关键词: 旋转稳定弹, 角运动特性, 时变控制指令, 攻角影响因素

Abstract: To address the angle of attack response of spin-stabilized projectiles with canard layout under time-varying roll angle commands, a state-space model of the projectile is established based on the small angle of attack assumption, and the impulse response matrix is solved. In the time domain, a general analytical model of the angle of attack response is constructed using the convolution theorem; in the frequency domain, the potential resonance mechanism induced by periodic command inputs is analyzed. To clarify the influence of canard structural parameters, aerodynamic parameters, and control parameters on the angle of attack, a parameterized analytical solution for the amplitude of the angle of attack is derived. The results show that the established general analytical model can accurately calculate the angle of attack response under time-varying, fixed, and periodic roll angle commands. Increasing the deflection angle of the canard, the distance from the action point of the control force to the projectile's center of mass, or the derivative of the lift coefficient will all lead to an increase in the amplitude of the angle of attack. During flight, frequent changes in the roll angle should be avoided as far as possible, and the amplitude of the angle of attack should be limited to ensure flight stability. In addition, when the roll angle command changes continuously, it is necessary to prevent its change frequency from approaching the natural frequency of the projectile to avoid a sharp increase in the amplitude of the angle of attack. The simulation results verify the correctness of the theory, and this research supplements the studies on the angular motion characteristics of spin-stabilized projectiles with canard layout.

Key words: spin-stabilized projectile, angular motion characteristics, time-varying control command, influence factors of the angle of attack