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NASA Lunabotics Mining Competition Interim Design Presentation Team 19: Aleks Fedoriw Duncan Haldane Arthur Pack Michael Pearse Carlos Ruiz
Chassis Material: – Aluminum 6063 ¾” Square Tubing ¼” Plate Primary Focus: – Attachment for Motor/Gearbox Assembly – Attachment for Excavation/Dumping Systems
Chassis Additional Constraints: – 1m x.370m Max Dimensions – Minimize Weight Mass Calculations (ProEngineer) : –Volume = 3.33e+06 mm 3 –Surface Area = 1.33e+06 mm 2 –Density = 2.685e-06 kg/mm 3 –Total Mass = 8.95 kg
Walking Walking using hip actuated leg Torque at touchdown: 70 Nm @ 1.5 Hz Motor: 18V (36V) Maxon RE65 with 50:1 gear reduction – 35 A draw for each motor – Need 105 A capability
Leg Design Semi-circular legs 0.297 m in Diameter, 9cm wide Need Radial Stiffness of 15,905 N/m – Pseudo Rigid Body Model w = 0.09m; t = 0.00518m
FEA Simulation For a 1 kN load – Vertical tip Deflection: 65.93mm – K = 1000/0.06593 = 15,167 N/m Vertical Deflection
Excavator System Bucket Chain system Uses lower plate to hold material while scoops push it along Swivels on a four-bar linkage Powered by a single motor
Bucket System Uses two power screws to lift bucket Cable connected to frame forces bucket to dump contents Lid is hinged to allow contents to dump farther away from the bucket Very lightweight
System Power Circuit
Battery Type Lithium Ion Polymer Packing10 pcs High Power Polymer Li-Ion Cell: 3.7V 10 Ah Voltage37V Capacity10 Ah Max. Discharging Rate 70A Weight5 Lb. Cost $699.95
Sensors Webcam Weight Sensors Bump Sensor
Questions? ? 18
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