Transcript SDO Systems Retreat - Massachusetts Institute of Technology

LRO/CRaTER
Technical Interchange Meeting
LRO Mechanical Systems
Giulio Rosanova / 543
301-286-5907 / [email protected]
NASA’s Goddard Space Flight Center
2005/4/14
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LRO Baseline (Deployed 0n Orbit)
High Gain
Antenna
IM Optical
Bench /Radiator
Avionics
Module
Propulsion
Module
X (Thrust)
Solar Array
Y
Z (NADIR)
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
2
LRO Baseline (Deployed on Orbit)
Optical Bench / Radiator
Instrument
Module
Solar Array
Avionics
Module
Propulsion
Module
High Gain
Antenna
X (Thrust)
Z (NADIR)
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
Y
3
LRO Baseline (Stowed)
High Gain
Antenna
Instrument
Module
Avionics
Module
Propulsion
Module
Solar
Array
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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LRO Nomenclature
ORBITER
SPACECRAFT
INSTRUMENTS
CRaTER
Diviner
SPACECRAFT BUS
LAMP
PROPULSION
MODULE
AVIONICS
MODULE
INSTRUMENT
MODULE
Propulsion
Electrical
Mechanical
Thermal
Electrical
Mechanical
Thermal
Electrical
Mechanical
Thermal
SOLAR ARRAY
SYSTEM
Solar Cells
Substrate
Deployables
Gimbals
HIGH GAIN
LEND
ANTENNA SYST
LOLA
HGA Dish
LROC
Deployables
Gimbals
Boom
Boom
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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LRO Coordinate System Definition
Coordinate Axis Origin
Located at center of L/V
Separation Plane
ZENITH
(-Z)
RHR
(+Y)
THRUST
DIRECTION
(+X)
NADIR
(+Z)
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
Velocity Vector
+/- X axis
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Mechanical Baseline Design
82 in.
79 in.
(2.1 m)
(2.0 m)
110 in.
(2.8 m)
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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LRO Launch Vehicle Interface
DELTA-II 3-Stage
9.5 ft. P/L Envelope
100” DIA.
(2.54m)
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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Mechanical System Requirements
•
Mechanically Accommodate LRO Instrument Suite
• Provide Mechanically Stable Instrument Bench for Pointing Requirements
• Meet Instrument FOV Requirements
• Provide Thermal Radiator Area for Instruments
• Provide Orbiter Purge System for Instruments
•
Compatibility with DELTA-II Class Launch Vehicle
• Instruments shall comply with “LRO Structural Loads and Mechanical
Environments Specification” (430-SPEC-000022)
• Fairing Doors for Instrument Access on Launch Pad
• T-0 Purge Available
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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Mechanical System Requirements
•
Comply with LRO Alignment, Pointing Jitter Budget
• Instrument Pointing/Alignment Errors
• Thermal Distortion after Off-Pointing and/or Eclipse, G-Sag
• High Frequency Jitter
– Deployed Structures First deployed Frequency: ≥1 Hz
•
Verify all Mechanical / Structural Designs and Functionality
• Qualification by Test
•
Use Simulators to Verify Interfaces
• Provide Orbiter Wiring Mock-Up
• Instrumenters to provide Hi-Fi Mass simulators for complex Designs
– Used for LRO Orbiter Structural Qualification Testing
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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LRO Instruments
INSTRUMENT
MASS
FOV(R)
CRaTER
5.60 kg
60º Full Angle
Nadir & Zenith
Diviner
9.98 kg
160º Full Angle
Nadir Centered
LAMP
5.00 kg
40º Full Angle
Nadir Centered
LEND
23.20 kg
20º Full Angle
Nadir Centered (4)
LOLA
10.60 kg
<<1º
Nadir Centered (2)
LROC
14.40 kg
NAC (2)- 60º Full Angle
WAC- 120º ct X 30º dt
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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LRO Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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CRaTER Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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CRaTER Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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CRaTER Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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CRaTER 30ºZ-80ºN Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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CRaTER 30ºZ-80ºN Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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CRaTER 30ºZ-80ºN Fields of View
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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Instrument Design Requirements
• Design Limit Load: 12 g’s any axis
• Minimum Factors of Safety
Type of Hardware
Tested Flight Structure – metallic
Tested Flight Structure – beryllium
Tested Flight Structure – composite*
Pressure Loaded Structure
Pressure Lines and Fittings
Untested Flight Structure – metallic only
Ground Support Equipment
Transportation Dolly/Shipping Container
Design Factor of Safety
Yield
Ultimate
1.25
1.4
1.4
1.6
N/A
1.5
1.25
1.5
1.25
4.0
2.0
2.6
3.0
5.0
2.0
3.0
• Minimum Frequency Requirement: 35 Hz (50 Hz Recommended)
• Overall acoustic environment: 149.6 dB qual, 146.6 dB acceptance
• Random Vibration Environment for Instruments and Components
Frequency (Hz)
20
50
800
2000
Over All
NASA’s Goddard Space Flight Center
2005/4/14
Protoflight/Qual Level
0.026 g2/Hz
0.160 g2/Hz
0.160 g2/Hz
0.026 g2/Hz
14.1 grms
Acceptance Level
0.013 g2/Hz
0.080 g2/Hz
0.080 g2/Hz
0.013 g2/Hz
10.0 grms
Mechanical Systems Giulio Rosanova/543
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LRO FEM: Configuration F
**Total Mass: 2490 lbm (1129 kg)
**CG (Origin at center of clampband IF)
X
Y
43.246
1.0984
Z
0.716
0.0182
0.570 in
0.0145 m
**Mass Moments of Inertia
Inertias about I/F (lbm*in2)
Inertias about I/F (kg*m 2)
Ixx
951379.60 Ixy 120558.70 Ixx
278.413 Ixy
35.281
Iyy 6625327.00 Iyz
1614.27 Iyy
1938.847 Iyz
0.472
Izz 6650097.00 Izx 159823.80 Izz
1946.096 Izx
46.771
Inertias about C.G. (lbm*in2)
Inertias about C.G. (kg*m 2)
Ixx
949295.00 Ixy
43445.97 Ixx
277.803 Ixy
12.714
Iyy 1968112.00 Iyz
598.73 Iyy
575.952 Iyz
0.175
Izz 1992413.00 Izx
98500.76 Izz
583.063 Izx
28.825
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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Fundamental Mode: Lateral Direction
**Mass scaled to launch vehicle capability (1480 kg)
fn = 19.6 Hz
NASA’s Goddard Space Flight Center
2005/4/14
fn = 19.9 Hz
Mechanical Systems Giulio Rosanova/543
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Fundamental Mode: IM
fn = 46 Hz
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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Mechanical Topics for TIM
– CAD Models: (PRO-Engineer), (SOLID-WORKS), (IDEAS)
– Identify CRaTER Orientation wrt LRO Coordinate System
– Identify Access zones to support testing do you Require?
• (i.e., sources required for calibration, etc)
– Identify Connector Locations and Access/Stay-Out Zones Required?
– Identify Optical Reference Surfaces (as required)?
• Alignment cube/reference mirror surfaces: size, and location?
– Identify GSE Handling Points
– Will Aperture Doors or Shutter be Considered?
– FEA Models: (FEMAP), (NASTRAN)
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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Mechanical Topics for TIM
– Identify your Design Heritage? (have some MLA info)
• What were the design limit loads?
• What factors of safety were used?
• What was the random vibration environment?
• What was the instrument’s first frequency ?
• What Analysis Documentation Exists?
• What Verification Test Reports Exist?
• Is the instrument sensitive to shock or acoustics?
– Do you require Access while on the Launch Pad?
– Do you require T-0 Purge at Launch?
– Mechanical Mass Simulator Required
• Simple Designs over 50 Hertz (i.e. LAMP, CRaTER) mass and CG only.
– Mass Simulator must be Qualified before Orbiter Structural Testing.
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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LRO Mechanical System
Development Flow
MECHANICAL
Design & Analysis
INSTRUMENT
MASS SIMS.
PROP. Module
(PTyp) Build
12/06
S/C Bus
(PFlt) Build
12/06
9/06
4/06
Inst. Module
(PFlt) Build
CDR
Mechanical
System Assy.
Functional
1/07
Mechanical
Qualification
Testing
Deployables
(PFlt)
Build & Test
INSTRUMENTS
7/07
MECHANICAL
Fabrication
10/07
9/06
PROP. Module
(FLT)
Build & Proof
10/06
PM
Pluming
Assy.
4/07
Spacecraft
I&T
10/07
Orbiter
I&T
2/08
1/07
LRO S/C
Subsystems /
Components
Orbiter
Environmental
Testing
7/08
Launch
Activities
LRD 10/08
NASA’s Goddard Space Flight Center
2005/4/14
Mechanical Systems Giulio Rosanova/543
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