uav research international
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UAV Research International. “Providing integrated consultation to MAV project engineers at Eglin AFB” Chris McGrath Neil Graham Alex von Oetinger John Dascomb Sponsor : Dr. Gregg Abate December 6, 2005. OVERVIEW. Problem Statement Design Specifications Project Planning - PowerPoint PPT PresentationTRANSCRIPT
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UAV Research InternationalUAV Research International““Providing integrated consultation to MAV project Providing integrated consultation to MAV project
engineers at Eglin AFB”engineers at Eglin AFB”
Chris McGrathChris McGrathNeil GrahamNeil Graham
Alex von OetingerAlex von OetingerJohn DascombJohn Dascomb
Sponsor :Sponsor :Dr. Gregg AbateDr. Gregg Abate
December 6, 2005December 6, 2005
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OVERVIEWOVERVIEW
Problem StatementProblem Statement Design SpecificationsDesign Specifications Project PlanningProject Planning Design Selection Design Selection Procedure for DesignProcedure for Design Cost AnalysisCost Analysis Spring Proposal Spring Proposal ConclusionConclusion
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Problem StatementProblem Statement
To design a means of testing MAV flight To design a means of testing MAV flight dynamics in an indoor facility dynamics in an indoor facility
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Project SpecsProject Specs
Weight Weight 100 – 200 grams (g) 100 – 200 grams (g) Flight Speed Flight Speed 0 – 25 meters per second 0 – 25 meters per second
(m/s)(m/s) Exterior Material Exterior Material Carbon Fiber Composite Carbon Fiber Composite Wing Tip Length Wing Tip Length 15 – 30 centimeters 15 – 30 centimeters
(cm)(cm) MAV Flight Control MAV Flight Control Both 2 and 3 axis Both 2 and 3 axis Type of Thrust Type of Thrust Pusher, Puller, None Pusher, Puller, None
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Design Selection:Design Selection:Free Flight Wind TunnelFree Flight Wind Tunnel
The free flight wind tunnel has been The free flight wind tunnel has been successfully created before successfully created before
Design is basically a conventional Design is basically a conventional wind tunnel modified to allow for wind tunnel modified to allow for actual free flight of the test subjectactual free flight of the test subject
Force balance achieved around Force balance achieved around
the center of gravity of the MAV, the center of gravity of the MAV, essentially canceling out the essentially canceling out the force from the incident wind force from the incident wind tunnel flow with the thrust of the tunnel flow with the thrust of the engineengine
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Project PlanningProject Planning
Final design analysis divided into 3 section:Final design analysis divided into 3 section:
– Tunnel geometry Tunnel geometry Design of wind tunnel ductingDesign of wind tunnel ducting Selection of fan flowSelection of fan flow Settling screen and honeycomb selectionSettling screen and honeycomb selection
– InstrumentationInstrumentation Onboard measurementOnboard measurement Data collection/display Data collection/display
– MAV handlingMAV handling Control and release of the MAV inside the tunnelControl and release of the MAV inside the tunnel
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Project Planning: Project Planning: Flow ChartFlow Chart
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Design ProcedureDesign Procedure
Design Procedure is broken down into five Design Procedure is broken down into five main sections:main sections:– Wind Tunnel DesignWind Tunnel Design– Flow QualityFlow Quality– Flow FanFlow Fan– InstrumentationInstrumentation– MAV HandlingMAV Handling
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Wind Tunnel DesignWind Tunnel Design
In wind tunnel design In wind tunnel design Three properties are Three properties are most important to most important to consider:consider:
– Test section DimensionsTest section Dimensions
– Flow qualityFlow quality
– Tunnel geometryTunnel geometry
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Wind Tunnel Design:Wind Tunnel Design:Test section DimensionsTest section Dimensions
At its maximum area, wind At its maximum area, wind tunnel must be 6 times that of tunnel must be 6 times that of the test sectionthe test section
The test section should give The test section should give ample area for the MAV to flyample area for the MAV to fly
For the minimum analysis of the For the minimum analysis of the flight, the MAV needs to move flight, the MAV needs to move laterally or vertically twice its laterally or vertically twice its wingspan wingspan
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Wind Tunnel Design:Wind Tunnel Design:Test section Dimensions (continued)Test section Dimensions (continued)
For the largest MAV (12” wingspan) to be tested in tunnel For the largest MAV (12” wingspan) to be tested in tunnel we would need 2 feet of flying area in any given direction or we would need 2 feet of flying area in any given direction or roughly a 4ft x 4ft test sectionroughly a 4ft x 4ft test section
When moving longitudinally against the flow we will allow When moving longitudinally against the flow we will allow for 10ft of movement for the MAV for 10ft of movement for the MAV
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Wind Tunnel Design:Wind Tunnel Design: Flow QualityFlow Quality
The quality of the flow for our The quality of the flow for our application is based on velocity application is based on velocity fluctuations in the direction of the fluctuations in the direction of the airflowairflow
Need a flow quality that has velocity Need a flow quality that has velocity fluctuations of less than 1% of the fluctuations of less than 1% of the
free flowfree flow
Screens and a honeycomb are Screens and a honeycomb are implemented to take out the implemented to take out the rotational and velocity fluctuations rotational and velocity fluctuations of the flow that form when the air of the flow that form when the air passes through the fanpasses through the fan
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Wind Tunnel Design:Wind Tunnel Design: Flow Quality (Continued)Flow Quality (Continued)
The most important factor to flow quality is the The most important factor to flow quality is the contraction ratiocontraction ratio
The larger the contraction ratio, the slower the air The larger the contraction ratio, the slower the air flow is when it passes through the screens and flow is when it passes through the screens and honeycombhoneycomb
For a contraction ratio of 6, combined with the For a contraction ratio of 6, combined with the screens and honeycomb, we can achieve a flow screens and honeycomb, we can achieve a flow quality of less than 1%quality of less than 1%
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Wind Tunnel Design:Wind Tunnel Design: Tunnel GeometryTunnel Geometry
Two different tunnel Two different tunnel Geometries are Geometries are exploredexplored
– Ideal wind tunnel Ideal wind tunnel
– Constrained wind tunnelConstrained wind tunnel
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Wind Tunnel Design:Wind Tunnel Design: Tunnel Geometry – Ideal tunnelTunnel Geometry – Ideal tunnel
Larger tunnel overallLarger tunnel overall
Utilizes full test section and Utilizes full test section and contraction ratiocontraction ratio
Implements a 4.5*4.5 ft test Implements a 4.5*4.5 ft test section to compensate for section to compensate for Boundary phenomenon ( only Boundary phenomenon ( only 80% of area is usable)80% of area is usable)
Test section has length of 10 ftTest section has length of 10 ft
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Wind Tunnel Design:Wind Tunnel Design: Tunnel Geometry – Ideal tunnel (continued)Tunnel Geometry – Ideal tunnel (continued)
*ADD ADDITIONAL *ADD ADDITIONAL INFO*INFO*
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Wind Tunnel Design:Wind Tunnel Design: Tunnel Geometry – Constrained tunnelTunnel Geometry – Constrained tunnel
Designed to fit inside the space Designed to fit inside the space currently provided at Eglin AFBcurrently provided at Eglin AFB (room measuring (room measuring 40x30x15 ft40x30x15 ft ) )
Only aspect of the ideal tunnel Only aspect of the ideal tunnel that is too large for the room is that is too large for the room is
the tunnel lengththe tunnel length
Need to shorten the tunnel by Need to shorten the tunnel by 21.3 ft21.3 ft
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Wind Tunnel Design:Wind Tunnel Design: Tunnel Geometry – Constrained tunnel Tunnel Geometry – Constrained tunnel
(Continued)(Continued) *ADD ADDITIONAL *ADD ADDITIONAL
INFO*INFO*
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Flow QualityFlow Quality
Flow quality will be of Flow quality will be of paramount importance paramount importance in tunnel designin tunnel design
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Free Flight DiagramFree Flight Diagram
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Wind Tunnel GeometryWind Tunnel Geometry
Area required to fly 4 ft x 4 ftArea required to fly 4 ft x 4 ft
Test section area is 4.5 ft x 4.5 ftTest section area is 4.5 ft x 4.5 ft
Test section length greater than 10 ftTest section length greater than 10 ft
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Wind Tunnel GeometryWind Tunnel Geometry
Fan SpecificationsFan Specifications
– Mass flow rate: 60.8 kg/sMass flow rate: 60.8 kg/s
– Ideal power needed: 50 hpIdeal power needed: 50 hp
– Diameter of fan: 7.1 ftDiameter of fan: 7.1 ft
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Wind Tunnel GeometryWind Tunnel Geometry
Final ExpansionFinal Expansion
– Final area is 8 times test section areaFinal area is 8 times test section area
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Wind Tunnel GeometryWind Tunnel Geometry
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Tether SystemTether System
Tether LocationTether Location
Tether Restraint and Release SystemTether Restraint and Release System
Tether Reel Tether Reel
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Tether LocationTether Location
Above and below MAV’s center of massAbove and below MAV’s center of mass
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Restraint and Release System Restraint and Release System
Tether ClampTether Clamp
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Tension ReelTension Reel
Miyamae'sMiyamae's Command X-1 Command X-1
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InstrumentationInstrumentation
OnboardOnboard
Flow Measurement Flow Measurement
Data Collection SoftwareData Collection Software
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Onboard InstrumentationOnboard Instrumentation
Kestrel AutopilotKestrel Autopilot– 16.65 grams (2” x 1.37” x .47”)16.65 grams (2” x 1.37” x .47”)– Three-axis rate gyrosThree-axis rate gyros– AccelerometersAccelerometers– Air pressure sensorsAir pressure sensors
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Flow MeasurementFlow Measurement
Pitot-Static TubePitot-Static Tube
Hot-Wire Anemometer Hot-Wire Anemometer
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Data Collection SoftwareData Collection Software
Virtual CockpitVirtual Cockpit
LabviewLabview
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On-Going Activities On-Going Activities
Source the Fan Source the Fan Find manufacturer to produce settling Find manufacturer to produce settling
screensscreens Create Bill of Materials Create Bill of Materials Build Pro-E model of systemBuild Pro-E model of system
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