrium xenon state, the accurate initialization of the non-equilibrium xenon distribution is essential for the prediction of the core transient behavior. In this study, a xenon initialization method to predict the core transient more accurately was developed through the equivalent pre-xenon-oscillation which represents the tenon oscillation before the transient and verified by the application of the simulation for a startup test of Yonggwang Unit 3.