关键词: 动稳定性, 非线性, 极限环运动

Abstract:

The angular motion of a vehicle with wrap-around fins around the static trim angle of attack is investigated using the wind tunnel free flight method. The angular motion varying with the change of Mach number presents non-linear behavior: in the subsonic state, it is stable in the balance angle of attack; in the supersonic, there exists a critical Ma cr , and it becomes a circular limit motion. At the time, the flow pattern for pitching oscillation of the wrap-around fin is revealed.

Key words: dynamic stability, non-linearity, circular limit motion