Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Aircraft Dynamics"”.
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Testing the effects of violating component axioms in validation of complex aircraft systems
… faults in complex large-scale integrated aircraft systems, especially where they interact with, and control, the aircraft dynamics. A general assumption considered in the reliability of such systems is that any component level fault will be monitored, detected and corrected by some fault …
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Parameter Informed Reinforcement Learning for Vehicle System Identification
… essential for modeling and controlling vehicle dynamics. This dissertation explores the application of Parameter Informed Reinforcement Learning (PIRL) as a novel approach to system identification (SYSID). PIRL integrates prior system knowledge, such as physical parameters, into reinforcement …
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Performance and Robustness Assessment for a Robust Port-Hamiltonian Flight Controller
… guarantees due to the structure of the aircraft dynamics. This work presents an implementation of a novel control law which simultaneously transforms the nonlinear fixed-wing aircraft dynamics into a port-Hamiltonian structure using feedback linearization, from which input-to-state …
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Passivity-Based Control of Small Unmanned Aerial Systems
… control law that stabilizes the motion of an aircraft with a large region of attraction. {color{black} The energy-based control scheme is applied to both multirotor and fixed-wing aircraft}. Multirotor aircraft dynamics are cast into a port-Hamiltonian System and the concept of trajectory …
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System Design Methodology and Implementation of Micro Aerial Vehicles
… MAVs seek a breakthrough in the current unmanned aircraft market, by having the ability of full mission autonomous control, from waypoints trajectory optimization to position control and aircraft auto-stabilization, while maintaining a full systems take-off weight of not more than 50 g, in a tiny …
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Direct Adaptive Control for Stability and Command Augmentation System of an Air-Breathing Hypersonic Vehicle
… physics based model of the longitudinal dynamics for an air breathing hypersonic vehicle. The model, derived from first principles, captures the complex interactions between the propulsion system, aerodynamics, and structural dynamics. The linearized aircraft dynamics show unstable and …
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Planning under uncertainty for dynamic collision avoidance
… for unmanned aerial vehicles. Before unmanned aircraft can fly safely in civil airspace, robust airborne collision avoidance systems must be developed. Instead of hand-crafting a collision avoidance algorithm for every combination of sensor and aircraft configurations, we investigate automatic …
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Longitudinal axis display requirements for high speed cruise
Altitude excursions particular to high speed aircraft are investigated in this thesis. An aerodynamic database of the XB-70 is created and a longitudinal linear model is constructed for a high speed cruise flight condition. An examination of the unpiloted aircraft dynamics revealed that the …
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Design and Flight-Path Simulation of a Dynamic-Soaring UAV
… A modular design paradigm is adopted for the aircraft dynamics model, which makes it conducive to use the same environment to simulate other aircraft models. Multiple wind-shear models are synthesized to study the overall energy gain for low and high-altitude dynamic soaring. In addition to …
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Neural Network Models for Generating Synthetic Flight Data
… flight data that is consistent with the aircraft dynamics.</p>
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An adaptive control technology for flight safety in the presence of actuator anomalies and damage
… directly affect the safe operation of the aircraft. A technology that has the potential for enabling a safe flight under these adverse conditions is adaptive control. One of the main features of an adaptive control architecture is its ability to react to changing characteristics of the …
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Modeling and Control of an Active Dihedral Fixed-Wing Unmanned Aircraft
Unmanned aircraft systems (UAS) often encounter turbulent fields that perturb the aircraft from its desired target trajectory, or in a manner that increases the load factor. The aircraft's fixed dihedral angle, providing passive roll-stiffness, is often selected based on lateral-directional …
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Development of technologies for low-cost oceanographic unmanned aeronautical vehicles
… optimised matrix calculations for high-frequency aircraft state estimates on a low-powered processor and the use of a finite impulse response filter for reduced aliasing of transmitted flight data.<br/>A novel in-flight method for autonomously optimising controller response has been developed and …
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Trajectory optimization using mixed-integer linear programming
… is developed to enable the inclusion of aircraft dynamics in a linear optimization, and also to include a general form of waypoint assignment suitable for UAV problems. Finally, these optimizations are used in model predictive control, running in real-time to incorporate feedback and …
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Aircraft stability and departure prediction using Eigenvalue Sensitivity analysis
… with information describing where and when an aircraft is likely to depart, but also information about the departure characteristics, enabling the analyst to design for better departure resistance. While the eigenvalue and eigenvector approach is straightforward, it is a broader approach than …
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Estimation of Air Flow Angles Derived from an Inertial Navigation System
… System as a primary method for measuring aircraft air flow angles in flight testing. The traditional methods used to measure air flow angles consist of sensors external to the aircraft, such as an air data boom or an angle of attack probe. The advantage of using INS to measure air flow …
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Pilot Variability During Pilot-Induced Oscillation
… Oscillations (PIO) are described as pilot-aircraft dynamic couplings which can lead to instability in an otherwise stable system. Previous and ongoing research has attempted to explain, predict, and avoid such oscillations. In contrast to other research, this effort backs away from pilot …
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Real-Time Moment Rate Constrained Control Allocation for Aircraft with a Multiply-Redundant Control Suite
The problem of aircraft control allocation is that of finding a combination of control positions that cause the resulting aircraft moments to most closely satisfy a given desired moment vector. The problem is easily solved for the case of an aircraft having three control surfaces, each of which …
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OnBoard Parameter Identification for a Small UAV
… laws, the availability of accurate post failure aircraft models improves performance. While look-up tables of aircraft models can be created for failure conditions, they may fail to account for all possible failure scenarios. Thus, a real-time parameter identification program eliminates the need …
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