ENAE
484 - Spring 2004
Level 1 Requirements Document
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| Space Systems Laboratory | University
of Maryland |
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ENAE
484 - Spring 2004
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These are the externally-specified requirements for your system to meet. Be aware that, if you can demonstrate that one or more of these requirements are detrimentally driving your design, you can request relief from those specific requirements. Although the requirements are organized based on the group it affects the most, all team members are bound by all requirements.
These are what are known in the business as the "Level 1" requirements - they're the top-level requirements that drive the program. Based on these and your analyses, you should be deriving increasingly more detailed sets of requirements, focusing down on your specialties and specific tasks.
We reserve the right to add requirements! Ideally, all of the Level 1 requirements would be "cast in stone" at the beginning of the program, but I can't think of a single instance (in this class or in the "real world") where that really happened...
| Requirement # | Requirement | Posted |
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MORPHLAB shall be designed for a nominal mission increment consisting of a human mission of three sols duration, followed by a noncrewed teardown, transit, and setup of three sols duration. In defining a program plan, early increments may deviate from these time requirements. |
1/30/04 |
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MORPHLAB shall be designed to break down from the inhabited base design, translate 1000 km, and reestablish a base ready for human habitation in three sols. | 1/30/04 |
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MORPHLAB shall provide the capability to accomplish selected scientific investigations during the transit phase. This includes the capability to collect local rock and soil samples upon direction. | 1/30/04 |
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MORPHLAB shall provide necessary equipment to enable extended human science investigations within a radius of 10 km from the base location. | 1/30/04 |
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All nominal human movement between MORPHLAB modules shall be accomplished in shirt-sleeve conditions. Transfer between MORPHLAB and the crew transport module may be assumed to require EVA. | 1/30/04 |
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The MORPHLAB program will perform a scientifically supportable series of 10 human missions to the moon during the period of 2015-2020 | 1/30/04 |
| Requirement # | Requirement | Posted |
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The MORPHLAB system shall be designed to operate on the lunar surface. No feature of the design shall preclude its adaptation for use on the Martian surface. | 1/30/04 |
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The initial configuration of MORPHLAB shall be established on the lunar surface ready to support a human mission no later than the end of 2015. | 1/30/04 |
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MORPHLAB shall be designed such that it can accommodate the failure or loss of a single module at any time without significant disruption of nominal activities. | 1/30/04 |
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Following the loss or failure of any two modules during an inhabited mission phase, MORPHLAB shall support the crew for a worst-case interval until a lunar launch window occurs. | 1/30/04 |
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Systems design shall be conducted in accordance with NASA Standard JSC-28354, Human-Rating Requirements | 1/30/04 |
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All system technologies shall be at a minimum NASA technology readiness level (TRL) of 3 on Jan. 1, 2005, and shall be capable of reaching a TRL of 6 by the technology cut-off date of Jan. 1, 2010 | 1/30/04 |
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All components for MORPHLAB system installation and operation shall be designed for launch on the Atlas V, Delta IV Heavy, or Shuttle-derived launch vehicles. | 1/30/04 |
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All MORPHLAB systems shall be capable of contingency operations without internal pressurization. | 1/30/04 |
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The MORPHLAB program shall be accomplished within the
following funding constraints: |
1/30/04 |
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System shall provide autonomous checkout and unambiguous evidence of functionality prior to committing to the next human . | 1/30/04 |
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All safety-critical systems shall be two-fault tolerant. Sufficient sensors shall be incorporated to allow positive diagnosis of all credible failures. | 1/30/04 |
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Each MORPHLAB module shall be capable
of successful landing and operations with any or all of the following conditions
occuring simultaneously: - 10° slope, any direction - 0.5 m diameter boulder anywhere in landing footprint - residual vertical velocity 1 m/sec - residual horizontal velocity 0.5 m/sec |
2/5/04 |
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MORPHLAB modules shall be able to actively
traverse terrain safely with the following slopes: - 20° cross-slope - 30° direct (forward/backward) slope |
2/5/04 |
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MORPHLAB modules shall be able to drive safely over 0.5 m obstacles in worst-case terrain | 2/5/04 |
| Requirement # | Requirement | Posted |
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All systems shall be designed to provide
a non-negative margin of safety for worst-case loading conditions
incorporating the following factors of safety: - Secondary structure: 1.5 - Primary structure: 2.0 - Pressurized tanks: 3.0 - Pressure lines: 4.0 |
1/30/04 |
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All structural systems shall provide positive margins of safety for all loading conditions due to launch vehicles | 1/30/04 |
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Loading conditions for launch on shuttle-derived cargo vehicles may be assumed to be equivalent to published conditions on the space shuttle | 1/30/04 |
| Requirement # | Requirement | Posted |
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The MORPHLAB communications system shall be capable of supporting continual upload transmission of one channel of high-definition television, download of two channels of HDTV, and bidirection transmission of 10 Mb/sec of digital data | 1/30/04 |
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Systems onboard
MORPHLAB modules shall be capable of operating in any of the following control
modes for any or all of the nominal mission segments: - On-board direct human control - Teleoperation - Supervisory control - On-board autonomous control |
1/30/04 |
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Sufficient sensors shall be incorporated to allow positive diagnosis of all credible failures iin safety-critical systems. | 1/30/04 |
| Requirement # | Requirement | Posted |
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All crew interfaces shall accomodate 95%ile American males to 5%ile Japanese females | 1/30/04 |
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All crew interfaces shall adhere to NASA-STD-3000, Man-Systems Integration Standards | 1/30/04 |
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No solid or liquid waste products shall be left on the lunar surface. | 1/30/04 |
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The nominal human missions to MORPHLAB shall be assumed to consist of four-person crews. | 1/30/04 |
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MORPHLAB shall accommodate daily extravehicular activity by a two-person team. | 1/30/04 |
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In case of the need to mount a rescue mission from Earth, MORPHLAB shall stock sufficient crew consumables to support the nominal crew at a subsistence level for 180 days following the nominal mission increment. | 1/30/04 |
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Radiation dosages shall, under all conditions, conform in all respects to the current NASA standards for astronaut radiation limits. | 1/30/04 |
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System shall provide for emergency alternative access and EVA "bailout" options | 1/30/04 |
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System shall be capable of safely initiating extravehicular operations with zero pre-breathe time. | 1/30/04 |
| Requirement # | Requirement | Posted |
| Requirement # | Requirement | Posted |