Unconstrained Flight And Stability Analysis Of A
Flexible Rocket Using A Detailed Finite-element
Based Procedure
Author(s)
D. J. McTavish, D. R. Greatrix & K. Davidson
Abstract
This paper presents a flight and aeroelastic stability study of a small lightweight
rocket being developed at Ryerson University for small payload delivery to high
altitudes. The emphasis is on a relatively sophisticated approach to the structural
modeling coupled to a coefficient-based aerodynamic analysis. The flexible
rocket model is derived from a standard small-motion finite-element model and
is fully unconstrained in three dimensions, supporting arbitrary translation and
rotation. The centripetal and Coriolis terms required for large body angular rates
are all included. The methodology is part of a more general effort to implement
an unconstrained flexible vehicle modeling procedure that models structures as
they are without significant restriction or fallback to degenerate structural forms
or manually produced models. The finite-element method is used for its ability to
produce accurate detailed geometrical models of structures and to exploit the
commercial software that facilitates the production of such models. In this case
study the reduced-order version of the high-detail model is chosen to address
potential rocket fin flexibility issues. The aerodynamic model of the rocket treats
the fuselage and fins as separate aerodynamic entities for which simple bodybased
theoretical and/or empirical theory can be applied. Aerodynamic
coefficients were obtained from the Missile DATCOM software package, and
built into interpolation tables to cover the speed range from subsonic to
supersonic.
Keywords: rocket flight, aeroelastic stability, flexible body dynamics.
Keywords
rocket flight, aeroelastic stability, flexible body dynamics.
Related Book
Other papers in this volume
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