Analysis of the reasons for an aerodynamic hysteresis in flight tests of the Soyuz reentry capsule at the hypersonic segment of its descent

With the use of a mathematical model developed for describing hysteresis functions of aerodynamic forces and moments depending both on the angle of attack and on the rate of its variation, the emergence of a hysteresis in flight tests of the Soyuz reentry capsule at the hypersonic segment of its descent is found to be induced by damping.