smartsuit for extravehicular activity (eva)€¦ · •eva is one of the most dangerous parts of a...
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SmartSuit for ExtraVehicular Activity (EVA)Current Challenges and Spacesuit Technology
Development to Enable Future Planetary Exploration Missions
Prof. Ana Diaz Artiles
Aerospace Engineering, Texas A&M University
Landmark Innovation Forum & Expo 2019
August 28th 2019
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ExtraVehicular Activity (EVA)
• Extravehicular activity (EVA) is any activity performed by a pressure-suited crewmember in unpressurized space environment
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• Why do we want to send humans on EVA?- Limitations on remote control
- Limits on perception, dexterity, mobility
- Time delays
• EVAs have facilitated:- Repair of satellites, including the Hubble Space Telescope
- Construction of the International Space Station (ISS)
- Exploration of the MoonCredits: ESA/NASA
Hoffman and Musgrave repairing the HST, Dec 1993
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Spacesuit – “Tiniest” Spacecraft
• Smallest aircraft capable of sustaining human life
• What do you need to survive in space?
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- Oxygen- Carbon dioxide removal- Pressure- Thermal control- Water- Food- Waste collection- Power- Communication- Radiation protection
Credits: NASA
Diagram of Apollo 14 EMU Suit
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First EVAs• Alexei Leonov perform the first spacewalk on March 18th
1965 - Zvesda Berkut suit , connected by a 15.5m tether, 12 min of EVA
- The suit stiffening force him to reduce the pressure to get back into the airlock
- Heat expenditure exceeded suit capacity
- Sweat, visor, body temp
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• First American spacewalk:- Ed White – 21 min on June 3rd 1965 (Gemini IV)
- Tethered life support, mobility issues
• Lessons learned: mobility, thermal control, training (pool training, equipment)
Credits: NASA
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Apollo EVA
• Arguable the most memorable EVAs ever performed
- Critical for Apollo mission success
• 15 Lunar EVAs by 12 men on 6 missions
• Returned 382 kg of lunar samples
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Aldrin, Apollo 11 (ILC A7L suit, HS-6 portable life support system)
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Apollo Suits
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Figure 6.7.12 in U. S. Spacesuits. 2011 Kenneth S. Thomas. ISBN 978-1441995650
• Function: IVA & EVA• Customized garments!!!!!• Operating pressure: 3.7 psi (25.5 KPa)• Portable life support systems up to 7
hours• Liquid cooling garment for thermal
control• Convolute joints for mobility
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Extravehicular Mobility Unit• Spacesuit pressurized to 29.6 KPa (4.3 psi), 100% oxygen and 14 different layers
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• Three main components:- Liquid cooling and ventilation
garment (LCVG)
• Maintain body temperature
• Proper air circulation
- The Spacesuit Assembly (SSA)
• Hard Upper Torso (HUT): pivoted and planar version
• Arm and glove assembly
• Lower torso assembly: waist, lower torso, legs and feet
- Life Support System (LSS)
• Backpack
Image courtesy of “Human Spaceflight”
Strauss, 2005; Newman, 1997
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EVA-related Injuries
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Strauss, 2004
Jones, 2006Dervay, NASA JSC
Tiger Team, 2003
Tiger Team, 2003
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EVA is a Challenging Activity
• EVA is one of the most dangerous parts of a space mission
• Highly pressurized spacesuits:- Low mobility, high strength required, fatigue- Injuries and discomfort
• Current EMU (4.3 psi), 100% oxygen- Only microgravity environment
• Risks are significant- Fatigue and exhaustion due to poor mobility- Suit injuries- Equipment failure- Decompression sickness- Thermal stress- Radiation exposure
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SmartSuit – Soft-robotics, self-healing & Smart Sensing
1. Full body soft-robotic layer within the gas-pressurized suit to provide high mobility- Layer also provides mechanical counterpressure, allowing a reduction in
gas-operating pressure, further increasing mobility
2. Outer layer made of stretchable self-healing skin
3. Stretchable, integrated, and transparent sensors embedded in the membrane
- Collects and displays environment and skin membrane structural health data
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Hybrid, intelligent, and highly mobile SmartSuit for EVA on a planetary surface (e.g. Mars or Moon)
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Introducing Soft-Robotics in the Spacesuit
• Current exosqueletons are composed of hard robotic elements
• Use of soft-robotic technology with highly compliant robotic elements to facilitate human-spacesuit interactions
• Soft-robotic layer to counteract spacesuit-induced torques on human joints
- Use of musculoskeletal dynamics to investigate its effect on human performance
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Zhao, 2015
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Biomechanics Approach• Soft-robotic elements to “counteract” the effects
of the spacesuit- Spacesuit is modeled as external torques applied to
human joints
- Based on experimental data
- Compilation of a torque-joint database on spacesuit joints
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Schmidt, 2001
Valish, 2012
Schmidt, 2001
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Spacesuit impact on joint torques
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Approach: Comprehensive human-spacesuit interaction analysis• Novel joint-torque relationships when using soft-robotic layer
- e.g. hip, knee, ankle, grasping motions
• Biomechanical analysis - Human joint torques, muscle strength, range of motion
• New operational constraints in a mission to Mars- Requirements for energy expenditures, consumables
• Some level of Mechanical Counterpressure- Less gas to pressurize the suit increase in mobility
- Improvement in pre-breathing times during EVA preparation
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Stretchable Self-Healing Skin
• In situ damage to a spacesuit is a mission critical, life-threatening event
• We propose a self-healing formulation- Low-cost polyurethane elastomer composite of healing
material
- Rapidly healing in case of emergency & structural stable membrane
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Approach: explore healable foam composites and the mechanical properties ofdifferent formulations in the context of SmartSuit• Temperature compatibility, outgassing, fatigue life of composites, bacterial collection
Straining of Formulation B (1.25:1 plasticizer to elastomer ratio) after healing 20 minutes at room temperature
Li et al. Macromol. Rapid Commun. 2019, 40, 1800815
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Smart Sensing – Stretchable optical guidelights
• Stretchable optoelectronics will be embedded into the self-healing membrane to monitor spacesuit stress
- Collects strain information providing feedback to the user about potential failure, what EVA operations are more strenuous, membrane structural health
• Measure the change in power output through the lightguide based on external conditions (i.e. pressure)
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Approach: investigate sensor architectures and display technology• Design principles for SmartSuit, including rationales for material, sensor, and display
technology selection
Stretchable Guidelights
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*Zhao et al. in review
*Zhao et al. (2016)
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Networks of stretchable lightguides (“Optical Lace”) for Position and Force Sensing
*Xu et al. (in review)
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Xu et al., Sci. Rob. (in review)
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*Bai et al., unpublished
Light InE Light Out
Upper core
Lower core
Stretchable Lightguides for Continuous, Multimode Deformation Sensing Potential
**Xu et al., Science Robotics (in press)
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SmartSuit – Increase Human Performance on Several Fronts• Increase in mobility
- Reduced metabolic costs and pre-breathing times
• Increase reparability and usability• Reduction of EVA duration
- Reduced pre-breathing protocols, enhance dexterity, provides structural information and data from the environment
• Technical Approach- Human-spacesuit interaction analysis to quantify improved human factors
requirements• Novel joint-torque relationships, biomechanical analysis, strength, range of motion, metabolic
cost and impact on consumables, etc- Analyze materials and sensor architectures- Outline the Smartsuit system design and concept of operations, including rationales
for materials, sensor, and display technology selection
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Acknowledgement to Team Effort!
Texas A&M University
• Prof. Ana Diaz Artiles
• Logan Kluis
• Nathan Keller
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Cornell University
• Prof Robert Shepherd
• Lillia Bai
• Narahari Iyengar
Thanks!https://www.etsy.com
Work funded by the NASA Innovative Advance Concept program - Phase I
https://bhp.engr.tamu.edu/ https://orl.mae.cornell.edu/