Vs. Burd, ALMOST-PERIODIC RESONANCE OSCILLATIONS IN NONLINEAR 2-DIMENSIONAL SYSTEMS WITH SLOWLY VARYING PARAMETERS, Journal of applied mathematics and mechanics, 60(3), 1996, pp. 391-398
Almost periodically perturbed two-dimensional systems with rapidly cha
nging phase and slowly varying coefficients are considered. The condit
ions for the existence and stability of almost-periodic resonance solu
tions are investigated. Forced oscillations of a mathematical pendulum
acted upon by the sum of two small periodic forces with close frequen
cies are considered as an example. Copyright (C) 1996 Elsevier Science
Ltd.