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131191 https://hdl.handle.net/2286/R.I.56824 http://rightsstatements.org/vocab/InC/1.0/ 2020-05 48 pages eng Teoharevic, Filip Grewal, Anoop Lee, Hyunglae Mechanical and Aerospace Engineering Program Barrett, The Honors College Text This thesis will cover the basics of 2-dimensional motion of a parafoil system to determine and<br/>design an altitude controller that will result in the parafoil starting at a location and landing within the<br/>accepted bounds of a target location. It will go over the equations of motion, picking out the key<br/>formulas that map out how a parafoil moves, and determine the key inputs in order to get the desired<br/>outcome of a controlled trajectory. The physics found in the equations of motion will be turned into<br/>state space representations that organize it into differential equations that coding software can make<br/>use of to make trajectory calculations. MATLAB is the software used throughout the paper, and all code<br/>used in the thesis paper will be written out for others to check and modify to their desires. Important<br/>aspects of parafoil gliding motion will be discussed and tested with variables such as the natural glide<br/>angle and velocity and the utilization of checkpoints in trajectory controller design. Lastly, the region of<br/>attraction for the controller designed in this thesis paper will be discussed and plotted in order to show<br/>the relationship between the four input variables, x position, y position, velocity, and theta.<br/>The controller utilized in this thesis paper was able to plot a successful flight trajectory from<br/>10m in the air to a target location 50m away. This plot is found in figure 18. The parafoil undershot the<br/>target location by about 9 centimeters (0.18% error). This is an acceptable amount of error and shows<br/>that the controller was a success in controlling the system to reach its target destination. When<br/>compared to the uncontrolled flight in figure 17, the target will only be reached when a controller is<br/>applied to the system. Control System Aerodynamics Glider Parafoil Controller Design for a 2-D Parafoil Return System