Dec 17, 2012

3D printed satellites

There were some articles floating around on 3d printing satellites but not much details, so I complied some material on current state-of-play in the field.

Most of the 3d printing is related to Cubesat satellites. They are small (10X10X10 cm) picosatellites that are launched as auxiliary cargo on regular big scale launches.





3d printing is used in design / development phase or for printing working satellites support structure.




There is a full scale model of ArduSat on Thingiverse: http://www.thingiverse.com/thing:27300



Naval Graduate School conducted crash tests and released a paper "Direct Manufacturing of CubeSat Using 3-D Digital Printer and Determination of Its Mechanical Properties" for DARPA. Check links for much more  details and videos.



Cubesat design specifications:

http://www.cubesat.org/images/developers/cds_rev12.pdf 

Thesis on feasibility of 3d printing Cubesat satellites:

http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1851&context=theses

From the summary of study:

This study has found that a CubeSat can be developed to successfully incorporate the use of 3D printing manufacturing techniques into its design. This technology provides a potential cost savings of thousands of dollars, even for structures that would be simple to machine. Additional cost savings would be seen for very complex structures that would require advanced machining technology such as Electrical Discharge Machining to produce with aluminum. Using a Tyvak Nanosatellite Systems Intrepid system board at a cost of $3195  for the satellite avionics, it is conceivable that all the flight hardware for a CubeSat with a 3D printed structure could be procured for less than $5000. Not only do these materials provide the necessary strength to survive the rigorous testing and launch environments at a lower cost than machined aluminum, but they allow developers to be more creative with their satellites. Without any limitations from machinability, parts can be produced as they are imagined and new levels of optimization and functionality can be achieved. Further, extremely complex shapes, and even working mechanisms can be produced with 3D printing processes that cannot be manufactured with conventional machining. This allows designers create parts that require no post processing or assembly, streamlining the entire production process.

University of Texas at El Paso’s W. M. Keck Center for 3D Innovation made advancements in 3d printed satellite sensors for their Trailblazer cubesat project (link).



Students of Montana State University plan to launch their amateur radio satellite PrintSat with nano carbon impregnated plastic by using a 3D printer. 

Looks like the future of space exploration is 3d printed. :-)

Let me know if there are some other interesting projects in this area.

Update (12.5.2014.):

KySat2 Cubsat was developed and launched with 3d printed parts.




More details at: http://3dprintingindustry.com/2014/05/09/3d-printing-cube-sat-launch-satellite/

Update (8.8.2014.):

NASA is developing 3d printed nanosatellite telescopic camera:

http://diy3dprinting.blogspot.com/2014/08/nasa-is-developing-fully-3d-printed.html

Update (23.11.2014.):

RedEye (a Stratasys company) in cooperation with JPL 3d printed functional antenna array for a satellite.

From the source:
Due to COSMIC-1’s success, U.S. agencies and Taiwan have been working on a follow-up project called FORMOSAT-7/COSMIC-2 that will launch six satellites into orbit in late 2016 and another six in 2018. NASA’s Jet Propulsion Laboratory (JPL) has developed satellite technology to capture a revolutionary amount of radio occultation data from GPS and GLONASS that will benefit weather prediction models and research for years to come.
COSMIC-2 design and development began in 2011 at JPL. Critical components of the COSMIC-2 design are the actively steered, multi-beam, high gain phased antenna arrays capable of receiving the radio occultation soundings from space. The amount of science the COSMIC-2 can deliver is dependent on the custom antenna arrays. Traditionally, only large projects could afford custom antennas. COSMIC-2 was a medium size project that required 30 antennas so minimizing manufacturing costs and assembly time was essential.
A standard antenna array support design is traditionally machined out of astroquartz, an advanced composite material certified for outer space. The team knew building custom antenna arrays out of astroquartz would be time consuming and expensive because of overall manufacturing process costs (vacuum forming over a custom mold) and lack of adjustability (copper sheets are permanently glued between layers of astroquartz). The custom antenna design also contained complex geometries that would be difficult to machine and require multiple manufacturing, assembly and secondary operations, causing launch delays. JPL decided to turn to additive manufacturing technology to prototype and produce the antenna arrays.
The manufacturing chosen to build accurate, lightweight parts while maintaining the strength and load requirements for launch conditions was Stratasys’ Fused Deposition Modeling (FDM). FDM could produce this complete structure as a single, ready-for-assembly piece. This would enable quick production of several prototypes for functional testing and the flight models for final spacecraft integration all at a low cost. FDM can also build in ULTEM 9085, a high strength engineering-grade thermoplastic, which has excellent radio frequency and structural properties, high temperature and chemical resistance and could be qualified for spaceflight.
Instead of purchasing an FDM machine to produce the parts internally, JPL turned to RedEye, one of Stratasys’ additive manufacturing service centers with the largest FDM capacity in the world and project engineering experts who have experience with the aerospace industry and its requirements.
The antenna array support structures were optimized and patented for the FDM process. All shapes were designed with an “overhead angle” of 45 degrees at most to avoid using break-away ULTEM support material during the build. “Designing the antennas with self-supporting angles helped with two things,” said Trevor Stolhanske, aerospace and defense project engineer at RedEye, “it reduced machine run time so that parts printed faster, and reduced the risk of breaking any parts during manual support removal.” JPL was also able to combine multiple components into one part, which minimized technician assembly and dimensions verification time and costs.
Although FDM ULTEM 9085 has been tested for in-flight components, it had never been used on the exterior of an aircraft, let alone in space. Therefore, in addition to standard functional testing (i.e. antenna beam pattern, efficiency, and impedance match), FDM ULTEM 9085 and the parts had to go through further testing in order to meet NASA class B/B1 flight hardware requirements.
Some of these tests included:
  • Susceptibility to UV radiation
  • Susceptibility to atomic oxygen
  • Outgassing (CVCM index was measured to be 0 percent)
  • Thermal properties tests – in particular, compatibility with aluminum panels. (Aluminum has a slightly different coefficient of thermal expansion than non-glass-filled ULTEM)
  • Vibration / Acoustic loads standard to the launch rocket
  • Compatibility with S13G white paint and associated primer
ULTEM 9085’s properties met all required qualification tests, proving the antennas are space-worthy. However, the highly reactive oxygen atoms present at the operating height of the satellite could degrade the plastic. To protect against oxygen atoms and ultraviolet radiation, ULTEM was tested for compatibility and adhesion with some of NASA’s protective, astronautical paints. In this case, S13G high emissivity protective paint was chosen to form a glass-like layer on the plastic structure and reflect a high percentage of solar radiation, optimizing thermal control of the antenna operating conditions.
From March 2012 – April 2013, RedEye produced 30 antenna array structures for form, fit and function testing. Throughout each design revision, RedEye’s project engineering team worked closely with JPL to process their STL files to ensure the parts met exact tolerances and to minimize secondary operations. RedEye’s finishing department deburred the parts where needed, stamped each with an identification number and included a material test coupon. They also reamed holes for fasteners that attach to the aluminum honeycomb panel and the small channels throughout the cones to the precise conducting wire diameter.
“Not only did NASA JPL save time and money by producing these antenna arrays with FDM, they validated the technology and material for the exterior of a spacecraft, paving the way for future flight projects” said Joel Smith, strategic account manager for aerospace and defense at RedEye. “This is a great example of an innovative organization pushing 3D printing to the next level and changing the way things are designed.”
As of 2014, the COSMIC-2 radio occultation antennas and FDM ULTEM 9085 are at NASA Technology Readiness Level 6 (TRL-6). RedEye was able to successfully enter the JPL Approved Supplier List and delivered 30 complete antennas for final testing and integration. The launch of the initial six satellites is scheduled for 2016. Another constellation will launch in 2018. The FORMOSAT-7/COSMIC-2 mission will operate exterior, functional 3D printed parts in space for the first time in history.

Here is a video of phased array antenna being printed:



Source article:

http://www.redeyeondemand.com/3d-printing-case-studies/nasa-3d-printed-satellite/

Here is a picture of a satellite with antenna being on lover right side of the spacecraft, shaped like plate with 12 cylinders: