Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Actuator saturation (1)
- Aerodynamics (1)
- Augmented state linear covariance (1)
- Bio‐inspired (1)
- Closed Skew‐Normal (1)
-
- DOP (1)
- Dilution of Precision (1)
- Duration (1)
- Erosion (1)
- Event triggers (1)
- Flight mechanics (1)
- GEO (1)
- Gaussian Mixture (1)
- Genetic algorithm (1)
- Hybrid (1)
- Kalman (1)
- LinCov (1)
- Linear Covariance (1)
- Linear covariance analysis (1)
- Linearized control (1)
- Long (1)
- Long Duration (1)
- Low (1)
- Low Erosion (1)
- Lunar (1)
- Missile engagement (1)
- Moon (1)
- Nozzle (1)
- Optimal (1)
- Pyrolytic Graphite (1)
Articles 1 - 5 of 5
Full-Text Articles in Aerospace Engineering
Cislunar Navigation Techniques And Navigation Performance Optimization, Quinn P. Moon
Cislunar Navigation Techniques And Navigation Performance Optimization, Quinn P. Moon
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Nova-C is a lunar lander developed by the private company Intuitive Machines to deliver commercial payloads to the Moon. The IM-1 mission set for 2023 will launch and land the Nova-C near the Moon's south pole. In this research, various navigation techniques are explored to determine the lander's position and velocity during key segments. This process is studied for key mission events including trajectory correction maneuvers (TCMs), lunar orbit insertion (LOI), and descent orbit insertion (DOI). Each mission segment, referred to as an Orbit Determination Segment (OD), is analyzed with three different navigation techniques: Monte Carlo Analysis, Linear Covariance Analysis, …
Low-Erosion Nozzle Materials For Long-Duration Hybrid Rocket Burns, Russell S. Babb
Low-Erosion Nozzle Materials For Long-Duration Hybrid Rocket Burns, Russell S. Babb
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Hybrid rocket systems, which employ a solid fuel grain and a liquid oxidizer, are a low-cost and environmentally friendly alternative to traditional rocket systems. However, hybrid rockets suffer from an increased nozzle throat erosion rate, which impacts motor performance and reliability. To address this issue several materials and low-erosion nozzle configurations were tested. The results of the testing campaign produced a nozzle that reduce the throat erosion rate five-fold.
Augmented State Linear Covariance Applications For Nonlinear Missile Engagements, Jeffrey Scott Clawson
Augmented State Linear Covariance Applications For Nonlinear Missile Engagements, Jeffrey Scott Clawson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Sustained actuator saturation is a common occurrence for missile engagements. The saturation nonlinearity creates some difficulty for high-fidelity linear analysis methods. This dissertation investigates three methods of modeling actuator saturation in an advanced linear analysis. The linear covariance tools from this dissertation run extremely fast and provide several advantages over other linear missile engagement analysis methods. First, a simulation is developed and validated for a target engagement scenario without actuator saturation. Next, saturations are introduced to the problem, along with the first analysis method: statistical linear covariance analysis. This method combines the augmented state linear covariance framework with the statistical …
Aerodynamic Implications Of A Bio‐Inspired Rotating Empennage Design For Control Of A Fighter Aircraft, Christian R. Bolander
Aerodynamic Implications Of A Bio‐Inspired Rotating Empennage Design For Control Of A Fighter Aircraft, Christian R. Bolander
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
This dissertation presents an analysis of the aerodynamics for an aircraft using a novel, bio-inspired control system. The control system is a rotating tail, that is inspired by the way in which birds use their tail to control their flight. An aerodynamic model for a baseline aircraft and a bio-inspired variant are created by referencing well-known relationships for the aerodynamics of flight, which are then used to analyze the available flight envelope at which each aircraft can reach two different equilibrium states. An analysis of the total aerodynamic control authority of each aircraft is also included along with a preliminary …
High Efficiency Angles-Only Space-Based Approaches For Geosynchronous Orbit Catalog Maintenance With Sparse Information, Louis M. Tonc
High Efficiency Angles-Only Space-Based Approaches For Geosynchronous Orbit Catalog Maintenance With Sparse Information, Louis M. Tonc
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The thesis of this dissertation proposes a novel filter algorithm to improve tracking and catalog maintenance of uncooperative satellites and other Resident Space Objects (RSOs) in Geosynchronous Equatorial Orbit (GEO). Tracking can be supported by space-based tracking from observer satellites (OBSs). Practical limitations can lead to long time gaps between measurement updates when tracking RSOs from an OBS, which may induce a loss of fidelity or divergence of the estimation algorithm. The Extended Kalman filter (EKF) is commonly used for tracking RSOs but it diverges as a consequence of nonlinearity in the dynamics and nonlinearity in the optical measurements from …