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Stability of a Rotating Disk in an Enclosed Compressible Fluid
강남철(Namcheol Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
The stability of a thin, flexible annular disk rotating in an enclosed compressible fluid is investigated. The discretization procedure utilizes Green's theorem and exposes two distinct gyroscopic effects explaining the coupled system dynamics: One describes the gyroscopic coupling between the disk and acoustic oscillations, and the other arises from the disk rotation. For the undamped system, coupled structure-acoustic traveling waves can destabilize through mode coalescence leading to flutter instability. A detailed investigation of the effects of dissipation arising from acoustic and disk damping predicts instability mechanisms for this system.
배종진(Bae Jongjin),강남철(Kang Namcheol) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
It is well known that the stiff plantar soft tissue is one of causes of a diabetic foot ulcer. Therefore, understanding the stiffness of plantar soft tissue plays an important role in preventing from a foot ulcer. To measure the stiffness of the plantar soft tissue, a device composed of a loadcell and micrometer is designed. Using the device, reaction forces are measured when deformations by a slender probe are applied, and further the stiffness of the plantar soft tissue was extracted. The experimental results show that the stiffness of the plantar skin has big differences depending on the locations of human foot. In addition, we found that the reaction forces generated by plantar skin vary with time and have a tendency to converge on a certain value.