Manufacturing & Prototyping

Coaxial Propellant Injectors With Faceplate Annulus Control

These injectors are simpler and less expensive, relative to prior coaxial injectors.An improved design concept for coaxial propellant injectors for a rocket engine (or perhaps for a non-rocket combustion chamber) offers advantages of greater robustness, less complexity, fewer parts, lower cost, and less bulk, relative to prior injectors of equivalent functionality. This design concept is particularly well suited to small, tight-tolerance injectors, for which prior designs are not suitable because the practical implementation of those designs entails very high costs and difficulty in adhering to the tolerances.

Posted in: Manufacturing & Prototyping, Briefs

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Adaptable Diffraction Gratings With Wavefront Transformation

Better resolution and aberration control are possible with a dynamic refractive grating.Diffraction gratings are optical components with regular patterns of grooves, which angularly disperse incoming light by wavelength. Traditional diffraction gratings have static planar, concave, or convex surfaces. However, if they could be made so that they can change the surface curvature at will, then they would be able to focus on particular segments, self-calibrate, or perform fine adjustments.

Posted in: Manufacturing & Prototyping, Briefs, TSP

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Brushless DC Rotary Motor Improves Efficiency in Fuel Cell Applications

Design uses thin- walled stator to achieve high power density. The designers and manufacturers of fuel cells are continually striving to improve the efficiency of their products. A design challenge facing the engineer relates to reducing the power demands of the many electrical systems that support fuel cell operation. Blowers, compressors, and pumps are necessary for fuel pump operation, but are considered parasitic electrical loads. Since they require power from the fuel cell itself they impact overall system efficiency. To be truly effective in fuel cell applications, the motors used to drive the pumps must be lightweight, compact, and as efficient as possible in order to provide more energy for the intended application.

Posted in: Manufacturing & Prototyping, Briefs

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Preparation of Regular Specimens for Atom Probes

Single- or multiple-tip specimens can readily be prepared. A method of preparation of specimens of non-electropolishable materials for analysis by atom probes is being developed as a superior alternative to a prior method. In comparison with the prior method, the present method involves less processing time. Also, whereas the prior method yields irregularly shaped and sized specimens, the present developmental method offers the potential to prepare specimens of regular shape and size.

Posted in: Manufacturing & Prototyping, Briefs, TSP

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Wheel Design Verified With FEA Software

This paper examines an aluminum wheel design used with a run-flat tire called an extended mobility technology (EMT) tire, which can be safely driven without air for at least 80 km (50 miles). The setup of the finite element model of the wheel is discussed in detail, along with a parametric study of the inflation pressures and resulting stresses to verify that existing wheel designs could maintain the safety benefit of controlled handling and braking, even when the tire goes flat.

Posted in: Manufacturing & Prototyping, Briefs

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Constant-Differential-Pressure Two-Fluid Accumulator

An improved design does not rely on the spring rate of the accumulator tank.A two-fluid accumulator has been designed, built, and demonstrated to provide an acceptably close approximation to constant differential static pressure between two fluids over the full ranges of (1) accumulator stroke, (2) rates of flow of the fluids, and (3) common static pressure applied to the fluids. Prior differential-pressure two-fluid accumulators are generally not capable of maintaining acceptably close approximations to constant differential pressures.

Posted in: Manufacturing & Prototyping, Briefs

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Particle Distribution on Webs or Cloths

This technology provides the ability to uniformly distribute and attach particulate matter onto fibrous composite sheet or web materials.This technology provides a methodology and products that are formed from fibrous substrates or film-like surfaces by uniform impregnation with a particulate that is subsequently firmly attached. The extremely uniform distribution of the particulate is accomplished by 1) electrically charging a fibrous matrix with individual exposed surfaces to create a uniform distribution of charged sites; 2) applying particulates to this matrix so that particulates adhere at the charged sites; and 3) the particulates are attached to the individual fibers within the substrate by firm non-transient bonding.

Posted in: Bio-Medical, Manufacturing & Prototyping, Materials, Coatings & Adhesives, Medical, Briefs, MDB

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