Aeromaneuvering/Entry, Descent, Landing
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1 Aeromaneuvering/Entry, Descent, Landing Aeromaneuvering Case study: Mars EDL Case study: Mars Exploration Rovers Case study: Mars Science Laboratory U N I V E R S I T Y O F MARYLAND 2012 David L. Akin - All rights reserved 1
2 Aeromaneuvering Using atmospheric flight forces to affect orbit changes while minimizing propellents Aerocapture - decelerating into planetary orbit from a single pass Aerobraking - lowering apoapsis by atmospheric passes (single or multiple) Aeromaneuvering - using aerodynamic forces (e.g., li ) to perform advanced maneuvers such as plane change U N I V E R S I T Y O F MARYLAND 2
3 MARYLAND 3
4 MARYLAND 4
5 MARYLAND 5
6 Atmospheric Thermal Profiles from Justus and Braun, Atmospheric Environments for, 5th International Planetary Probes Workshop, August 2006 U N I V E R S I T Y O F MARYLAND 6
7 Atmospheric Density Profiles from Justus and Braun, Atmospheric Environments for, 5th International Planetary Probes Workshop, August 2006 U N I V E R S I T Y O F MARYLAND 7
8 MARYLAND 8
9 MARYLAND 9
10 MARYLAND 10
11 MARYLAND 11
12 MARYLAND 12
13 MARYLAND 13
14 MARYLAND 14
15 MARYLAND 15
16 MARYLAND 16
17 MARYLAND 17
18 MARYLAND 18
19 Viking Parachute Configuration Disk-Gap-Band (DGB) or bandgap parachute Deployed at Mach 2 Had to have sufficient deceleration to allow jettison of heat shield and dropping of lander from aeroshell from Cruz and Lingard, Aerodynamic Decelerators for Planetary Exploration: Past, Present, and Future, AIAA , AIAA Guidance, Navigation, and Control Conference, August 2006 U N I V E R S I T Y O F MARYLAND 19
20 Viking Chute Drag Coefficient Model from Cruz and Lingard, Aerodynamic Decelerators for Planetary Exploration: Past, Present, and Future, AIAA , AIAA Guidance, Navigation, and Control Conference, August 2006 U N I V E R S I T Y O F MARYLAND 20
21 Terminal Velocity Full form of ODE - d v 2 d h s sin v2 = 2gh s At terminal velocity, v = constant v T h s sin v2 T = 2gh s v T = s 2g sin U N I V E R S I T Y O F MARYLAND 21
22 Viking Terminal Velocity Under Chute = m c D A = 930 kg kg 0.62 = (16.15 m)2 m 2 v T = s 2g sin = s 2(3.711 m/s 2 )(7.322 kg/m 2 )sin( 30 o ) 0.02 kg/m 3 = 36.9 m sec crit = oh s sin = 0.02 kg/m3 (10, 800 m) sin ( 30 o ) = 432 kg m 2 U N I V E R S I T Y O F MARYLAND 22
23 Rigid and Inflatable Aeroshell vs. Chute U N I V E R S I T Y O F MARYLAND 23
24 MARYLAND 24
25 MARYLAND 25
26 MARYLAND 26
27 MARYLAND 27
28 MARYLAND 28
29 MARYLAND 29
30 MARYLAND 30
31 Viking Panoramas (1976) U N I V E R S I T Y O F MARYLAND 31
32 Mars Pathfinder Rover ( Sojourner ) U N I V E R S I T Y O F MARYLAND 32
33 Mars Exploration Rover U N I V E R S I T Y O F MARYLAND 33
34 Opportunity Landing Targeting U N I V E R S I T Y O F MARYLAND 34
35 Sometimes the Bounces Go Your Way... U N I V E R S I T Y O F MARYLAND 35
36 ...Opportunity Scores a Hole in One U N I V E R S I T Y O F MARYLAND 36
37 Spirit Lands in Gusev Crater U N I V E R S I T Y O F MARYLAND 37
38 Odyssey Finds its Heat Shield... U N I V E R S I T Y O F MARYLAND 38
39 Mars Phoenix Lander Touchdown U N I V E R S I T Y O F MARYLAND 39
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