Browsing by Author "184a4ac24b0f45a0a0767739ce7d7917"
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About NonAutonomous Vibrations of Mechanical Systems
Cauteș, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2010)Nonlinear vibrations of mechanical systems are described by differential equations of the second order, which are generally written .. . x f ( x, x,t ) 0 . In this work we study nonautonomous vibrations of mechanical ... 
About of the Analytical Exactly Solutions of the Differential Equations of the NonLinear Oscillators
Cauteș, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2004)This work presents the manner of the solving of the nonlinear differential equations from order II with the form &y& + p(t)y = q(t)y12a . These equations can characterize the excited vibrations of the mechanical ... 
About the Free Parameter Vibrations of the Mechanical Systems
Cauteș, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2008)The oscillation movement of a mechanical nonlinear system is not easy to solve exactly in an analytical way. The approximate solutions are based on different methods and give different values with different approximation ... 
About the HysteresisLoop of the Mechanical Oscillators
Cauteș, Gheorghe (Universitaea "Dunărea de Jos" din Galați, 2011)The work presents firstly the representation of the typical Hysteresisloop as function between the indoor forces of the oscillator as friction and elastic forces dependant on displacement and, otherwise, as function between ... 
About the Vibrations of the Mechanical Systems with NonLinear Damping
Cauteș, Gheorghe (Universitatea "Dunarea de Jos" din Galați, 2009)This work will analyze the nonlinear vibrations of the mechanical systems, actually the ones with nonlinear damping. If we consider damping F( x,x ) x( k k x );k1,k2 R 2 = − 1 − 2 Î & & & then the differential ... 
Mathematical Model for FrequencyDependent soil Propagation Analysis
Cauteș, Gheorghe; Năstac, Silviu (Universitatea "Dunărea de Jos" din Galați, 2002)Vibration analyses of advanced technology facilities typically must consider frequency as well as amplitude of vibration. A soil propagation model is proposed which will allow the use of sitespecific, measurable, frequency ... 
On the Use of Approximate Numerical and Analytical Methods in Order to solve the Differential Equations that Describe Vibrations of the Mechanical Systems
Cauteș, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2012)The paper makes a comparative study on the approximation errors of the solutions of the differential equations of second order using different numerical methods, a study which is assessed by the necessity of numerical solving ... 
Periodic Solutions of Some Differential Equations that Show the NonLinear Vibrations of the Mechanical Systems
Cauteș, Gheorghe (Universitatea "Dunarea de Jos" din Galați, 2009)Many phenomenons of mechanical nature possess nonlinear vibrations, their mathematical forming operation leading to differential equations or to systems of differential nonlinear equations. In this work it is shown ... 
Phisycal and Mathematical Model Forvibratory Driving Process Analysis
Cauteș, Gheorghe; Năstac, Silviu (Universitatea "Dunărea de jos" din Galați, 2002)Vibratory driving of pile is one of the technologies used for powerless basement soil deep consolidation. This process consist by favouring the pile penetration in soil, whereupon when vibrations using. Experimentally, was ... 
The Analytical Exact Solutions of NonLinear Differential Equations Which Describe the Parametric Free Vibrations of Mechanical Systems
Cauteș, Gheorghe (Universitatea "Dunărea de Jos' din Galați, 2010)The movements of many material systems can be described by differential equations that have coefficients that depend on time. It is difficult to determine the solutions of these equations. Although many concrete problems ... 
The Approximate Analytical Solutions for the Differential Equations which Desccribe Free Vibrations of NonLinear Mechanical Systems
Cauteș, Gheorghe; Oproescu, Gheorghe (Universitatea "Dunărea de Jos' din Galați, 2006)The oscillation movement of a mechanical nonlinear system is not easy to solve exactly on analytical way. The approximate solutions are based on different methods and give different values with different approximation degree. ... 
The Approximate or Exact Analytical Solutions for the Differential Equations Which Describe Parametric Free Vibrations of Mechanical Systems
Cauteș, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 20130501)The vibrations of many mechanical systems can be described by differential equations that have coefficients that depend on time. It is difficult to determine the approximate or exact analitical solutions of these equations. In ... 
The Parametrical Free Vibrations of Elastic Systems, the Analytical Exact Solutions
Cauteș, Gheorghe (Universitatea "Dunărea de Jos" din Galați, 2012)The movements of many material systems can be described by differential equations that have coefficients that depend on time. It is difficult to determine the solutions of these equations. Although many concrete problems ...