Subsystem Build & Test
Table of Contents
Team Vision for Subsystem Level Build & Test PhaseCompleted this phase
- Lung fabrication, preliminary test
- Stand is partially constructed, painted
- Assemble ABS rib components
- Assemble Ninjaxfex ligaments
- Redesigned rib movement mechanism, materials ordered and received, ready to be implemented
- Ordered material for backup lungs
- Redesigned the chest cavity and diaphragm
Below is the image of the updated plan tracking.
The full document can be found here.
Test Results Summary
Initial construction for the lungs began during this phase. The rubber was cut after tracing the stencil. The two pieces were glued together to create a pair. The lungs were glued at the bottom so that the lung could be flipped before the top portion was sealed. After allowing for a 24 hour drying period, the lung was filled with water and the unsealed portion was checked for leakage. The test was successful.
Risk and Problem Tracking
Many of the risks have been eliminated or lessened at the closure of this phase. The updated risks can be found here.
Below is a picture of the updated problem tracking.
The residual volume is to be maintained via the use of microfiller beads. The 300mL required in each lung was measured out with a beaker and poured into the sandwich bags as pictured below.
The image below is of Jade gluing the bottom of the lung together. The lung stencil was traced onto the rubber and cut out. The bottom was sealed so that a drying period could take place before flipping.
StandThe stand has a base with dimensions of 1 ft by 1 ft. The legs measure 11 inches in height. Screws were utilized to attach the legs to the base. At this time, the top of the stand was not machined because the diaphragm has not been printed. The construction was able to be completed because of the mechanical engineering machine shop (big thanks!).
RibsThe ribs have been printed.
Chest CavityA new design for the chest cavity was designed. The new design allows for the spine to easily fit. A smaller model was printed and thermoforming was tested.
Plans for Next PhaseMeaghan:
- Once diaphragm is printed, work with Jade to cut hole in top of base, assemble rest of stand, paint top of stand
- Test lungs for leakage
- Add microfiller beads to lungs
- Once model is constructed, add rib movement system with Jade
- Start technical paper
- Assemble stand
- Start technical paper
- Install rib movement mechanism
- Test susbystems
- Cut acrylic plate for the base with a handle and try Ninjaflex seal or * rubber hair-tie seal
- Determine bonding material for seal to withstand shear from piston movement
- Modify taper in chest cavity to improve thermoform
- Test full-size printed diaphragm to validate life cycles (currently 200 cycles - loading+unloading)
- Test acrylic base with seal
- Test pressure values obtained
- Permanent rib attachment
- Print ninjaflex seal
- Print abs plate and handle to attach to ninjaflex seal
- Full size thermoforming mold
- Modify completed spine to attach in a stable manner to the chest cavity