Preliminary Detailed Design
All relevant documents are located here: Detailed Design Documents
Team Vision for Preliminary Detailed Design PhaseThe goal of this phase is to further analyze our concept design. During this phase, we have prototyped and simulated parts of the system. We have also come up with a bill of materials and test plans for the device.
Engineering RequirementsUpdated Engineering Requirements
The notes from the observed training can be found here
Use CasesOur use cases are unchanged from before.
Electrical SystemLinks to datasheets can be found in BOM lower down on page.
Weight measurement/Pressure, force sensorsFeasibility can be found here
Electrical SchematicCan be found here
Resource/Template for Arduino Registers
Snapshot of Events
Finite State Machine
Timing Pseudo Code/Template
Speed Pseudo Code/Template
Foot Pedal Embedded Flow Control
Emergency Shut-Off Embedded Flow Control
Mechanical SystemTreadmill CAD: here
Motor SelectionMotor Selection was aided by acquiring a treadmill and testing the treadmill for the required torque with a static 50 lbs weight applied to belt. There are two main requirements for the motor:
- Able to hit 2mph at max RPM, Using a 2 pulley system
- Provide the Required start up Torque to the belt through the pulley system
Possible DC Gearmotors:
Final two selected motors:
Analysis for MDF BoardStress and Life analysis were calculated for the current MDF board design.
- Load applied as point load in middle of board
- Homogeneous Isotropic Material
- Board can be analyzed as a Beam
Factor of Safety: Xs=17.613
Life: 1.84*1015 cycles
The Analysis can be found here
Step Length FeasibilityThe below values are preliminary pending part selection. Calculation was done to ensure that our treadmill could accommodate an average two year old. The max length of treadmill is 25".
The current max available tread length is 23".
Tension System: (picture)
PurposeThe system architecture supports our analysis and feasibility from above.
Bill of Material (BOM)Bill of Material with links to each subsystem can be found here
Test PlansTest plan live document can be found here
Risk AssessmentRisk assessment live document can be found here
Plans for next phaseStay in contact and work with Subject Matter Experts for verification.
Professor Hoople for motors and analog, our guide Professor Slack or Professor Indovina if digital or coding problems arise.
Individual PlansIndividual 5 week plans can be found in the Individual 5-Week Plans subfolder.
An overview of what we want to accomplish and when can be found here