P17047: The Overcomer - Upper Extremity
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Preliminary Detailed Design

Table of Contents

All documents for the Systems Design Phase can be found here

Team Vision for Preliminary Detailed Design Phase

Goals for Phase 3

Generate a final system concept and generate a preliminary feasibility analysis and system breakdown.

  1. finalized project objective statement
  2. single concept selected to move forward with
  3. update of engineering requirements
  4. organize team documentation
  5. determine appropriate method of attachment to wheelchair
  6. completed CAD model of system
  7. detailed CAD drawing for system
  8. system CAD rendering
  9. system CAD simulation
  10. BOM for system
  11. feasibility analysis on stress of components in system
  12. feasibility analysis of energy stored in system
  13. feasibility analysis of materials
  14. physical mockup
  15. ergonomic analysis
  16. projected testing plan
  17. risk assessment update

What did we accomplish?

  1. finalized project objective statement
  2. two concepts selected to move forward with
  3. update of engineering requirements
  4. organize team documentation
  5. determine appropriate method of attachment to wheelchair
  6. semi-completed CAD models
  7. system CAD renderings
  8. draft BOM's
  9. feasibility analysis of energy stored in system
  10. physical mockup of "lever attachment" concept
  11. projected test plan for phase 4 created
  12. branding a new logo for customer
  13. system architecture breakdowns
  14. purchasing parts for mockups
  15. risk assessment update

Updated Problem Definition

Design a wheelchair attachment that provides user independence when throwing, catching, and striking an object.

Final Concept Selection

Selection Criteria

  1. Have to meet functions: throw, catch, strike, attach
  2. Ease of Integration into mobility device
  3. Ease of Use
  4. User Independence
  5. FEASIBILITY

Refinement

public/Photo Gallery/Net Catch.jpg Likes
  • handle in front of user for easy reach
  • handle allows user to use both arms
  • adjustable net
  • adjustable positioning
  • little to no profile outside the wheelchair
  • user interaction
Dislikes
  • rail in front of user
  • “cage-like”
  • in the front of a user
  • how will the net be supported while throwing?
  • ISO standards
  • metal rails
  • weight
public/Photo Gallery/Pinball Striker.jpg

Likes

  • net can be strike or catch
  • not in front of user
  • has more control over movement of device
  • user interaction
  • has large striking area
  • both sides of wheelchair

Dislikes

  • not feasible
  • too close to the wheels
  • functionally dependent on user reaction time
  • ISO standards
  • limited function/sports
  • both sides of wheelchair (more attachments)
  • strong enough to throw an object?
public/Photo Gallery/Lever Attachment.jpg

Likes

  • attaches on front of wheelchair arm
  • incorporates all three
  • versatile
  • accommodates most levels
  • can incorporate other concepts
  • ISO standards
  • minimal profile outside the wheelchair
  • user interaction

Dislikes

  • need fast reaction time
  • not feasible as designed
  • higher level user
  • repositioning of lever may be required
public/Photo Gallery/Spring Cannon.jpg

Likes

  • lever mechanism
  • can be adapted to be more ergonomic
  • minimal profile outside the wheelchair
  • user interaction
  • possible shooting range depending on how far the spring is pulled back
  • stores power

Dislikes

  • not large catching range unless user can move it
  • requires user strength to pull back
  • spring mechanism
  • is there enough space to pull a level on a wheelchair

Updated Engineering Requirements

Redefining scope
Previous:
  • Object diameter: 0.0889 [m]
  • Object mass: 0.198 [kg]
  • Horizontal angle thrown: -45° - +45°
  • Distance object struck: 1.524 - 9.144 [m]
  • Number of mobility aids: 75%
Current:
  • Object diameter: 0.1542 [m]
  • Object mass: 0.068 [kg]
  • Horizontal angle thrown: -30° - +30°
  • Distance object struck: 3.048 - 9.144 [m]
  • Number of mobility aids: current students of Joe’s using wheelchairs

Updated Engineering Requirements

CAD System Model for "Launch and Catch"

public/Photo Gallery/ab.jpg public/Photo Gallery/b.jpg public/Photo Gallery/c.jpg
public/Photo Gallery/j.jpg public/Photo Gallery/e.jpg public/Photo Gallery/fg.jpg
public/Photo Gallery/g.jpg public/Photo Gallery/h.jpg public/Photo Gallery/i.jpg

Feasibility Analysis for "Launch and Catch"

Net Component

Proposed: 2.0mm Premium High Density Poly Twine

Proposed Attachment Method

Looks Sporty!

public/Photo Gallery/net.jpg public/Photo Gallery/clip.jpg

Projectile Motion/Energy Storage

Feasibility Analysis

Purpose

  1. Confirm that the selected concepts can deliver functionality defined by the System Architecture.
  2. Define the optimal values of the most sensitive design parameters.
  3. Support the evaluation of our team's concepts with quantitative information.
  4. Make decisions about design drivers.

Inputs and Source

  1. Engineering Requirements
  2. Final Concept Selection
  3. Results of preliminary prototyping, analysis, and simulation

Outputs and Destination

  1. A list of Design Parameters, Quantified Targets, and acceptable tolerances
  2. Refined Concept Selection
  3. Material selection
  4. Manufacturing and Purchasing direction

CAD System Model for "Lever Attachment"

public/Photo Gallery/q1.jpg public/Photo Gallery/q2.jpg public/Photo Gallery/q3.jpg
public/Photo Gallery/q6.jpg public/Photo Gallery/q7.jpg public/Photo Gallery/q88.jpg
public/Photo Gallery/q9.jpg public/Photo Gallery/q10.jpg public/Photo Gallery/q4.jpg

Feasibility Analysis for "Lever Attachment"

Calculations

Projectile Motion

Feasibility Analysis

Momentum

Feasibility Analysis

Gear Analysis

Feasibility Analysis

Ergonomic Analysis

public/Photo Gallery/ergo.jpg public/Photo Gallery/sketch1.jpg

Purpose

  1. Confirm that the selected concepts can deliver functionality defined by the System Architecture.
  2. Define the optimal values of the most sensitive design parameters.
  3. Support the evaluation of our team's concepts with quantitative information.
  4. Make decisions about design drivers.

Inputs and Source

  1. Engineering Requirements
  2. Final Concept Selection
  3. Results of preliminary prototyping, analysis, and simulation

Outputs and Destination

  1. A list of Design Parameters, Quantified Targets, and acceptable tolerances
  2. Refined Concept Selection
  3. Material selection
  4. Manufacturing and Purchasing direction
  5. reference websites

Attachment Selection

Benchmarking

public/Photo Gallery/attachment1.jpg
  • 360-degree-rotation-cycling-bicycle-mount-holder
  • $1.69
  • plastic
public/Photo Gallery/attachment2.jpg
  • Quick-Fist-Clamp-mounting-equipment
  • $10.95
  • rubber

CAD Models

public/Photo Gallery/c1.jpg public/Photo Gallery/c2.jpg public/Photo Gallery/c3.jpg
public/Photo Gallery/c4.jpg public/Photo Gallery/c5.jpg public/Photo Gallery/c6.jpg

Drawings, Schematics, Flow Charts, Simulations

Purpose

Define instructions that will enable fabrication of the elements required to build and operate the entire system.

System Architecture "Lever Attachment"

Modified System Architecture

Full System Architecture

Input and Source

  1. Selected Concepts
  2. Feasibility Models
  3. System design and interface definitions

Output and Destination

  1. Complete hierarchy of design files from system level down to components
  2. Parts list
  3. Test plans, including expected performance vs. requirement and any applicable test standards

Bill of Materials (BOM)

Purpose

Confirm that all expenses and contingencies are afforded by the project financial allocation.

Lever Attachment

Bill of Materials

Bill of Materials

Purchasing

Items Purchased

Items Purchased

Test Plans

Purpose

Prototype Testing

  1. Attachment time of chosen attachment “clips”
  2. Mini Quick Fist®
  3. Team designed rail “clip”
  4. Team members performing different physical activities from the wheelchair
  5. Attachment adjustability range (height, distance from wheelchair)

User Testing

Lever Attachment
  1. Use of different striking apparatus to make sure ball is hit within range
  2. Difficulty of activity
  3. Striking of different balls (size, material, weight)

Cannon/Net

  1. Most effective device angle
  2. Difficulty of activity
  3. Catching and launching of different balls (size, material, weight)

Updated Risk Assessment

public/Photo Gallery/Risk 3.jpg

Updated Risk Assessment

Design Review Materials

Plans for next phase

Pert Chart

public/Photo Gallery/PERT.jpg

Gantt Chart

public/Photo Gallery/Gantt.jpg

Team Goals

Individual Contributions

Hannah

Robert

Amy

Liz

Emma

Jamie


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