Hanyang University · Engineering
Professor Hong Hee Yoo's research lab specializes in the dynamic analysis and mechanical modeling of rotating structures, with a focus on vibration characteristics, modal behavior, and structural stiffening effects in rotating plates and beams. The lab develops advanced analytical and numerical methods using dimensionless formulations and hybrid deformation variables to accurately capture motion-induced stiffness variations and boundary conditions. A key emphasis is placed on the effects of geometric and inertial parameters on eigenvalue loci veering and crossing, as well as on the dynamic response of structures with distributed or concentrated masses. The lab also extends its expertise to biomechanics, particularly in measuring the frequency-dependent viscoelastic properties of human tissues such as skin and muscle.
Figures are computed from collected data and may differ slightly.
Linearized equations of motion for the free vibration analysis of rotating cantilever plates are derived. Two inplane stretch variables are introduced and approximated to obtain the ordinary differential equations of motion. The use of the two in-plane stretch variables enables one to obtain the equations of motion, which include proper motion-induced stiffness variation terms. The equations of motion are transformed into dimensionless forms in which dimensionless parameters are identieed. The e
Abstract Linear equations of motion for the flapwise bending vibration analysis of rotating plates are derived in the present work. The equations of motion are transformed into dimensionless forms in which three dimensionless parameters are identified. The effects of the dimensionless parameters on the characteristics of the flapwise bending vibration of rotating plates are investigated. The accuracy of the present modelling method is verified through comparing its numerical results to those obt
Modal characteristics of rotating cantilever beams with a concentrated mass located in an arbitrary position are investigated in this paper. Equations of motion are derived by employing hybrid deformation variables. The resulting equations are linear but capture the stiffening effect induced by the rotational motion of the beam. For modelling of the concentrated mass, use is made of the Dirac delta function, which avoids increasing the degrees of freedom of the system. The resulting equations of
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