Hysteresis of aerodynamic characteristics and its influence on the motion parameters of axisymmetric bodies

There has been represented a problem solution of influence of hysteresis of aerodynamic characteristics on kinematic parameters of flying vehicle movement. A physico-mathematical model for numeric calculations of parameters of flying vehicle movements has been worked out. The outcome analysis gives a conclusion that presence of hysteresis in pitching moment coefficient leads to "swinging" the amplitude of oscillation of angle of attack, and also that one of the main features of hysteresis is analysis of angular accelerations diagram of rotational movement of body. "Hysteresis" curves of angular accelerations in their character differ markedly from ordinary curves. "Hysteresis" curve of angular accelerations has violent changes in small sections of movement, which do not appear in case of absence of hysteresis. This is generated by rearrangement of flow-around structure, and their appearance by well defined combinations of attack angles values and angular velocities of rotational movement of body can be explained only by presence of hysteresis in rearrangement of flow-around structure.

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