考虑附加力影响的弹性体远程火箭弹弹道分析

Long-range rockets have the characteristics of large slenderness ratio and long range. To improve the accuracy of trajectory simulation, it is necessary to consider aeroelasticity and subsidiary load effect. Based on the nonlinear motion equation of the rockets, the effect of aeroelasticity is is incorporated in the trajectory simulations. The unsteady aerodynamic loads of the body, wings and rudders are calculated by slender body theory and aerodynamic derivative method, respectively. Besides, the six-degree-of-freedom flight dynamics model considering the curvature and the subsidiary loads generated by Earth rotation and fuel mass change is built. Then, the effect of aeroelasticity, subsidiary loads and structural stiffness on rocket miss distance is analyzed through the trajectory simulations. Simulation results show that aeroelasticity and subsidiary loads have a great impact on the miss distance of the rocket. In addition, the subsidiary loads are highly coupled with aeroelasticity and the effect of the subsidiary loads on miss distance of the rocket is significantly amplified with the consideration of aeroelasticity effect. Thus, it is necessary to consider the coupling effect of aeroelasticity and subsidiary loads simultaneously in whole trajectory simulation analysis. Furthermore, when the rocket structural stiffness becomes insufficient, the miss distance of the rocket increases greatly. Therefore, sufficient structural stiffness is essential for improving the hit precision in rocket preliminary design.