Preliminary Detailed Design
Team Vision for Preliminary Detailed Design PhaseDuring the Preliminary Detailed Design Phase the Angles ARC team:
- Iterated interior layout options to pick a final layout
- Changed incubators based on a price comparison
- Determined possible materials for interior flooring, and seating
- Conceptualized ideas for incubator securements
- Developed test plans for the Neopuff modification
Initial Exterior DesignsBefore the October trip to Honduras the preferred design was:
This design used a Ford F-450 with an exterior box attached to the chassis. However, after the trip to Honduras that idea was abandoned for this:
The change is because of the availability of the vehicles in Honduras and changed customer requirements. The original design (F-450) did not allow for the driver to talk to the passengers in the back area of the vehicle. This was originally accepted because the original use scenario did not include a medical professional in the back of the vehicle, so no communication was needed. However, upon return from Honduras new information was supplied which indicates a medical professional will be travelling with the infant and wishes to talk to the driver. Additionally, Ford is not a common vehicle manufacturer in Honduras and is hard to repair and purchase. Toyota is very common in Honduras, and as a result is easily repaired and maintained.
Therefore, a Toyota Land Cruiser was selected in the changed design which is commonly found in Honduras (current ambulance is Land Cruiser). This change in vehicle also allows for communication between the driver and passengers in the back of the vehicle.
Initial Interior DesignsOnce the Toyota Land Cruiser was chosen, different interior designs were constructed to incorporate all necessary requirements and equipment:
Interior Concept 1
Interior Concept 2
Interior Concept 3
The dimensions of the incubators were based off of the AirBorne Voyager Transport Incubator as that was the incubator of chose after Benchmarking and Pugh Analysis. Interior dimensions were based off of the Toyota Land Cruiser 70 series. However, after further analysis the incubator was changed to the International Biomedical 185A+ due mostly to cost restrictions.
Prototyping, Engineering Analysis, SimulationSpatial Analysis was performed through computer design programs to determine proof of concept and the best layout option in the limited space.
Iteration one of the design from the chosen schematic was created as a proof of concept. This included 2 incubators of the dimensions from the newly chosen International Biomedical 185A+ incubator, a paramedic seat, 2 overhead cabinets and an additional chair for the family of the neonate to sit.
Problems: From our initial design it was realized that the chair would interfere with the cabinets and must be placed elsewhere in the ambulance for comfort and usability.
Iteration two solved some of the problems associated with the first iteration of the space model. The cabinets were moved above one of the incubators, monitor storage was added as was a window between the driver and the driver cabin and the ambulance portion. The chair for the family member of the neonate has also been modified to have under seat storage of nonessential equipment.
Problems: Although the equipment fits in the space there is limited head room and storage space for medical and infant equipment.
Iteration three took everything from iteration 1 and 2 into account to create a more spacious and realistic floor plan. The height of the vehicle was raised by 60 inches to allow for proper head space when moving around the back of the vehicle. Like iteration two this version includes 2 incubators, a paramedic chair, a seat for family with storage, monitors and the window between the two sections. In addition more cabinetry was added above the second incubator.
Problems: This design solved all of the problems from iterations 1 and 2. There is more height for comfort as well as proper and more flexible storage.
Design iteration CAD models done by Charlee Lefkovich
Final Interior Layout
From all iterations and discussions the final interior layout was decided upon. The height of the ambulance compartment has been raised to 60 inches, there is overhead storage above one of the incubators,and a place for patient monitors. Additionally, the paramedic seat is on a track and has rotational and folding abilities for versatility and storage when not in use. The seating for the family member will have storage underneath for materials not often needed during transit but that should be included in the ambulance (cleaning supplies, backup equipment, etc.)
Problems: As of now in the design process there are no known issues with this final interior layout although further analysis is still being completed to secure this design. An analysis of weight distribution must still be done to ensure that by adding equipment (monitors) and storage overhead the vehicle will not become too top heavy and increase the chance of the vehicle tipping over. Additionally, the monitor stand design is still continues to change, and further iterations will most likely be needed to determine the best orientation and load distribution on a stand.
Final Interior Layout model done by Alexa Boyd
Drawings, Schematics, Flow Charts, Simulations
Detailed Drawing of Interior Layout SubsystemsFamily seat with storage
- 3 point harness for passenger securements
- Custom Made
- Full seat back for comfort and safety
- Under-seat storage
Model done by Charlee Lefkovich and research done by Alexa Boyd
Paramedic Jump Seat
- 3 point harness for passenger securements
- Incremental rotation for incubator access but includes a series of stops so rotation does not continue from vehicle movement
- Track in floor for sliding
- Seat folds up (vertically) to open floor space
Benchmarking of pre-made seat done by Rebecca Bonamico, interior design considerations done by Alexa Boyd
Image and inspiration for design from:http://evsltd.com/products/1769_mobility1.html. This specific pre-made chair cannot be used as the track will take up too much space, and the height of the chair when placed on the track greatly reduces head room. However, I similar system will be used but will have a smaller profile to save space in a limited size environment.
Overhead Storage Design
- Slides on a track for easy removable to be cleaned easily
- Magnetic doors to allow for easy access but contain all equipment during travel
Design and research done by Alexa Boyd
- 100,000 or more double rubs (durability testing)
- Soil and Stain Resistant
- Easily cleanable or bleach cleanable
- Moisture barrier
- Material Considered: Vinyl
- Vinyl composition Flooring, or LVT
- Easily cleanable
- Material Considered: Vinyl Composition Tile with Enhanced Surface Traction
- Easily cleanable
- Cost effective to manufacture
- Material Considered: Molded Acrylic or 3D printed material
Bill of Material (BOM)
Owner of BOM for future updates are Charlee Lefkovich and Rebecca Bonamico
Test PlansTest plans are currently being developed primarily by Austin Zuercher as to Neopuff modification testing, stress analysis for custom designs and securements.
Gage Ellis is working to develop a system to test the power configuration.
Design and Flowcharts
Power InfrastructureAll Power calculations, flowcharts, schematics done by Gage Ellis
Risk AssessmentHere is a look at the highest risks associated with the ambulance:
You can see our full risk assessment and analysis Here
This document is updated regularly to reflected new changes and the risks associated with those changes. The most up to date version is 13Nov2017.
Risk Assessment Documentation Updated by Rebecca Bonamico
Design Review Materials
You can view our Preliminary Detailed Design Review Presentation Here.
Presentation assembled by Charlee Lefkovich with contributions from all members of the team
Plans for Next Phase
- As a team we will continue to iterate new design layouts, consider new alternatives for equipment to save space and money. Begin to design and analyze the CPAP modification if approved, create a chair design, complete 3D models and the bill of materials.
- Austin - Continue to develop test plans for Neopuff modification, and iterate designs on the incubator securements.
- Alexa - Research interior design details, materials, space considerations, keep the customer in mind.
- Ankha - Create more detailed CAD designs, as well as a small scale mock up to visually see the design layout.
- Charlee - Continue to update documentation, provide input to engineering decisions when needed, additional CAD designs if needed.
- Gage - All things power! Find a program to help model power schematics better, continue looking into calculations and what is needed.
- Rebecca - Keep risk assessment, and BOM updated, provide input to engineering decisions, follow up with contacts if needed.
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