(Georgia Institute of Technology, 2010-12-01)
Smith, Brandon P.
This analysis considers the dynamic stability of a notional Mars 2018 entry probe
augmented with an attached supersonic inflatable aerodynamic decelerator (SIAD) deployed
at Mach 5. Dynamics of the attached isotensoid and tension cone SIAD configurations are
compared using an explicit solution to the planar equations of motion. A current
experimental database of flexible isotensoid and tension cone static aerodynamics is
employed in the simulation. Pitch-damping data from the Mars Science Laboratory (MSL)
ballistic range tests is parameterized and applied to the SIAD-augmented portion of flight.
The Mach number at which safe parachute deployment can occur depends on the amplitude
of pitch oscillation, so the sensitivity of this metric to the parameterized pitch-damping
behavior is determined. Pitch dynamics yielding unacceptable parachute staging conditions
are quantified to inform SIAD configuration selection and design. These exploratory results
are used to recommend a general strategy for measuring the pitch dynamics of SIAD augmented blunt vehicles in ground testing facilities.