ENAE 697 Term Project Details - spacecraft.ssl.umd.edu

Term Project DetailsENAE 697 -Space Human Factors and Life Support

U N I V E R S I T Y O FMARYLAND

ENAE 697 Term Project Details

• Reminder of original statement of term project• Revisions to project organization• Details of TURTLE• Details of Minimum Functional Habitat

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© 2009 David L. Akin - All rights reservedhttp://spacecraft.ssl.umd.edu



Term Design Project Goals

• Provide opportunity to use principles of class to perform open-ended realistic design

• Reinforce experiences with engineering in teams, making technical presentations

• Address a problem of real interest to NASA• Provide opportunity for graduate involvement in

design competitions (e.g., RASC-AL)

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Term Design Project

• Select one of two lunar habitats under active research in the Space Systems Laboratory– TURTLE (small pressurized rover)– Minimum Functional Habitat

• Perform detailed design of habitat interior– Interior layout– Accommodations for habitability and human factors– Selection, design, and layout of life support systems– Operational interfaces (e.g., storage, steering, EVA)

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2008 ENAE 484 Design Project - TURTLE

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UMd Minimum Functional Habitat for ESMD

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Term Design Project Implementation• Break up into teams of 3-4 people (six in-class

teams; NIA students constitute a team, remote students perform individual studies)

• Selection/allocation of assignments to rover or surface habitat (~equal numbers of teams on each)

• Perform detailed designs based on material in lectures

• Final presentations at end of term• Best teams in each category entered in RASCAL

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Term Design Project, Revised• Each team will investigate both lunar habitats

under active research in the Space Systems Laboratory– TURTLE (small pressurized rover)– Minimum Functional Habitat

• Perform detailed design of habitat interiors– Interior layout– Accommodations for habitability and human factors– Selection, design, and layout of life support systems– Operational interfaces (e.g., storage, steering, EVA)

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Term Design Project Implementation• Break up into teams of 5 people (four in-class

teams; NIA students constitute a team, remote students perform individual studies on either habitat or rover, your choice)

• Each team will perform detailed designs for both habitats, with particular attention on opportunities for commonality and innovative solutions for different applications

• Perform detailed designs based on material in lectures

• Final presentations at end of term• Best teams in each category entered in RASCAL

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Rover Level 1 Rqmts (Mission Planning)1. The lunar rover, along with all transportation

infrastructure, shall be designed to launch on an existing EELV-class launcher or equivalent

2.The rover shall be capable of autonomous landing on unimproved sites equivalent to those selected for J-class Apollo mission

3.The rover shall be capable of autonomously off-loading from the lander

4.The rover shall be capable of autonomously driving ≤10 km to rendezvous with the crew

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Rover Level 1 Rqmts (Crew Systems)

5.Rover shall accommodate crew sized ranging from 95th percentile American male to 5th percentile American woman

6.All crew interfaces shall be in accordance with CxP 70024, with secondary adherence to NASA STD-3000

7.Rover shall provide life support for nominal mission plus 48 hours contingency

8.Rover shall support nominal two-person EVAs without cabin depressurization

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Rover Level 1 Rqmts (Crew Systems)9.Access to and from the surface shall be

compatible with safe traverses by pressurized subjects in Earth gravity

10.Emergency egress options with pressure suits shall be available at all times

11.Cabin atmosphere and pressure shall be chosen to provide safe zero-prebreathe egress

12.Rover design shall ensure sufficient direct sight lines and illumination to allow safe driving in daylight or night conditions

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Rover Level 1 Rqmts (Performance)

13.Rover shall have a maximum operating speed of at least 15 km/hour on level, flat terrain

14.Rover shall be designed to accommodate a 0.5 meter obstacle at minimal velocity

15.Rover shall be designed to accommodate a 0.1 m obstacle at a velocity of 7.5 km/hour

16.Rover shall be designed to accommodate a 20° slope in any direction at a speed of at least 5 km/hour with positive static and dynamic margins

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Rover Level 1 Rqmts (Avionics)17.Rover shall be capable of being controlled

directly, in teleoperation, and autonomously18.Rover shall be capable of being driven while

depressurized19.Rover shall be capable of communicating at

HDTV rates direct to Earth20.Rover shall provide voice/data/video to and

from pressure suits during EVAs21.All critical systems shall be two-fault tolerant,

with instrumentation for status monitoring

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Rover Level 1 Rqmts (Field Rover)22.Rover shall be capable of supporting simulated

EVAs using future MX-series pressure suits23.Rover shall maintain a constant pressurization

of at least 0.5 psi throughout operations24.Rover shall be capable of three-day

independent field trials exclusive of energy resupply

25.Rover shall be capable of being transported on public roads without special permits or licenses

26.Rover shall be designed for positive mobility through regions of soft sand

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Level 1 Requirements (Management)

27.Design team shall specify support equipment and spares to support two weeks of field trials

28.Design team shall establish and maintain a canonical reference configuration for all systems, including budgets with margins for mass, cost, and power of the crew systems

29.Unless otherwise noted, all systems shall be designed in accordance with NASA standards and requirements (applicable documents list TBD)

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Level 1 Requirements (ENAE 697)

30.The reference mission shall be for 72 hours with 50 km of driving and three 6-hour EVAs

31.The life support system design shall incorporate the means of replenishing consumables between sorties

32.Total crew accommodations mass must include the provision of sufficient Li-Ion batteries at 100 W-hr/kg to perform the nominal mission plus contingency

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Level 1 Requirements (ENAE 697)33.The pressure hull of TURTLE is 1.8 m (71 in)

inner diameter, and nominally 1.83 (72 in) cylindrical diameter, oriented horizontally, with 4:1 ellipsoidal end caps

34.Teams may redesign the endcaps to accommodate windows, hatches, and other essential design features

35.Teams may change the length of the cylindrical section of the habitat up to a maximum of 2.44 m (96 in), but will incur a weight penalty of 1.73 kg/cm (11.2 lb/in) for length beyond nominal

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UMd Final MFH Design• 3.65 m diameter• 5.5 m tall• 4:1 ellipsoidal

endcaps• Three module

berthing ports (Cx standard)

• Four suitports (two in berthing hatches)

• Inflatable airlock18



Habitat Orthogonal Views

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Lower Level Layout

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CTB Stowage Racks

Waste Collection

Multipurpose Table

Air Handling and CO2 Scrubbing

Water Recycling



Upper Level Layout

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Galley Wall - Food PreparationIndividual Crew

Berths

CTB Stowage Racks

Table and Seats Opened for Meals; Stowed Otherwise



Habitat Level 1 Requirements

1. The habitat shall be designed for a nominal mission length of 28 days, with 30 days contingency

2.The nominal habitat configurations is a vertically oriented cylinder, with two floors of 3.63 m (143 in) inner diameter and a standing head height of 2.18 m (84 in). The total cylindrical height is 4.57 m (180 in), with 4:1 ellipsoidal end caps on each end. The lower end of the cylinder is 0.61 m (24 in) above the ground.

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3.The life support system design shall incorporate the means of replenishing consumables between sorties

4.The interior of the habitat shall accommodate, at the minimum, stowage for 92 cargo transfer bags (CTBs), each 9x9x16 in

5.The habitat shall be designed for a nominal crew of four, ranging from a 95th% American male to 5th% American female.

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6.In a contingency, the habitat shall support a crew of 8 for up to 72 hours

7.The habitat shall support EVAs without restriction (up to four at a time)

8.The habitat shall be designed to minimize or eliminate interior contamination with lunar dust

9.All crew accommodations (life support and habitability systems) shall not exceed a total mass of 2000 kg

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Evaluation Criteria

• Each team shall submit by Monday, May 11:– A 15-page summary paper to RASC-AL specifications– A slide package for a 30-minute summary

presentation (this will be the slide package used for the final presentations on 5/12 and 5/14)

– A slide package with comprehensive documentation on design activities of the team

• The winning team will have to add additional items for the competition June 1-3 in Cocoa Beach

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Decision Criteria

TBD26

ENAE 697 Term Project Details - spacecraft.ssl.umd.edu

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