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Discuss the design, include pictures from CAD, explain design decisions, things that did/didn't work, things we learned/how we would want to change things for the future. dicsuss design, data intended to be collected, discuss what was never finished, problems we anticipated like temperature, vibration.

  • Possible ice pack stuff
    • Need something that can stay above 3 or 4 celsius - can we just put an ice pack in the fridge instead of freezer so that it doesn’t get too cold.
    • option 1
    • option 2
    • There are many others similar to the ones above. Another option would be getting an ice bag and filling it with cold water. It might just be hard to find one that is small enough to fit and that we trust the seal on  
  • Electronics Plan
  • Raspberry Pi 3A+ Dimensions:

Dimensions in inches: 2.20 x 2.56 x 0.33 in

Battery Holder Dimensions: 2.5 x 3.42 x 0.9in

Total dimensions for CAD box: 3.43 x 2.56 x 3.69 (all 3 setups together)

Cylinder Height: 8.75in with lids

Total box height: 11.686in

Space for electronics: 3.81 x 3.81 x 2.936 in

Total dimensions of 1 setup: 2.5 x 3.42 x 1.23 in

If all three sideways: 0.12 inches left

Two flat one on side next to it: need to determine true height for fit

  • Need to figure out how much space each setup will need above it to not overheat

1/28/24

  • Raspberry Pi

1/24/24

  • ORing
    • 233
    • Lid Diameter - C: 3.122
    • Groove Diameter - B-1: 2.903
    • Groove Width - G: 0.1895

1/14/24

  • Arduino Nano Accelerometer Tutorial
  • L-brackets

12/10/23

  • Find new battery because of spaceport rules

12/09/23

  • Hydrostatic testing for cylinder
  • Need to make testing cap with hole in top - in slack
  • O-rings
    • Change groove diameter to 6.525, make groove width 0.093


12/06/23

Vibration Damping Material/Insulation: Silicon Foam Gel Pad

12/03/23

https://formlabs.com/store/materials/?Material+Family=5454 

Swati:

  • Finished dxf of outer box 
  • Worked on the cost breakdown
  • Updated masses for components
  • Updated cost breakdown

Battery Details

11/26/23

Potentially Include more Eyeballs + Finish up Camera Mount

  • Camera mount in progress - I have the general structure designed but the dimensions are still tbd + also need to figure out sizing for screws in the mount
  • Could potentially include up to 4 eyeballs but would need to redesign eyeball holders 
    • Include some extra material along the vertical side of the cylinder that each of the eyes are mounted to (to include a sort of buffer so that we don’t have to penetrate the actual cylinder and create pressurization issues)
    • We may only need 1 circuit board for up to 4 cameras (which would mitigate our FOV issue)
    • Eyeball holder general ideas:
  • We have a basic CAD idea for the eyeball holder for 4 eyeballs. Only question is how we will keep the eyeballs oriented correctly during flight
    • CAD is in google drive
  • Thoughts on using a more flexible material near the eye to allow for more movement?

Raspberry Pi 3 wide dimensions:

11/19/23

To Do:

  • Buying eyeballs + finding a place to work
  • Design electronic connections
  • ReCAD lids with attachment mechanisms
  • Make a decision about how to manufacture outer box 
  • CAD camera and circuit board mounts
  • Add new eyeball holder cad to assembly
  • Start making drawings
  • Documentation
  • Redo masses
  • Decide on all materials and make a list for ordering things

Electronics Info:

Attaching outer box lid:

  • Have to decide is we will be able to do a solid box, or if we will need to modify the design to make it easier to manufacture - how much do we care about two layers of containment?
  • If solid box: we can have the lid extend down into the box a bit and screw in from the sides to attach the lid
  • I don’t think we’d be able attach it with screws through the top of the lid into the edge of the box because the box will be very thin.

Cubesat Frame:

  • Could we get thin sheets of aluminum and then weld or attach together in some other way?

Attaching inner box lid:

  • I don’t think we can do Mickey’s idea from PDR because the rod would probably have to go all the way through the cylinder to work which doesn’t fit with the design inside the container - unless he means rod that goes through the outer and inner lid somehow which wouldn’t be in the way of the eyeball?
  • We can lengthen the inner part of the lid before the o-ring seal and screw into that from the outside - I can try to CAD this later. 

LED Light Placement

  • small LED bulbs option
  • Other option is LED strip lights which would be able to stick onto the sides of the container but might be harder to interface with the raspberry pi software

Camera Mount

  • Potential options:
    • Mount camera onto a piece of aluminum, fiberglass, or 3D printed material that is in the shape of a semicircle (but smaller). We can epoxy it onto the side of the cylinder (we don’t want to screw into the side) and then the camera can screw? Into the piece of aluminium/fiberglass/3D printed thing
  • Circuit Board:
    • Can be placed horizontally in the middle of the cylinder in a similar way to the camera (3D printed piece epoxied to the sides that circuit board is attached to).
    • If placing horizontally does not work because of size issues, we can redesign mounting setup to fit vertically.

Integration Plan for Launch:

  • Store in cooler before integration
  • Remove nose cone and parachute + slide in box attached to lower bulkhead + screw lower bulkhead into mission package tube
  • Put in upper bulkhead + screw into mission package tube. (do we want it to also screw into box or just sit on top?)

Cubesat Frame

  • Potential manufacturer (?) - https://thermoprene.com/need-a-quote/ 
  • Actual cubesat frames are very expensive - will either have to get on manufactured, do it ourselves, or use 80/20 type materials to create a non-solid frame

LED Light Postion/Holder:

  • LED strip lights that attach to the side on the cylinder?

Multiple Eyeballs?:

  • Where will circuit board go if we do two eyeballs?
  • How would we fit more than 2 eyeballs in the cylinder and still be able to see them within the camera’s frame of view?

Camera Mount

  • Circuit boards have 4 holes in each corner - could be mounted using standoffs and washers
  • Is there something we could include inside the cylinder that the standoffs could attach to so that we wouldn’t have to drill holes in the cylinder?

Raspberry Pi 5 Sizing

Thermal Conductiveness of Insulating Materials

  • Would we need to calculate how much vibration and thermal energy is transferred to the insulating materials first and then proceed from there?

11/05/2023

  • Sunday: O-ring - need someone from solid prop to help
  • Sunday: Pressurized payload module design developed
  • Separate the lid into circle and square 
  • (plug with groove and o-ring for easier manufacturing)
  • (after getting eyeball holder) 
  • make an assembly
  • Recalculate that our field of view is good
  • FEA
  • PDR to-do
  • 3D print eyeball holder - Marcos
  • Post-PDR to-do
  • Integrate 80-20 into the box
  • Add holes to the bottom of the rectangle lid 

FOV Calculations

Masses:

  • Bulkhead: 0.52lbs
  • Cylinder + Box: 2.28lb
  • Inner Lid: 0.31lb
  • Outer Lid: 0.09lb
  • Eyeball: 0.066lb
  • Eyeball Holder: 0.08lb
  • Camera: 0.0088lb
  • Electronics: 0.22lb (only 0.11 for circuit board - added extra for whatever other electronics we need)

11/02/2023

Completed

  • Add a holder rectangle for camera
  • Add a holder sphere for eyeball

10/29/2023

  • Make our box interface with 80 20
  • Pressure Vessel Thickness Calculations
  • Compled Risks and Mitigations list and Failure Modes Analysis
  • Completed Research damping materials
  • PDR Slide To Do:
  • Questions:
  • Is there a place to pressure test at MIT? – Yes! (maybe not needed, but we can talk to solid prop for assistance)
  • How do 80 20s work

10/22/2023





Velez, G., Tsang, S. H., Tsai, Y.-T., Hsu, C.-W., Gore, A., Abdelhakim, A. H., Mahajan, M., Silverman, R. H., Sparrow, J. R., Bassuk, A. G., & Mahajan, V. B. (2017). Gene therapy restores Mfrp and corrects axial eye length. Scientific Reports, 7(1). https://doi.org/10.1038/s41598-017-16275-8

  • Lighting
  • What existing research is there about the effects of spaceflight on human eyeballs (primarily during ascent, not microgravity)?


  • Very little research on ascent – hence why this is interesting!
  • Expected that this is determined by elastic properties of the optic nerve (and maybe eye) which would be affected if the eyeballs are squished launch and landing – https://pure.rug.nl/ws/portalfiles/portal/133399769/1_s2.0_S0142961219308397_main.pdf
  • Closest we get is this: (Tl; dr: they started measuring 21 minutes after weightlessness still on flight but not during the initial time period of launch itself)


In 1994 a Russian publication provided evidence of ICP measurements during shortduration spaceflight in a Macaque monkey named Krosh on the biosatellite Cosmos-2229 (Krotov et al. 1994). A surgically implanted pressure sensor was placed in contact with the dura mater 25-30 days before launch. ICP was measured during seven 5-minute sessions throughout the 20 hours before launch, continuously for 2 hours starting 21 minutes after entering weightlessness, and then for 5 minutes every 2 hours throughout the duration of the flight. Before launch, while in the rocket on the launch pad, ICP in the “physical mid-position” (head and legs at the same level) averaged 10.23 ± 0.12 mmHg (range: 8.5 – 12.1 mmHg). During the final 2 hours before flight the average ICP was 11.66 ± 0.09 mmHg. Twenty-two minutes after entering weightlessness ICP was 13.78 mmHg and continued to increase to ~15 mmHg over the first few hours. By flight days 3 to 5 ICP reached an average of 14 mmHg, driven in large part by increased ICP during the night. Conversely, from flight days 6 to 9 ICP was higher during the day than at night and the average ICP returned to values that were similar to preflight baseline. Disruption in the sleep-wake cycle throughout the mission led to the changes in the circadian pressure rhythm such that ICP was higher at night than during the day on flight day 8 and 9. The ICP pulse also demonstrated changes during weightlessness, with a decrease in amplitude of the arterial component and an increase in amplitude of the venous component. This also tended to return toward preflight morphology during flight days 5 to 9. In comparison to the 4 mmHg change in ICP observed from preflight to weightlessness, posture changes on Earth (moving the monkey from upright to supine) increased ICP by 10 mmHg.

Source: https://humanresearchroadmap.nasa.gov/Evidence/reports/SANS.pdf

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