wildlife tracker: detailed design review msd i team p14347
TRANSCRIPT
Wildlife Tracker: Detailed Design
Review
MSD I
Team P14347
Team P14347 & Introduction
Member Role
Eric Peterson Team Leader / EE
Alex Pelkey ME
Joseph Ciccarello EE
Frank Meola EE
Timothy Nash ME
AgendaProgress ReportProject BackgroundSystem AnalysisMechanical AnalysisElectrical AnalysisRisk AssessmentTest PlanAction Items/MSD II PlanQuestions
Current & Desired State Injured animals can travel substantial distances, may be
difficult to track Game which has been shot and cannot be found leads to
more animal deaths and inefficient hunting Wildlife Tracker will detach from arrow and remain attached
to animal Handheld device will provide GPS location of animal
Progress Report Cellphone & Google Maps Integration has been researched &
found to be a viable User Module Circuitry Block Diagrams Established (w/ Pin Connections) Enclosure Model Completed Began Purchasing Test Parts
Arrows & Broadheads Linx Technologies
Initial Arrow Attachment Deviation Experiment ready for trial Refined Budget Faculty Review Consultations Completed
Dr. Amuso Dr. P. Venkataraman
Previous Questions: Burst vs. Continuous Transmission – Burst will utilized for the
application (10-15 min. bursts) FCC Safety Requirements – SAR (Specific Absorption Rate) 1.6
W/kg
StakeholdersPrimary Customer: Dr. Eli SaberFaculty Guide: Art NorthEnd Users: Bow HuntersOther: Hunting Stores/Distributors, Game Wardens,
Environmental Activists, Linx TechnologiesMSD Team 14347
Project Deliverables Durable re-attachable tracking device that connects onto an
arrow Handheld user device that monitors the location of the GPS
attachment ‘Second Chance’ retrieval feature (In case shot is not fatal) Intuitive, easy to understand User Manual Cellphone GPS application
Benchmarking GameVector Deer Recover System
• $399.99• 45 Grains (2.9 grams)• Battery life of 48-72 hours• Up to two mile range• Tested for bows shooting up to 300 feet per second• Currently sold out
Customer Requirements
Customer Rqmt. #
Importance Description
CR1 9 The device locates the wildlife after being shot.CR2 9 Device detaches from arrow and attaches to wildlife upon impact.CR3 3 The device functions in heavily wooded areas (2000 meters ideal. 300 meters minimal)CR4 9 The device does not impede the accuracy of the shot, or at least produces repeatable deviationsCR5 3 The device does not impede the range of the shotCR6 1 Tracker costs under $50CR7 3 Arrow attachment is reusable up to ten timesCR8 9 Arrow attachment "sticks" to wildlife with enough force to not fall offCR9 3 Tracking is active for up to 90 minutes. 30 minutes minimal.
CR10 1 The arrow attachment is one pieceCR11 1 Arm/disarm feature for arrow attachment is present.CR12 3 Used for for both deer and turkey huntingCR13 3 Durability/temperature resistance is suitable for Oct.-Dec huntingCR14 9 Arrow attachment does not fall off due to force of the shotCR15 9 User device tracks the location of the arrow attachmentCR16 3 Arrow attachment does not generate a noise when shot
Engineering Requirements
rqmt. # Importance Source Function Engr. Requirement (metric) Unit of MeasureMarginal
ValueIdeal Value
S1 3 CR3 System Functionality Transmit Range meters 300 2000S2 2 CR4, CR5 System Operation Weight grams <5.8 <2.9S3 1 CR4, CR5 System Operation Aerodynamic Drag Drag Coefficient ±25% ±10%S4 3 CR8 System Functionality Holding Force (Target) Newtons 1.12 2.24S5 2 CR14 System Functionality Holding Force (Arrow) Newtons 24 30S6 2 CR13 System Robustness Operational Temperature degrees Celsius 0 to 30 minus 30 to 50S7 3 CR4 System Functionality Change in Arrow Accuracy mm from center at 20m <50 25S8 1 CR5 System Functionality Change in Arrow Range % 10 5S9 3 CR9 System Robustness Operation Time minutes 30 90S10 2 CR7, CR10 System Robustness Product Reusability # of uses 5 10S11 3 CR1 System Functionality Accuracy of Tracking meters per meter 1 / 50 1 / 100S12 1 CR6 System Production Prototype Cost $$ 150 100S13 1 CR6 System Production Manufacturing Cost $$ 90 50S14 2 CR11 System Functionality Arm / Disarm Feature binary No YesS15 1 CR15 System Portability Handheld User Tracking Device binary No YesS16 2 CR12 System Functionality Arrow Compatibility % arrows in market 40 100S17 2 CR4, CR5 System Portability Volume of Arrow Attachment mm cubed 75 30
Requirement MappingEngineering Requirements
Tran
smit R
ange
Weigh
t
Aerodyn
amic
Drag
Holding Force
(Targe
t)
Holding Force
(Arro
w)
Operati
onal Te
mperatu
re
Change
in Arro
w Accurac
y
Change
in Arro
w Range
Operati
on Time
Product
Reusa
bility
Accura
cy of T
rack
ing
Proto
type C
ost
Man
ufacturin
g Cost
Arm /
Disarm
Featu
re
Handheld U
ser T
rack
ing Dev
ice
Arrow Compati
bility
Volum
e of
Arro
w Atta
chm
ent
Cust
omer
Nee
ds
The device locates the wildlife after being shot. X
Device detaches from arrow and attaches to wildlife upon impact. X XThe device functions in heavily wooded areas (2000 meters ideal. 300 meters minimal)
X
The device does not impede the accuracy of the shot, or at least produces repeatable deviations
X X X X
The device does not impede the range of the shot X X X X
Tracker costs under $50 X X
Arrow attachment is reusable up to ten times X
Arrow attachment "sticks" to wildlife with enough force to not fall off X
Tracking is active for up to 90 minutes. 30 minutes minimal. X
The arrow attachment is one piece X
Arm/disarm feature for arrow attachment is present. X
Used for for both deer and turkey hunting X
Durability/temperature resistance is suitable for Oct.-Dec hunting X
Arrow attachment does not fall off due to force of the shot X
User device tracks the location of the arrow attachment X
Arrow attachment does not make a noise when shot X
Cust
omer
Nee
ds
Functional DecompositionLocate Wildlife
Attach to Arrow
Access Arrow
Attach to Wildlife
Does not alter Shot
Detach from Arrow
Link to Animal
Remains attached during
Flight
Protect Functional Integrity
Safeguard Electronics
Indicate Location of Attachment
Device
Transmit Signal
Activate Transmitter
Receive Signal
Activate Receiver
Process and Interpret Signal
Morphological Analysis
Solutions
Sub-Functions
1 2 3 4 5
Attach to ArrowSpring-Dowel
PinClip Adhesive Magnet
Attach to Wildlife
Barbed Hook Pronged TipSpring-Activated
ClampRetractable
Prongs
Transmit/Receive Signal
Transponder WiMAXCell Phone
SignalRadio Waves
Indicate Location
Audio Speaker LCD MapVisual-Blinking
LEDCellphone Integration
Dial Indicator
Protect Functional Integrity
EnclosurePotting
CompoundAirbags?
Activate Transmitter
Accelerometer On/off switchAnimal Circuit
Activation
Concept Selection1 2 3 4 5
Metrics Importance Spring-Dowel Pin Clip Adhesive Magnet1 Ease of Design 2 4 2 1 32 Effectiveness 1 2 1 4 33 Cost 3 4 1 2 34 Weight 1 3 2 1 4
TOTAL 25 10 13 220.04 0.1 0.076923077 0.045454545
1 2 3 4 5Metrics Importance Barbed Hook Pronged Tip Spring-Activated Clamp Retractable Prongs
1 Ease of Design 2 1 2 4 32 Effectiveness 1 2 1 4 33 Cost 3 1 2 4 34 Weight 1 1 2 3 4
TOTAL 8 13 27 220.125 0.076923077 0.037037037 0.045454545
1 2 3 4 5Metrics Importance Transponder WiMAX Cell Phone Signal Radio Waves
1 Ease of Design 2 2 4 3 12 Effectiveness (Range) 1 3 2 5 43 Cost 2 2 5 4 14 Weight of Transmitter 1 2 4 3 15 Power Consumption 2 2 4 3 1
TOTAL 17 32 28 11
Attach to WildlifeSolution
Transmit/Receive SignalSolution
SolutionAttach to Arrow
Concept Selection
1 2 3 4 5Metrics Importance Audio Speaker LCD Map Visual-Blinking LED Cell Phone Interface Dial Indicator
1 Ease of Design 1 3 5 1 2 22 Effectiveness 1 5 1 4 1 23 Cost 2 3 5 1 1 2
TOTAL 11 11 6 4 60.090909091 0.090909091 0.166666667 0.25 0.166666667
1 2 3 4 5Metrics Importance Enclosure Potting Compound Airbags?
1 Ease of Design 2 1 2 32 Effectiveness 1 1 2 33 Cost 3 2 1 34 Weight 1 1 2 3
TOTAL 10 11 210.1 0.090909091 0.047619048
1 2 3 4 5Metrics Importance Accelerometer On/Off Switch Animal Circuit Activation Limit Switch
1 Ease of Design 2 1 1 4 32 Effectiveness 1 1 3 4 23 Cost 3 2 1 4 24 Weight 1 1 2 3 4
TOTAL 10 10 27 18
Activate TransmitterSolution
Solution
Indicate LocationSolution
Protect Functional Integrity
Concept SelectionSolution Number--> 1 2 3 4 5
Attach to Arrow 2-Clip 2-Clip 2-Clip 1-Spring-Dowel Pin 2-ClipAttach to Wildlife 1-Barbed Hook 2-Pronged Tip 1-Barbed Hook 2-Pronged Tip 1-Barbed Hook
Transmit/Receive Signal 4-Radio Waves 4-Radio Waves 1-Transponder 1-Transponder 4-Radio WavesIndicate Location 3-Blinking LED 5-Dial Indicator 3-Blinking LED 3-Blinking LED 4 - Cell Phone Interface
Protect Functional Integrity 1-Enclosure 1-Enclosure 1-Enclosure 2-Potting Compound 1-EnclosureActivate Trandmitter 1-Accelerometer 2-On/Off Switch 1-Accelerometer 2-On/Off Switch 2-On/Off Switch
Physical Architecture
RF Receiver
RX Antenna
RF Transmitter
Battery
Arrow Clip
GPS Satellites
Arrow Attachment Handheld Device
Tx Antenna
GPS Receiver
Audio Jack
GPS Receiver
Google Maps
Microcontroller
Hide Hook
Active Antenna(s)
iPhone
Google Maps Integration
Handheld Device
Receive GPS Coordinates
Display Phone
Location
Display GPS
Coordinate Location
Store Locations
on the Cloud as a
“Map”
Google MapsHandheld Device Application
Relay GPS Coordinates to Google
Maps
Sends Save Command to Google Maps
Bow Efficiency vs Arrow Weight
Example
B.W. Kooi - “On the Mechanics of the Bow and Arrow”
Baseline Drag Analysis Reference Stalker ExtreemeTemperature F 30 F
C - 1.1 CElevation Ft 100 Ft
m 0.0 mAir Pressure Pa 101325 PaRelative Humidity % 75 %Pressure H2O Pa 418 PaPressure dry air Pa 100907.2243 Padensity air kg/m^3 1.296 kg/m^3Projectile size and mass Projectile size and masscaliber cal 31 caldiameter m 0.0079375 marea m^2 4.9483E- 05 m^2mass grain 394 grainmass kg 0.0255312 kg
SD kg/m.m 405.2 kg/m.mBC 0.0641i 8.992average Cd 2.097k 1/m 0.002635 1/m
G1 ReferenceV (ft/s) V (m/s) Cd (G390) d (m/s.s) arrow d (ft/s.s) G390
10 3.04785 2.243673306 0.026180711 0.0858947220 6.0957 2.247839019 0.104917276 0.34421678540 12.1914 2.204876302 0.411648011 1.35055121965 19.811 2.249027013 1.10877441 3.63771132680 24.3828 2.162734726 1.615120898 5.298953087
100 30.4785 2.204399553 2.572243766 8.439119982130 39.6221 2.13369768 4.207667356 13.80468295150 45.7178 2.125213789 5.579649935 18.30593813200 60.957 2.108260178 9.840247144 32.28427546225 68.5767 2.1013581 12.41329035 40.72601826250 76.1963 2.018127455 14.71805485 48.28758162550 167.632 1.806890912 63.77920795 209.2493702
Video of Arrow Slow Motion
https://www.youtube.com/watch?v=CO102jz8sFM
Front of CenterInputs Value UnitsBroadhead Weight 100 GrainsBroadhead Length 1.5 inchesArrow Weight 450 GrainsArrow Length 32 inchesAttachment Placement behind Broadhead 2 inchesLow FOC 7.00%High FOC 15.00%
Center of Gravity CalculationsShaft COG 0.4064 mBroadhead COG 0.82423 mAttachment COG 0.7874 m
Optimal C.O.G. CalculationsL 0.8509 mLow COG 0.485013 mHigh COG 0.553085 m
Force CalculationsLow Broadhead contribution 0.002198 NmLow Shaft contribution 0.002292 NmHigh Broadhead contribution 0.001757 NmHigh Shaft contribution 0.004277 Nm
Minimum Attachment Weight 0.311612 gramsMaxiumum Attachment Weight 10.75592 grams
Minimum Attachment Weight 4.808904 grainsMaxiumum Attachment Weight 165.9892 grains
Optimal F.O.C values were found at Goldtip.com and ArcheryReport.com
Arrow Trajectory
Inputs for Trajectory with DragInitial Velocity 231 ft/s
70 m/sLaunch Angle (from slider) 0.000 degreebow angle 0.000Launch height (eye=0) 1 metersDrag Coefficient 1.25000 (1/m)Drag Power 1.0Projectile Mass 550 grains
0.03564 kg
CALCULATIONS FOR VELOCITYArrow Mass 0.03564 kgBow Weight 65 ft lbsEnergy 88.127 J oules
Muzzle Velocity 70.3233018 m/sMuzzle Velocity 230.719502 ft/s
Possible Designs
Arrow Flight Test
Test Procedure 10 shots fired from 20 meters of each design Velocity measure with radar gun for each shot Deviation measured from bulls-eye in mm Calculate mean, median, standard deviation…etc
Iterate Test Procedure for a normal arrow and each attachment design.
Test Data Sheet
Description Total WeightUnits - Grams accuracy(mm) velocity(m/s) accuracy(mm) velocity(m/s) accuracy(mm) velocity(m/s) accuracy(mm) velocity(m/s) accuracy(mm) velocity(m/s)
Baseline ArrowStreamline (5 grams)Streamline (11 grams)Cylinder (5 grams)Cylinder (11 grams)Oblong (5 grams)Oblong (11 grams)Taper (5 grams)Taper (11 grams)
Shot 1 Shot 2 Shot 3 Shot 4 Shot 5
Description Total Weight Average Accuracy Median Accuracy Accuracy St. Dev. Average Velocity- Grams mm mm mm m/s
Baseline ArrowStreamline (5 grams)Streamline (11 grams)Cylinder (5 grams)Cylinder (11 grams)Oblong (5 grams)Oblong (11 grams)Taper (5 grams)Taper (11 grams)
Arrow Attachment Device Electronics
GPS Receiver
Linx Technologies RXM-GPS-RM Includes evaluation kit Operating Voltage: 3.0-4.3V (Typically 3.3V) Supply Current: 12-14mA (Peak of 44mA) NMEA Output Messages Embedded Ceramic Antenna (not included)
RF Transceiver
Linx Technologies TRM-915-R250 No evaluation kit included, plan to substitute using Raspberry
Pi Operating Voltage: 3.3V Supply Current: Receive: 25mA Transmit: 60-200mA
Frequency: 902-928MHz Can transmit to distances of up to 4km
Antenna Considerations Friis Equation can be used to calculate range
Arrow attachment device may need multiple antennas Interference can be predicted using permittivity of materials
Linx’s recommendation:
Power Consumption
Arrow Attachment Electronics
DevicePower Consumption
(mW)GPS Receiver 42.9RF Transmitter 330
Total: 372.9
User Device Electronics
DevicePower Consumption
(mW)RF Receiver 25
Microcontroller 5Total: 30
𝑃=𝑉 ∗𝐼
ID Risk Item Effect CauseLikelihood
Severity
Importamce
Action to Minimize Risk Owner
1 Effect on flight of the arrowThe attachment could
cause an inaccurate shot
The aerodynamics of the arrow become
faulty3 3 9
Ensure the aerodynamics of the arrow are unaffected by the attachment
Tim/Alex
2 Range of the DeviceLocation of the animal
unknown
The animal becomes out of range of the
device3 3 9 Wireless data transmission test Eric/Joe/Frank
3Enough holding force for the
attachment to the arrow
Tracker doesn’t stay on arrow during flight or
impact
Not enough holding force to the arrow
3 3 9Test by applying a pulling force to the
attachment of the arrowTim/Alex
4Unfamiliarity with wireless
Transmitting/Receiving
Difficulties choosing the best method for signal
translation
Lack of RF/wireless transmission knowledge
3 3 9Seek help from an expert in the signals
field (ie. Dr. Amuso)Eric/Joe/Frank
5 Circuitry size constraintWeight and size of arrow
becomes too robustUnnecessary circuitry 3 3 9
Keep the circuitry small enough to fit into your palm
Eric/Joe/Frank
6Placement of mechanism
onto arrow
Cause injury/ harm to the user or effect the accuracy
of the shot
Placing the device towards the butt of the
arrow3 3 9
Avoid placing the device towards the back or mid section of the arrow
Tim/Alex
Risk Assessment A
Risk Assessment B
ID Risk Item Effect CauseLikelihood
Severity
Importance
Action to Minimize Risk Owner
7 Loss of Signal Transmission Animal becomes lost
Heavily wooded areas or obstacles blocking the
signal of the attachment to the user device
2 3 6
Explore all frequencies for which the RF components can operate on, and select the frequency which provides the most minimal
interference
Eric/Joe/Frank
8 Animal falling on top of attachment
The signals from the attachment will be seriously if not completely attenuated
The body of the animal causes a median, for
which signals cannot pass through
2 3 6 Operate in a range of frequency, which signals can pass through the deer carcass Team P14347
9 Detachability of the device
If the device doesn’t detach the attachment
could block the penetration of the shot
Faulty detachment mechanism
2 2 4Test the device on different material
surfacesTim/Alex
10 Part Lead Times Delays in the projection Procrastination 2 2 4Ensure the parts are ordered ahead of
schedule Team P14347
11 Avoiding Patent Infringement Product can’t go to marketLack of attention to detail and patents
1 2 2Be aware and research all current
restraints by patentsTeam P14347
12Durability of attachment
(Reusability)
Device is fragile and requires replacing
periodically
Weak materials and poor construction of
device2 1 2
Ensure that weak, brittle materials are a last resort
Tim/Alex
13 Budget Conservation Going over budget Poor budgeting 1 1 1 Draft and follow a strict budget Team P14347
14 Geometry of the deviceAn alarming sound, alerting the animal
Bulky geometry 1 1 1Computation model of the aerodynamic
drag of the attachmentTim/Alex
Test Plan
Bill of Materials
Action Items
Select number/type of antennasTest arrow attachment shapesDecide on form factor and dimensionsSelect batteryTest/experiment with Linx Technology products as they arrive
Complete designFull BOM & pricing of parts necessary for MSD IIOptimize budget
Project Plan for MSD II
PrototypingApplication development (for Google Maps integration)
Maintain budgetTest for engineering requirements
Questions?