https://scholarworks.moreheadstate.edu/student_scholarship_posters/1008/thumbnail.jp

Brown, Kevin

Malphrus, Benjamin

Roberts, Alexander

English

Morehead State University

Printing:This poster is 48” wide by 36” high. It’s designed to be printed on a largeCustomizing the Content:The placeholders in this formatted for you. placeholders to add text, or click an icon to add a table, chart, SmartArt graphic, picture or multimedia file.Tfrom text, just click the Bullets button on the Home tab.If you need more placeholders for titles, make a copy of what you need and drag it into place. PowerPoint’s Smart Guides will help you align it with everything else.Want to use your own pictures instead of ours? No problem! Just rightChange Picture. Maintain the proportion of pictures as you resize by dragging a corner.Lunar Ice Cube: Development of a numerical model for attitude control*Alexander Roberts, Dr. Benjamin Malphrus and Kevin Brown, Mentors, Department of Earth and Space     Science, College of ScienceINTRODUCTIONLunar Ice Cube is a small satellite designed to prospect the moon for any sign of water along with any other volatiles from a low-periapsis, highly inclined lunar orbit and has been selected by NASA to fly on Exploration Mission-1.Lunar Ice Cube requires a complex attitude control model for the 7-hour science orbit. The science orbit requires on board instruments to be pointed towards the moon during the periapsis, on board communications systems oriented towards the Earth for communications and ranging, Solar arrays oriented towards the Sun for charging the space craft, and the spacecrafts minor axis must be oriented perpendicular to the plane of the ecliptic for thermal management. This project involves the creation of a numerical model for the satellites attitude control during the scientific orbit to insure the spacecraft can perform these tasks autonomously. The project is taking advantage of simulation and analysis tools such as 42, STK, and Octave (open source version of MATLAB) to accurately develop and simulate the model. The results of the project will be implemented in to the Lunar Ice Cube sometime in the near future and launched into the Moons orbit where the attitude control model will be put to the test.           • During the creation of this model the following simulation and analysis tools are being used to create and accurately develop an attitude model for the Lunar Ice Cube mission:  • 42- 42 is an open source program that is used for the creation of simulations for a spacecrafts attitude control system analysis and orbital dynamics. 42’s main use is to support and validate attitude control systems through integration and testing. It features the ability to have multiple spacecraft anywhere in our solar system, Multi-body dynamics, rigid and flexible bodies, and more. This project will represent the rotation between two reference frames via direction cosines (the direction cosines are the cosines of angles between the vector and the three coordinate axes), Euler angles (three angles used to describe the orientation of a rigid body with respect to a fixed coordinate system), and quaternions ( any set of numbers that comprise a four-dimensional vector space with a basis consisting of the real number 1 and three imaginary units i, j ,k that follow special rules of multiplication) as required by 42. • Octave- Octave is an open source version of MATLAB. It’s primary use for this project will be to take ASCII output files generated from 42 for post-processing and plotting. • STK- Systems Tool Kit by AGI is software used to evaluate system performance. RESEARCH/SIMULATIONS• Demonstration of 42 software with Lunar Ice Cube modelREFERENCES 3D Model of Lunar Ice Cube made in MeshLab  RESULTSCONCLUSIONS/FURTHER RESEARCH• Thomson, W.T. 1986. Introduction To Space Dynamics. Dover Publications, Inc., New York• Szebehely, Victor G. 1993. Adventures in Celestial Mechanics a First Course in the Theory of Orbits. University of Texas Press., Austin• Sellers, Jerry J., 2005. Understanding Space An Introduction to Astronautics. McGraw-Hill Companies Inc., United States1• *Orbital Operations ~ 7 hours In conclusion even though there has been the successful completion of a few of the required tasks for this project there are still multiple tasks that are currently being worked on. In order to successfully achieve the remaining tasks, this project requires  working closely with Morehead State Space Science Center staff along with NASA.  These are the remaining goals that are currently being worked on. First, is defining the bodies for the spacecraft in order to allow the solar arrays to track the sun during the science orbit in order to charge the spacecraft. Second, is defining the pointing vectors for spacecraft on board instruments so the spacecraft can look for water. Third is the point to point communications so the spacecraft can contact Earth and send findings. Fourth, is defining reference frames for the spacecraft. Next, is defining the Kane body for gimballed or spherical joints. Alongside these tasks is the requirement of completing the two remaining certification tests for AGI’s systems tool kit. Lastly inputting the flight data for the lunar orbit into 42 so the previously mentioned tasks above can be placed into the 7-hour science orbit for completion and deployment of the attitude control model for the Lunar Ice Cube. • As of the completion of this poster  the following action items for this project have been completed. First, is the  successfully integrated a three-dimensional model of the Lunar Ice Cube spacecraft into 42. Second, is the successful plotting of the pointing angles for the Sun and Earth vectors. Finally, the achievement of level one certification with the STK program.  Apolune~3 hours for communication~ 3 hours to Charge Science Operations~ 20minPeriluneCalibration Data~ 2 minutesCalibration Data~ 2 minutesIDLE MODE• Operations in Typical Lunar Orbit• Demonstration of 42 Software

Lunar Ice Cube: Development of a numerical model for attitude control

https://scholarworks.moreheadstate.edu/cgi/viewcontent.cgi?article=1008&amp;context=student_scholarship_posters

Lunar Ice Cube: Development of a numerical model for attitude control

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