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 26 for “"Hypersonic Vehicle"”.
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Adaptive control of a generic hypersonic vehicle
… to the Road Runner six-degree-of-freedom generic hypersonic vehicle model. Uncertainty in control effectiveness, longitudinal center of gravity location, and aerodynamic coefficients are introduced in the model, as well as sensor bias and noise, and input time delays. The performance of the …
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Asymptotic analysis of hypersonic vehicle dynamics along entry trajectory
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Control-oriented Modeling of an Air-breathing Hypersonic Vehicle
… costs. The size of a typical air-breathing hypersonic vehicle can vary anywhere between 12 ft, like the NASA X-43A, to 100 ft, like the NASP demonstrator vehicle. On the other hand, the performance expectations can vary anywhere between cruising at Mach 5 @ 85; 000 ft to Mach 10 @ 110; 000 …
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Control Design for a Non-Minimum Phase Hypersonic Vehicle Model
Air-breathing hypersonic vehicles are emerging as a method for cost-efficient access to space. Great strides have recently been made in the field of hypersonic vehicles, however the unique dynamics of the vehicles present challenges for control design. In this thesis, a nonlinear controller for a …
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Reentry dynamics and handling qualities of a generic hypersonic vehicle
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Application of hypersonic vehicle flying qualities criteria and computational considerations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Creation of a Trimmed Powered Aerodynamic Database for a Generic Hypersonic Vehicle
… powered database for a generic airbreathing hypersonic vehicle. The database was created using the cartesian flow solver Cart3D. Propulsion effects were coupled to the airframe and inlet by using conditions at the inlet of the combustor to determine conditions at the exit of the combustor. …
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Exergy Methods for the Generic Analysis and Optimization of Hypersonic Vehicle Concepts
… dynamic, integrated aerospace systems such as hypersonic vehicle concepts. In particular, an exergy-based methodology is compared to a more traditional based measure by applying both to the synthesis/design and operational optimization of a hypersonic vehicle configuration comprised of an …
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Direct Adaptive Control for Stability and Command Augmentation System of an Air-Breathing Hypersonic Vehicle
… 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 non-minimum phase behavior. It …
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Evaluation of Various Energy Storage Options for the Internal Thermal Loads of a Non-Airbreathing Hypersonic Vehicle
Energy storage within hypersonic aircraft is becoming increasingly important with the development of more sophisticated electronic components and is an integral piece of expanding their overall capabilities. Hypersonics not only produce large external thermal loads, but also an abundance of …
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ZrB2-SiC Based Ultra High Temperature Ceramic Composites: Mechanical Performance and Measurement and Design of Thermal Residual Stresses for Hypersonic Vehicle Applications
… materials for leading edges and nose cones in hypersonic air breathing vehicles. Mechanical performance of ceramic composites play an important role in the ultra-high temperature applications, therefore SiC is added to ZrB2 as a strengthening phase to enhance its mechanical performance. The …
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Exergy Methods for the Mission-Level Analysis and Optimization of Generic Hypersonic Vehicles
Though the field of hypersonic vehicle design is thriving again, few studies to date demonstrate the technology through a mission in which multiple flight conditions and constraints are encountered. This is likely due to the highly integrated and sensitive nature of hypersonic vehicle components. …
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A multi-loop guidance scheme using singular perturbation and linear quadratic regulator techniques simultaneously
… pitch control algorithm for a generic aerospace vehicle is presented. This design methodology is facilitated by a time scale separation observed in the dynamical system. Two variations of this algorithm are considered, with features and drawbacks of both evaluated. The algorithm is then tested by …
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Advanced Synthesis of Ultra-High Temperature Ceramics (UHTCs) and High Temperature Electron Emitting Materials
… aircraft to next generation weapons, achieving hypersonic speed is becoming increasingly important across a range of research domains. The immense challenge associated with this goal involves the development of suitable materials and systems for the different components of a hypersonic vehicle, …
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Reaction Control Jet Actuators for Air-Breathing Hypersonic Vehicles
Air-breathing hypersonic vehicles have an engine which is tightly integrated with the airframe. This integration leads to complex dynamic characteristics, such as propulsion-pitch coupling. As a result, air-breathing hypersonic vehicles tend to be unstable and high frequency control is required to …
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Surrogate Neural Networks for Efficient Simulation-based Trajectory Planning Optimization
… the optimal reference trajectory for landing a hypersonic vehicle. In contrast to the large datasets used to create the surrogate models in the prior literature, our methodology is specifically designed to minimize the number of simulation executions required by the gradient descent optimizer. …
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System Identification CFD-Based Reduced-Order Modeling for Hypersonic Vehicles
… for estimating the aerodynamic coefficients of a hypersonic vehicle subjected to flight conditions of interest. The reduced-order models combined the accuracy of high-fidelity hybrid Reynolds Averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) computational fluid dynamic (CFD) models …
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Design and Performance of a Communications System for a Low-Cost High Altitude Balloon Platform for Troposphere and Stratosphere Research
… significant operational issues concerning hypersonic vehicle aerothermodynamics, boundary layer stability, and aero-optical propagation. In situ turbulence measurements along with modeling will quantify spatiotemporal statistics and the dependence of stratospheric turbulence on underlying …
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Study of hypersonic aerodynamics using free flight experiments
… (AEDB) documents the forces acting on a flight vehicle over its design range of attitudes and flight conditions. It is critical for calculating stability and designing control algorithms. Today, most hypersonic vehicle AEDBs are created numerically and validated with force balance measurements …
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