Below you will find the logistics and engineering insight into the revolutionary design of the Una Crutch.
To understand the mind of a crutch user and gain feedback, different Una Crutch prototypes were manufactured.
The Following Designs were created in the RIT Industrial Design Studio.
Handles/ Pads prototypes, Handgrip and Axillary Prototypes.
User Feedback and Testing Results can be found at the following link, Initial Prototype Testing Results.
Different Manufacturing Methods were explored at the following link, Manufacturing Processes
Engineering Analysis: Prototyping Phase
For our initial prototype designs, analysis was preformed to determine if it is feasable. In addition, the following analysis below was used in final design analysis for the Una Crutch.
Buckling Analysis, Buckling
Analysis for Magnetic Connective Mechanisms, Magentic Connective Mechanism Analysis
Spring Analysis, Spring Analysis
Stress Analysis, Handle Stress AnalysisClamp Analysis, Clamp Analysis
Engineering Analysis: Frame/Body Final Design
Detailed Buckling, Buckling
Axilla Crutch Calculator, Cantilevered Handle Analysis, Pin Life Analysis, and Deflection Analysis, Una Crutch Engineering Analysis
Wobble Analysis: This analysis was made to determine whether the crutch would wobble once the user places there load on the crutch axilla pad. The results in the document show a minimal wobble of 0.57 inches. Thus the system will not wobble significantly, analysis found at the following link, Wobble Analysis.
Stress Analysis, Fatigue Analysis, and Material Specifications, System Stresses.
Miminal gap clearances are observed in the Una Crutch with one no larger then 0.66 in. All Gap Clearances between all critical parts can be found at this link, Clearances
Dynamics analysis can be found at the following link, Dynamics.
Engineering Analysis: Connection Mechanism
Connection Mechanism, Una Crutch Engineering Analysis
Una Crutch Finite Element Analysis
- Analysis preformed in either Solidworks Simulation or ANSYS.
All FEA Results with Loads and Constraints can be found by clicking Here.
Shaft, Base Connection, Connection Mechanism Eng Results results found Here
Please note that in most cases the load applied is 300 lbs and each case has its own unique boundary coundtions.
Spotlight on Base Connection:
Detailed FEA Reports can be found at the appropiate links below.
Una Crutch CAD Files
- Please note that there are two Flat Single Crutch and Base Connection Assemblys. The reason for this is in the next stage 3D Printing the base connection must be made as two pieces or it cannot be made. For full production assemblys, a single piece will be injection molded. The prototype examples are shown on all drawings.
To view CAD work, Please click here. All CAD is located in the NA Folder, CAD.
Schematics can be found here, Schematics.
Una Crutch CAD DrawingsA drawing packing for the Una Crutch can be found below.
Una Crutch Final DesignsBelow are our final designs for the Una Crutch.
Bill of Material (BOM)A detailed list of the parts that will be purchased to create the Una Crutch are listed below.
As you can see, the Una Crutch is projected to be under budget, but is close enough to budget to ensure a sucessful cost analysis.BOM
Did we meet the Engineering Requirements?Below are our original engineering requirements. As you can see, P14042 has met the Engineering Requirements. Some will be verified in testing, but we can say that we have designed a crutch that can hold a 300 lb person and allow the user to go from two to one crutch.
Test PlansTest Plan.
Risk AssessmentThe current up to date Risk Assessment is below.
Both the current and previous version of the Risk Assessment is available below by clicking the following link Risk Management
Axilla Crutch Una Crutch Connection Add-on
Engineering Analysis, Axilla Add-On Engineering.
CAD, located in the NAlite folder, CAD.
MSD II PlanAs always, our full and detailed Project Plan for MSD II can be found at this link, MSD II Project Plan. NOTE: This is a Microsoft Project File; Download Accordingly!
Snapshot of the plan is below.
Design Reviews12/5/13- Detailed Design Review PPT, Detailed Design Review.
10/29/13- Subsystems Design Review Powerpoint, Subsystems Design Review.