Table of Contents

This phase requires an overall basic design of the entire project. Here all the subsystems detailed more than the previous phase and they are all combined for the entire system. All the intricacies and final design will be completed in the next phase but mostly done in this one.
Team Vision for Preliminary Detailed Design Phase
Goals Purchase pieces for prototype designs: Magnets, DC Motor, Beaglebone
 Create preliminary propeller case designs
 Begin coding
 Assembly of the entire system
 Update risks and Engineering Requirements
 Update BOM
 Drawings of designs
 Electrical designs, procedures, and diagrams
 Flow charts updated
Accomplishments
 All the goals set in the team vision were accomplished and even more than expected was completed. Several key components were broken down and detailed, materials were purchased, and contacts were made.
Prototyping, Engineering Analysis, Simulation
Prototyping
Purchased Pieces
 Magnets
 Enclosure for magnets
 Microcontroller
 3D printers on campus are available for creating propeller and enclosure
 Choosing the propeller design was based off of the Pugh chart for the propeller and the DC motor that was purchased. Below is the chart describing the best choices.
Engineering Analysis
Propeller Efficiency Calculations These calculations describe the performance of the propeller
 Involves the fluid bulk elasticity modulus, thrust, power, and velocity
 Equations displayed below
 eff: Propeller Efficiency
 K: Fluid bulk elasticity modulus
 F: Thrust
 vo: Vehicle velocity
 P: Power
 Below is a spreadsheet filled with propeller efficiency calculations. It should be noted efficiency is directly related to the disk diameter and exit diameter. If the ratios are the same between two calculations, they will have the same efficiency. Propeller efficiency is essential to understand how well the propeller will perform under different conditions.
Propulsive Efficiency Calculations
 These calculations describe the propulsive performance of the propeller
 Involves area, density, velocity, and thrust
 Equations displayed below
 Eta: Propulsive Efficiency
 A: Propeller disk area
 F: Thrust
 vo: Vehicle velocity
 Rho: Density
 Below is a spreadsheet filled with the propulsive efficiency of the propeller calculations. It should be noted efficiency is directly related to the disk diameter and exit diameter. If the ratios are the same between two calculations, they will have the same efficiency. This was calculated to discover how efficient the propulsion of different sized propellers would work.
Rotational Velocity Equations
 These calculations describe the speed at which the propeller spins
 Involves number of revolutions and diameter
 Equations displayed below
 vr: Rotational velocity
 D: Diameter of propeller
 N: Number of revolutions
 Below is a spreadsheet filled with the rotational velocity of the propeller at different RPM values, which were also converted revolutions per second. The rotational velocity was found to discover how fast the propeller would spin at specific sizes.
Relative Rotation Efficiency
 These calculations describe the performance of the rotational properties of the propeller
 Involves behind the hull efficiency and open water efficiency
 Equations displayed below
 Eta_o: Open water efficiency
 F: Thrust
 vo: Vehicle velocity
 vr: Rotational velocity
 Qo: Torque at open water test
 Q: Torque
 Eta_B: Behind hull efficiency
 Eta_R: Relative rotation efficiency
 Below is a spreadsheet filled with the relative rotation efficiency of the propeller. Along with behind the hull efficiency and the open water efficiency. It includes calculations of several equations. Some values were estimated due to research and because some values would be found through actual testing. The purpose of this calculation was to show if the rotational velocity was efficient for this type of propeller's conditions.
Hull Efficiency
 These calculations describe the efficiency of an entire vehicle if using one of our propeller designs
 Involves effective horsepower and the work done by the propeller thrust
 Equations displayed below
 EHP: Effective horsepower
 Rt: Hull resistance
 vo: Vehicle velocity
 va: Propeller speed
 w: Wake
 Eta_H: Hull efficiency
 Below is a spreadsheet filled with the hull efficiency of the system if one our propeller designs would be used. It includes calculations of several equations. Some values were estimated due to research and because some values would be found through actual testing. The purpose of this calculation was to show if the boat/vehicle would operate well with this type of propeller.
 The file for all the calculations can be found here.
 Note: These calculations were created to show what types of efficiencies would occur in different propeller sizes and can be used for scaling. Our design wasn't based off the answers that appeared in these calculations. Our design for the propeller design was based off the size of the DC motor that was ordered, so that it could fit perfectly into it.
 Blacked out cells on the excel spreadsheets are to notify the reader that the value is constant for the specific variable; therefore it would be unnecessary to keep repeating the value for each cell.
 Note: The values for the propeller design are highlighted by yellow.
Drawings, Schematics, Flow Charts, Simulations
Mechanical System Design
Preliminary AssemblyPropeller with Inner Magnets and Shaft
Motor
Mechanical System Parts Design
Preliminary Propeller Designs Solidworks Model of the 5 Bladed Propeller
 Solidworks Model of the 3 Bladed Propeller
 Solidworks Model of the 4 Bladed Propeller
 Solidworks Model of the Inverted Propeller
 Solidworks Sheet of the 5 Bladed Propeller
 Solidworks Sheet of the 3 Bladed Propeller
 Solidworks Sheet of the 4 Bladed Propeller
 Solidworks Sheet of the Inverted Propeller
Enclosure Designs
Solenoid Design
Drawings
Enclosure Design DrawingParts List
 DC motor
 Propeller
 Solenoid
 Rare Earth magnets (various sizes and shapes)
 Electromagnets
 Enclosure for propeller
 Enclosure for entire system
 Microcontroller (Beaglebone)
 Powerboards
Flow Chart
Solenoid Controller Schematic
Actual Board Design
Wiring Diagram
Bill of Material (BOM)
 Motor Construction
 Purchase motor
 “Off the shelf” design
 $800  $1,200
 Purchase motor
 PCB Purchase and Construction/Assembly
 New Budget
 $4,000 of allocated spending
 Funds spent to date: $128.99
 BeagleBone Black Development Board
 $61.16 (w/ tax)
 Misc. magnets for proof of concept
 BeagleBone Black Development Board
Test Plans
Subsystem
 Magnets: Stabilization (lateral, axial) of the magnets and the entire system, preventing the system from falling apart. This will also include a mock build.
 Propeller: Flow simulation in SolidWorks will allow us to understand how the water or air will flow through the propeller and in what areas it will be disrupted or experience turbulence.
 Motor: Use an encoder to measure RPM; hook up and see if it the motor spins.
 Solenoids: Helmholtz coils will show if power runs through the solenoid.
 Enclosure: A leakage test will show if the propeller is enclosed properly & see if the motor fits.
 Coding: Check values, troubleshoot, and emulate the program to see if any errors occur or if the code runs.
 Temperature: Use thermocouples to see get temperature values.
 Solenoid Controller: Verifying proper voltage output via multimeter, based on different inputs.
 Power Supply: Verifying the proper voltage is being output.
 Note: At this moment the test plans for the entire system as one have not been entirely planned. Therefore the full plan with both subsystem and the entire system plans will be complete in the Detailed Design page.
 The test plans seem to cover all Engineering Requirements, but due to the overall system plans not being completed at this moment it's not necessarily prepared to account for leakage and the backup safe mode.
Engineering Requirements Document
Risk Assessment
Design Review Materials
Plans for next phase
Home  Planning & Execution  Imagine RIT
Problem Definition  Systems Design  Subsystem Design  Preliminary Detailed Design  Detailed Design
Build & Test Prep  Subsystem Build & Test  Integrated System Build & Test  Integrated System Build & Test with Customer Demo  Customer Handoff & Final Project Documentation