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 21 for “"AFRL"”.
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Analysis and modeling of phase noise in LOCSET and the AFRL high power fiber test bed
… compared to the phase noise measurements at the AFRL high power fiber test bed. Phase noise measurements from the AFRL high power fiber test bed are provided to support this research and these data are analyzed in both an open loop configuration and when the control loop is closed by LOCSET. The …
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Laser-induced heating, phase-shift, and damage : measurements and simulations
… between the Air Force Research Laboratory (AFRL) and the University of Texas at Austin to study laser induced thermal lensing. Analysis with a high-frame rate thermal camera system in an optical cuvette determined rates of heating and cooling in water exposed to 1200, 1310 and 1318-nm …
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Validation of the DRACO Particle-in-Cell Code using Busek 200W Hall Thruster Experimental Data
… analysis of the code using data from an AFRL experiment using a Busek 200 W Hall Thruster. DRACO is a PIC code that models particles kinematically while using finite differences schemes to solve the electric potential and field. The DRACO code has been recently modified to improve …
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Experimental Validation of a New Distributed Cooperative Control Algorithm for Multi-agent Systems with Switching Communication Topologies and Time-Delays
… Research Laboratory / Information Directorate (AFRL/RI)’s Machine Intelligence for Mission Focused Autonomy program. The research presented in this thesis was included in multiple presentations to AFRL program managers, who provided very favorable feedback to our research. Recently, some of our …
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Systems theoretic process analysis Applied to manned-unmanned teaming
The Air Force Research Laboratory (AFRL) has identified autonomy as one of three game changing technologies for the future, along with hypersonic vehicles and directed energy weapons. One common application of autonomy that has been explored by numerous laboratories and research centers …
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A Standalone High Frequency Receiver System
… by the Air Force Research Labora- tories (AFRL). The systems are calibrated to selected sites and thus require Radio Frequency Interference (RFI) characterization of the sites. The project includes building and using four standalone systems with associated power, antenna, RF, and remote …
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An Integrated Aerodynamic-Ramp-Injector/ Plasma-Torch-Igniter for Supersonic Combustion Applications with Hydrocarbon Fuels
… test rig at the Air Force Research Laboratories (AFRL). Experiments were performed at a static pressure and temperature of 0.25 atm and 131 K, and at injector-jet to freestream momentum flux ratios ranging from 1.0 to 3.3. Results showed the aero-ramp to mix at a considerably faster rate than the …
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Analysis of High Angle of Attack Maneuvers to Enhance Understanding of the Aerodynamics of Perching
… completed experimentally with 3D plates in the AFRL Horizontal Free Surface Water Tunnel (AFRL HFWT) again produce some three-dimensional instabilities not modeled in the 2D DVM. When comparing the impulsively started results, the DVM did not match the startup of the motion in the force …
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Design of a Scaled Flight Test Vehicle Including Linear Aeroelastic Effects
… A full-scale SensorCraft concept developed by AFRL and Boeing serves as the target model, and a 1/9th span geometrically scaled remotely piloted vehicle (RPV) serves as the initial design point. The aeroelastic response of the final design is verified against the response of the full-scale …
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Skin Friction Sensor Design Methodology and Validation for High-Speed, High-Enthalpy Flow Applications
… Tech (VT) and Air Force Research Laboratory (AFRL) further characterized the design vibrational effects and electromagnetic interference countermeasure effectiveness. Through iterations of past designs, sources of error have been identified, controlled, and minimized. The total uncertainty of …
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3D ICEPIC simulations of pulsed relativistic magnetron with transparent cathode : a comparative study with 3D MAGIC simulations
… developed at the Air Force Research Laboratory (AFRL) was used to simulate the A6 magnetron geometry with a transparent cathode. The results were compared with the work done at UNM to test the fidelity of the two simulation codes. Output parameters such as microwave power, microwave frequency, …
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LOCSET phase locking : operation, diagnostics, and applications
… technique developed and employed here are AFRL. The primary objectives of this effort are to detail the fundamental operation of the LOCSET phase locking technique, recognize the conditions in which the LOCSET control electronics optimally operate, demonstrate LOCSET phase locking with …
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System Design and Implementation of the Virginia Tech Optical Satellite Tracking Telescope
… research by the Air Force Research Lab (AFRL), ExoAnalytic Solutions, and other university level telescope projects. A holistic system design, including astronomy, image processing, and tracking methods, in a low-budget environment is considered. Method comparisons and results of the …
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Mission-Integrated Synthesis/Design Optimization of Aerospace Subsystems under Transient Conditions
… been implemented by the Air Force Research Lab (AFRL) and other Integrated Vehicle Energy Technology Demonstration (INVENT) contributors into a cohesive, adaptable, dynamic aircraft simulation program in Mathworks' Simulink®. The resulting model known as the "Tip-to-tail" model meets the design …
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Damage Detection Methodologies For Structural Health Monitoring of Thin-Walled Pressure Vessels
… study on the Air Force Research Laboratory (AFRL) Tank that is carried out in collaboration with NASA KSC and NASA MSFC is presented with preliminary results. Finally the results and interpretations of both studies are summarized and discussed.
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High Resolution Polarimetric Imaging Techniques for Space and Medical Applications
… support of the Air Force Research Laboratory (AFRL). Polarimetric signals have always played an important role in the identification, discrimination and analysis of a material's optical properties. This work presents a novel remote sensing approach based on polarimetric fractal detection …
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Enhanced combined effects in aluminized explosives by an innovative initiation system
… of large-scale tests noted by LLNL, AFRL, NSWC-IH, and others. This work identifies the challenges centered around the size effect and the incomplete modeling of aluminum reactions. In order to better quantify the performance improvements of this new initiator design, revisions to …
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Modeling and Control of SPIDER Satellite Components
… Research Laboratory Directed Energy Directorate (AFRL / DE), it is envisioned that a 1 m adaptive membrane optic is on the verge of becoming a reality.
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On the Challenges of integrating a Rotating Detonation Combustor with an Industrial Gas Turbine and important design considerations for Row-1 Blades
… developed by the Air Force Research Laboratory (AFRL) was scaled using a linear mass flow to area relationship, aiming to achieve a higher flow rate. The RDC was integrated with the NGVs through a non-optimized straight duct-type geometry with a diffuser cone. 3-Dimensional Numerical analyses …
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Physicochemical and performance study of next generation alternative jet fuels
… assigned by the Air Force Research Laboratory (AFRL) or other fuel testing information for fuels lacking a POSF designation. The multi-year AFJTD project continues to evolve, serving as a valuable resource to disseminate aviation data from development to end-use. With the data processed into a …
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