CAPSat: Undergrad students prepare to launch a satellite
University of Illinois students are designing a small satellite, or CubeSat, after winning an award for funding from NASA. The project gives undergraduate students educational experience with aerospace technology and travel. Three experiments will occur on the CubeSat. The experiments, known as CAPSat, involve cooling, annealing and pointing (CAP).
The project stretches across different departments at Illinois and even different Universities. ISE’s Professor James Allison guides the pointing payload experiment, while Aerospace Engineering Senior Yukti Kathuria is the pointing payload lead. Professor Alexander Ghosh of the Aerospace Department directs the cooling payload while Tiago Silva, graduate student in Aerospace Engineering takes the lead. Physics Professor Paul Kwait oversees the annealing portion, while Joe Stahl, a senior in Computer Science, is the leader with help from the University of Waterloo.
Junior Dawn Haken of Electrical Engineering is the bus leader. The bus is the main infrastructure of the satellite that allows the satellite to travel while holding the payloads. McKale Berg, junior in Aerospace Engineering, is the undergraduate team leader for CAPSat. Patrick Haddox is a PhD student in Aerospace Engineering and serves as the graduate advisor for the group.
Working on outreach, Bradley University is developing a mobile Satellite Control App, a Satellite Position Gamification project, and an augmented reality satellite development tool.
Allison says, that the pointing technology is “focused on a new strategy for controlling the orientation of spacecraft, and that’s something people are interested in right now because a lot of the current technology has reliability issues.”
Daniel Herber is a PhD candidate in Systems and Entrepreneurial Engineering in ISE. He describes the pointing technology as “an enabling technology [if] you want to see farther into space, you want to hold pictures for longer periods of time to get better exposure, things like that.”
Herber was involved in the very early stages of CAPSat. He says, “The initial things in the project were simply ‘let’s think of a cylinder, another cylinder and a spring’. You twist the one cylinder and then the other cylinder twists as well. That was where we started and now we’re at the point where they’re going to launch something. That’s kind of how engineering should work. You start simple and you kind of build up to this real, complicated physical system.”
Explaining how the experimental pointing technology works, Allison says, “We’re looking at a new technique where we’re trying to use an existing part of this system to provide attitude control. Most spacecraft have some type of solar array, and we’re using actuators that are bonded to the array… When you apply an electric field to those actuators, they can contract or expand depending on the polarity of the voltage and when you do that, when you bond something like that to the structure of the solar panel, if you expand it or contract it, it makes the panel bend and if we bend these panels… the main body of the spacecraft, the bust, is then going to move in the opposite direction.”
Herber says, “It’s hard when everything’s moving, just vibrating slightly, because in space, [when] something starts moving it’s not going to stop unless you stop it… That’s the one limitation in space. This technology, it’s proven, it can reduce those vibrations a lot. It can also hold onto a far location for a long period of time.”
A PhD student in Aerospace Engineering, Vedant says he worked on the bus for two years and for the past year he has been working on the payload, or experimental portion of the satellite.
“Personally, I’m pretty happy with the payload that we’re developing,” Vedant says. “We’ve recently added more complexity to the pointing payload, and when that happened, when we realized that we would actually make it more complicated and achieve more scientific goals… I was really happy.”
Yukti Kathuria is a senior in Aerospace Engineering. She is the payload development team leader for CAPSat. Kathuria’s job includes team management and technical research. Kathuria says “My long-term project is making the sensors that will be on the panel, aesthetically and dynamically.”
Vedant says that his favorite part of working on CAPSat is the constraints. “It’s something that doesn’t let me go easy on my project, it’s the challenges, but you feel good once you’ve overcome the challenges.”
Kathuria says, “I really like the technology and I try to get involved as much as I can.” When asked what her favorite part of CAPSat is, Kathuria is unable to pick, and instead says, “literally every part” is her favorite part.
The satellite will be given to NASA in June 2018. Vedant says, “Everybody is putting a lot of effort into it right now. We are just trying to hit our schedule, as closely as possible.”
Kathuria says that projects like this are “exactly what I joined Aerospace Engineering for, working on developing new technologies that work in space.”
Looking to the future, Vedant says, “I just hope for the best. It’s going to be interesting and it’s a fun and technologically challenging question that we’re planning to answer. If we can get the answers that we have an intuition that we will get, that will be fun for almost everybody in this field, everybody in Aerospace.”
According to James Allison, "the pointing payload for CAPSat is based on the results of a multi-year collaboration between my group and JPL ($430,000 total funded by NASA, started in 2014). In other words, CAPSat is a flight demonstration of technology developed by earlier fundamental research."
Herber says, “It is definitely exciting to see multiple years worth of work culminate into something that is going to be launched.”
With the deadline for CAPSat approaching quickly, Kathuria says, “It’s a project that’s close to everyone’s hearts right now."
For further reading:
Christian M. Chilan, Daniel R. Herber, Yashwanth Kumar Nakka, Soon-Jo Chung, James T. Allison, Jack B. Aldrich, and Oscar S. Alvarez-Salazar. "Co-Design of Strain-Actuated Solar Arrays for Spacecraft Precision Pointing and Jitter Reduction", AIAA Journal, Vol. 55, No. 9 (2017), pp. 3180-3195. https://doi.org/10.2514/1.J055748
Read More: https://arc.aiaa.org/doi/10.2514/1.J055748