Team Vision for Subsystem-Level Design PhaseThe main items to be completed during this phase were:
- Pick-up boat
- Repair the trolling motor
- Obtain solar panels from Alfred State College
- Obtain additional sponsors
- Begin subsystem prototyping and testing proof-of-concept
We accomplished everything that we had set out to do, except for repairing the trolling motor. The trolling motor that is currently in our possession is a 30 lb thrust motor. Due to analyses conducted during this phase, we've decided to use a 45 lb thrust motor and wait to conduct any test involving the trolling motor until the 45 lb thrust motor is in our possession.
We obtained the boat, but at a later date than anticipated. This pushed back the deadline of a couple of activities, such as measuring the boat and accurately modelling the floats in CAD.
Test Plans for Engineering Requirements
Pictured (L to R): Max Kelley, Jeff Stevens (Department Chair), Andy Litzinger, Matt Haywood, Sean Kelley (Instructor)]]
The SPAAV Electrical Engineering team spent a Friday at the Alfred State College School of Applied Technology in Wellsville, NY where they gained some first hand knowledge of the implementation of Solar and Wind hybrid systems. While there, they met with subject matter experts Jeff Stevens (Electrical Construction and Maintenance Electrician, Department Chair) and Sean Kelley (Electrical Construction and Maintenance Electrician, Instructor) about the implementation of Solar as well as Wind technology in the SPAAV project.
While at Alfred state the team was able to see multiple implementations of Solar and Wind applications that are in use around the Alfred State Campus as well as tour their laboratory spaces.
Status of the Boat
- Boat is being stored at Matt Haywood's house.
- There is a hairline crack in the port pontoon, as seen in the picture on the right.
Test Plan for Small-Scale Boat
These test will help identify the hydrodynamic coefficients.
- Circle Maneuver
- Turning Radius
- Drift Angle
- Speed Loss
- Heel Angle
- Kempf’s Zig-Zag Maneuver
- Establishes important characteristics of yaw
- Response time
- Yaw overshoot
- Total period for 20° oscillations
- Establishes important characteristics of yaw response
- Pull-Out Maneuver
- Determines if the ship is straight-line stable or not.
- Dieudonne’s Spiral Maneuver
- Determines if the vessel has a memory effect, manifested as a hysteresis in yaw rate r
We revisited two questions during this phase. Changes from last phase are shown in bold.
How much thrust do we need to propel the boat forward?
We benchmarked against a project that used two 30-lb thrust motors that operated on a calm lake. We decided upon using two 45-lb thrust motors because we will be operating in a larger, less-calm body of water.
How far can we reliably communicate (TX & RX) with the boat?
Electrical Subsystem Design
A link to the Interactive Subsystem Design can be found here Electrical Subsystems Architecture
Mechanical Subsystem Design
SteeringWe created an animation of the type of steering system we want to use--Parallel Linkage Steering.
MountingWe've decided to use T-slot Aluminum for our mounting solution. It was chosen because it is easy to move components to change the weight distribution of the boat. It is also modular and can be easily mounted to the existing structure of the boat.
Small-Scale Model of SPAAVWe've decided to create a small-scale model of the boat to aid us in developing the dynamic model of the full-size boat. The model will be made from high density insulation foam for the hulls and 3D printed ABS for the steering and propulsion components.
Bill of Materials (BOM)
Link to the live document: Bill of Materials - Excel
Link to the live document: Risk Assessment - Excel
Subsystem Level Design Review
Plans for next phaseFor us, this phase will focus on further characterizing our subsystem level components
Below 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:
- Obtain 45lb trolling motor
- Obtain electrical parts for testing
- Build the small-scale boat
- Create kinematics code