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Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/668

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contributor.authorMohanta, Laxmi-
contributor.authorMohanty, S C-
identifier.citationDynamic Stability of a Sandwich Beam Subjected to Parametric Excitation, Thesis submitted in partial fulfillment of the requirements for the degree of Master of Technology (Research) in Mechanical Engineeringen
descriptionCopyright for the thesis belongs to National Institute Technology of Roureklaen
description.abstractVibration control of machines and structures incorporating viscoelastic materials in suitable arrangement is an important aspect of investigation. The use of viscoelastic layers constrained between elastic layers is known to be effective for damping of flexural vibrations of structures over a wide range of frequencies. The energy dissipated in these arrangements is due to shear deformation in the viscoelastic layers, which occurs due to flexural vibration of the structures. Multilayered cantilever sandwich beam like structures can be used in aircrafts and other applications such as robot arms for effective vibration control. These members may experience parametric instability when subjected to time dependant forces. The theory of dynamic stability of elastic systems deals with the study of vibrations induced by pulsating loads that are parametric with respect to certain forms of deformation The purpose of the present work is to investigate the dynamic stability of a three layered symmetric sandwich beam subjected to an end periodic axial force . Equations of motion are derived using finite element method. The regions of instability for simple and combination resonances are established using modified Hsu’s method proposed by Saito and Otomi[76]. It is observed that with increase in core thickness parameter fundamental buckling load increases. The fundamental resonant frequency and second mode frequency parameter also increase with increase in core thickness parameter. Fundamental loss factor and second mode loss factor also increase with increase in core thickness parameter.Increase in core thickness parameter enhances the stability of the beam. With increase in core loss factor also the stability of the beam enhances. There is a very good agreement of the experimental results with the theoretical findings.en
format.extent606856 bytes-
publisherNational Institute of Technology, Rourkelaen
titleDynamic Stability of a Sandwich Beam Subjected to Parametric Excitationen
Appears in Collections:Thesis (MTech by Research)

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