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About the Hysteresis-Loop of the Mechanical Oscillators
(Universitaea "Dunărea de Jos" din Galați, 2011)
The work presents firstly the representation of the typical Hysteresis-loop
as function between the indoor forces of the oscillator as friction and
elastic forces dependant on displacement and, otherwise, as function
between ...
The Analytical Exact Solutions of Non-Linear Differential Equations Which Describe the Parametric Free Vibrations of Mechanical Systems
(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 ...
About Non-Autonomous Vibrations of Mechanical Systems
(Universitatea "Dunărea de Jos" din Galați, 2010)
Non-linear 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 non-autonomous vibrations of
mechanical ...
The Approximate Analytical Solutions for the Differential Equations which Desccribe Free Vibrations of Non-Linear Mechanical Systems
(Universitatea "Dunărea de Jos' din Galați, 2006)
The oscillation movement of a mechanical non-linear 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. ...
About the Free Parameter Vibrations of the Mechanical Systems
(Universitatea "Dunărea de Jos" din Galați, 2008)
The oscillation movement of a mechanical non-linear 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 ...
On the Use of Approximate Numerical and Analytical Methods in Order to solve the Differential Equations that Describe Vibrations of the Mechanical Systems
(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 ...
The Parametrical Free Vibrations of Elastic Systems, the Analytical Exact Solutions
(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 ...
About of the Analytical Exactly Solutions of the Differential Equations of the Non-Linear Oscillators
(Universitatea "Dunărea de Jos" din Galați, 2004)
This work presents the manner of the solving of the non-linear differential
equations from order II with the form &y& + p(t)y = q(t)y1-2a . These
equations can characterize the excited vibrations of the mechanical ...
The Approximate or Exact Analytical Solutions for the Differential Equations Which Describe Parametric Free Vibrations of Mechanical Systems
(Universitatea "Dunărea de Jos" din Galați, 2013-05-01)
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 ...
Mathematical Model for Frequency-Dependent soil Propagation Analysis
(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 site-specific, measurable, frequency ...