Simulation of beating modes during the rotary-oscillating movement of complex aerodynamic engineering with determination of the conditions of their occurrence

The aim of the article is to determine conditions occurrence beating modes in a nonlinear high-order dynamic system with subsequent computer simulation these modes. Methods research oscillatory systems are applied consideration two cases interrelation on rotation (weak and strong) between circuits.
 In first them, for existence approximately same values partial frequencies longitudinal lateral oscillating motions constant increase modulus phase shift oscillations (phase motion unstable).
 At strong forces interconnection (coefficients various signs) arise at close sizes main interconnected fluctuations lying range frequencies. Such (in absence parametric interaction circuits) possible when stability biharmonic process observed.
 study complex form rotational-oscillating an aerodynamic object initial stage includes selection from complete self-oscillating contours as basis (necessary conditions) modes.
 observance single-frequency processes can also pass practice (outside resonant region frequencies) this often realized functional frequency contour components proportional parameters motion.
 All supported by numerous model experiments.