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Recently laminated composites are widely used in civil engineering, which may suffer from delamination damage resulting from improper fabrication and overloading at service. A review of literature that exists on composite shells reveals that the research reports on delaminated shells are very few in number. Hence the present endeavor is to work on delaminated simply supported cylindrical shell with...
Single-mass freely shaking (vibrational) conveyers with a centrifugal vibration exciter transmit their load based on the jumping method. The trough is oscillated by a common unbalanced-mass driver. This vibration causes the load to move forward and upward. The moving loads jump periodically and move forward with relatively small vibration. The movement is strictly related to the vibrational parameters...
The present paper aims at establishing the validity of the constant deflection contour (CDC) method to the nonlinear analysis of plates of arbitrary shapes vibrating at large amplitude. It begins with a review of the basic ideas developed earlier by the present author. The deduction of the governing differential equations have been established. The author has made an attempt here to develop the concept...
In the present work, a methodology for predicting crack parameters (crack depth and its location) in a thin cantilever beam using vibration response has been developed. Parametric studies have been carried out using ANSYS Software to evaluate modal parameters (natural frequencies and mode shapes) for different crack parameters. From the analysis, it has been observed that both crack location and crack...
Free, out of plane vibration of a rotating non-homogeneous beam with non-linear spring mass system has been investigated. The non-linear constraint and non-homogeneity appear in the boundary condition. Solution is obtained by applying method of multiple time scale directly to the non-linear partial differential equations and the boundary conditions. The results of the linear frequencies match well...
The present article focuses on some interesting aspects of the effect of high frequency excitation on non-linear dissipative forces, like, non-linear viscous damping, coulomb dry friction damping, Elasto-Plastic dynamic friction. It is shown that non-linear viscous damping as well as friction damping characteristics can be considerably changed by the application of high-frequency excitation. A very...
A fixture assembly has been designed for vibration isolation during transportation of heavy extra long cargo by road. The fixture is supported on numbers of heavy-duty metallic wire rope isolators. These isolators are very effective for both vibration and shock isolation and specifically developed for this application. The fixture has been designed based on static, modal and random analysis by finite...
A comparative study for the prediction of amplitudes of a rotor bearing system for both localized and distributed defects in rolling element bearings has been reported in this paper. The rotor bearing system has been modeled as a multiple degree of freedom system and the excitation to the system has been assumed to be caused due to the presence of defects in inner race of the bearing. The types of...
The model of generalized Thermoelasticity as developed by Green and Nagdhi has been used in this paper to investigate the symmetric and antisymmetric mode of free oscillation of an infinite plate. The frequency equations are analysed for the case of small and large wave lengths, and the results are compared with the corresponding elastic cases.
Free, out of plane vibration of a rotating beam with non-linear spring mass system has been investigated. The non-linear constraint is connected to the beam between two points on the beam through a rigid rod. Formulation of the equation of motion is obtained starting from transverse/axial coupling through axial strain. Solution is obtained by applying method of multiple time scale directly to the...
In this work, treating the artery as a prestressed thin elastic tube with variable radius and the blood as an incompressible Newtonian fluid with variable viscosity, the propagation of nonlinear waves in such a composite medium is studied, in the long wave approximation, through the use of the reductive perturbation method and the Forced Korteweg-de Vries-Burgers (FKdVB) equation with variable coefficients...
The effect of flow-induced vibration on class I components in the reactor is a very important design factor for its qualifications worthy of loading inside the core. In this regard, a clear definition of the flow excitation and the dynamic characteristics of the component are the two primary inputs required to make an estimation of vibration severity. Though there are general guidelines available,...
Dynamic analysis of structures subjected to harmonic and seismic loads shows that the contributions of high frequency modes are essentially static. The modal responses of the structures subjected to harmonic excitation are generally combined using square root of sum of squares (SRSS) rule for well separated modes. The combination of modal response s using SRSS will results in erroneous results for...
We discuss the origin of different kinds of limit cycle oscillations. Limit cycle is a trajectory for which energy of the system would be constant over a cycle - i.e. on an average there is no loss or gain of energy. Limit cycle is an outcome of delicate energy balance due to the presence of nonlinear term in the equation of motion. In practise most systems are dissipative and we require this delicate...
Vibration transmitted to the structure during earthquake may vary in magnitude over a wide range. Design methodology should, therefore, enumerates steps so that structures are able to survive in the event of even severe ground motion. However, on account of economic reason, the strengths can be provided to the structures in such a way that the structure remains in elastic range in low to moderate...
In the present work, treating the artery as a prestressed thin-walled and long circularly cylindrical elastic tube with a mild symmetrical stenosis and the blood as an incompressible Newtonian fluid, we have studied the pro pagation of weakly nonlinear waves in such a composite medium, in the long wave approximation, by use of the reductive perturbation method. By intro ducing a set of stretched coordinates...
Synthetic rubber is an incompressible isotropic hyper-elastic material. Its mechanical property is described only by rigidity modulus at undeformed configuration which is one third of Young's modulus at the same configuration. This paper describes an indirect method to determine its rigidity modulus by measuring the frequency of oscillation of a loaded rubber string. Small superimposed oscillation...
The aim of this paper is to review the literature on the large amplitude vibration of circumferentially closed shells and to study the nonlinear forced response characteristics of noncircular cylindrical shells. The study is carried out using semi-analytical method with the meridional approximation of the displacement field as the superposition of the linear free vibration modal functions and the...
In the present work, rectangular plates with various boundary conditions are studied, which are modeled by the microstretch theory. Wave propagation problem is investigated and new waves are observed which do not appear in the classical theory of elasticity. Ritz method is used for this investigation. Triplicate Chebyshev series, multiplied by boundary functions, are used as admissible functions and...
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