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Showing 1 to 20 of 20 for “"Free Vibrations"”.
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Free vibrations of inflatable dams
This work deals with the linear two-dimensional free vibrations of an inflated cylindrical membrane. An air-inflated membrane is considered first. Vibration frequencies and modes are determined for various cases. The lowest mode shape is anti-symmetric. In the rest of the work, the membrane is …
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Free vibrations of a vierendeel girder
As a suggestion for further work in deriving the equations by the Principle of Virtual Displacements, it might be advisable to write the equations based on the vertical displacements of the points of inflection of each column. The concentrated mass of each panel would be located at the center of …
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Free Vibrations and Static Deformations of Composite Laminates and Sandwich Plates using Ritz Method
… been employed to analyze the following problems: free vibrations of plates with curvilinear stiffeners, the lowest 100 frequencies of thick isotropic plates, free vibrations of thick quadrilateral laminates and free vibrations and static deformations of rectangular laminates, and sandwich …
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ΑΝΤΙΠΛΗΓΜΑΤΙΚΗ ΠΡΟΣΤΑΣΙΑ ΤΩΝ ΑΡΔΕΥΤΙΚΩΝ ΔΙΚΤΥΩΝ
… IN PIPING NETWORKS. IN ADDITION THE METHOD OF FREE VIBRATIONS IN PRESSURIZED SYSTEMS IS USED IN ORDER TO DETERMINE THE OPTIMUM INSTALLATION POSITION OF THE PRESSURE RELIEF VALUE.
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Free Vibration of Bi-directional Functionally Graded Material Circular Beams using Shear Deformation Theory employing Logarithmic Function of Radius
… and wind turbine blades. The analysis of free vibrations of curved structures plays a critical role in their design to avoid transient loads with dominant frequencies close to their natural frequencies. One way to increase their areas of applications and possibly make them lighter without …
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Equilíbrio e vibrações induzidas por vórtices de "risers" de perfuração
… drilling parameters. Then, a brief study about free vibrations is presented. Finally, the analysis of transverse vibrations induced by vortex-shedding is dane. These vibrations can occur in places of strong marine currents. The mathematical model was postulated by Skop and Griffin and its …
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Uma formulação de elementos de contorno para análise de vibrações livres
… formulation for the boundary element analysis of free vibrations of elastic bodies in plane stress or plane strain. The main characteristic of this method is the transformation of the inertial domain integral into equivalent boundary integrals, by employing special interpolation functions to …
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Resposta dinâmica e estabilidade de tubos com escoamento interno
… linear and non-linear transient response and free vibrations problems and dynamic stability of pipes conveying fluid. Making use of an updated lagrangian formulation for the principle of virtual work the incremental equations of motion are deduced. These equations are linearized about the …
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Stress analysis of parabolic arches and their dynamic behavior
… dynamic part, special attention is given to the free vibration of such arches. The following procedure is followed. The loading conditions are assumed and a infinitesimal segment of the arch is taken so as the differential equations relating deflections and slope changes on both ends of the …
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Three-Dimensional Nonlinear Dynamics of a Moored Cylinder to be Used as a Breakwater
… and compressionless springs. All six degrees of freedom of the structure are considered. The breakwater is modeled in air with a net buoyant force acting through the cylinder's center of gravity. The six "dry" natural frequencies of the structure are computed. Both linear and nonlinear free …
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Three-Dimensional Analysis of Moored Cylinders Used as Breakwaters
… The breakwater is completely submerged below the free surface and is attached to the ocean floor with six symmetrically configured mooring lines. The cylinder is filled with air and the mooring lines remain taut during the structure's motion. Six degrees of freedom describe the motion of the …
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The effect of cracks on the dynamic behavior of bars and shafts
… vibration of a cracked bar and the coupled vibrations of a cracked rotating shaft. In the longitudinal vibration study, the equation of motion is developed for a cantilevered bar with a symmetric surface crack. Next, Galerkin's Method is used to obtain one- and two-term approximate …
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Elastic constants from molecular mechanics simulations of frequencies of free-free single-walled carbon nanotubes and clamped single-layer graphene sheets
… sheets (SLGSs) are determined by studying their free vibration characteristics using molecular mechanics (MM) simulations with the MM3 potential and finding their equivalent continuum structures (ECSs). The computational framework has been validated by comparing the presently computed basal plane …
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Nonlinear vibration and chaotic motion of uniform and non-uniform carbon nanotube resonators.
… vibration of CNTs are focused on the linear and free vibrations and also, CNTs are supported by linear foundations. The main goal of this research is to develop nonlinear vibration analysis of CNTs having geometrical nonlinearity and being rested on nonlinear Winkler and Pasternak foundations. …
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Modal interactions in the dynamic response of isotropic and composite plates
… solutions are obtained for the problem of linear free vibrations and linear stability of shear-deformable cross-ply laminated plates. The governing equations are transformed into a set of first-order linear ordinary-differential equations with constant coefficients. The general solution of these …
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Optimum First Failure Loads of Sandwich Plates/Shells and Vibrations of Incompressible Material Plates
… sheet. In this work we have numerically analyzed free vibrations of plates made of a linearly elastic incompressible rubber-like material (Poison's ratio = 0.5) by using a TSNDT for incompressible materials and the mixed FEM. The displacements at nodes of a 9-noded quadrilateral element and the …
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Simultaneous Energy Harvesting and Vibration Control via Piezoelectric Materials
… is able to harvest energy from the ambient vibrations along with available sunlight during normal flight. If the wing experiences any strong wind gust, it will sense the increased vibration levels and provide vibration control to maintain its stability. This work holds promise for improving …
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On the behavior of viscoelastic plates in bending
… of correspondence. This is used to study free vibrations of rectangular viscoelastic plates simply supported on all edges. Solutions of the simplified form of the fundamental equation for the case of so-called proportional loading, I.e. when the load function is the product of a space …
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Aplicación de Métodos Meshless al Análisis de Problemas de Autovalores
… entre ellos, deduciéndose que el método Element-Free Galerkin Method [Método Galerkin Sin Elementos] (EFGM) es representativo de un amplio grupo de los mismos. Por ello se ha empleado como referencia en este análisis. Muchas de las fuentes de error de un método sin malla provienen de su algoritmo …
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On the application of numerical continuation to large-scale dynamical systems
… The numerical results corresponding to the free vibrations are compared to a perturbation analysis obtained using the multiple-scales method to show the validity of the numerical scheme. The developed numerical technique is then employed to investigate the geometry as well as parameter …