single line tethered glider - rochester institute of...
TRANSCRIPT
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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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10/24/2013 Subsystem Level Design Review P14462
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
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10/24/2013 Subsystem Level Design Review P14462
Agenda
● Project Description Review
● Engineering Requirements 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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10/24/2013 Subsystem Level Design Review P14462
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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10/24/2013 Subsystem Level Design Review P14462
Engineering Requirements Metric No. Metric Marginal Value Ideal Value Units
1 Wingspan <=2 <1 m
3 System Cost <500 $
4 Length of Looping Flight >2 >=3 min
5Resolution of Tension
Data<=0.1 <=0.01 N
6Resolution of Angular
Position Data<=0.5 <=0.1 deg
7 Typical Repair Time 5 3 min
8 Data Sampling Rate >=100 >=500 Hz
9Minimal Operational Wind
Speed at Ground Level5 2.5 m/s
10
Maximum Operational
Wind Speed at Ground
Level
5 10 m/s
11Safe for User and
ObserverYes Yes Binary
12Number of Looping Trials
Demonstrated>=25 >=30 Integer
13 Training Time (1st Time) <30 <20 min
14Number of Left Right
Horizontal Trials>=25 >=30 Integer
15 Tether length >=15 >=30 m
16Glider Orientation
KnowledgeBridle angle
Bridle, yaw,
attack, & roll
angles
deg
Yellow: Major design
Biege: DAQ
Grey: Test flight
White: System environment
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10/24/2013 Subsystem Level Design Review P14462
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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10/24/2013 Subsystem Level Design Review P14462
Glider Analysis
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10/24/2013 Subsystem Level Design Review P14462
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
$120
Phoenix 2000 EPO Foam
Wing span: 2 [m]
Chord length: 0.3 [m]
Mass: 0.98 [kg]
Front mounted propeller
Reinforced
$150
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10/24/2013 Subsystem Level Design Review P14462
Price Sheet for Glider
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10/24/2013 Subsystem Level Design Review P14462
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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10/24/2013 Subsystem Level Design Review P14462
Flight Orientation
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10/24/2013 Subsystem Level Design Review P14462
Flight Orientation
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10/24/2013 Subsystem Level Design Review P14462
Flight Analysis
Wind Speed: ~ 11 mph
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10/24/2013 Subsystem Level Design Review P14462
Flight Analysis
Wind Speed: ~ 22 mph
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10/24/2013 Subsystem Level Design Review P14462
Flight Analysis
Wind Speed: ~ 44 mph
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10/24/2013 Subsystem Level Design Review P14462
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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10/24/2013 Subsystem Level Design Review P14462
Quantitative DOE
Choosing flight configuration
Decision variables
Beta angle
Tether length
Flight path radius
Constraints
Maximum allowable tension
Observed wind speed
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10/24/2013 Subsystem Level Design Review P14462
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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10/24/2013 Subsystem Level Design Review P14462
Proposed Tether and Bridle Design
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10/24/2013 Subsystem Level Design Review P14462
Ideal Bridle Location Analysis
Optimum tether location: 0.51 m from root.
Optimum tether angle: 54 deg from airplane
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10/24/2013 Subsystem Level Design Review P14462
Wing Stress Analysis
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10/24/2013 Subsystem Level Design Review P14462
Wing Stress Analysis
Maximum stress: 15 MPa
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10/24/2013 Subsystem Level Design Review P14462
Fuselage Stress Analysis
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10/24/2013 Subsystem Level Design Review P14462
Tether and Bridle Configuration
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10/24/2013 Subsystem Level Design Review P14462
Base Station Analysis
and Feasibility
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10/24/2013 Subsystem Level Design Review P14462
2 Potentiometers and Single-Axis
Load Cell
Concept 1
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10/24/2013 Subsystem Level Design Review P14462
Vertical Rotation
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10/24/2013 Subsystem Level Design Review P14462
𝛿𝛽 = 𝛿𝜃 + 𝛿𝛾 = 0.5 𝑑𝑒𝑔
𝛿𝛾 = 0.5 − 𝛿𝜃 = cos−1𝑟 + 𝐿𝑐𝑜𝑠(𝛿𝜑)
𝐿2 + 𝑟2 + 2𝑟𝐿𝑐𝑜𝑠(𝛿𝜑)
Solve for maximum allowable 𝛿𝜑
such that the resolution
requirement is met, and load cell
begins to move
Metric No. Metric Marginal Value Ideal Value Units
6 Resolution of Angular
Position Data <=0.5 <=0.1 degree
Engineering Spec Considerations
From application of
Law of Cosines
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10/24/2013 Subsystem Level Design Review P14462
Static Analysis
𝑀𝑜 = 𝑇𝑟𝑠𝑖𝑛 𝛿𝜑 −𝑊𝐿𝐶𝑑𝑐𝑜𝑠 𝜃𝑏 −𝑀𝑝𝑜𝑡 −𝑀𝑏𝑒𝑎𝑟 = 0
∴ 𝑇 =𝑀𝑝𝑜𝑡 +𝑀𝑏𝑒𝑎𝑟 +𝑊𝐿𝐶𝑑𝑐𝑜𝑠(𝜃𝑏)
𝑟𝑠𝑖𝑛(𝛿𝜑)
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10/24/2013 Subsystem Level Design Review P14462
Dynamic Analysis
𝑀𝑜 = 𝑇𝑟𝑠𝑖𝑛 𝛿𝜑 −𝑊𝐿𝐶𝑑𝑐𝑜𝑠 𝜃 − 𝑀𝑝𝑜𝑡 −𝑀𝑏𝑒𝑎𝑟 = 𝐼𝐿𝐶𝛼
∴ 𝑇 =𝐼𝐿𝐶𝛼𝑏 +𝑀𝑝𝑜𝑡 +𝑀𝑏𝑒𝑎𝑟 +𝑊𝐿𝐶𝑑𝑐𝑜𝑠(𝜃𝑏)
𝑟𝑠𝑖𝑛(𝛿𝜑)
𝛼𝑏 =𝑑𝜔𝑏𝑑𝑡 𝑤ℎ𝑒𝑟𝑒 𝜔𝑏 =
𝜔𝑝𝑅𝑐𝑜𝑠 𝜃𝑝𝐿 + 𝑟
𝑤ℎ𝑒𝑟𝑒 𝜃𝑝 = 𝜔𝑝𝑡
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10/24/2013 Subsystem Level Design Review P14462
Horizontal Rotation
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10/24/2013 Subsystem Level Design Review P14462
Static Analysis
𝑀𝑜 = 𝑇𝑟𝑐𝑜𝑠(𝜃𝑏)𝑠𝑖𝑛 𝛿𝜆 −𝑀𝑝𝑜𝑡 −𝑀𝑏𝑒𝑎𝑟 = 0
∴ 𝑇 =𝑀𝑝𝑜𝑡 +𝑀𝑏𝑒𝑎𝑟𝑟𝑐𝑜𝑠(𝜃𝑏)𝑠𝑖𝑛(𝛿𝜆)
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10/24/2013 Subsystem Level Design Review P14462
Dynamic Analysis
𝑀𝑜 = 𝑇𝑟𝑐𝑜𝑠(𝜃𝑏)𝑠𝑖𝑛 𝛿𝜆 −𝑀𝑝𝑜𝑡 −𝑀𝑏𝑒𝑎𝑟 = 𝐼𝐿𝐶𝛼𝑏
∴ 𝑇 =𝐼𝐿𝐶𝛼𝑏 +𝑀𝑝𝑜𝑡 +𝑀𝑏𝑒𝑎𝑟𝑟𝑐𝑜𝑠(𝜃𝑏)𝑠𝑖𝑛(𝛿𝜆)
𝛼𝑏 =𝑑𝜔𝑏𝑑𝑡 𝑤ℎ𝑒𝑟𝑒 𝜔𝑏 =
𝜔𝑝𝑅𝑠𝑖𝑛 𝜃𝑝𝐿 + 𝑟
𝑤ℎ𝑒𝑟𝑒 𝜃𝑝 = 𝜔𝑝𝑡
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10/24/2013 Subsystem Level Design Review P14462
3 Single-Axis Load Cells
Concept 2
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10/24/2013 Subsystem Level Design Review P14462
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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10/24/2013 Subsystem Level Design Review P14462
Base Station Cost Feasibility
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10/24/2013 Subsystem Level Design Review P14462
Base Station Equipment
Phidgets 3140_0 – S Type Load Cell Bourns 3540S-1-103L Potentiometer
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10/24/2013 Subsystem Level Design Review P14462
Initial Base Station Budget Comparison
P14462 Purchase List for 3 Load Cell Base Station
Part Description Unit Price Qty Individual Total
Phidgets 3140_0 - S Type Load Cell 50 3 150.00
Ball End Joint Rod 3.78 6 22.68
Shipping 0.00
Total Order Price 172.68
P14462 Purchase List for Potentiometer Base Station
Part Description Unit Price Qty Individual Total
Phidgets 3140_0 - S Type Load Cell 50 1 50.00
Bourns 3540S-1-103L Potentiometer 20 2 40.00
Miniature Aluminum Base-Mounted Stainless Steel Ball Bearings—
ABEC-3 14.92 2 29.84
Flanged Open 1/2 Inch Ball and Roller Bearing 7.61 1 7.61
Shipping 0.00
Total Order Price 127.45
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10/24/2013 Subsystem Level Design Review P14462
Project Planning Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8 Week 9 Week 10 Week 11 Week 12 Week 13 Week 14 Week 15 Week 16
26-Aug 2-Sep 9-Sep 16-Sep 23-Sep 30-Sep 7-Oct 14-Oct 21-Oct 28-Oct 4-Nov 11-Nov 18-Nov 25-Nov 2-Dec 9-Dec
Phase 1
Team Organization
Problem Definition and comprehension
Research complimentary projects
Week 3 Presentation preparation
Phase 2
Update critical needs on EDGE website
Acquire Glider Flight Skills
Functional Decomposition
Benchmarking base stations
Benchmarking marketable Gliders
Determine PUGH Diagram
Critical eng. theory ID and comprehension
Week 6 Presentation preparation
Phase 3
Price compare bought gliders/order glider
Theoretical flight simulation development
Use simulation to calculate feasible tension values
Develop preliminary base station sketches and CAD models
Preliminary base station calculations for feasibility
Understand components of DAQ
Identify critical components of DOE
Week 9 Presentation preparation
Phase 4
Budget approval
Finalize base station calculations
Fly glider and understand effects of tether
Develop implementation of tether/bridal
Investigate glider reinforcement options (Carbon fiber)
Refine simulation to aid DOE
Create algorithm to meet DOE needs
Determine specific sensors and building materials
Begin to develop/modify LabVIEW code for DAQ
Week 12 Presentation preparation
Phase 5
Order Materials
Week 16 Presentation
Gate Review - "Green Light"
Legend
Complete
WIP
Incomplete
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10/24/2013 Subsystem Level Design Review P14462
Project Planning
Week 7 Week 8 Week 9 Week 10 Week 11 Week 12
7-Oct 14-Oct 21-Oct 28-Oct 4-Nov 11-Nov
Phase 3
Price compare bought gliders/order glider
Theoretical flight simulation development
Use simulation to calculate feasible tension values
Develop preliminary base station sketches and CAD models
Preliminary base station calculations for feasibility
Understand components of DAQ
Identify critical components of DOE
Week 9 Presentation preparation
Phase 4
Budget approval
Finalize base station calculations
Fly glider and understand effects of tether
Develop implementation of tether/bridal
Investigate glider reinforcement options (Carbon fiber)
Refine simulation to aid DOE
Create algorithm to meet DOE needs
Determine specific sensors and building materials
Begin to develop/modify LabVIEW code for DAQ
Week 12 Presentation preparation
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10/24/2013 Subsystem Level Design Review P14462
Incomplete Tasks from Phase 3
● Control and stability calculations
● DAQ system development (setup, code)
● Sensors analysis (calibration, implementation)
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10/24/2013 Subsystem Level Design Review P14462
Work Breakdown Structure (10-12)
● Paul: Tether and glider reinforcement and DOE
● Jon: Finalize base station calculations, sensors
and build materials
● Kyle: Finalize base station calculations,
sensors and build materials
● Matt: Tether and glider reinforcement and DOE
● Saj: Continue to develop DOE, create DOE
algorithm, team management
● Bill: Purchase glider, develop/modify LabVIEW
for DAQ, sensors and build materials
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10/24/2013 Subsystem Level Design Review P14462
Questions?