Preliminary Detailed Design
Team Vision for Preliminary Detailed Design Phase
The objectives for the Preliminary Detailed Design Phase were to continue improving the feasibility analyses in order to show reasoning for the selection of prototype materials and components. During the extended feasibility analyses, the team's engineering background was found helpful for design calculations.
The team began this phase presenting individual phase plans in which each member then became responsible for.
The final product for this phase shows the continued research and calculations done by each member. During this phase, some important components of the prototype were determined including the proper oxygen tank and battery. The team also discussed and agreed on splitting the prototype into two components. The backpack will be utilized for helping carry heavier components that don't need to be within the incubator structure and the incubator which will be held in front of the user which will carry the infant and heater along with other smaller components Prototype build also began during this phase in which Jen made the first prototype of the backpack. This will be used in testing before MSD II in order to give time for any modifications that may need to be done for user comfort.
Prototyping, Engineering Analysis, Simulation
The first backpack prototype pattern was determined by the team and modified by Jen Russo in order to fit everything needed. Jen also made this first prototype. The team will use this in order to do user analysis tests and them modify where needed depending on the feedback. Images of the process can be seen below as well as the completed product.
Feasibility: Prototyping, Analysis, Simulation
OxygenA live document of the excel spreadsheet used in calculations can be found here.
HumidityA live document of the excel spreadsheet used in calculations can be found here.
Heat TransferA live document of the excel spreadsheet used in calculations can be found here.
Drawings, Schematics, Flow Charts, Simulations
Schematic of System
Bill of Material (BOM)
The Bill of Materials document was created by Jen Russo who will be the contact for any purchasing. The team has agreed to have one person manage purchasing to keep everything organized as well as stay on budget. Jen has also created a purchasing document in which team members will fill out and submit in order for her to have documentation of the order.
The purchasing document can be seen below. This document allows for Jen to have multiple options to order the part from when purchasing as well as long term in order to keep the websites on record. A working file can be found here.
An image of the BOM can also be seen below and the working file can be found here.
The team has continued to develop test plans for new risks that have arised during the Preliminary Detailed Design Phase as well as give more detailed plans for the tests determined last phase.
The tests that the team has created preliminary plans for are as follows:
- Battery length and bypass circuit
- Total weight
- Temperature sensors (both for infant and incubator)
- Structural Integrity
- Oxygen Flow
- User Analysis
A test plan document can be found here. This document includes the test, instruments, and basic testing procedure that will be used and modified as needed when testing occurs. The image below is an example of the battery testing tab that can be seen in the document. Each test listed above has its own tab.
The User Analysis write up in order to test on human subjects can be found here. Necessary actions have been taken by the document owner, Ashley Pitters.
Design and Flowcharts
The overall design of the incubator was developed through Customer Requirements as well as various drawings and team discussions. A general shape was created fro the incubator in order to allow for a 15 degree and 30 degree angle of the base. This was determined during interviews with doctors during the Honduras trip as medical terms call certain angles fowler and semifowler.
The backpack CAD model is also still in preliminary stages, but was created in order for the team to determine whether or not the selected parts would fit within it since they have not been ordered yet. The backpack design is that of a bx at the moment, but the pattern has already been determined as seen above.
Snapshots of the CAD model assemblies can be seen below. The document owner of all CAD models is Victoria Tripp.
PurposeThe Failure Mode Effects Analysis (FMEA) allows for an in depth evaluation of any potential risks during the use of the product. When evaluating risks, a cause and effect are assigned in order to determine the root of the issue and define countermeasures to lower the potential occurrence.
Updated Assessment OverviewThe document owner is Victoria Tripp.
The updated risk assessment document can be found here.
Design Review Materials
Design Review Presentation for the problem definition review can be found here
Plans for next phase
Individual Detailed Design Phase plans can be found here.