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Dive into the research topics where C.A. Rossit is active.

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Featured researches published by C.A. Rossit.


Ocean Engineering | 2001

Free vibrations of a cantilever beam with a spring–mass system attached to the free end

C.A. Rossit; P.A.A. Laura

Abstract An exact solution for the title problem is obtained using the Bernoulli–Euler theory of beam vibrations. Natural frequencies are obtained for a wide range of the intervening physical parameters. The problem is of interest in naval and ocean engineering systems since in order to avoid dangerous resonance conditions the designer must be able to predict natural frequencies of the overall mechanical system: structure–motor and its elastic mounting.


Ocean Engineering | 2004

Analytical and experimental investigation on transverse vibrations of solid, circular and annular plates carrying a concentrated mass at an arbitrary position with marine applications

D.V. Bambill; S. La Malfa; C.A. Rossit; P.A.A. Laura

Abstract This investigation arose from the practical necessity of placing a centrifugal pump rigidly attached to a thin, circular cover plate of a water tank in a medium size ocean vessel. Due to lack of space, it was necessary to locate the system off—center of the circular configuration. It was considered necessary to calculate the fundamental frequency of the coupled system. The first part of the present study is concerned with the determination of the fundamental frequency of vibration of a circular plate carrying a concentrated mass at an arbitrary position, using a variational approach. Numerical results are obtained for the stated problem for several combinations of the intervening geometric and mechanical parameters. An experimental investigation is also performed in the case of clamped plates. Based on the results for solid circular plates, the fundamental frequency of annular plates with a free inner edge and a concentrated mass is also obtained. Circular plates are fundamental structural elements in ocean engineering applications: from off-shore platforms to underwater acoustic transducers. In a great variety of circumstances, they must carry operational systems in an eccentric fashion. Since the dynamic performance is always of interest, one must know at least some of the basic dynamic parameters.


Ocean Engineering | 2000

Unsteady thermoelastic analysis of a circular disk with a hot central core and subjected to adiabatic conditions

C.A. Rossit; P.A.A. Laura

Abstract The unsteady thermoelastic analysis of a cooling circular disk or cylinder which is originally at uniform temperature is a classical problem of the theory of thermal stresses. More recent studies consider the case of composite structural configurations. The present paper deals with a situation which, apparently, has not been previously considered: unsteady thermal stresses caused by the presence of a hot, central nucleus. The temperature field is obtained in terms of a Fourier–Bessel expansion and then, radial and tangential stresses are evaluated analytically. The problem is of basic interest in mechanical and naval engineering systems.


Ocean Engineering | 1997

Vibrations of a rectangular plate with a free edge in the case of discontinuously varying thickness

D.V. Bambill; R.E. Rossi; Verónica Jederlinic; C.A. Rossit

Transverse vibrations of a rectangular plate with three edges elastically restrained against rotation while the fourth is free are studied using (a) an analytical approach based on the optimized Rayleigh-Ritz method and (b) the finite element method. The study was motivated by the necessity of finding out how the lower frequencies of vibration were affected by introducing a step discontinuity in the plate thickness. This variation in the plate thickness was practiced in order to obtain a reduction in the total plate weight.


Ocean Engineering | 2002

Transverse vibrations of circular annular plates with edges elastically restrained against rotation, used in acoustic underwater transducers

S.A. Vera; Mariano Febbo; C.A. Rossit; A.E. Dolinko

Abstract Simply supported or clamped boundary conditions are rather ideal situations difficult to satisfy from a physical viewpoint. This paper considers a more “moderate” restriction: the case of edges elastically restrained against rotation for which no exact solution appears in the open literature. Eigenvalues corresponding to a wide range of the intervening geometric and mechanical parameters are determined. Good agreement is obtained with frequency coefficients determined two decades ago by means of a variational method. Obviously the problem is of basic interest in many ocean engineering applications: from the design of certain underwater acoustic transducers to pump and compressor elements passing through the design of naval vehicles and ocean structures.


Ocean Engineering | 2003

Forced vibrations of a clamped-free beam with a mass at the free end with an external periodic disturbance acting on the mass with applications in ships’ structures

D.V. Bambill; S.J. Escanes; C.A. Rossit

An exact, analytical solution is obtained for the title problem which constitutes a classical one although no solution is available in well known textbooks and handbooks normally used by the structural engineer in several fields of technology: ocean and naval engineering, aerospace applications, etc. The authors performed this study motivated by a situation where excessive displacements were noticed in a structural element carrying a relatively small motor at the free end and placed at the engine room of a naval vessel. The Bernoulli-Euler model has been employed.


Ocean Engineering | 2003

Natural frequencies of a vibrating repaired panel in an ocean structure

Daniel H. Felix; D.V. Bambill; C.A. Rossit; R.E. Rossi; P.A.A. Laura

Abstract The present work arose from the need of repairing steel plates badly damaged by corrosion in a portion of the structural element of the naval vehicle. The possibility of removing the portion and replacing it by a patch of a composite material was considered. Its dynamic behavior is altered by the introduction of the patch and the prediction of its new behavior is of great interest in many situations. This condition would appear in other real-life situations like as a localized orthotropic effect caused in the panel by a welding procedure or a metallurgical process. The first four natural frequency coefficients of the composite repaired panel with different types of boundary conditions are determined by means of a variational approach. The displacement function is approximated making use of complete sets of beam functions. The eigenvalues have been computed from (225×225) secular determinants. An independent solution is obtained using the finite element method and a reasonably good agreement with the analytical solution is encountered.


Ocean Engineering | 2002

Forced vibrations of a beam elastically restrained against rotation and carrying a spring–mass system

D.V. Bambill; C.A. Rossit

Abstract An exact solution for the title problem is obtained in closed form fashion in the case of a Bernoulli–Euler beam. It is assumed that the exciting force is applied to the mass which is elastically mounted on the beam. The mathematical model constitutes a first order approximation to a motor or engine elastically mounted on a structural element. The operation of the machine generates a transverse, sinusoidally varying force. The problem is of basic interest in mechanical, naval and ocean engineering systems from the point of view of the determination of dynamic displacements and stresses; sound radiation calculations, etc. The present problem arose in connection with the mounting of an engine on a structural beam in a small naval vessel and when excessive vibrational level was noted. This study was undertaken in order to understand the physical problem and to correct the mechanical situation


Ocean Engineering | 1987

Forced vibrations of a beam elastically restrained against rotation at the ends in the case of a concentrated load

D.V. Bambill; P.A.A. Laura; E. Romanelli; C.A. Rossit

Abstract The title problem is solved using Bernouillis classical theory and by means of the separation of variables technique. Numerical data is presented for the simply supported beam, simply supported - clamped and clamped - clamped situations for the case of a concentrated load which varies sinusoidally with time. Certainly no claim of originality is made by the authors since the problem is of a classical nature but it hoped that the rather complete tabulation of displacements, bending moments and shear forces amplitudes included in the present study will be of practical use to ocean and naval engineers.


Ocean Engineering | 1998

Thermal bending of thin, anisotropic, clamped elliptic plates

P.A.A. Laura; C.A. Rossit

Abstract The present note deals with the exact analytical solution of thermal bending of clamped, anisotropic, elliptic plates in the case where the thermal field is given by an expression of the type T ( x , y , z )= z ( Ax 2 + Cxy + By 2 ). The problem is of basic interest in some ocean and mechanical structural systems since anisotropic materials are commonly used in those fields. Obviously the case of an orthotropic material constitutes a particular situation of the problem under study.

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P.A.A. Laura

Universidad Nacional del Sur

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D.V. Bambill

Universidad Nacional del Sur

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Diana V. Bambill

National Scientific and Technical Research Council

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S. La Malfa

Universidad Nacional del Sur

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Patricio A. A. Laura

The Catholic University of America

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R.E. Rossi

Universidad Nacional del Sur

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Daniel H. Felix

Universidad Nacional del Sur

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Santiago Maiz

Universidad Nacional del Sur

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Alejandro R. Ratazzi

Universidad Nacional del Sur

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S.A. Vera

Universidad Nacional del Sur

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