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AAE 450 - Senior Design

AAE 450 - Senior Design. Nicholas Saadah Group A - Aerodynamics Presentation #1 1/16/01. School of Aeronautics and Astronautics. Goals of Study. To determine method of direct entry where options are: Ballistic capsule vs. lifting body Aerocapture vs. Aeroentry. Constraints are:

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AAE 450 - Senior Design

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  1. AAE 450 - Senior Design Nicholas Saadah Group A - Aerodynamics Presentation #1 1/16/01 School of Aeronautics and Astronautics

  2. Goals of Study • To determine method of direct entry where options are: • Ballistic capsule vs. lifting body • Aerocapture vs. Aeroentry • Constraints are: • Maximum acceleration on crew • Minimum velocity low enough for parachute deployment School of Aeronautics and Astronautics

  3. The code • MATLAB code uses standard numerical integration (contained in code, not ‘ode45’) to propagate orbit around Mars • Computes gravity and drag • Assumptions: • Spacecraft is flat plate (m = 5557kg, area = 11.95 m2) Apollo CM numbers • Spacecraft bottom is always perpendicular to velocity (cd=2) • Atmospheric density = .01*(earth atm. density) via curve fit • dt = 1 second School of Aeronautics and Astronautics

  4. Conclusions • Straight-line descent not an option (acceleration too high) • Aerocapture to elliptic orbit a possibility • Aeroentry a possibility • Team now has a (presumably) working code to analyze atmospheric trajectories School of Aeronautics and Astronautics

  5. Skills • Four co-op tours with Trajectory Office at NASA - Johnson Space Center • Well versed in MATLAB, QUICK, FORTRAN 77, UNIX,C • AAE 532 (Orbital Mechanics), AAE 412 (Intro to CFD), AAE 507 (Principles of Mechanics) School of Aeronautics and Astronautics

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