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Öğe Analysis of energy flow in thick plate structures(Pergamon-Elsevier Science Ltd, 1997) Bercin, ANAt sufficiently high frequencies: where the structural wavelength is much smaller than the thickness of the structure, the rotational inertia and transverse shear effects become increasingly important. In this study the direct-dynamic stiffness method is extended to include shear deformation and rotary inertia. The present method and the statistical energy analysis (SEA) approach are used to investigate the effects of shear distortion and rotary inertia on the flexural energy transmission of a representative stiffened plate structure. It is seen that energy flow decreases significantly when compared with the transmitted energy calculated using the classical thin plate theory. Copyright (C) 1996 Elsevier Science Ltd.Öğe Application of the dynamic stiffness technique to the in-plane vibrations of plate structures(Pergamon-Elsevier Science Ltd, 1996) Bercin, AN; Langley, RSIn this study the dynamic stiffness technique, which yields ''exact'' results for a certain class of plate structure, is extended to include in-plane vibrations. Using the equations of motion and edge tractions the stiffness matrix of each component is derived. The resulting stiffness matrices of components are then assembled to yield the dynamic stiffness matrix of a complete structure by using classical finite element techniques. The method is applied to an idealized model of a ship foundation and hull as an example. It is seen that when the in-plane modes are included, the energy level of the plates may either decrease or increase depending on the remoteness of the component to the excited plate. Copyright (C) 1996 Elsevier Science Ltd.Öğe An assessment of the effects of in-plane vibrations on the energy flow between coupled plates(Academic Press Ltd, 1996) Bercin, ANThe majority of the studies of energy transmission in plate-type structures are based on the assumption that the main component of the energy transfer is due to flexural waves, and the contribution of in-plane waves may be neglected. In this study a systematic assessment of the effects and importance of in-plane vibrations has been made by using the dynamic stiffness technique which yields ''exact'' results for a certain class of structures. The method is also used as a ''bench-mark'' to assess the predictions of the statistical energy analysis (S.E.A.) approach and the wave intensity analysis (W.I.A.) approach. It is shown that the exclusion of in-plane modes may lead to sizeable errors in energy predictions unless the structure is very simple. (C) 1996 Academic Press LimitedÖğe Free vibration solution for clamped orthotropic plates using the Kantorovich method(Academic Press Ltd, 1996) Bercin, AN…Öğe Natural frequencies of cross-ply laminated singly curved panels(Pergamon-Elsevier Science Ltd, 1996) Bercin, AN…
