mae 435 fall 2013. sahil dhalichristopher quarles michael foch brockton baskette kyle wade cian...
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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
Dead CubeSats are hard to track
De-Orbit Device Project aimed at Prototype for 1U CubeSats
Overview
De-orbit Device Project is multidepartment effort between the Mechanical and Electrical Engineering Departments
MAE 435 Group’s goal to build the prototype
Inflation Requirements
Sounding Rocket Altitude: 160kms.
Pressure for sublimation@160kms: 1.42*10-6
Temperature for sublimation@160kms: -41’C
Difficulties
Unknown leak in large vacuum chamber
Extensive man hours spent troubleshooting and brainstorming solutions
Ultimately had to resort to using small vacuum chamber
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.
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
• 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
Fig 1
Fig 2Fig 3
• 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.
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 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
Design remote activation for heating element
Fit all the parts together for one final test before launch.
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
Material - Aluminized Mylar for its strength and reflectivity. (DuPont Films)
Target Cross-sectional area – 1 m2
The inflation medium will be benzoic acid.
Constraints
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
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 stored in a washer with a screen.
Epoxied (cold welded) to inflatable.
Located on the inner surface of balloon.
Inflatable Prep
Vacuum Seal-Off Fitting – Oerlikon Leybold 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 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
Provides a pressurized zone to house the balloon.
Contains a valve mounted in the bottom surface. Current prototype does not account for
camera mounting
More Testing
5 mil Mylar holds pressure with 2 gaskets
There are multiple points of deformation in membrane
Conclusion
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
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