Interim Review #2 Interim Review #2 RAV Team RAV Team Matthew Allgeier Matthew Allgeier Kevin DiFalco Kevin DiFalco Daniel Hunt Daniel Hunt Derrick Maestas Derrick Maestas Steve Nauman Steve Nauman Jaclyn Poon Jaclyn Poon Aaron Shileikis Aaron Shileikis
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Interim Review #2 RAV Team Matthew Allgeier Kevin DiFalco Daniel Hunt Derrick Maestas Steve Nauman Jaclyn Poon Aaron Shileikis.
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Interim Review #2Interim Review #2
RAV TeamRAV Team
Matthew AllgeierMatthew AllgeierKevin DiFalcoKevin DiFalcoDaniel HuntDaniel Hunt
Check Finish Spec on Seal Surface for Check Finish Spec on Seal Surface for Control Surface SealsControl Surface Seals Optimal rod surface finish < 8Optimal rod surface finish < 8in (0.2 in (0.2
microns)microns) Type 303 Precision Stainless Steel shafts Type 303 Precision Stainless Steel shafts
have a finish of 10 micronshave a finish of 10 microns Sales Engineers at Eclipse engineering Sales Engineers at Eclipse engineering
confirmed that this finish would be confirmed that this finish would be adequate for low speed intermittent useadequate for low speed intermittent use
Hydrodynamics – SummaryHydrodynamics – Summary
Required Airfoil TorqueRequired Airfoil Torque Change in Req. deflection speed (servo Change in Req. deflection speed (servo
New Airtronics 94358Z ServoNew Airtronics 94358Z Servo 200 oz-in (High-Torque)200 oz-in (High-Torque) 1.54 x 0.79 x 1.47 (small – space 1.54 x 0.79 x 1.47 (small – space
constraint)constraint)
Hydrodynamics – IssuesHydrodynamics – Issues
Custom Servo CouplerCustom Servo Coupler Unable to locate small size couplerUnable to locate small size coupler Misfit Shaft to Coupler via HeatMisfit Shaft to Coupler via Heat
ServoServo Problem: Can not rotate 180º for LSM Problem: Can not rotate 180º for LSM
TestTest Solution: Remove Airfoil during Solution: Remove Airfoil during
Electronics tested and partially manufacturedElectronics tested and partially manufactured Battery voltage monitor (2)Battery voltage monitor (2) 4 external channel HOBO data logger4 external channel HOBO data logger
Current IssuesCurrent Issues Integration timeIntegration time
Propulsion – Design Summary and Propulsion – Design Summary and IssuesIssues
Design SummaryDesign Summary1.1. Change in propeller Change in propeller
sizesize2.2. Change in motor Change in motor
mountmount3.3. Change in coupling Change in coupling
for Motor/shaft/propfor Motor/shaft/propIssuesIssues1.1. Need to check on all Need to check on all
orders made orders made recentlyrecently
[PROP 1] Old Motor Mount Configuration
[PROP 2] Tail cap on CNC milling machine
Propulsion – StatusPropulsion – StatusPART STARTED COMPLETED
8-Channel, 72.330 MHz, 3.12 ft whip antenna, 0.75 W8-Channel, 72.330 MHz, 3.12 ft whip antenna, 0.75 W Using less channels than expected due to Switch CapabilitiesUsing less channels than expected due to Switch Capabilities
Problem #1: Receiver/Antenna LocationProblem #1: Receiver/Antenna Location Metallic Housing = EM wave interferenceMetallic Housing = EM wave interference Underwater = Loss ~300 dB/mUnderwater = Loss ~300 dB/m
Solutions:Solutions: Move Antenna outside of RAV via shielded Coaxial CableMove Antenna outside of RAV via shielded Coaxial Cable Match Coaxial Cable Impedance to both Receiver & Match Coaxial Cable Impedance to both Receiver &
AntennaAntenna
Problem #2: Comm during Buoy Subsystems TestProblem #2: Comm during Buoy Subsystems Test Depth > Antenna HeightDepth > Antenna Height
Solution:Solution: Cable (3m?) from Tx to Rx for Buoyancy Subsystems Cable (3m?) from Tx to Rx for Buoyancy Subsystems
TestTest Plan: Use commercial componentsPlan: Use commercial components
LSM – Issues and ProgressLSM – Issues and Progress
Issues - Model AssumptionsIssues - Model Assumptions Control surfacesControl surfaces
Assumes the CS to turn 90Assumes the CS to turn 90° to minimize drag° to minimize drag AntennaAntenna
Drag not included in modelDrag not included in model InertiaInertia
Ignored in modelIgnored in model ProgressProgress
Current design testing completeCurrent design testing complete New design testing in progressNew design testing in progress
discrepancies in solenoidsdiscrepancies in solenoids Provides absolute displacementProvides absolute displacement Adjustable frequencyAdjustable frequency
Testing in progressTesting in progress Possible insufficient motor Possible insufficient motor
torquetorque Results & PurposeResults & Purpose
Improves current designImproves current design Provides a foundation for future Provides a foundation for future
projectsprojects[LSM2] – Partial CAD of 2nd Design
Full Systems Testing – Design Full Systems Testing – Design Changes/IssuesChanges/Issues
Leak Test ChangeLeak Test Change COCO22 Test Discarded Test Discarded
Sublimation Rate too SlowSublimation Rate too Slow Mechanical Valve AddedMechanical Valve Added