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Minimally Intrusive Thin-Film Electrical Insulation on Conductive Surfaces

This innovation can be used to insulate conductive substrates prior to applying thin-film sensors such as strain gauges and thermocouples.The use of thin-film sensors has several advantages over wire or foil sensors. For example, thin-film sensors do not require special machining of the components on which they are mounted, and, with thicknesses less than 10 μm, they are considerably thinner than wires or foils. The thin-film sensors are thus much less disturbing to the operating environment, and have a minimal impact on the physical characteristics of the supporting component.

Posted in: Briefs, Sensors

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Pulsed Ultrasonic Stir Welding System

A solid-state weld process yields better joint quality and longer tool life.NASA’s Marshall Space Flight Center (MSFC) developed Ultrasonic Stir Welding (USW) to join large pieces of very high-strength metals such as titanium and Inconel. USW, a solid-state weld process, improves current thermal stir welding processes by adding high-power ultrasonic (HPU) energy at 20-kHz frequency. The addition of ultrasonic energy significantly reduces axial, frictional, and shear forces; increases travel rates; and reduces wear on the stir rod, which results in extended stir rod life. The USW process decouples the heating, stirring, and forging elements found in the friction stir welding process, allowing for independent control of each process element and, ultimately, greater process control and repeatability. Because of the independent control of USW process elements, closed-loop temperature control can be integrated into the system so that a constant weld nugget temperature can be maintained during welding.

Posted in: Briefs, Manufacturing & Prototyping

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Method of Heat Treating Aluminum-Lithium Alloy to Improve Formability

This technology can be used in aerospace, recreation, transportation, and other industries where high-strength, lightweight structures are needed.NASA scientists have designed a novel heat treatment process that significantly improves the formability of high-performance aluminum-lithium (Al-Li) 2195 alloy plate stock. The heat treatment process dramatically reduces cracking and also improves the yield and range of product sizes/shapes that can be spin/stretch formed. The improved yields also provide lower costs.

Posted in: Briefs, Manufacturing & Prototyping

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Impact Tester Device

This lightweight instrument is used for investigating structural response.NASA’s Langley Research Center has developed a portable device to simulate low-velocity impacts on a material or structure. As composite materials are highly susceptible to damage caused by low-velocity impact, they must be designed and evaluated for structural integrity after these types of impacts. The NASA impactor’s design comprises an exterior tube, an instrumented projectile, a spring to propel the projectile, a spring compression device, a release pin, a wooden spacer/locator block, and an optical sensor. The tube can be handheld or rigidly mounted at any angle such that the impact response can be evaluated at specific positions on the test article. In the current configuration, impact energies between 4 and 40 J (between about 3 and 30 ft.-lbs.) can be obtained. Researchers designed a fully functioning prototype for the NASA Engineering and Safety Centers (NESCs) Composite Crew Module (CCM) program for damage tolerance testing. Both the impact force history and projectile velocity are captured during operation.

Posted in: Briefs, Manufacturing & Prototyping

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Scalable and Tileable Aggregate Low-Level Summary Display for Deep Space Network Link Control Tasks

This innovation features critical pieces of information in a single display.The Deep Space Network (DSN) is a collection of three sites around the globe. The positioning of the sites, 120° longitude apart, allows at least one site to see every patch of sky at all times, thus facilitating continuous coverage for any deep space spacecraft that partners with the DSN.

Posted in: Briefs, Software

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Mission Service Architecture Framework (MSAF)

MSAF provides a common framework for designing a Mission Operations System (MOS) based on a control systems paradigm.The representation of mission operations systems (MOS) has been unique to each mission, although there are many common concerns that need to be addressed. A consistent approach and language are needed for representing mission operations systems. The Mission Service Architecture Framework (MSAF) is a foundational extension of SysML and BPMN that provides stereotypes, relationships, and architectural system views that are used to describe mission operations systems.

Posted in: Briefs, Software

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Study of Formulating Conserved Scalar Equations for Turbulent Reactive Flows with General Species Mass- Diffusion Coefficients for Utilization in Flamelet Models

The modeling of turbulent reactive flows is a subject of contemporary research. Current turbulent-reaction models cannot account for realistic complexities such as distinct species mass-diffusion coefficients. Under the assumption of a single, constant, mass-diffusion coefficient, a conserved-scalar equation is typically derived in turbulent reactive flows by taking the difference between chemical-species conservation equations having opposite reaction rates (in the sense that the reactant has an opposite reaction rate to the product), thereby creating an equation devoid of reaction terms. Assuming the reaction regions are very thin and are merely contorted by turbulence, chemistry and turbulence can be decoupled, and the evolving statistics of the conserved scalar describe the reaction progression. No such equation has yet been derived for distinct mass-diffusion coefficient cases where the single coefficient is now replaced by a full matrix. Considering that mass diffusion is responsible for reactants approaching at the molecular level and for reaction initiation, this lack of mathematical framework is very disturbing.

Posted in: Briefs, Software

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