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Quantitative Real-Time Flow Visualization Technique

This technique enables real-time monitoring of pressure fields and flow measurement. John H. Glenn Research Center, Cleveland, Ohio There is a need for experimental techniques that have low cost and rapid turnaround. It is also necessary to obtain quantitative information from such a method. Previous methods are either lacking in quantitative information such as dye or smoke injection, or require considerable set-up and cost such as PIV (particle image velocimetry). A method was developed for visualizing the pressure contours for a turbine cascade in real time to enable rapid evaluation of new concepts. A method for quantitative 3D flow visualization also was developed.

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Thin-Film Evaporative Cooling for Side-Pumped Lasers

This technology has applications in advanced lidar systems for weather satellites; in welding, cutting, and marking; and in test and measurement. Langley Research Center, Hampton, Virginia A highly efficient way to cool solid-state crystal lasers was developed. This thin-film evaporative cooling technique offers higher optical efficiencies and monochromatic quality than traditional conductive cooling techniques. Developed for use in side-pumped 2.0- micron laser systems used in light detection and ranging (lidar) instruments, the thin-film cooling design concept also has broad utility for diode-pumped solid-state laser (DPSSL) systems, especially those with high heat flux or challenging packaging requirements.

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MEMS Micro-Translation Stage with Large Linear Travel Capability

Marshall Space Flight Center, Alabama A MEMS (microelectromechanical systems) micro-translation stage (MTS) with large linear travel capability was developed that uses capacitive electrostatic forces created by stators arranged linearly on both sides of a channel, and matching rotors on a moveable shuttle for precise movement of the shuttle. The device, which is essentially a linear motor built from silicon base with microfabrication techniques, will be able to rapidly translate across large distances using only three-phase power. The moveable shuttle can be as small as 100 mm and can house a variety of elements including lenses and mirrors. The shuttle can be tailored to travel distances as small as 10 mm and as large as 300 mm, with as little as 10 mm between adjacent shuttle stops.

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Planar and Non-Planar Multi-Bifurcating Stacked Radial Diffusing Valve Cages

This technology is applicable in systems and devices where high-pressure-differential valves are used. NASA’s Jet Propulsion Laboratory, Pasadena, California A valve cage consists of a stackable planar structure design with paths that are azimuthally cut out and connected radially. The pattern causes the flow to move azimuthally and impinge on each other when moving to the next path, thereby reducing the fluid momentum and energy that reduces the erosion capability. The maze-like structure is easy to machine with standard machining techniques.

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Real-Time Aerodynamic Parameter Estimation Without Airflow Angle Measurements

Langley Research Center, Hampton, Virginia Accurate measurements of airflow angles are among the most expensive and difficult to obtain in flight testing because of the complexity of the airflow near the aircraft and the consequent need to carefully mount and calibrate the sensors. A novel technique was developed for determining aerodynamic stability and control parameters from flight data in real time, without airflow angle measurements (airflow angle and sideslip angle).

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Method for Improving Control Systems with Normalized Adaptation by Optimal Control Modification

Ames Research Center, Moffett Field, California A new technology has been developed for improving performance and stability of control systems. This method represents a significant advancement in the state-of-the-art of adaptive control technology. The present invention is a new type of adaptive control law, called optimal control modification, which blends two control technologies together: optimal control and adaptive control.

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Airborne Coordinated Conflict Resolution and Detection (ACCoRD) Framework

This is a prototype implementation of a mathematical framework for state-based conflict detection and resolution algorithms. Langley Research Center, Hampton, Virginia To accommodate the predicted increase in air traffic, the next generation of air traffic management (ATM) systems relies on operational concepts where the responsibility for separation is distributed between airborne and ground systems. These distributed modes of operation are enabled by new positioning and communication technology that provides precise state information for ownship and traffic aircraft. A critical component of a distributed ATM system is the airborne conflict detection and resolution (CD&R) system. A CD&R system warns pilots about predicted traffic conflicts and advises them on resolution maneuvers.

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