P17025: Portable Toddler Treadmill
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Preliminary Detailed Design

Table of Contents

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

Treadmill Block Diagram

Treadmill Block Diagram

Engineering Requirements

Updated Engineering Requirements
Updated Engineering Requirements

Updated Engineering Requirements

The notes from the observed training can be found here

Use Cases

Our use cases are unchanged from before.
Use Cases

Use Cases

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

Arduino Data Structures

Arduino Data Structures

Resource/Template for Arduino Registers

Arduino Data Structures

Arduino Data Structures

Snapshot of Events

Arduino Data Structures

Arduino Data Structures

Finite State Machine

Brief Finite State Machine

Brief Finite State Machine

Timing Pseudo Code/Template

Timing Pseudo Code

Timing Pseudo Code

Speed Pseudo Code/Template

Speed Pseudo Code

Speed Pseudo Code

Foot Pedal Embedded Flow Control

Foot Pedal Flow Control

Foot Pedal Flow Control

Emergency Shut-Off Embedded Flow Control

Emergency-Shut Off Flow Control

Emergency-Shut Off Flow Control

Mechanical System

Treadmill CAD:
Current Design

Current Design

Internal View

Internal View

Tensioning sub-system

Tensioning sub-system

Frame sub-system with Tensioning Brackets

Frame sub-system with Tensioning Brackets

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:
System Requirements

System Requirements

Schematic of Motor and Belt Pulleys

Schematic of Motor and Belt Pulleys

Possible DC Gearmotors:

DC GearMotors

DC GearMotors

Final two selected motors:

Final 2 Motors

Final 2 Motors

Analysis for MDF Board

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

Important Assumptions:

MDF_FBD

MDF_FBD

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".
Step Length Feasibility Calculations

Step Length Feasibility Calculations

The current max available tread length is 23".

Step Length Feasibility Calculations

Step Length Feasibility Calculations

ASTM Standards:

ASTM Standards

ASTM Standards

Tension System: (picture)

Purpose

The system architecture supports our analysis and feasibility from above.
System Architecture

System Architecture

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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