Date of Award
Dissertation - Open Access
Doctor of Philosophy in Engineering Physics
Dr. Sergey V. Drakunov, Ph.D
First Committee Member
Dr. William MacKunis, Ph.D
Second Committee Member
Dr. Stefan C. Mancas, Ph.D
Third Committee Member
Dr. John Huhges, Ph.D
Small spacecrafts requiring small propulsion systems are becoming more popular for low Earth orbit. It is important for these research satellites to have accurate guidance and control systems. Small propulsion systems will also be beneﬁcial for multiple small spacecrafts used future exploration expeditions beyond low Earth orbit. These small spacecrafts beneﬁt from the simplicity of low thrust cold gas propulsion systems. Additionally, large spacecrafts using low thrust, high speciﬁc impulse propellants for main propulsion systems, such as ion engines, allow longer and more ﬂexible missions, including Earth orbiting spacecraft and interplanetary spacecraft.
In order to extend the life of future planetary exploration missions, it becomes necessary to use In-Situ Resource Utilization (ISRU) to be able to extract resources such as water, oxygen, propellants, and building materials from the local target environment. Small free ﬂying vehicles can be used for quickly surveying planetary surfaces in order to search for potential resource locations. These surveying vehicles can also use such extracted propellants if their propulsion system is designed for it. Cold gas propulsion provides a ﬂexible system to use locally extracted or manufactured propellants.
This dissertation investigates nonlinear feedback control techniques for spacecraft with low thrust, cold gas thrust, and spacecraft with cold gas thrust. A model for a cold gas propulsion system is developed for designing control systems for multiple types cold gas thrusters. The model is also used for testing control algorithms in simulation. The cold gas model is validated from a cold gas propulsion hardware testing, and a control law is tested on hardware.
Scholarly Commons Citation
Kitchen-McKinley, Samuel J., "Variable Structure Feedback Control with Application to Spacecraft with Small Thrust Propulsion Systems" (2017). PhD Dissertations and Master's Theses. 357.