ares i-x 30 day report - nasa · 2013. 5. 1. · ♦stage separation ... •west side wall had some...
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Ares I-X 30 Day ReportAres I-X 30 Day ReportBob Ess, Mission ManagerMarshall Smith, SE&I Chief Bob Ess, Mission ManagerMarshall Smith, SE&I Chief
December 3, 2009December 3, 2009
www.nasa.gov
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Post Flight Data Schedule
♦This is the 30day report based on initial assessment of preliminary data
♦Future reports• 60 day report Late January • 90 day report Late February
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Outline
♦Ground Systems♦Guidance, Navigation and Control♦Roll Response♦Vehicle Response♦Control System Performance♦Structural Damping♦Thrust Oscillation♦Thrust Oscillation♦Stage Separation♦Connector Assessment♦USS Splashdown♦Data Recorder♦FS Hardware Assessment
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Ground Systems (GS)
♦Completely successful Fly Away Maneuver• Designed to protect higher level structures
Mi d t d t l l l♦Minor damage was expected at lower levels• Considered acceptable • Shuttle has routinely causes some damage • Plume impingement locations were different than Shuttle that had not been• Plume impingement locations were different than Shuttle that had not been
hardened yet
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GS
♦Also experienced some damage in the flame trench to the fondue fireto the fondue fire.• West side wall had some damage
on the flame fence wall. No obvious brick damage was observed.
• East wall damage was near a suspect location identified in the pre-launch inspectionpre-launch inspection.
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GS
♦PAD designers were very satisfied with results♦This flight will help Ares I structures designers as they design for
an Ares I FAM
6Oct 5, 2009
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Guidance, Navigation and Control
♦Preliminary lift off drift analysis shows the vehicle performed as expected. • Aft Skirt location initially translates toward the FSS due to the Fly-Away• Aft Skirt location initially translates toward the FSS due to the Fly-Away
Maneuver• Aft Skirt travels a very minimal amount toward the FSS
♦Vehicle bending response was as expected♦Vehicle bending response was as expected
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Roll Torque Estimate
♦Primary Objective 5 intended to estimate roll torque• Low roll torques observed• Estimate of roll torque assessed by the Roll Control System firings• Estimate of roll torque assessed by the Roll Control System firings
− Very few firings required. Only a couple that may be related to roll torque• Simulations show that roll torque may be primarily due to aero data as
opposed to the motor( )
2800
2400
WinPlot v4.54Vacuum Thrust_Negative Torque Engine Vacuum Thrust_Positive Torque Engine
Stop roll Possible response to roll torque or aero
(lbf)
2000
1600
1200
800
400
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0 20 40 60 80 100 120 140
400
0
Time 9:59:46AM 11/16/2009Initiate CW
90 deg rollOvershootcorrection
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Vehicle Response vs Simulation
2
4
6de
g/se
c
SimulationFlight
0 20 40 60 80 100 120-2
0p, d
Time,sec
0
1
2
, deg
/sec
0 20 40 60 80 100 120-1
q
Time,sec
4
0
2
r, de
g/se
c
9
0 20 40 60 80 100 120-2
Time,sec
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Attitudes vs Simulation
20
-40
-20
0
20h
Atti
tude
, deg
SimulationFlight
0 20 40 60 80 100 120-80
-60Pitc
h
Time, sec
2
0
1
2
g A
ttitu
de, d
eg
0 20 40 60 80 100 120-2
-1
Hea
ding
Time, sec
150
200
Atti
tude
, deg
10
0 20 40 60 80 100 12050
100
Rol
l A
Time, sec
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Control System Performance
10
20
30Gain Bode - Transonic
-250
-200
-150
-100Phase Bode - Transonic
modelPitch PTIYaw PTI
modelPitch PTIYaw PTI
-10
0
10
dB
-450
-400
-350
-300
deg
Transonic
0 0.5 1 1.5 2 2.5 3-30
-20
Freq (Hz)
0 0.5 1 1.5 2 2.5 3-600
-550
-500
Freq (Hz)
25Gain Bode - Aerodynamic
-100Phase Bode - Aerodynamic
10
15
20
25
-250
-200
-150
-100modelPitch PTIYaw PTI
modelPitch PTIYaw PTI
-10
-5
0
5
dB
-400
-350
-300
degSupersonic
110 0.5 1 1.5 2 2.5 3
-25
-20
-15
Freq (Hz)
0 0.5 1 1.5 2 2.5 3-550
-500
-450
Freq (Hz)
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Structural Damping vs. Simulation
0.6
SimulationFlight
0 2
0.4
/sec
0
0.2
r, de
g/
94 96 98 100 102 104
-0.2
♦Quick look shows closed-loop 1st mode flight damping about 20% lower than simulation.
94 96 98 100 102 104Time,sec
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First Thrust Oscillation Mode
1L th t ill ti k d b t T+77 d T+79 d♦ 1L thrust oscillation peaked between T+77 and T+79 seconds
♦ Substantial margin between recommended load and actual load• Peak pressure was about 1/3 of the predicted value
F 15 H• Frequency was ~15 Hz
77 to 79 seconds
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Second Thrust Oscillation Mode
♦2L thrust oscillation peaked between T+75 and T+85 seconds♦Substantial margin between recommended load and actual load
• Peak pressure was about 1/2 of the predicted value• Frequency was ~ 29 Hz
75 to 85 seconds
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Nominal Stage Separation
♦ First Stage separation from the Upper Stage Separation was nominal • Altitude at separation ~128 kft (nominal ~ 129 kft)• Mach ~4.6 (nominal 4.6)Mach 4.6 (nominal 4.6)
♦No recontact• Review of all the onboard and chase plane video show no indications of
recontact• Initial review of debris radar does not indicate a recontact
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Forward Looking Video
P i t S ti P i t T blPrior to Separation Prior to Tumble
During Tumble Partial First Turn
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Engineering Simulation of Separation
S ti 3 SSeparation + 3 Sec
Separation + 5 Sec
Separation + 7 Sec
Separation + 9 Sec
♦Post-separation tumble of the Upper Stage Simulator was expected due to mass properties and aerodynamicmass properties and aerodynamic forces
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Connector Assessment
♦Three separation connectors on the Forward Skirt dome did not separate• Pendulum effect under the drogue chute may have caused an off center pull• Pendulum effect under the drogue chute may have caused an off center pull• A improper disconnect failure scenario was identified prior to launch and
determined not to have any significant effects to the system • No loss of functionality of the connectors
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Failed Separation Connectors
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Parachute Assessment
♦One of the main parachutes failed at initial inflation
♦1st parachute may have “dis-reefed” prematurely allowing parachute to i fl t t i klinflate too quickly• Increased initial load on
parachute and riser line systemy
• Salt Water Activation Release (SWAR) hardware exhibits damage representative of an overloadoverload
♦A second parachute then partially failed
A t d• Assessment underway
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Main Parachute Failure
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Main Parachute Failure
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Intact USS + CM/LAS prior to Splashdown
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Intact USS + CMLAS Splashdown
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Data Delivery Status
♦Recovery of data from Data Recorder in process• Completely recovered first 270 seconds of data and will be released
internally by 12/8/09internally by 12/8/09− Includes all 4 data streams and 3 video streams
• Remaining 80 seconds of data is still in work
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