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박상기,임경택,이동하,김택현,김종태 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
In this study, the mode shape of infinite fluid loaded plate is examined. The stiffeners are assumed to be equally spaced and exert only force on the Plate. The response of a fluid loaded ㄷ-type stiffened plate to a convected harmonic pressure and the far field radiation Produced by a point force excitation have been found by using Fourier transforms, a method which is particularly useful when fluid loading is included. At low and high frequencies the far field Pressure for a point excited stiffened plate is dominated by the fluid properties and the properties of the plate at the point of excitation. Mode in the far field pressure is found at the given direction of scattering frequencies, and in these frequencies the stationary phase wave frequencies are found to coincide with the free wave propagation constants for the stiffened plate. Also, the variation in the modes of the sound pressure level is increased with the increases of the bay space and in the bay area
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김인권,박상기,김택현 朝鮮大學校 機械技術硏究所 1998 機械技術硏究 Vol.1 No.1
In the case of existing in free-edge delaminations of composite laminates which are symmetry with respect to mid-plane in laminated also, in the case of asymmetry and anti-symmetry, the generalized quasi-three dimensional displacement field equations developed from quasi-three dimensional displacement field equations can be applied to solve about cases. We introduce three parameters in this paper, which have not been used in quasi-three dimensional displacement field equations until now. To the laminate subjected to the axial extension strain ε0(C1) in-direction, the bending deformation χχ(C2) around y-direction, the bending deformation ωχ(C4) around z-direction and the twisting deformation χxy(C3) around χ-direction. The generalized quasi-three dimensional displacement field equations are able to be analyzed effectively.