Abstract: On the basis of multi-body characteristics of dual-spin rocket, a dynamics model, including motions of nose and afterbody is established by Kane method. Considering the interaction of the nose and the afterbody, the axial constraint forces between the nose and the afterbody is treated as active force rather than ideal constraint. Finally, seven scalar dynamic equations can be obtained. Theoretical analysis and simulation results show that the Kane model can present the flight characteristics of dual-spin rocket as accurately as the Newton Euler model. At the same time, the Kane model also can reduce the number of differential equations and has some applicability.

Key words: ordnance science and technology, rocket, multi-body system, dual-spin projectile, Kane method, dynamics model