Coning motion instability of spinning missiles induced by hinge moment

Authors: Wei Zhou, Shuxing Yang, Jinlong Dong

abstract:
In the flight trials of a spinning missile, it was observed that an unexpected and unstable coning motion occurred after burnout. The missile was still in the free flight phase while the canards kept their original positions by servomechanisms. To address this unstable motion, the governing equation of the coning motion is derived and the dynamics of the fin actuators under the associated hinge moment is taken into account. The necessary and sufficient conditions of the coning motion stability are then analytically derived and further validated through nonlinear six degrees-of-freedom simulations for a representative scenario. It is demonstrated that the hinge moment may lead to the instability of spinning missiles under specific conditions. Finally, the effects of design parameters on the dynamic stability limit are discussed.

Keywords:
Coning motion
Spinning missile
Hinge moment
Stability conditions

Published in: Aerospace Science and Technology  (Volumes 30, issue 1, October 2013)

Publisher: Elsevier

ISSN Information: 1270-9638

Coning motion instability of spinning missiles induced by hinge moment

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