P17047: The Overcomer - Upper Extremity
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Systems Design

Table of Contents

All documents for the Systems Design Phase can be found here

Team Vision for System-Level Design Phase

Goals for Phase 2

Develop and build 3 physical and diverging concept solutions that could resolve our problem statement.

What did we accomplish?

Functional Decomposition

Purpose

  1. Define the total list of functions and subfunctions, based on the Customer and Engineering Requirements, that must be delivered by the final design
  2. Establishes the need for specific concepts necessary to deliver the overall objectives of the project

Functional Decomposition

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Inputs and Source

  1. Project Objectives
  2. Engineering Requirements
  3. Benchmarking Data

Outputs and Destination

  1. Complete list of functions that must be provided in order to satisfy the functional requirements of the entire project
  2. Engineering Requirements are written to measure how well the functions are performed
  3. Initial concepts are generated around functions

Benchmarking

Purpose

  1. Avoid redundant work by identifying already available solutions and concept options
  2. Help determine feasibility of generated concepts
  3. Compare manufacturing, consumer price, etc.

Benchmarking

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Functional Benchmarking Excel Sheet

Inputs and Source

  1. PRP
  2. Project Objective
  3. Function Decomposition
  4. Prior MSD EDGE sites
  5. Customers
  6. Vendors and users of existing or similar solutions
  7. Literature search
  8. Friends and associates

Output and Destination

  1. List of best available concepts
  2. Criteria used for selection of best concepts

Concept Development

Purpose

  1. Generate new concept options or combinations that can potentially exceed the benchmark concepts
  2. Brainstorm at least 50 ideas of how to address each function from functional decomposition

Initial Concept Sketches

NOTE: for those who have access to the team google drive please look under Concept Design > Round 0 / Round 1 / Round 2 to access entire collection of sketches
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Input and Source

  1. Function Decomposition
  2. Results of Benchmarking
  3. Analysis and prototyping

Outputs and Destination

  1. List of multiple viable concept options to provide each function
  2. Continued concept refinement process

Morphological Chart and Concept Selection

Purpose

  1. Develop multiple concept options to deliver the required list of functions
  2. Ensure that concepts are available to deliver every required function
  3. Select the optimal set of concepts that can be integrated to meet the project objectives

Morphological Chart

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Selection Criteria

  1. Ease of integration to mobility device*
  2. Manufacturing cost^
  3. Weight
  4. Ease of use*
  5. User satisfaction rate*^
  6. Adaptable size to user
  7. Ease of storage
  8. Practical for MSD time frame*
  9. Concept can securely hold equipment
  10. Attachment time
  11. Complexity of design*
  12. User Independence (can operate without assistance)*
  13. User Safety interacting with attachment*

Pugh Chart

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Pro's and Con's

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Inputs and Source

  1. Project Objectives
  2. Engineering Requirements
  3. Function Decomposition
  4. Initial Concept Development
  5. Benchmarking criteria

Outputs and Destination

  1. A complete set of concepts that provide all of the functionality required
  2. Fall back options to substitute for the most risky concepts

Final Concepts

Lever Attachment Overview

Net Catch Overview

Pinball Striker Overview

Spring Cannon/Funnel Overview

Lever Attachment

Net Catch

Pinball Striker

Spring Cannon/Funnel

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Systems Architecture

Purpose

  1. Ensure flow of energy, info, material and structural forces as intended
  2. Define subsystem functions and interfaces

Function Tree

Lever Attachment

Lever Attachment

Net Catch

Net Catch

Pinball Striker

Pinball Striker

Spring Cannon/Funnel

Spring Cannon/Funnel

Subsystem Interfaces

Lever Attachment

Device Holder/ Upper Assembly

Lazy susan bearing

Device base/lower assembly

Attachment Device

Net Catch

Attachment Device/Rail

Rail/ Vertical bar loop

Handle bar

Net handle

Pinball Striker

Wing subsystem:

Attachment subsystem:

Arm subsystem:

Spring Cannon/Funnel

Attachment subsystem:

Funnel Subsystem

Cannon Subsystem

Lever Subsystem

Aiming Subsystem

Bill of Materials

Lever Attachment

Lever Attachment

Net Catch

Net Catch

Pinball Striker

Pinball Striker

Spring Cannon/Funnel

Spring Cannon/Funnel

System Constraints

Lever Attachment

Net Catch

Pinball Striker

Spring Cannon/Funnel

Inputs and Source

  1. Engineering Requirements
  2. Functional Decomposition
  3. Concept Development and Selection

Outputs and Destination

  1. High level description of the total system that support concept selection
  2. Interface definition for subsystem design
  3. Bill of Materials needed for each system

Feasibility: Prototyping, Analysis, Simulation

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 concepts with quantitative information

Mathematical Analysis

Lever Attachment

Lever Attachment

Net Catch

Net Catch

Pinball Striker

Pinball Striker

Spring Cannon/Funnel

Spring Cannon/Funnel

Mockups

Lever Attachment

Lever Attachment

Net Catch

Net Catch

Pinball Striker

Pinball Striker

Spring Cannon/Funnel

Spring Cannon/Funnel

Inputs and Source

  1. Engineering Requirements
  2. Concept Selection
  3. Bill of Materials
  4. Benchmarking and research

Outputs and Destination

  1. A list of Design Parameters, Quantified Targets, and acceptable tolerances
  2. Concept Selection
  3. Concept Refinement

Updated Risk Assessment

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Updated Risk Assessment

Design Review Materials

Plans for next phase

Pert Chart

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Team Goals

Individual Contributions

Hannah

Robert

Amy

Liz

Jamie

Emma


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