Browsing by Author "Song, Ohseop S."
Now showing 1 - 4 of 4
Results Per Page
Sort Options
- Bending vibration of cantilevered thin-walled beams subjected to time-dependent external excitationsSong, Ohseop S.; Librescu, Liviu (Acoustical Society of America, 1995-07-01)The bending vibration of cantilevered thin-walled beams of arbitrary closed cross section exposed to time-dependent external excitations is investigated. The beam model used in this study incorporates a number of nonclassical effects, namely, transverse shear, secondary warping, anisotropy of constituent materials, and heterogeneity of the construction. An exact methodology based on the Laplace transform technique aiming at determining the frequency-response characteristics is used, and numerical illustrations emphasizing the effects of a number of geometrical and mechanical parameters on the frequency response behavior are displayed. 1995 Acoustical Society of America
- Dynamic Behavior of Elastically Tailored Rotating Blades Modeled as Pretwisted Thin-Walled Beamsand Incorporating Adaptive CapabilitiesSong, Ohseop S.; Oh, Sang-Yong; Librescu, Liviu (Hindawi, 2002-01-01)
- Implication of conservative and gyroscopic forces on vibration and stability of an elastically tailored rotating shaft modeled as a composite thin-walled beamSong, Ohseop S.; Jeong, Nam-Heui; Librescu, Liviu (Acoustical Society of America, 2001-03-01)Problems related with the implications of conservative and gyroscopic forces on vibration and the stability of a circular cylindrical shaft modeled as a thin-walled composite beam and spinning with constant angular speed about its longitudinal axis are addressed. Taking into account the directionality property of fiber reinforced composite materials, it is shown that for a shaft featuring flapwise-chordwise-bending coupling, a dramatic enhancement of both the vibrational and stability behavior can be reached. In addition, the effects played in the same context by transverse shear, rotatory inertias as well as by the various boundary conditions are discussed and pertinent conclusions are outlined.
- Modeling, vibration, and stability of elastically tailored composite thin-walled beams carrying a spinning tip rotorSong, Ohseop S.; Kwon, Hyuck-Dong; Librescu, Liviu (Acoustical Society of America, 2001-08-01)The problems of the mathematical modeling, eigenvibration, and stability of cantilevered thin-walled beams carrying a spinning rotor at its tip are investigated. The structure modeled as a thin-walled beam encompasses nonclassical features such as anisotropy, transverse shear, and secondary warping, and in this context, a special ply-angle configuration inducing a structural coupling between flapping-lagging-transverse shear is implemented. The implications of combined gyroscopic effects and conservative force upon the free vibration and stability of this structural system are revealed and a number of pertinent conclusions are outlined. Among others, it is shown that the judicious implementation of the tailoring technique can yield dramatic enhancements of both the vibrational and stability behavior of the system.