Table of Contents
Performance vs. RequirementsRequirements P15001 meet all of the following requirements that are in green to the customer’s satisfaction.
The three yellow requirements are addressed below:
- Operate smoothly – this requirement was not perfectly met because of the software hang up which caused jarring operation every 14 steps. To address this issue, the team would order a higher power processor with more peripherals.
- Allow natural movement on stairs – the way that the team addressed this was to add a manual switch rather than using the more unpredictable distance sensing to adapt to terrain. This sacrifice for a more robust design was discussed with the customer. Terrain adaptation was proven to work in MSD I during feasibility testing.
- Adapt to different terrains – as discussed above, the adaptation was user driven.
Below is a copy of the teams engineering requirements that gives qualitative values for the system’s performance. The requirements that they relate to is listed in the source column.
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BOM & Budget TrackingOur Bill of Materials (BOM) displays the components that make up our final prototype
Bill of Materials
Our budget tracking document displays the total prototype
Circuit Board: Revision 2Below is the updated schematic and layout for the the mistakes that were made in the first revision.
System Electrical ArchitectureThe system is electrically connected as described below. The two flow charts show the same system, but two different views. The flowchart to the left shows the system as a whole with less detail whereas the right show more detail of the electrical system.
Code FlowchartThis flow chart shows the basic flow of the code that is used for the system. This shows how the switches and heelstrike work in moth active and passive mode.
Muscle DesignA McKibbon air muscle was designed to raise the foot at the appropriate times, providing the necessary force and deflection. A final Solidworks model and muscle assembly are shown below:
The two plugs for the McKibbon muscle were designed to
integrate the muscle into our final system. The plugs
were designed in Solidworks and fabricated in RIT's
machine shop. Pictures of integrated plugs, as well as
detailed drawings for machining, are shown below:
Lower Component Housing
Pictures of the Solidworks models and final Lower Component Housing Assembly are shown below:
Upper Component HousingPictures of the final Upper Component Housing assembly are shown below:
Switch Housing Design
The switch housing was designed to hold the 2 switches
and 1 LED that help satisfy our engineering requirement
of an easy to interface system. This switch holder helps
contain all 3 components in one central location, and is
attached to the AFO so it is located near the user's hip.
If our system was taken to the market, this part would be
plastic injected molded; this would allow for addition
features that our 3D printing service could not support,
including a lid to cover the switches and a lid to
protect the wires. Therefore, a complete drawing is not
included. A picture of the SolidWorks model, as well as
the final assembly, is shown below:
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Assembly and Build Plan
- Acquire new backpack and research ergonomics
- Upper Component Housing
- Begin applying for grants
- Order new distance sensor
- Remove distance sensing (concept design)
- Explore new options for pressure sensor placement
- Purchase new model of distance sensor
- Redesign lower component housing, to account for smaller distance sensor
- Look into using CO2 rather than air
- Discuss and research ergonomics of brace
- Incorporate stairs, robust design
- Address code hang-up by ordering high power processing unit and new solenoid
What could we have done better?
- Better discuss project requirements with customer and guide at start of MSDI
- Apply for subject testing at the beginning of MSDI rather than in MSDII
- Feasibility testing- integrated electrical test during MSDI. Tests for electrical component were done separately rather than together.
- Better plan for mechanical and electrical system integration during MSDI
- Better Edge/SVN training at beginning of MSDI
- Use CAD to create system design models, rather than using GAD drawings
- Record meeting notes in more efficient way. Suggestion: only type up next steps and action items and scan in hand written notes.
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