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김정주,전정일,변용규,노광춘,정정주,전태건,Kim, Chung-Joo,Chun, Jeong-Il,Byun, Yong-Kyu,Ro, Kwang-Choon,Chung, Chung-Choo,Jeong, Tae-Gun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.11
As track density needs to increase to the order of 10, 000 tpi, the suspension has become a critical component in hard disk drives. One of the main obstacles to attain high track density is the structural resonances of the suspension in lateral direction. We investigate the suspension dynamics through the experimental modal analysis and the finite element method. An LDV (Laser Doppler Vibrometer) is employed to measure the response of the suspension which is excited by a shaker and an inpulse hammer for the free condition and the loaded condition, respectively. After comparing the experimental and numerical results, we study how the initial geometry of the bend region affects the suspension dynamics. It is found that the natural frequency of the sway mode decreases as the bend ratio and the bend angle increase. The shape of torsional mode changes as the mass of a slider increases, resulting in a local decrease in the natural frequency.
노광춘,이규섭,박영필 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.1
Subharmonic vibration of order 1/2 of a simply supported uniform beam subjected to initial tention is studied for a concentrated lateral harmonic excitation force. Theoretical analysis is carried out by assumming the deflection as a superposition of linear eigenfunctions. Harmonic balance method is used for the steady state solution. The steady state solutions are obtained by using Newton-Raphson method. Experiments are carried out and show good agreement with the theoretical results.
댐퍼붙이 거위목바이트를 使用하는 切削系의 動的 安定性에 關한 硏究
李炯植,鄭準基,盧光春 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2
The effect of the damped goose-neck tool upon the dynamic stability of machine tool was investigated. The dynamic stability of machine tool is directly related to the chatter in the metal cutting process. By the test of the dynamic characteristics for the damped goose-neck tool, theoretical approach of dynamic stability of machine tool is identified. It's results are compared with the results of actual cutting test. And the dynamic stability of machine tool is improved by the higher elasticity and the increase of damping coefficient for the damped goose-neck tool.
박영필,노광춘,홍성해 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.2
This paper is concerned with the lateral dynamic stability of a flexible missile with discontinuities. The missible is idealized as a free-free beam with geometrical and material discontinuities subjected to a follower force with directional control. Using the unconstrained variational principle, finite element method is applied to the Euler beam equation to obtain the eigen-matrix eqn. The behaviors of the eigenvalues at various thrusts and the effects of missile are analyzed.