Eigenfrequencies habit of aeroelastic aircraft inside domain of dynamic stability

Аuthors

Georgiev A. F.

Bauman Moscow State Technical University, MSTU, 5, bldg. 1, 2-nd Baumanskaya str., Moscow, 105005, Russia

e-mail: alexandrfg@rambler.ru

Abstract

An oscillation of controlled rocket inside airflow in this article is considered. From a control system side there are some requirements to eigenfrequencies and mode shapes of aeroelastic model of rocket. To satisfy requirements the frequencies values can be changed by variations of mass and stiffness properties of rocket. To change the eigenfrequencies of rocket model a classical approach is used: an increasing of stiffness brings to increasing of eigenfrequencies and increasing of mass brings to decreasing of eigenfrequencies. In this article is showed that if oscillation of rocket inside airflow is considered then classical approach is failure. This effect appears inside domain of aeroelastic stability at normal flight conditions.

Keywords:

aircraft, rocket, aeroelasticity, eigenfrequencies, domain of dynamic stability