Stelnav 1000 10 23 2012
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StelNav-1000 10/23/2012. Brandon Baker Keegan Colbert Ryan Haughey. Megan Heard Collin Marshall Ben Morales. Travis Ravenscroft. Mission Statement.

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Stelnav 1000 10 23 2012

StelNav-100010/23/2012

Brandon BakerKeegan ColbertRyan Haughey

Megan Heard

Collin MarshallBen Morales

Travis Ravenscroft


Mission statement

Mission Statement

“To expand the domain of humanity beyond the earth for the betterment, preservation, and advancement of all humankind by creating a self-sustaining, mobile habitat that ensures the physical and psychological well-being of its inhabitants.”

  • 24 Month Trip Time

  • 12 Crew Members

  • Capable of Interplanetary Space Travel

Collin Marshall


Systems review

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Ben Morales


Stelnav 1000 10 23 2012

STRUCTURAL DESIGN

Hallway

Central Hub

Habitable Pod

Supporting Truss Structure

Transport Tube


Stelnav 1000 10 23 2012

External structure

Spacecraft Structure

Overall Structural Profile

Dumbbell

Spherical

Toroidal

Cylindrical

Oval Cross Section

Square Cross Section

Circular Cross Section

Tethered

Rigid

Modular Pods

Inhabitable Pods (TRANSHAB)

Uniform Cross Section

3 Sections of Two Pods

Evenly Distributed Pods

Centrally Located Propulsion

Square Cross Section Hallways

Circular Cross Section Hallways

Ben Morales


Design specifications

Design Specifications

  • Torus Radius: 60 m

    • Small radius to reduce mass

  • Preliminary Mass Estimate: 950 MT

  • Rate of Rotation: 3.86 rpm

Keegan Colbert


Layout benefits

Layout Benefits

  • Versatility:

    • Pods can be added or removed and individually designed

  • Continuity:

    • All pods are connected with hallways

  • Large Living Space

  • Flat Floors:

    • Pods do not require curved floors like traditional torus

  • Zero Gravity Central Hub

    • Contains propulsion, power generation, and agricultural production

  • Limited Radiation Shielding:

    • 23.2 rem/year – 29.2 rem/year built in to the inflatable pods

Keegan Colbert


Systems review1

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Megan Heard


Life support

Life Support

Over the course of 2 years, 12 people would consume:

  • 7,360 kg oxygen

  • 26,300 kg water

  • 18,700 kg food

    Recycling is essential for any long term independent space habitation

Megan Heard


Components

Components

  • Atmospheric control

    • Oxygen production and carbon dioxide management

  • Nutrition

    • Food production

  • Waste management

    • Recycling of liquid and solid waste

Megan Heard


Atmospheric control

Atmospheric Control

  • Algae will be used for O2 production and CO2 elimination

  • 96 m2 of algae can provide O2 for a crew of 12

  • 3 pods will have 48 m2 tanks below the lowest floor

  • Algae will require 30 kg of water and will use sunlight to power photosynthesis

  • Mechanical filtration will be used to remove other impurities from the air

Megan Heard


Atmospheric control1

Atmospheric Control

  • The algae grown will be arthrospiraplatensis(Spirolina)

  • Supplement crew member’s diets

  • 57% protein by mass and high in several essential vitamins and minerals

Megan Heard


Nutrition

Nutrition

  • Aeroponics for food growth

  • Aeroponics reduce water usage by 98 percent, fertilizer usage by 60 percent

  • Up to six crop cycles per year, instead of the traditional one to two crop cycles.

Megan Heard


Nutrition1

Nutrition

  • Located in the central hub to take advantage of the lower gravity

  • 200 m2 will be used to produce food for the entire crew of 12

Megan Heard


Waste management

Waste Management

  • In order to be self sustaining, waste products must be used to provide nutrients for agriculture

  • 3 stages of bacterial decomposition will be used to purify water and compost waste into usable fertilizer

Megan Heard


Systems review2

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Travis Ravenscroft


Internal architecture

Internal Architecture

  • Requirements

    • Provide a habitat for a crew of 12

    • 47 m2 floor space per person ( ~ 600 m2 total)

  • Other considerations

    • Psychology of habitable area

    • Coriolis effects

    • Effects of structural vibration on crew comfort

Travis Ravenscroft


Internal architecture1

Internal Architecture

  • Inflatable habitat selected based upon launch and manufacturing considerations

  • Vertical and horizontal designs considered

  • Horizontal design chosen based upon psychology of area, crew have longer lines of sight

Travis Ravenscroft


Internal architecture2

Internal Architecture

  • 6 total habitat structures

    • 2 floors per structure

    • 820 m2 of useable floor space

    • 3 used for living space

    • 1 used for recreation

    • 1 used for spacecraft control operations

    • 1 used for medical and science work

Travis Ravenscroft


Crew living space

Crew living space

  • Lower Floor

    • Kitchen

    • Bathroom

  • Upper Floor

    • Bedrooms

    • Storage space

Travis Ravenscroft


Internal architecture3

Internal Architecture

  • Command and Control module

    • Provides workspace for all personnel

  • Recreation Pod

    • Exercise equipment

    • Sections of upper floor removed

  • Science and Medical Pod

    • Provides lab space for scientific experiments

    • Medical area in case of injury or sickness

Travis Ravenscroft


Systems review3

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Brandon Baker


Guidance navigation control

Guidance, Navigation & Control

Spacecraft Utilities

Navigation

Command and Control

Attitude Determination and Control

Command and Data Computer

Operating System

Pulsing uplink

Optical Nav.

Doppler Shift

Star maps

Linux

Windows

MAC

Fully autonomous

High-level cmd, autonomous task completion

Tele-robotic operation

Sensors

Actuators

GNC Detail

Star Trackers

CMGs

Momentum Wheels

Gyros

Thrusters

Brandon Baker


Systems review4

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Brandon Baker


Stelnav 1000 10 23 2012

Communications

UHF antenna and Receiver

Waveguide Switches

Transponder

Control Unit

Command Detector Unit

High-Gain

Medium-Gain

Low-Gain

Communication Detail

Brandon Baker


Systems review5

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Collin Marshall


Propulsion

Propulsion

Chemical

Ion

Nuclear Thermal Rocket

  • High Thrust

  • Low Isp

  • Low Thrust

  • High Isp

  • High thrust and Isp

  • Radiation danger

Assemble in LEO

VASIMR ENGINE

Travel to Earth-Moon L1 Point

ΔV 2 km/s

Interplanetary Space Travel

Thrusters for attitude control

Mass: 50,000 kg

Cost: $50 mil

Collin Marshall


Systems review6

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Ryan Haughey


Stelnav 1000 10 23 2012

Power

Dynamic

Static

Solar

Nuclear

Photovoltaic

Fuel Cell

Nuclear

Power Detail

Power Module required: 2 MW

Ryan Haughey


Systems review7

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Ryan Haughey


Mission schedule

Mission Schedule

Phase 1: Module Assembly

Structural components launched. Manned missions assemble.

Perimeter modules launched into LEO in paired launches

Propulsion module launched and assembled

Phase 2: Gateway Transit

Deceleration

Main engine burn to reach Lagrange Point

Spin-up commences

Phase 3: Crewed Mission

Main engine burn to reach destination

Engine refuel

Direct launch to rendezvous with station

Ryan Haughey


Mission budget

Mission Budget

Ryan Haughey


Systems review8

Systems Review

  • Structural Overview

  • Life Support

  • Internal Architecture

  • Guidance, Navigation & Control

  • Communication

  • Propulsion

  • Power Plant

  • Mission Planning

  • Design Advantages

Ryan Haughey


Design advantages

Design advantages:

Innovating the Future through…

  • Versatility

  • Livability

  • Sustainability

Ryan Haughey


Questions

Questions?


Command and data computer subsystem

Command and Data Computer Subsystem

  • Command sequence and programs uplink

  • Spacecraft clock

  • Telemetry

  • Data Storage

  • Fault Protection and Safing

  • AACS


Navigation

Navigation

  • Navigation data acquisition

    • Velocity via Doppler shift of coherent downlink

    • Range via pulsing uplink

    • Angular momentum via Differenced Doppler

    • Optical navigation


Spin maintenance attitude control

Spin maintenance Attitude Control

  • Control Momentum Gyroscopes (CMG)

  • Single-gimbal

  • Thrusters

  • Reaction/momentum wheels

  • Back


    Telecommunications subsystem

    Telecommunications Subsystem

    • High-Gain (HGA), Medium-Gain (MGA) and Low-Gain (LGA) Antennas

      • Cassegrain arrangement

    • Transponder (transmitter/receiver with a coherent signal)

    • Communications Relay

      • UHF antenna and receiver for surface vehicle contact and relay

    Back


    Power system solution

    Power System Solution

    Regenerative Closed Brayton CycleDiagram Source: Megawatt Class Nuclear Space Power

    Systems Report - NASA

    Backup Solar Panels on each pair of modules

    System Mass: ~40 MT

    System Mass: ~2.5 MT/pair

    Back


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