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Posted in: Blog

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Actuated Ball-and-Socket Joints

These joints would be relatively compact, lightweight, simple, and inexpensive. The term "actuated ball-and-socket" (ABS) characterizes a proposed class of ball-and-socket joints that would incorporate ultrasonic motors and other piezoelectric actuators to generate multidimensional actuation. In some applications, ABS joints could supplant traditional joint-and-actuator assemblies that include passive rotary joints actuated by electromagnetic motors via gears. In comparison with such assemblies, ABS joints offer potential advantages of compactness, relative mechanical simplicity, higher torque-to-weight ratios, no backlash, self-braking with power turned off, and lower cost. ABS joints are expected to be particularly attractive for use as robot joints and as general low-power orienting actuators for diverse applications that could include robot hands, tools, and mechanisms for aiming scientific instruments.

Posted in: Mechanical Components, Briefs

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Software for Automated Ortho-Rectification of SAR Images

The Automated SAR Ortho-rectification Software System enables users of synthetic-aperture-radar (SAR) data to form processed images that are free of the distortion caused by the SAR imaging geometry and topography. The software consists of four modules:

Posted in: Software, Briefs

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Tech Needs of the Week

A company seeks technology for casting ophthalmic lenses with a refractive index of at least 1.67, and Abbe of at least 37. Operating parameters would be to cast lenses at ambient conditions with low odor. Thermal or radiation cure is acceptable for polymerization of lens material, with radiation cure preferred. Click here to respond to this Tech Need.

Posted in: Blog

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Evaluation of Exhaust Flows From Thrust-Vectoring Nozzles

A unique dual-flow cold-jet facility supports flight research programs. A unique dual-flow, cold-jet facility has been developed and operated by California Polytechnic State University (Cal Poly) at San Luis Obispo for NASA Dryden Flight Research Center. The facility supports flight research on thrust-vectoring nozzles and thrust-vector control systems. To date, the facility has completed tests on subscale nozzles of the F/A-18 High Alpha Research Vehicle (HARV), the X-31 airplane, and the F-15 Advanced Control Technology for Integrated Vehicles (ACTIVE).

Posted in: Physical Sciences, Briefs

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Laser Anemometer Measures Flow in a Centrifugal Compressor

High-resolution data are representative of flows in practical centrifugal compressors. Detailed measurements of complex flow fields within the NASA Low Speed Centrifugal Compressor (LSCC) have been acquired. The measurement data provide insight into the fundamental physics of flow in centrifugal compressors, and can be used to assess computational fluid dynamics codes and to develop flow-physics models. The resultant benefit is better predictive computational tools and shorter design cycle times.

Posted in: Mechanical Components, Briefs

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Portable Airborne Multispectral-Imaging System

This system can be put into operation almost anywhere on short notice. A portable instrumentation system that includes an airborne and a ground-based subsystem acquires multispectral image data over swaths of terrain ranging in width from about 1/2 to 1 km. The system was developed especially for use in surveying coastal environments; it is also well suited for performing remote sensing in connection with agriculture, aquaculture, forestry, environmental decontamination, and general environmental monitoring. The system can be stowed in two suitcase-size containers that can be transported as check-in luggage on a commercial airline. Once the system has been delivered to its destination and unstowed, the airborne subsystem can be launched over unprepared terrain and controlled from the ground-based subsystem, which can be operated from a minivan or a similarly sized vehicle.

Posted in: Tech Briefs, ptb catchall, Photonics, Briefs

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