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2015 ; 471
(2175
): 20140838
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On the energy partition in oscillations and waves
#MMPMID25792959
Slepyan LI
Proc Math Phys Eng Sci
2015[Mar]; 471
(2175
): 20140838
PMID25792959
show ga
A class of generally nonlinear dynamical systems is considered, for which the
Lagrangian is represented as a sum of homogeneous functions of the displacements
and their derivatives. It is shown that an energy partition as a single relation
follows directly from the Euler-Lagrange equation in its general form. The
partition is defined solely by the homogeneity orders. If the potential energy is
represented by a single homogeneous function, as well as the kinetic energy, the
partition between these energies is defined uniquely. For a steady-state solitary
wave, where the potential energy consists of two functions of different orders,
the Derrick-Pohozaev identity is involved as an additional relation to obtain the
partition. Finite discrete systems, finite continuous bodies, homogeneous and
periodic-structure waveguides are considered. The general results are illustrated
by examples of various types of oscillations and waves: linear and nonlinear,
homogeneous and forced, steady-state and transient, periodic and non-periodic,
parametric and resonant, regular and solitary.