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 31 for “"aircraft control"”.
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Digital model reference aircraft control
… model reference scheme is presented for the control of the longitudinal modes of an EBF-STOL aircraft. The method used is based on Liapunov's direct method and is used to update feedback and feedthrough matrices. An equilibrium point of the EBF-STOL is chosen about which to constrain …
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Convex Modeling Techniques for Aircraft Control
The need to design a controller that self-schedules itself during the flight of an aircraft has been an active area of research. New methods have been developed beyond the traditional gain-scheduling approach. One such design method leads to a linear parameter varying (LPV) controller that changes …
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Reinforcement Learning for Autonomous Aircraft Control and Aerial Maneuvering in Simulated Environments
… obstacles, and reach targets through continuous control. A combination of environment design and reward shaping was essential for achieving stable learning. Results show that performance improves significantly with training and proper reward design. Experiments across different difficulty levels …
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Magneto-Rheological Fluid Device as Artificial Feel Force System on Aircraft Control Stick
<p>The conventional feel system in any aircraft occupies large space in the cockpit and has complicated designs. The primary objective of this research is to develop an artificial feel force system that can overcome some drawbacks of the current feel force system. A novel feel system using …
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Design Demonstration and Optimization of a Morphing Aircraft Control Surface Using Flexible Matrix Composite Actuators
The morphing of aircraft wings for flight control started as a necessity for the Wright Brothers but quickly fell out of favor as aircraft increased speed. Currently morphing aircraft control is one of many ideas being explored as we seek to improve aircraft efficiency, reduce noise, and other …
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A Comparison of Two Methods Used to Deal with Saturation of Multiple, Redundant Aircraft Control Effectors
… of two methods to deal with allocating controls for unattainable moments in an aircraft was performed using a testbed airframe that resembled an F/A-18 with a large control effector suite. The method of preserving the desired moment direction to deal with unattainable moments is …
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The Effects of Angle-of-Attack Indication on Aircraft Control in the Event of an Airspeed Indicator Malfunction
… Board, and other sources show that loss of control is the leading cause of aircraft accidents. Further evaluation of the data indicates that the majority of loss of control accidents are caused by the aircraft stalling. In response to these data, the Federal Aviation Administration and the …
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A Parametric Study of Pilot Performance With Modified Aircraft Control Dynamics, Varying Navigational Task Complexity, and Induced Stress
Made available in DSpace on 2014-12-10T23:36:44Z (GMT). No. of bitstreams: 1 7405614.pdf: 3380243 bytes, checksum: b101bb1ef63f447254e71eca5921971b (MD5) Previous issue date: 1973
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The impact of GPS velocity based flight control on flight instrumentation architecture
… Positioning System (GPS) receiver to close the aircraft's flight control loop. A novel framework to synthesize attitude information from GPS velocity vector measurements is discussed. The framework combines the benefits of high-quality GPS velocity measurements with a novel velocity vector based …
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Active Flight Path Control for an Induced Spin Flight Termination System
In this thesis, we describe a method for controlling the cycle-averaged velocity direction of a fixed-wing aircraft in an unpowered, helical descent. While the aircraft propulsion system is disabled, either intentionally or due to a failure, the aerodynamic control surfaces (aileron, elevator, and …
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Model-following control applications to nonlinear mechanical systems
Model-following control design methodology is introduced for nonlinear plants and models. The plant equations are considered to be linear in the control input. Dynamic matching conditions are presented and the resulting error dynamics are given. The stability of error dynamics is ensured, using …
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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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On the development of computer code for aircraft flight dynamics analysis
The stability analysis of the aircraft can be evaluated in two flight modes: longitudinal stability analysis and the lateral – directional stability analysis. The present work focused on the second mode of flight. The stability analysis carried out by evaluates the behavior of three flight …
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Measurement of head acceleration and angular rate experienced by aerobatic pilots
… during flight can increase the risk of loss of aircraft control. The actual G forces experienced at head-level in aerobatic pilots have never been characterized, and this study intends to solve this knowledge gap. Methods: Five volunteers at the 2009 US National Aerobatic Championships were …
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Advances in Aero-Propulsive Modeling for Fixed-Wing and eVTOL Aircraft Using Experimental Data
Small unmanned aircraft and electric vertical takeoff and landing (eVTOL) aircraft have recently emerged as vehicles able to perform new missions and stimulate future air transportation methods. This dissertation presents several system identification research advancements for these modern aircraft …
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Control of flexible-link manipulators using nonlinear H(infinity) techniques
… exhibit significant nonlinear behavior. For control of systems exhibiting nonlinearities, the normal design procedure is to construct a linearized approximation of the process model followed by the application of a linear control methodology. This procedure, however, can yield unsatisfactory …
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Robust control of nonlinear systems in the presence of uncertainties
… size, and the objective is to find a class of controller which can achieve some prescribed behaviour for all possible variations of the uncertainties within the prescribed bounds. This has found wide applications in such areas as robotics and aircraft control.<br/><br/>The results presented …
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Robust post-stall perching with a fixed-wing UAV
… far beyond the capabilities of our best aircraft control systems. In this thesis, I present a controller synthesis technique for achieving robust, post-stall perching with a fixed-wing Unmanned Aerial Vehicle (UAV). Using sum-of-squares (SOS) programming and building on a novel control …
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Application of Control Allocation Methods to Linear Systems with Four or More Objectives
Methods for allocating redundant controls for systems with four or more objectives are studied. Previous research into aircraft control allocation has focused on allocating control effectors to provide commands for three rotational degrees of freedom. Redundant control systems have the capability …
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Characterization of flow control using programmable multi-directional plasma actuators
… which are beneficial for the efficiency and control of lifting bodies and airframes. The research demonstrates that the described programmable, multi-directional, plasma actuators may be used to create an assortment of desired flows and to aid in the control of airframes.
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