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전단 및 단면 회전관성효과를 고려한 회전 외팔보의 면외 굽힘진동해석
신상하,유홍희,Shin, Sang-Ha,Yoo, Hong-Hui 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.10
A modeling method for the flapwise bending vibration of a rotating cantilever beam which has small slenderness ratio is presented in this paper. It is shown that as the slenderness ratio decreases the shear and rotary inertia effects increase. Such effects become critical for the accurate estimation of the natural frequencies and modeshapes, especially higher frequencies and modes, as the angular speed increases. It is also shown that the flapwise bending natural frequencies are higher than the chordwise bending natural frequencies. The discrepancy between first natural frequencies are especially significant when the hub radius ratio is small.
Torsion Beam Axle 현가장치 설계전용 프로그램 개발을 위한 연구
현상학(Sang-Hak Hyun),이치범(Chi-Bum Lee),최동환(Dong-Hwan Choi),신상하(Sang-Ha Shin),유홍희(Hong Hee Yoo) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Due to the low production cost and space availability which are originated from the structural simplicity of the<br/> torsion beam axle suspension, the suspension has been frequently used for sedan and SUV style vehicles. The design<br/> procedure of the suspension, however, requires significant amount of time which prohibits more efficient design of<br/> the suspension. In this paper, an integrated procedure and constituting modules are explained and the performance of<br/> the corresponding program is exhibited. The integrated procedure enables one to save the design time and cost<br/> tremendously.
하동진(Dong Jin Ha),신상하(Sang Ha Shin),유홍희(Hong Hee Yoo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Dynamic modeling of an eccentric MEMS gyroscope is presented and the dynamic characteristics of the gyroscope are investigated with the modeling method. It is found that the eccentricity of the MEMS gyroscope affects the dynamic characteristics significantly. Different from conventional MEMS gyroscopes, the zero-rate output is significantly reduced in this gyroscope. To obtain general guidelines of the gyroscope design, dimensionless parameters are first identified and the effects of the parameters on the gyroscope performance measures are investigated.
이승현(Seung Hyun Lee),신상하(Sang Ha Shin),유홍희(Hong Hee Yoo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
A modeling method for the modal analysis of a rotating composite beam is presented in this paper. Linear<br/> differential equations of motion are derived by using the assumed mode method. For the modeling, hybrid<br/> deformation variables are employed and approximated to derive the equations of motion Symmetrical<br/> laminated layers are considered for the composite beam. The effects of the dimensionless angular velocity, the<br/> hub radius and the fiber orientation angle parameter on the variations of modal characteristics are investigated