P16045: Motorized Pediatric Stander for the market
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Subsystem Design

Table of Contents

Team Vision for Subsystem-Level Design Phase

The team tasked itself with diving into the P15045 stander in order to identify existing problem areas and potentially fix them prior to our MSD II design. The team also desired a better understanding of the constraints surrounding the overall motor system to ensure that any difference from the P15045 system could be supported. SMEs for microcontrollers, motor systems, and sensors were identified for needed feedback on the team's design concepts and potential solutions. Further information on the control scheme and stander use cases was needed, and meeting with Linda Brown was determined necessary.

Feasibility: Prototyping, Analysis, Simulation

Initial testing (3/12)

Stander Code

Performance Observations (3/16)

Forward Button

Further testing (3/17)

Meeting with Dr. Day about Project Scope What stander(model) will we be working with?

Are we designing to Linda's specifications or a designated child?

What happens if we decide to step up to a bigger scale product(i.e. multiple standers for multiple customers)?

Debouncing the Encoders

Path Forward

P15045 Stander Analysis

A working copy of the action log being used to document all things done to the stander can be found here.

Stander Reaction Timing Chart Data

Stander Reaction Timing Chart Data

Stander Reaction Timing Chart

Stander Reaction Timing Chart

Drawings, Schematics, Flow Charts, etc.

Current Stander Design

Current Stander Design

Current Stander Design

Design Changes:

Systems Architecture

Systems Architecture Overview

Systems Architecture Overview

Software Flowchart of Main System Loop

Software Flowchart of Main System Loop

Software Flowchart of Process Following Button Press

Software Flowchart of Process Following Button Press

Software Flowchart of Process Following Environmental Disturbance

Software Flowchart of Process Following Environmental Disturbance

Software Flowchart of Process Following Received Bluetooth Command

Software Flowchart of Process Following Received Bluetooth Command

Enclosure

The design criteria and selection for microcontrollers can be seen in the Microcontroller Selection Diagram.

Pro/Con Analysis of Simblee After developing software flowchart and performing analysis of available micro-controllers, there was one - The Simblee - that stood out due to some unique features. A specific Pro/Con Analysis can be found here in the Simblee Pro/Con Analysis.

Wheel System

Calculations

Governing Equations, Assumptions, and Nomenclature

Governing Equations, Assumptions, and Nomenclature

Free-Body Diagram of Single Drive Wheel

Free-Body Diagram of Single Drive Wheel

Torque and RPM Requirements

Torque and RPM Requirements

Wheel System Configurations

Current Motor Specifications and Other Motors

Current Motor Specifications and Other Motors

Motor Specifications Continued

Motor Specifications Continued

The live document with the motor analysis and configuration set-ups can be found here.

Finding Candidates for Test Trial

P16045 has decided to include two candidates to participate in our test trial of our motor kit. There will be multiple phases to this.

Phase 1: Compile information of candidates that are interested in participating in the test trial.

Phase 2: Contact possible candidates that best fit the criteria of the trial. The conversation will help both parties understand what is expected from each other and to get on the same page.

Click Here for the Form

SME Notes

Notes from Meeting with Linda Brown

Risk Assessment

Subsystem Level Design Risk Analysis Chart

Subsystem Level Design Risk Analysis Chart

Please refer to the current risk analysis chart for the live document, and to see the overall changes in risk identified from the problem definition design review to the subsystem level design review.

Key Changes in Risk Analysis Chart

Plans for next phase

MSD I Timeline

Project Plan

Individual 3-Week Plans

Individual Plan: Jenna Hopkins

Individual Plan: Max De Sousa

Individual Plan: Jack DeGonzaque

Individual Plan: Holman Chung

Individual Plan: Run Qui


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