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 22 for “"flight regime"”.
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Flight Regime and Maneuver Recognition for Complex Maneuvers
… of this study is to demonstrate capability of flight regime recognition during complex maneuvers flown in a fixed wing airplane using measured data from an Inertial Measurement Unit (IMU). Flight Regime Recognition (FRR) is required for numerous applications in the aerospace and aviation …
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Adaptive Control of the Transition from Vertical to Horizontal Flight Regime of a Quad-Tailsitter UAV
… the transition between vertical and horizontal flight regimes. It is evident in the literature that most researchers choose to model and control tailsitter UAVs using separate methods for the vertical and horizontal flight regimes and combine them into one control architecture. The novelty of …
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Application of Kalman Filtering to Real-time Flight Regime Recognition Algorithms in a Helicopter Health and Usage Monitoring System
… the application of Kalman filters to real-time Flight Regime Recognition (FRR) algorithms to identify the regime flown and observe transitions between flight regimes. Rotor fault identification, a technique that is somewhat similar to flight regime recognition, successfully used Kalman filters …
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Meanflow and turbulence measurements in the wake of a supersonic through-flow cascade
… interest in more efficient power plants for this flight regime. Cycle studies have shown that the turbofan engine equipped with a supersonic through-flow fan, capable of accepting supersonic axial flow from the inlet, has the potential to be very efficient at the supersonic cruise condition.
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Analysis of the dynamic stability derivatives for high angle of attack aircraft
… to fly and be controlled over a wide variety of flight conditions. In order to predict the aircraft behavior and control requirements over the entire flight regime it is necessary to have a proper aerodynamic model. Flight conditions at high angles of attack lead to separated flows making the …
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Modeling and Control of Dual-Motored Tail-Sitting Flying Wing Using a Fuzzy Logic Pid Controller
… before transitioning to forward, fixed-wing flight. Current flight controllers used in operation on hybrid VTOL aircraft rely on a control law state machine where given a pre-identified aircraft state, the controller enters a transitioning maneuver that takes the aircraft from a VTOL to fixed …
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Testing and development of a shrouded gas turbine engine in a freejet facility
… section providing the thrust in the supersonic regime exists. The combined cycle engine (CCE) could be incorporated into a variety of applications. The building of a new freejet facility and engine test rig at the Naval Postgraduate School enabled dynamic testing of the ongoing development of a …
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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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Folding Solid-Membrane Wing Structure for a Micro Air Vehicle
… Wind tunnel testing over the anticipated flight regime was also conducted to evaluate the L/D performance of the solid-membrane winged MAV model to that of a conventional solid winged MAV model. The results indicate the solid-membrane folding wing design has satisfactory aerodynamic …
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Hypersonic flight strategies for supersonic retropropulsion at Mars
… parachute systems. This work explores hypersonic flight strategies appropriate for use with supersonic retropropulsion systems at Mars. Optimal control techniques are used to determine hypersonic bank-angle profiles that achieve favorable supersonic retroprolusion ignition states. Bang-bang …
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New methodologies for onboard generation of Terminal Area Energy Management trajectories for autonomous reusable launch vehicles
… portion of the Terminal Area Energy Management flight regime to the AutoLanding Interface. Full coupling of the longitudinal and lateral aspects, as well as actual vehicle dynamic capabilities and constraints, will result in guidance outputs that are both realistic and flyable. Key technology …
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Robust Optimal Control of a Tailsitter UAV
… with the ability to achieve efficient horizontal flight. One type of tailsitter, the Quadrotor Biplane (QRBP), can transition the vehicle from hover as a quadrotor to horizontal flight as a biplane. The vehicle used in this thesis is a QRBP designed with special considerations for fully autonomous …
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A model-following digital control law for an EBF-STOL aircraft
… are linearized about a preselected point of the flight regime and written as linear state equations. A new system state vector is then constructed which includes the difference between plant and model states. The problem is formulated as a discrete linear regulator with the inputs to the model …
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Modeling and Approximation of Nonlinear Dynamics of Flapping Flight
… forces generate lift and drag during flapping flight regime. As a result, they play a significant role in the description of the physics that underlies such systems. In this research we focus on dynamic and kinematic models that govern the motion of ground based robots that emulate flapping …
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Software for Multidisciplinary Design Optimization of Truss-Braced Wing Aircraft with Deep Learning based Transonic Flutter Prediction Model
… configurations operating in the transonic flight regime. High-fidelity CFD simulation is performed to verify the result obtained from extended Strip theory based aerodynamic analysis method. An approach is presented to develop a deep neural network (DNN)-based surrogate model for fast and …
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Vibration Analysis Processes In Noisy Environments For thePurposes of Condition Based Maintenance and theSignificance of Regime Recognition
… signatures, as well as the importance of flight regime recognition. The plan for this research is to devise a way of extracting useful power train information from the test data in order to reduce the amount of "false alarms" while increasing the ability to detect faults for the last three …
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Unsteady Low Reynolds Number Aerodynamics of a Rotating Wing
… low Reynolds numbers O(10^4), and they share a flight regime with insects rather than conventional aircraft. The low Reynolds number regime is dominated by poor aerodynamic characteristics such as low lift-to-drag ratios. To overcome this, birds and insects utilize unsteady high lift mechanisms …
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Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation
… to predict the structural response in this flight regime. In this thesis, a high-fidelity computational approach is used to examine the fluid-structural response of aerospace structures in high-speed flows. The method is applied to two cases: one involving a fluid-thermal interaction problem …
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Unsteady Aerodynamic and Aeroelastic Analysis of Flapping Flight
… aerodynamic and aeroelastic analysis of flapping flight under various kinematics and flow parameters is presented in this dissertation. The main motivation for this study arises from the challenges facing the development of micro air vehicles. Micro air vehicles by requirement are compact with …
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Reduced-order modeling of non-Boltzmann thermochemistry and radiation for hypersonic flows
… time scales. The multi-physics nature of this flight regime renders the task of accurately estimating vehicular characteristics both theoretically and computationally challenging. The rapid dissipation of flow velocity into thermal energy in the post-shock region drives collisional-radiative …
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