Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Subsurface Access Mechanism Life in the Atacama Design Review December 19, 2003 Stu.

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Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Subsurface Access Mechanism Life in the Atacama Design Review December 19, 2003 Stu Heys, Dimi Apostolopoulos

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon SAM Purpose and Objectives Science Investigation Find life Detect environmental boundary conditions of microorganic life Examine biological oases and microorganic communities Mechanism Objectives Access subsoil to depth of 3-5 cm Create furrow and disturb surface layer Overturn rocks (<20cm,<2kg) Measure soil properties

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Relevant Space-Bound Technology Courtesy: Honeybee Robotics, JPL Rock Abrasion Scooping Deployment Mechanisms Micro-Coring Too expensive or hard to acquire Our application requires larger SAM footprint

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon SAM Requirements & Design Issues Low mass and power Passive vs. Actuated Method of deployment Packaging with relevant instruments Method of physical interaction Plow, Scoop or Drill Time for operation Integration with Hyperion Robustness: Many operations, various soils SAM Footprint vs. Hyperion footprint Entrapment Needed stiffness Development Y1Soil & Plowing Test Y2Prototype Test Y3Complete

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Field Implementation

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Plow Concept #1 (Prototyped & Tested)

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Evaluation of 1 st Prototype Pros Worked in loose soil, gravel, and rocks Plow profile and scale appropriate for task Creates consistent furrow Requires minimal power for surface scraping Cons Could cause rover to get stuck Requires high downward load

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Power Measurements

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Plowing Power vs. Normal Driving Pile of slag Dug 2”-4” 0.3 m/s without plow comparable

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Initial SAM Design Concept Backwards facing deployable plow Cut furrow ~3 cm deep along path Overrun small rocks via compliant force actuation Minimal selectivity

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Technical Approach Continue to develop pieces of the SAM mechanism and test with rover in the field Pursue a passively deployed plow for year 2

Life in the Atacama, Design Review, December 19, 2003 Carnegie Mellon Implementation Issues Package actuation for deployment and downward force application in single mechanism Engineer deployment mechanism that provides self-protection and eliminates rover hang-up Fine tune mechanism to ensure continuous shallow plowing Coordinate with rover state feedback to detect problems during deployment

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