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 54 for “"Flight Envelope"”.
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Flight envelope protection using flap hinge moment measurement
An experimental investigation of the sensitivity of flap hinge moment to airfoil surface contamination was conducted at the University of Illinois at Urbana-Champaign Aerodynamics Research Lab. Tests were conducted on two airfoil models, an NACA 3415 and an NACA 23012, at Reynolds numbers of 1.8 × …
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Designing and evaluating an automation display for use with a flight envelope protection system
… a display system designed for use with the Flight Envelope Protection system. We present our both our design, and initial results from a pilot study performed at the Illinois Simulator Laboratory.
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Aircraft loss-of-control prevention via backup flight control law design and flight envelope protection
… 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 vertical-tail damage is proposed. In …
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Bio-Inspired Mechanism for Aircraft Assessment Under Upset Conditions
… detection, identification, evaluation and flight envelope estimation has been developed and implemented. Data from a six degrees-of-freedom flight simulator were used to define a large set of 2-dimensional self/non-self projections as well as for the generation of antibodies and identifiers …
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Battery Centric Serial Hybrid Aircraft Performance and Design Space
<p>The design space and flight envelope of a battery centric serial hybrid aircraft has been analytically derived. The formulation assumes cruising flight only and all energy available is used. The flight envelope can be generated for any conventional propeller driven serial hybrid aircraft. The …
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Aircraft Abnormal Conditions Detection, Identification, and Evaluation Using Innate and Adaptive Immune Systems Interaction
Abnormal flight conditions play a major role in aircraft accidents frequently causing loss of control. To ensure aircraft operation safety in all situations, intelligent system monitoring and adaptation must rely on accurately detecting the presence of abnormal conditions as soon as they take …
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Computational Prediction of Stall Aerodynamics and Evaluation of Ground Effect for a Generic Transport Aircraft
Flight safety of modern transport aviation depends to a large extent on the skills of the pilot in dealing with manual aircraft control in critical Flight situations.According to Boeing's document " Statistical Summary of Commercial Jet Air-plane Accidents, Worldwide Operations (1959-2016)" about …
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Safety-Aware Trajectory Generation for Increased Autonomy in Advanced Air Mobility
… framework designed to maintain safe and feasible flight under reduced flight envelope conditions for a lift+cruise eVTOL aircraft. A unified control architecture based on incremental nonlinear dynamic inversion is implemented to support both pilot-in-the-loop and autonomous operation. Flight …
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Advanced four-dimensional trajectory generation for tactical guidance of unmanned aerial vehicles
… The current framework for automatic flight control is analysed, along with current research into autonomous unmanned systems, to develop a technique for trajectory generation that not only works efficiently in the current architecture but also enhances the capabilities. The algorithm …
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L1 adaptive control augmentation system for the X-48B Aircraft
… verify the performance bounds of the adaptive flight control system at various flight conditions. We demonstrate that the resulting L1 adaptive controller does not require tuning or redesign from one flight condition to another. Furthermore, once designed according to the theoretical …
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Development and Use of a Spatially Accurate Polynomial Chaos Method for Aerospace Applications
… of uncertainty may include the freestream flight conditions of a vehicle, physical modeling parameters, geometric fidelity, numerical error, and model-form uncertainty, among others. Moreover, while some uncertainties may be treated as probabilistic, aleatory sources, other uncertainties …
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Novel Airframe Design for the Dual-Aircraft Atmospheric Platform Flight Concept
… innovative Dual-Aircraft Atmospheric Platform flight concept that exploits stratospheric wind velocity gradients to remain aloft indefinitely. Classical aircraft preliminary design techniques and high-fidelity tools were used to establish a baseline configuration.</p> <p>Performance …
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A precision autonomous parachute delivery system
… a robotic parachute system was designed and flight tests were conducted to evaluate flight performance in deep brakes, for eventual use in autonomous accuracy landing approaches for targets two meters in size or smaller. Numerous design improvements were evaluated and/or implemented, and …
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Analysis of High Angle of Attack Maneuvers to Enhance Understanding of the Aerodynamics of Perching
… vastly unsteady aerodynamics, mimicking the flight maneuvers of natural flyers requires a deep understanding of the unsteady flow physics while also demanding the ability to expand the vehicle's flight envelope beyond normal conditions. Experimental and computational investigations are …
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Improved continuous-time higher harmonic control using H [infinity] methods
… controllers are designed for constant flight conditions. A gain-scheduled control law is used to reduce the vibration throughout the flight envelope. The gain-scheduling is accomplished by blending the outputs from fixed-order controllers designed for different flight conditions. The …
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The Static Thrust Characterization of the Quatra Aerrow Q100XL Engine for Flight Performance Prediction of the 1/3-scaled Cessna 172P Model
… to predict the thrust as a function of forward flight velocity required for the one-third-scaled Cessna 172P. This model was designed to verify scaling laws. Therefore, it is important that it be aerodynamically scaled and that it have similar thrust characteristic as that of the full scale …
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Implementation of an Air Supply Unit Control Scheme for the UC2AV (Unmanned Circulation Control Aerial Vehicle)
… controllers is conducted throughout a simulated flight envelope consisting of takeoff, cruise, and landing phases. Response characteristics and power consumption during each phase is evaluated. Results obtained from experimentation validate the applicability of both PID and FL control for …
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A linear parameter varying control methodology for reduction of helicopter higher harmonic vibration
… controller that is effective throughout the flight envelope of the helicopter, in spite of variations in vibration levels and dynamics with flight condition. Analysis of a UH-60 Black Hawk helicopter modeled in the Rotorcraft Comprehensive Analysis System (RCAS) aeromechanical simulation …
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Experimental and Computational Analysis of a 3D Printed Wing Structure
… or divergence free aircrafts within a designated flight envelope. The aeroelastic analysis includes specifically tailoring the design in order to prevent flutter (passive control) or eliminate it by applying input on control surfaces (active control). High-fidelity models such as coupled …
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Robust, model-based fault detection for commercial transport air data probes.
… is designed using linearized models at one flight condition. The detection performance is evaluated at a particular reference flight condition using linear analysis and nonlinear simulations. Detection performance across the flight envelope is examined, and scheduling and blending techniques …
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