Abstract: An equivalent force method is proposed to analyze the impact point response of a dual-spin projectile with lateral control force and calculate the correction of impact point conveniently. The influence of lateral force on the mass-center motion of projectile is separated into two parts: the direct influence arose from the control force and the indirect influence caused by the variation of angular motion related to the control force and moment. Based on the seven-degrees-of-freedom rigid-body flight-dynamic-model, the change of angle-of-attack caused by the lateral control force can be derived, thus calculating the equivalent force and the variation of impact point. According to the theoretical analysis, the correction distance is almost in proportion to the length between the origin of control force and the mass center under the same condition. Simulations and experiments demonstrate that the errors of correction and phase angle calculated by the proposed method are less than 10%.

Key words: ordnance science and technology, dual-spin projectile, lateral force, correction quantity of impact point, lead phase angle