P19046: The Overcomer
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Preliminary Detailed Design

Table of Contents

Team Vision for Preliminary Detailed Design Phase

Goals Accomplishments Future Tasks
  • CAD models for 3 catching devices
  • CAD model for catching device
  • Analysis of the models
  • 70-80% completed BOM for models
  • 70-80% completed build & test plan
  • Revaluated risk analysis
  • All goals were accomplished in this phase
  • Also develop team initiated metrics of quality for phase IV
  • Final concept selection by the customer
  • Final design of the product
  • Further developed build and test plans
  • Plan for MSD II

Updated Project Objective

Create a wheelchair attachment that provides user independence when throwing and catching.

Updated Items from Phase II

Updated Systems Architecture

Updated Systems Architecture

The updated Systems Architecture document can be found here
Bell Curve of Scope

Bell Curve of Scope

The updated bell curve of scope document can be found here

Changed Engineering Requirements Phase 3

Updated Customer & Engineering Requirements

Updated Customer & Engineering Requirements

The updated Customer and Engineering Requirements documents can be found here
Updated Concept Selection

Updated Concept Selection

The updated Concept Selection document can be found here

Critical Parameters

Critical Parameters are those requirements which are crucial to the design. These parameters ensure that we are fulfilling the Customer and Engineering requirements in a feasible way.

Benchmarking of Old Overcomer

Old Overcomer Catch/Throw Design

Old Overcomer Catch/Throw Design

Pros of Old Catch/Throw Device Cons of Old Catch/Throw Device
  • The device is smaller than the proposed design
  • Only one component for catching and throwing
  • Aesthetically pleasing with the colors
  • Easy attachment
  • Created a new frame for specific device
  • Requires a lot of force for the user to use
  • Requires user to use more than one hand to throw the ball
  • There isn't a way to dissipate the energy throughout the system, the ball can fall/bounce out easily
  • Device sitting in front of users face promotes risk
  • Cannot throw more than a few feet
  • Manufacturing process not easily repeatable
Old Overcomer Striking Design

Old Overcomer Striking Design

Pros of Old Striking Device Cons of Old Striking Device
  • Works really well
  • Can interchange the device on the end, making it versatile
  • Can work as a stand alone device or attachment to a frame
  • Created a new frame for specific device
  • A lot of parts of 3D printed, making it hard to replicate
  • Hard to manufacture
  • Intricate gear box with not much room for modifications
  • No hard stop plates, the bat can swing all the way around
  • Only launches how fast the user can control it, no spring incorporated

Catching Module Design

The images below show how the throwing and catching systems will interact. Picture not to scale, only for design concept.

Proposed Net Design

Proposed Net Design

Proposed Transfer System

Proposed Transfer System

Net Specifications

Net Description

Catching Device Parameters

Net Parameters

Net Parameters

Empirical Analysis

public/Photo Gallery/EA1.jpg

public/Photo Gallery/EA2.jpg

public/Photo Gallery/EA3.jpg

Test 1: A 0.15 meter diameter ball and a net with a diameter of 2.5 meters with a relatively loose connection on the top, extremely loose as ball passed through net.

Conclusion: The brim diameter was too high and the net needed to be more taught as the ball passed through the net

Test 2: A net with a diameter of 2.0 meters with a relatively loose connection on the top, a taught bottom of the net, but net remained loose throughout that path.

Conclusion: The brim diameter was still higher than it needed to be. Net was too loose until the bottom/taught part, the path needed to be more defined.

Test 3: Determined that the optimal diameter of brim was 1.5 meters. The more taught at the upper most hoop, increases in taught-ness as ball travels through the net with 2 levels of rings provides stable path for ball (tightest one towards the bottom).

Conclusion: The brim diameter is at the optimal level and the taught-ness of the hoop is in sync with the engineering requirements.

Projectile Energy Calculations

Net Calculations

Net Calculations

Benchmarking Attachment Methods

To attach the catching device to the frame

To attach the catching device to the frame

To attach the net to the hoops

To attach the net to the hoops

Throwing Module Design

Detailed CAD Design

Launch Mechanism

Launch Mechanism

Open Launch Mechanism

Open Launch Mechanism

Striking Device With Lacrosse Stick

Striking Device With Lacrosse Stick

Striking Device With One-way Bearing Launcher

Striking Device With One-way Bearing Launcher

Launch Diagram

Launch Diagram

Launch Calculations

Launch Calculations

Force Analysis

Force Analysis

Cam Design

Proposed Cam Design

Proposed Cam Design

Cam Analysis

Cam Analysis

Bill of Material (BOM)

Catching Subsystem Preliminary BOM
Preliminary Catching BOM

Preliminary Catching BOM

Preliminary Launching BOM 1

Preliminary Launching BOM 1

Preliminary Launching BOM 2

Preliminary Launching BOM 2

The preliminary Bill of Materials document can be found here.

Test Plans

Test Plan Screenshot

Test Plan Screenshot

Risk Assessment

Phase III Risk Assessment

Phase III Risk Assessment

Phase III Risk Curve

Phase III Risk Curve

A live version of the teams risk assessment can be found here.

Efficiency Tracking/ Individual Contributions

Phase III Action Log with Efficiency Tracking

Phase III Action Log with Efficiency Tracking

Plans to Improve Efficiency:

Design Review Materials

Include links to:

Plans for next phase

Phase IV Project Plan

Phase IV Project Plan

PRT Diagram Outlining Key Drivers

PRT Diagram Outlining Key Drivers


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