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ECE791: ORAL PROPOSALMEASURE OF OAR BEND TO QUANTIFY
ROWING EFFICIENCY
Jonathan DwyerKenneth WeigelEric Donovan
Project Advisor: Wayne Smith PhD.Presentation Date: 10/27/2011
General Issues
No objective method of determining rowing efficiency
No simple, objective method of comparing rowing effectiveness between rowers
All methods of boat selection rely on subjective determinations of speed
Introduction: Basic Oar Anatomy
Oar Blade: The “paddle-face” of the oar. Oar Shaft: The long, cylindrical
midsection of the oar. Oar Collar: The portion of the oar that
sits within “Oar Lock.” Fulcrum. Oar Lock: Portion of rigger that fixes oar
to the rigger. Rigger: Attaches the boat and the Oar
Lock.
Oar Anatomy - Picture
Basic Rowing Technique – The Catch
“The Catch”: The blade’s placement into the water, ideally enters at the speed of the water.
Basic Rowing Technique – The Drive
“The Drive”: Portion of stroke with most power application. This is where the peak bend rating will occur.
Basic Rowing Technique – The Release
“The Release” – Blade pressure lessens, oar shaft straightens, blade pushes back on water, causing air pocket to form allowing for easy blade extraction.
Oar Bend - Picture
Basic Rowing Technique - Video
Design Objectives
Use a strain gauge to measure bend of the oar during execution of stroke
Program microcontroller to store and manipulate bend readings
Store values on external memory, transmit to cable-connected iPod (real time), display on LCD (real time)
Program to allow after-the-fact performance analysis
Block Diagram
Final Proposed Implementation
Start/Stop Timed “pieces” functionality (i.e.
stationary bike) LCD displays strokes per minute, average
bend rating, time remaining/elapsed, most recent bend rating (rating of previous stroke)
iPod shows LCD’s information in real time to coxswain
On-pc program will display graphs and data tables allowing for post-practice analysis
Project Impact
Coach can view data of multiple rowers from multiple pieces to determine work ethic, efficiency, power
Allows for objective comparison between athletes (avg. rating vs. avg. rating)
Coxwains can evaluate rowers based on data, allowing for more relevant feedback
Plan
Strain gauge epoxied onto oar shaft Wire connects gauge output to integrated circuit
for voltage scaling, amplification, and noise reduction
Integrated circuit feeds into microcontroller Microcontroller connects in serial to LCD for
display Microcontroller output connects via adapter to iPod Microcontroller output connects to external
memory via USB port External memory will connect back to home
computer for post-workout efficiency analysis
Relevant College Coursework
ECE541, ECE548, ECE617, ECE618, ECE651 – analog circuit design
ECE562, ECE583, ECE649 – microprocessor design and implementation
PHYS407, PHYS408 – basic mechanics analysis
ECE633, ECE634, ECE714, ECE757 – filter design and communications systems
CS415, CS416, CS515, CS516 – object orientated programming, software design
Potential Issues
Difficult-to-analyze voltage readings Bend gauge durability Interfacing iPod to Arduino
microcontroller Determining scaling circuit amplification
parameters Storage of values onto external memory Operational efficiency (memory) Open source technology can cause
unexpected problems (not to “industry grade”)
Proposed Budget
1 Arduino Mega 2560 = $58.95 1 Phi-2 Interactive Shield Kit (Display) = $29.95 1 iOS Developer Program License = $99.00 5 Inventables Bend Sensor = $64.75 1 Gorilla Glue 8 fl. Oz All-Purpose Adhesive = $10.97 1 Redpark Serial Cable for iOS w/ P4 Serial Adapter =
$66.00 1 Used Sweep Oar, Blade Design Irrelevant = $50.00 1 Wire Lead Package = $10.00 1 DB9 M/F Null Modem Adapter = $09.99 1 VDip1 Adapter = $35.00 1 USB Key (“flip drive”) = $20.00 Power Supply = $05.00 Total Cost = $459.61
Project Implementation Schedule
Questions?