“…in periodically kicked hard oscillators, ice-structure interaction models, kicked rotators, driven impact oscillators, cyclotron accelerators of charged particles or phenomena of grouping and phase selection of particles, some processes of interaction between electromagnetic waves and particle ensembles in the ionosphere and magnetosphere of the earth, phenomena of generating powerful LF waves in the near space given a cosmic electromagnetic background, "mega-quantum" resonance structure of the solar system, etc. (Isomfiki et al, 1985;Isomfiki, 1990;Tung, 1992;Soliman and Thompson, 1992;Troesch et al, 1992;Damgov and Douboshinsky, 1992;Cecchi et al, 1993). This paper deals with the common features in the behavior of pendulum with invariable parameters in new conditions, namely, the pendulum is affected by continuous periodical external constrained force which is inhomogeneous with respect to the coordinates of motion.…”