Аннотация:The cause of the vibrations of the aircraft or its parts in flight (buffeting) considered to be the effect of unsteady aerodynamic forces due to the interaction of aerodynamic wake coming off the bluff surfaces and parts of the aircraft, the caller in contact with other parts of the aircraft pressure pulsation device.
The development of such pulsations may have a different origin mechanism leading to the appearance of the surfaces of aircraft in non-stationary processes of another kind of a nonlinear near-resonance oscillation, the hallmark of which is the emergence of periodic abrupt changes in flow parameters [1]. Such fluctuations occur in the proximity of frequency external disturbances coming in the investigated area flow or caused by it in any other way, to the frequency of the possible own protection fluctuations in the area under consideration (studies show that defines the process of communication can be surprisingly non-trivial [2] and created unintentionally). A prerequisite of such oscillations in the gas flow is the possibility of propagation of disturbances up and downstream channel of this kind can act as a conductor-boundary layer at the surface of the aircraft, the conductive upstream disturbance even at supersonic flight speeds.
Literature.
1. Egorushkin S.A. Near-resonance oscillations of the gas moving in a channel of variable section // Math. USSR Academy of Sciences. Fluid Dynamics. 1984. number 4, p. 107-115. (In Russian)
2. Ganiev R.F. Nonlinear Resonances and catastrophes. Reliability, safety and quietness. -M .: Research Center "Regular and Chaotic Dynamics", 2013 (In russian)