Single Line Tethered Glider
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Transcript of Single Line Tethered Glider
9/30/2013 Systems Level Design Review P14462
Single Line Tethered Glider
Team P14462Sub-System Level Design Review
Jon ErbeldingPaul Grossi
Sajid Subhani
Kyle BallMatthew DouglasWilliam Charlock
Team Introduction
Team Member Major
Sajid Subhani Industrial Engineer - Team Lead
Paul Grossi Mechanical Engineer
Matt Douglas Mechanical Engineer
Jon Erbelding Mechanical Engineer
Kyle Ball Mechanical Engineer
Bill Charlock Mechanical Engineer
Agenda● Project Description Review● Engineering Requirements Review● Functional Decomposition Review● Top 3 Concepts from Last Review● Concept Feasibility
● Glider Analysis and Feasibility● Base Station Analysis and Feasibility
● Project Planning● Work Breakdown Structure
Project Description Review● Goal: Design, build, and test a tethered,
small-scale, human-controlled glider.
● Critical Project Objectives:○ Maintain maximum tension on the tether○ Sustaining horizontal and vertical flight
paths○ Measure and record tether tension and
position○ Understand the influential parameters for
sustained, tethered, unpowered flight
Glider
Tether
Base Station
Operator w/controller
Engineering Requirements
Functional Decomposition
Review of Top 3 System Concepts
3 Single Axis Load Cell IMU with Single Axis Load Cell 2 Potentiometers with Single Axis Load Cell
Glider Analysis
Choosing the Glider
Bixler v1.1 EPO Foam Wing span: 1.4 [m] Chord length: 0.2 [m] Mass: 0.65 [kg] Middle mounted propeller Only EPO Foam
Phoenix 2000 EPO Foam Wing span: 2 [m] Chord length: 0.3 [m] Mass: 0.98 [kg] Front mounted propeller Reinforced
Choosing the Glider The smaller Bixler glider creates less
tension for a larger operating range Able to operate with an affordable load cell
Flight Orientation
Flight Orientation
Flight Analysis
Wind Speed: ~ 11 mph
Flight Analysis
Wind Speed: ~ 22 mph
Flight Analysis
Wind Speed: ~ 44 mph
Qualitative DOE
Slower wind speed: lower tension
Larger flight path radius: lower tension
Beta angle peaks: ~ 94-95°
Tension peaks: ~ 20 [m] tether length
Tension must be less than 5000 [N] (1100 lbs)
Quantitative DOE Choosing flight configuration
Inputs Maximum allowable tension Observed wind speed
Outputs Beta angle Tether length Flight path radius
Bridle and Tether Setup Use a tension of 3000 lbs as an overestimate.
Maximum allowable stress for Bixler glider: 30 MPa
Bridle attached at two points on the fuselage causes structural failure at the wing root with 180 MPa
Proposed Tether and Bridle Design
Ideal Bridle Location Analysis
Optimum tether location: 0.51 m from root. Optimum tether angle: 54 deg from airplane
Wing Stress Analysis
Wing Stress Analysis
Maximum stress: 15 MPa
Fuselage Stress Analysis
Tether and Bridle Configuration
Base Station Analysis and Feasibility
2 Potentiometers and Single-Axis Load Cell
Concept 1
Vertical Rotation
Static Analysis
∑ 𝑀𝑜=𝑇𝑟𝑠𝑖𝑛 (𝛿𝜑 )−𝑊 𝐿𝐶𝑑𝑐𝑜𝑠 (𝜃 )−𝑀𝑝𝑜𝑡−𝑀𝑏𝑒𝑎𝑟=0∴𝑇=
𝑀𝑝𝑜𝑡+𝑀𝑏𝑒𝑎𝑟+𝑊 𝐿𝐶𝑑𝑐𝑜𝑠(𝜃)𝑟𝑠𝑖𝑛(𝛿𝜑)
Dynamic Analysis
∑ 𝑀𝑜=𝑇𝑟𝑠𝑖𝑛 (𝛿𝜑 )−𝑊 𝐿𝐶𝑑𝑐𝑜𝑠 (𝜃 )−𝑀𝑝𝑜𝑡−𝑀𝑏𝑒𝑎𝑟=𝐼𝐿𝐶𝛼∴𝑇=
𝐼𝐿𝐶𝛼+𝑀𝑝𝑜𝑡+𝑀𝑏𝑒𝑎𝑟+𝑊 𝐿𝐶 𝑑𝑐𝑜𝑠(𝜃)𝑟𝑠𝑖𝑛(𝛿𝜑)
Dynamic Analysis Continued
Horizontal Rotation
Static Analysis
∑ 𝑀𝑜=𝑇𝑟𝑐𝑜𝑠 (𝜃)𝑠𝑖𝑛 (𝛿𝜆 )−𝑀𝑝𝑜𝑡−𝑀𝑏𝑒𝑎𝑟=0∴𝑇=
𝑀𝑝𝑜𝑡+𝑀𝑏𝑒𝑎𝑟
𝑟 𝑐𝑜𝑠(𝜃)𝑠𝑖𝑛(𝛿𝜆)
3 Single-Axis Load Cells
Concept 2
CAD Model● Created 3-D model of the system in SolidWorks● Works well when the ball joints are kept in
tension as seen in Fig 1.● Ball joints fail when they are put into
compression as seen in Fig 2.
Fig. 1 Fig. 2
Base Station EquipmentPhidgets 3140_0 – S Type Load
CellBourns 3540S-1-103L Potentiometer
Initial Base Station Budget ComparisonP14462 Purchase List for 3 Load Cell Base Station
Part Description Unit Price Qty Individual TotalPhidgets 3140_0 - S Type Load Cell 50 3 150.00Ball End Joint Rod 3.78 6 22.68Shipping 0.00
Total Order Price 172.68
P14462 Purchase List for Potentiometer Base Station
Part Description Unit Price Qty Individual TotalPhidgets 3140_0 - S Type Load Cell 50 1 50.00Bourns 3540S-1-103L Potentiometer 20 2 40.00Miniature Aluminum Base-Mounted Stainless Steel Ball Bearings—ABEC-3 14.92 2 29.84Flanged Open 1/2 Inch Ball and Roller Bearing 7.61 1 7.61Shipping 0.00
Total Order Price 127.45
Project Planning
Project Planning
Work Breakdown Structure (10-12)● Paul: ● Jon: ● Kyle: ● Matt: ● Saj: ● Bill:
Questions?