Preliminary Detailed Design
Team Vision for Preliminary Detailed Design PhaseThe main items to be completed during this phase were:
- Obtain 45lb trolling motor
- Obtain electrical parts for testing
- Build the small-scale boat
- Create kinematics code
We've obtained a MinnKota C2 45 Endura Freshwater Transom-Mount Trolling Motor. A test was run on the trolling motor to see if the Pololu High-Power Motor Driver (Model 18v25CS) could handle the current. Additionally, this test setup would allow for the Hall effect sensors to be prototyped and their feasibility for angular velocity measurement verified. Finally, the PWM frequency would be varied to study the effects on motor performance.
We’ve also obtained a water level sensor which will allow us to begin prototyping the analog circuitry necessary to detect water in the hulls.
The small-scale boat structure is completed but the steering/propulsion components and the controller still has to be mounted and developed.
We’re found a kinematics code that we will use as guide to develop our own.
Prototyping, Engineering Analysis, Simulation
Small-Scale Model Boat
Updated Top-Level Architecture
Trolling Motor Test
Scope Capture and Test DataThe trolling motor was tested using a Pololu 18V25CS Motor Driver utilizing PWM from a function generator, in order to characterize the motor power consumption versus angular velocity. The PWM frequency was varied from 500Hz up to 40kHz, and the duty cycle of the applied PWM signal was varied from 20% to 80%. Motor current consumption and angular velocity were recorded in Trolling Motor PWM Frequency and Duty Cycle.
Bill of Material (BOM)
Link to the live document: Bill of Materials - Excel
Test Plans for Small-Scale BoatTests include:
- straight line maneuver
- circle maneuver
- zig-zag maneuver
- spiral maneuver
Link to the live document: Risk Assessment - Excel
Preliminary Detailed Design ReviewPreliminary Detailed Design Review Presentation
Plans for next phaseBelow is a screenshot of our project schedule that focuses on the upcoming weeks.
A link to the live project schedule can be found here Project Schedule - MS Project file
In summary, the key items for our team to accomplish this portion are:
- Creating electrical schematics in Eagle
- Fixing the crack on the hull
- Designing and mounting structure & steering system
- Finishing the assembly of small-scale boat
- Performing model boat tests