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Preliminary Detailed Design

Table of Contents 1 Team Vision for Preliminary Detailed Design Phase 2 Block Diagram 3 Engineering Requirements 4 Use Cases 5 Electrical System 5.1 Weight measurement/Pressure, force sensors 5.2 Electrical Schematic 5.3 Data structures 5.4 Resource/Template for Arduino Registers 5.5 Snapshot of Events 5.6 Finite State Machine 5.7 Timing Pseudo Code/Template 5.8 Speed Pseudo Code/Template 5.9 Foot Pedal Embedded Flow Control 5.10 Emergency Shut-Off Embedded Flow Control 6 Mechanical System 6.1 Motor Selection 6.2 Analysis for MDF Board 6.3 Step Length Feasibility 6.4 Tension System: (picture) 6.4.1 Purpose 7 Bill of Material (BOM) 8 Test Plans 9 Risk Assessment 10 Plans for next phase 10.1 Electrical 10.2 Mechanical 10.3 Individual Plans

All relevant documents are located here: Detailed Design Documents

Team Vision for Preliminary Detailed Design Phase

The 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.

Block Diagram

Engineering Requirements

Updated Engineering Requirements

The notes from the observed training can be found here

Use Cases

Our use cases are unchanged from before.

Electrical System

Links to datasheets can be found in BOM lower down on page.

Weight measurement/Pressure, force sensors

Feasibility can be found here

Electrical Schematic

Can be found here

Data structures

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 System

Treadmill CAD: Drawings can be found here

Motor Selection

Motor 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 Board

Stress and Life analysis were calculated for the current MDF board design.

Important Assumptions:

• 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 Feasibility

The 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".

ASTM Standards:

Tension System: (picture)

Purpose

The 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 Plans

Test plan live document can be found here

Risk Assessment

Risk assessment live document can be found here

Plans for next phase

Stay in contact and work with Subject Matter Experts for verification.

Electrical

Professor Hoople for motors and analog, our guide Professor Slack or Professor Indovina if digital or coding problems arise.

Mechanical

Professor Boedo

Individual Plans

Individual 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

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