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.
Results
Showing 1 to 15 of 15 for “"control effectors"”.
-
Investigation of Control Effectors for Ducted Fan VTOL UAVs
… order of Re = 0.96 x 106 to 4.6 x 106. Various control effectors were mounted to the vehicle and tested for maximum control authority to reduce the nose-up pitch moment created during forward flight or with crosswinds present. Static and wind tunnel tests were conducted to measure each control …
-
Constrained control allocation for systems with redundant control effectors
Control allocation is examined for linear time-invariant problems that have more controls than degrees of freedom. The controls are part of a physical system and are subject to limits on their maximum positions. A control allocation scheme commands control deflections in response to some desired …
-
Dynamic Modeling of a Supersonic Tailless Aircraft with All-moving Wingtip Control Effectors
… dynamics was completed first. Elevator control power was derived from the dynamic response requirements for pitch chosen by Techsburg. The propulsion model utilized General Electric F-414-400-like turbofan engines because an engine deck was readily available. Work on the six …
-
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 …
-
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 …
-
A Comparison of Control Allocation Methods for the F-15 ACTIVE Research Aircraft Utilizing Real-Time Piloted Simulations
A comparison of two control allocation methods is performed utilizing the F-15 ACTIVE research vehicle. The control allocator currently implemented on the aircraft is replaced in the simulation with a control allocator that accounts for both control effector positions and rates. Validation of the …
-
The Design and Implementation of a GUI-Based Control Allocation Toolbox in the MATLAB Environment
Control Allocation addresses the problem of the management of multiple, redundant control effectors. Generally speaking, control allocation is any method that is used to determine how the controls of a system should be positioned to achieve some desired effect. An infinite number of allocation …
-
Investigations into the Role of Paf1 Complex Proteins in Drosophila Ovaries
… the expression of regulatory proteins that control effectors of cellular physiology and metabolism. The outcome of protein function within a cell decides its fate from size, shape, function, the ability to divide or the lack thereof. The behavior of cells that can divide to give rise to …
-
Retrofit systems for reconfiguration in civil aviation
… a reconfiguration module to an existing control law is reported in this thesis. The concept is motivated by the need for low cost, add-on modules that improve air safety in the existing fleet of civil air transport vehicles. A direct adaptive approach that accommodates control surface …
-
Aircraft System Identification Approach for Control Surface Fault Diagnosis
… a model-based FDD approach for identifying control-surface loss of effectiveness on a small, fixed-wing research aircraft. The work considers several real-time system identification methods to estimate changes in control effectiveness and provide fault information to a fault-tolerant control …
-
Advances in Aero-Propulsive Modeling for Fixed-Wing and eVTOL Aircraft Using Experimental Data
… multisine input excitations to aircraft control effectors in wind-tunnel testing is developed to improve test efficiency and identified model utility. Finally, the culmination of this dissertation is synthesis of the techniques described throughout the document to form a flight-test …
-
Geometric algorithms for input constrained systems with application to flight control.
… developed to solve some problems of analysis and control design for unstable linear dynamical systems having their input constrained by maximum amplitude and rate of the control signals. Although the results obtained are of a general nature, all the problems considered are induced by flight …
-
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 …
-
Aircraft loss-of-control prevention via backup flight control law design and flight envelope protection
… seeks to tackle the aircraft loss-of-control problem by adaptive backup flight control law design and flight envelope protection for aircraft with physical damage. In the first part of the study, a backup lateral-directional flight control law for mid-sized transport aircraft with …
-
Effects of Duct Lip Shaping and Various Control Devices on the Hover and Forward Flight Performance of Ducted Fan UAVs
… on the interior of the duct lip surface. Control vanes positioned aft of the duct were tested as the primary attitude control for the vehicle. An empirical control vane model was created based on the static data for the control vanes, and it was applied to wind tunnel test results to …