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Showing 1 to 20 of 36 for “"Hypersonic vehicles"”.
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Adaptive control of hypersonic vehicles
The guidance, navigation and control of hypersonic vehicles are highly challenging tasks due to the fact that the dynamics of the airframe, propulsion system and structure are integrated and highly interactive. Such a coupling makes it difficult to model various components with a requisite degree …
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Robust intelligent flight control for hypersonic vehicles
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Air-data estimation for air-breathing hypersonic vehicles
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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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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Air data and surface pressure measurement for hypersonic vehicles
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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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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Adaptive control of hypersonic vehicles in presence of actuation uncertainties
… above are well suited for command tracking in hypersonic vehicles (HSV) in the presence of aerodynamic and center of gravity (CG) uncertainties. A model that accurately captures the effect of CG shifts on the longitudinal dynamics of the HSV is derived from first principles. Linearization of …
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Assessment of moving-mass actuators for hypersonic vehicles with deployable decelerators
… options for trajectory control in the hypersonic regime of planetary entry. Trajectory control is achieved by shifting the location of the center of gravity relative to the center of pressure to modify aerodynamic trim conditions. The vehicle is modeled as a cylinder with a deployable …
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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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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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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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Hypersonic test facilities: requirements analysis and preliminary design
… in recent years, a renewed interest in aerospace vehicles operating in the hypersonic regime. With this interest has come a need to not only reestablish the hypersonic test capability that was available in the 1960s but to enhance this capability to meet the demanding needs of today's proposed …
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Instrumentation and Control of a Novel Device to Simulate a Hypersonic Environment
<p>The hypersonic flow regime poses several challenges regarding the design of hypersonic vehicles. Among them is the massive energy and economic expense associated with ground- testing evaluation of material responses within this extreme environment. In order to provide a low-cost, rapid option …
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Investigation of Multi-Photon Excitation in Argon with Applications in Hypersonic Flow Diagnostics
… are essential for studying the physics of hypersonic flow wake regions. To advance the development of next generation hypersonic vehicles and to improve computational fluid dynamics techniques in the hypersonic regime, NASA needs a suitable non-intrusive diagnostic technique to measure …
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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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Guaranteed margins and performance for an adaptive flight control system and application on the X-15 research airplane
… flight systems, as in the case of hypersonic vehicles, make advanced control methods such as adaptive control increasingly attractive. The major obstacle in the widespread application of adaptive control to such applications is the lack of guarantees on performance and robustness. …
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Assessment of damage to thermal protection systems due to micrometeoroid and orbital debris impacts
Thermal protection systems for hypersonic vehicles are low- to zero-fault-tolerant. In order to understand the fault tolerance of this system, the number of impacts that cause mission failure due to micro-meteoroid and orbital debris damage is presented. This number differs based on the mission, so …
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Application of Ab-initio Quantum Chemistry Techniques to Hypersonic Flows for Plasma Blackout Alleviation
Plasma blackout in hypersonic flows produced by weakly-ionized air plasma sheaths is a phenomenon that attenuates or completely blocks communications with vehicles flying in a high-enthalpy flow environment. The ability to mitigate this issue can be useful from various re-entry vehicles to …
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Synthesis and indentation of boride and carbide coated carbon nanotube composite microstructures
… high mechanical resilience are needed, such as hypersonic vehicles.
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Experimental surface heat flux measurement in hypervelocity flows
… of heat transfer is integral to development of hypersonic vehicles. Underprediction of heat transfer rates can result in catastrophic failures during flight testing. An example which illustrates the importance of heat transfer during hypersonic flight is the destruction of the space shuttle …
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