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9/30/2013 Systems Level Design ReviewP14462 Single Line Tethered Glider Team P14462 Sub-System Level Design Review Jon Erbelding Paul Grossi Sajid Subhani Kyle Ball Matthew Douglas William Charlock

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Team Introduction Team MemberMajor Sajid SubhaniIndustrial Engineer - Team Lead Paul GrossiMechanical Engineer Matt DouglasMechanical Engineer Jon ErbeldingMechanical Engineer Kyle BallMechanical Engineer Bill CharlockMechanical Engineer

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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

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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

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Engineering Requirements

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Functional Decomposition

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Review of Top 3 System Concepts 3 Single Axis Load Cell IMU with Single Axis Load Cell 2 Potentiometers with Single Axis Load Cell

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Glider Analysis

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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

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Choosing the Glider The smaller Bixler glider creates less tension for a larger operating range Able to operate with an affordable load cell

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Flight Orientation

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Flight Analysis Wind Speed: ~ 11 mph

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Flight Analysis Wind Speed: ~ 22 mph

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Flight Analysis Wind Speed: ~ 44 mph

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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)

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Quantitative DOE Choosing flight configuration Inputs Maximum allowable tension Observed wind speed Outputs Beta angle Tether length Flight path radius

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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

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Proposed Tether and Bridle Design

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Ideal Bridle Location Analysis Optimum tether location: 0.51 m from root. Optimum tether angle: 54 deg from airplane

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Wing Stress Analysis

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Maximum stress: 15 MPa

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Fuselage Stress Analysis

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Tether and Bridle Configuration

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Base Station Analysis and Feasibility

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2 Potentiometers and Single-Axis Load Cell Concept 1

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Vertical Rotation

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Static Analysis

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Dynamic Analysis

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Dynamic Analysis Continued

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Horizontal Rotation

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Static Analysis

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3 Single-Axis Load Cells Concept 2

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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

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Base Station Equipment Phidgets 3140_0 S Type Load CellBourns 3540S-1-103L Potentiometer

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Initial Base Station Budget Comparison P14462 Purchase List for 3 Load Cell Base Station Part DescriptionUnit PriceQtyIndividual Total Phidgets 3140_0 - S Type Load Cell503150.00 Ball End Joint Rod3.78622.68 Shipping 0.00 Total Order Price 172.68 P14462 Purchase List for Potentiometer Base Station Part DescriptionUnit PriceQtyIndividual Total Phidgets 3140_0 - S Type Load Cell50150.00 Bourns 3540S-1-103L Potentiometer20240.00 Miniature Aluminum Base-Mounted Stainless Steel Ball Bearings ABEC-314.92229.84 Flanged Open 1/2 Inch Ball and Roller Bearing7.611 Shipping 0.00 Total Order Price 127.45

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Project Planning

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Work Breakdown Structure (10-12) Paul: Jon: Kyle: Matt: Saj: Bill:

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Questions?

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References http://www.hobbyking.com/hobbyking/store/__13994__Phoenix_2000_EPO_Composite_R_C_Glider_Plug_Fly_.html http://www.youtube.com/watch?v=ZfqGrzCKauw&list=PL0F209186D3388842