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MAE 435 Fall 2013. CubeSat Deorbit Device Final Report. 435 Team Members. Sahil Dhali Christopher Quarles Michael Foch Brockton Baskette Kyle Wade Cian Branco Advisor: Dr. Robert Ash, P.E. Introduction. Space debris are a serious hazard to continued Space exploration

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435 team members
435 Team Members

SahilDhali Christopher Quarles

Michael Foch Brockton BasketteKyle Wade Cian Branco Advisor: Dr. Robert Ash, P.E.

  • Space debris are a serious hazard to continued Space exploration
  • Dead CubeSats are hard to track
  • De-Orbit Device Project aimed at Prototype for 1U CubeSats
  • De-orbit Device Project is multidepartment effort between the Mechanical and Electrical Engineering Departments
  • MAE 435 Group’s goal to build the prototype
benzoic acid
Benzoic Acid
  • Sublimation at room temperature
inflation requirements
Inflation Requirements
  • Sounding Rocket Altitude: 160kms.
  • Pressure for sublimation@160kms: 1.42*10-6
  • Temperature for sublimation@160kms: -41’C
  • Unknown leak in large vacuum chamber
  • Extensive man hours spent troubleshooting and brainstorming solutions
  • Ultimately had to resort to using small vacuum chamber
small chamber cont
Small Chamber Cont.
  • The small chamber reaches minimum pressure around 3 minutes
preliminary heating element
Preliminary Heating Element
  • Design required to fit inside small chamber at minimal cost
  • Prototype: Steel wire wound around itself in the shape of a Fermat’s Spiral.
  • Operates on 4 AA batteries.
preliminary heating element cont
Preliminary Heating Element Cont.
  • The element can achieve temperatures between 60’C to 85’C
  • The spiral grill was designed to create a flat surface area with as much contact with the plate holding the benzoic acid.
pros cons
  • Materials readily available
  • Inexpensive
  • Easy to modify design
  • Difficult to control heat output
  • Power runs out quickly
  • Requires Direct Contact
new heating element e cigarette
New Heating Element: E-Cigarette
  • Default temperature:65-80 ‘C
  • Potentially can go up to 180’C with appropriate voltage.
  • Made of 4 major parts:
    • The LED light cover
    • The lithium battery
    • The Atomizer (heating element)
    • The mouth piece
our e cig heating element
Our E-Cig Heating Element
  • Fig 1 shows the mouth of the piece where the airbrake would be attached with the epoxy.
  • Fig 2 shows the top view of the heating element. The benzoic acid crystal would be secured on the screen over the heating coil.
  • Fig 3 shows the battery pack we used to perform the experiment. It attches to the bottom of the element and powers to heat the coil visible in fig.2.

Fig 1

Fig 3

Fig 2

pros cons of using e cig atomiser
Pros/Cons of Using E-Cig Atomiser
  • Extremely light weight; usually Al alloy;…..

Weight Constraint: Check

  • Safe and easy to use and store;…..

Storing and lasting Constraint: Check

  • Power efficient; Works on a 3.1V – 6.7V to achieve max heating capabilities;…..

Power Constraint: Check

  • Size is significantly smaller than previous design, but needs to be more compact…..

Space Constraint: Not Check

  • Bowl on which acid to be secured cannot hold all the acid required for complete deployment…..

Container Volume Constraint: Not Check

conclusion heating element
Conclusion: Heating Element
  • Meets our temperature requirements, which was our main concern.
  • The on board lithium battery should be enough to power our heater.
  • This device is powered by a button which has to be manually pressed
  • Now all that is needed for the heating element is a bigger bowl to store the complete amount of the acid, securing it in the mylar.
final steps
Final Steps
  • Design remote activation for heating element
  • Fit all the parts together for one final test before launch.
odu satellite ground station
ODU Satellite Ground Station
  • Operates mission specific transceivers, antennas, transmission lines, amplifiers and digital signal processing.
  • Intended to communicate with orbiting weather satellites and amateur radios to obtain earth images and current prevailing weather conditions.
  • Designed to receive data from NOAA weather satellites.
  • OUR PURPOSE: Use the SGS to keep constant communication with our CubeSat to obtain its position coordinates and signal to deploy the airbrake on command.
balloon airbrake
Balloon Airbrake
  • Material - Aluminized Mylar for its strength and reflectivity. (DuPont Films)
  • Target Cross-sectional area – 1 m2
  • The inflation medium will be benzoic acid.
  • Benzoic Acid Pressure
    • Pmin > 0.1813 Pa (greater than environment @ 90 km)
  • Partial Pressure of Air
    • Ambient air in balloon is to be removed to prevent premature inflation
  • Benzoic Acid Placement
    • Must absorb enough heat from heating element to reach sublimation
mylar inflatable status
Mylar Inflatable Status
  • New material from (Coated Product Sales) was ideal for sealing.
  • Rectangular Cross-Section (Pillow shape) was used.
  • Cross-sectional area may need to be reduced due to chamber volume.
benzoic acid storage
Benzoic Acid Storage
  • Benzoic acid stored in a washer with a screen.
  • Epoxied (cold welded) to inflatable.
  • Located on the inner surface of balloon.
inflatable prep
Inflatable Prep
  • Vacuum Seal-Off Fitting – OerlikonLeybold product
    • Predesigned to seal off during vacuuming, solid heat conduction, low weight and small profile
    • Vacuum seal-off fitting was press-fit into the bottom of chamber
    • Balloon will be epoxy sealed to the fitting
inflatable prep1
Inflatable Prep
  • During removal of ambient air, the material was sucked into the valve exhaust creating a seal.
  • Did not allow for all ambient air to be evacuated.
  • Solutions included folding the balloon before pumping, a pump with a throttle and/or collapsible stent.
balloon chamber
Balloon Chamber
  • Provides a pressurized zone to house the balloon.
  • Contains a valve mounted in the bottom surface.
    • Current prototype does not account for camera mounting
chamber testing
Chamber Testing
  • Single layer of Kapton failed.
  • Punctured by sharp corners of chamber cap
more testing
More Testing
  • 5 mil Mylar holds pressure with 2 gaskets
  • There are multiple points of deformation in membrane
remaining challenges
Remaining Challenges
  • Mounting doors on pins
  • Locking mechanism to keep the doors closed
  • Prototype in current state reduces chance for waste
  • Overall Goal to pass working prototype to current 434 students at end of the semester has been met
  • Hand-off to occur next week

Questions? Comments? Concerns?Thank you!