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Application Briefs
Unmanned Systems

Vertical Take-Off and Landing UAV

The Air Force has announced that the MLB V-Bat Vertical Take-Off and Landing (VTOL) UAV from the MLB Company (Sunnyvale, CA) has been selected for a Phase II SBIR award. The military branch seeks a vehicle...

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Application Briefs
Defense

Fluorosilicones

A broad operating temperature range, fuel resistance and long-term reliability are some of the unique properties of fluorosilicones that make them useful in aerospace applications. To demonstrate their effectiveness, NuSil...

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Articles
Test & Measurement

An Advanced Circuit Protection Approach for RF Interfaces

One aspect that sets circuit protection for radio frequency (RF) apart from other types of applications is the range of frequencies in which RF circuits operate. With abbreviated...

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Briefs
Electronics & Computers

Microelectromechanical System (MEMS) Switch Test

Analyzing microelectromechanical system (MEMS) switch behavior is a new field of study that guides the production of MEMS switches. One issue of primary importance is the degradation of...

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Briefs
Manufacturing & Prototyping

Fabrication of Transparent Carbon Nanotube Films for OLED Applications

The process to prepare single-wall carbon nanotube (SWCNT) solutions with a good degree of dispersion of individually isolated SWCNTs and very thin SWCNT bundles was...

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Articles
RF & Microwave Electronics

Reliable EMI Shielding Materials and RF Cable Assemblies Ensure High Performance for Handheld Test Instruments

While high-performance test equipment has been used successfully in the laboratory for many years, the trend is moving toward...

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Briefs
Electronics & Computers

Magnetic Random Access Memory Integrated Passive Components

An embedded magnetic memory technology was developed to be integrated into a Complementary Metal Oxide Semiconductor (CMOS) circuit fabrication process to provide radiation-hard...

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Briefs
Electronics & Computers

Procedure to Determine and Correct for Transmission Line Resistances for Direct-Current, On-Wafer Measurements

Resistances of tenths of ohms to several ohms in transmission lines have been measured in laboratory systems from the power supply...

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Briefs
Electronics & Computers

Channel Field Effect Transistors

Narrow bandgap semiconductors offer high carrier mobilities and low contact resistances, while wide bandgap semiconductors offer high breakdown voltages. A series of heterojunction transistors has been investigated and proved to be effective for improving both speed and power output. These devices include double...

Briefs
Materials

Tomographic Electrical Resistance-Based Damage Sensing in Nano-Engineered Composite Structures

Advanced composite materials are increasingly replacing metals in the aerospace industry as they offer weight-saving improvements such as high...

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Briefs
Photonics/Optics

Computational Photonics in Laser Communications Through Clouds

This work explored the concept of creating a partially coherent laser beam consisting of an array of spatially overlapping or separated Gaussian beams with possible individual...

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Briefs
Mechanical & Fluid Systems

Designing a Sensorless Torque Estimator for Direct Torque Control of an Induction Motor

Induction motors often are the preferred choice among industrial motors due to the modern power electronics that improve their speed control. Vitally...

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Briefs
Electronics & Computers

Silicon Carbide Junction Field-Effect Transistor Devices for Scalable Solid-State Circuit Breakers

Power electronic converters functioning as components in high-power systems, such as those of hybrid military ground vehicles, require fast...

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Briefs
Physical Sciences

Characterizing Turbulent Wind Flow Near a Wind Barrier Using Sonic Anemometers

The Holloman High Speed Test Track (HHSTT) facility at Holloman Air Force Base (HAFB), NM, has a test section of 1.8 km that contains an artificial rain field...

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Briefs
Information Technology

Magneto-Fluid Dynamics Calculations for Aerodynamics

Governing differential equations, and algorithms to solve the equations numerically, have been developed to enable computational simulation of weakly ionized aerodynamic flows in the presence of electromagnetic fields. The equations and algorithms are intended mainly for application to...

Briefs
Physical Sciences

Mixing and Combustion in Turbulent, High-Speed Flows

A collection of reports presents a detailed description of a research program that focused on fundamental investigations of mixing and combustion in turbulent subsonic and supersonic flows like those encountered in high-speed air-breathing aircraft engines. The research included close...

Articles
RF & Microwave Electronics

Role and Performance of the Global Precipitation Measurement Microwave Imager Instrument

The Global Precipitation Measurement (GPM) mission will initiate a new era in precipitation measurement in terms of its global extent and frequency of...

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Briefs
Physical Sciences

Liquid-Crystal-Particle Thermometry and Velocimetry System

A three-dimensional (3D) defocusing liquid-crystal-particle thermometry and velocimetry (3DDLCPTV) system has been designed and constructed (but not yet operated) for use in...

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Briefs
Information Technology

Parametric Design of Three-Dimensional Hydrodynamic Shapes

A method of parametric design of bodies having arbitrary three- dimensional shapes has been invented. The method is intended mainly for use in the design, analysis, and manufacture...

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Briefs
Physical Sciences

System for Imaging Turbulent Combustion Flows

Asystem of scientific instrumentation and data-processing equipment has been assembled for research and education in turbulence, mixing, and chemical reactions (especially combustion) in...

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Briefs
Materials

Alloys for Nozzles of Hypersonic Wind Tunnels

Alloys are being developed for nozzles of hypersonic wind tunnels to be used in testing components of future hypersonic missiles, aircraft, and space transportation systems. The nozzle components...

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Briefs
Test & Measurement

Scaling of Flight Tests of Unmanned Air Vehicles

A program of research has addressed a methodology of scaling of flight tests of unmanned air vehicles (UAVs) intended primarily for military use in observing and/or attacking targets on the...

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Briefs
Mechanical & Fluid Systems

Some Advances in Reducing Drag and Suppressing Convection

Theoretical and computational research has yielded some advances in the art of designing active feedforward and feedback controllers to suppress thermal convection and reduce drag (by...

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Briefs
Mechanical & Fluid Systems

Simulations of Stall and Stall Control in Turbocompressors

Anumerical-simulation study of stall and stall control in radial and axial compressor stages of gas turbine engines has been performed. This and other similar studies are needed...

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Briefs
Information Technology

Application of CFD to a Slender-Bodied, Finned Projectile

In an application of computational fluid dynamics (CFD), flow fields about a slender-bodied finned projectile and the resulting aerodynamic forces and moments on the projectile were...

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Briefs
Software

Computational Model of a Plasma Actuator

Controlling subsonic aerodynamic flow through the use of plasma actuators is an active area of research in both the Air Force (AF) and the general scientific community. A typical plasma actuator...

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Briefs
Software

Rapid Model Fabrication for Responsive Aerodynamic Experimental Research

Technicians machine traditional metal wind tunnel models in a process that can span months. Although these models are highly precise, the meticulously slow...

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Briefs
Aerospace

Active Flow Control Demonstrated on “Airborne Wind Tunnel”

AFRL engineers, collaborating with aerospace manufacturers and other Air Force groups, recently demonstrated the first-ever airborne active flow control system when they...

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Briefs
Mechanical & Fluid Systems

A New Method for Determining Aeroballistic Parameters From Flight Data

Dr. Gregg Abate, an AFRL exchange engineer, developed a new method for determining aeroballistic parameters from projectile flight data. Assigned to the Fraunhofer...

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