Tech Briefs

Catalytic Oxidation of Organic Contaminants at Reduced Pressure

Marshall Space Flight Center, Alabama The current technology for catalytic oxidation of aqueous organic contaminants at elevated temperature and pressure works well at operating conditions of 265 °F and 70 psia with effluent TOCs (total organic carbon) of less than 0.5 ppm. However, it does not perform well at the reduced temperature, i.e., sub-water-boiling temperature (200 °F), and the reduced pressure such as ambient pressure (14.7 psia) as indicated by the effluent TOCs approximately the same as feed TOC.

Posted in: Briefs, Materials

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Approach for Achieving Flame Retardancy While Retaining Physical Properties in a Compatible Polymer Matrix

John F. Kennedy Space Center, Florida NASA’s Kennedy Space Center (KSC) seeks to license its Advanced Fire Retardant Materials to industry. KSC’s scientists have developed processes and know-how to impart fire retardancy to common polymers such as nylons, polyesters, and acrylics. NASA developed this technology for use in personnel protective systems for launch pad personnel engaged in hazardous materials (HAZMAT) operations. The invention provides polymer blends containing polyhydroxyamide and one or more flammable polymers. The polymer blends are flame-retardant and have improved durability and heat stability compared to the flammable polymer portion of the blends.

Posted in: Briefs, Materials

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Metal/Fiber Laminate and Fabrication Using a Porous Metal/Fiber Preform

This technology can be used in aeronautics, pressure vessels and storage tanks, ballistic protection, automotive structures, and composite doors and windows. Langley Research Center, Hampton, Virginia NASA’s Langley Research Center has developed a new technique to enable the preparation of metal/composite hybrid laminates, also known as fiber metal laminates (FML), by depositing metal directly onto fabric using a plasma deposition process. FMLs provide a useful combination of structural and functional properties for both aerospace and non-aerospace applications. Currently, FMLs are prepared in a compression process utilizing a press or autoclave with metallic layers (foils) sandwiched between layers of glass or graphite prepreg (preimpregnated fibers with a matrix resin). The NASA process deposits the metal on the fiber via plasma deposition. The porosity of the coated fabric allows for resin infusion.

Posted in: Briefs, Materials

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Tension Stiffened and Tendon Actuated Manipulator

This configuration offers mechanical advantage and improved efficiency over existing arms that use weighty gearboxes and motors. Langley Research Center, Hampton, Virginia NASA’s Langley Research Center is developing a robotic arm with lightweight joints that provide a wide range of motion. The envisioned design provides users with a long reach and numerous degrees of freedom. The arm, ideal for use in aquatic environments or for manipulation of light terrestrial loads, consists of articulating booms connected by antagonistic cable tension elements. The arm elements are structurally efficient and lightweight, and support compact packaging. The inherent mechanical advantage provided by the tendon articulation allows the use of small, efficient motor systems. The manipulator can be scaled over a large range from 10 m (load-bearing arm) to over 1000 m (submersible or float-supported arm). Current efforts are focusing on a 15-m prototype and a 300-m subsystem to test the unique robotic architecture. NASA is seeking partners to assist with the development of its concept system for specific applications.

Posted in: Briefs, Manufacturing & Prototyping

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Lattice Structures Coating Concept for Efficient Thermal Linking Beds

Marshall Space Flight Center, Alabama Conventional air revitalization technology for removal of CO2, moisture, and trace organic contaminants usually involves a packed bed of sorbent pellets that can be regenerated using a concept similar to that of pressure swing adsorption (PSA). Additional heat input for thermal regeneration is preferred during the adsorption-desorption process to increase the regeneration efficiency. Typically, a pair of adsorber modules consisting of the same sorbent material with identical loading capacity is placed in parallel and work in tandem, where one module adsorbs the contaminants from the process air while the other is in regeneration mode. The two adsorber modules have separate housings and may be placed in separate locations.

Posted in: Briefs, Manufacturing & Prototyping

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Lattice Structures Coating Concept for Efficient Thermal Linking Beds

Marshall Space Flight Center, Alabama Conventional air revitalization technology for removal of CO2, moisture, and trace organic contaminants usually involves a packed bed of sorbent pellets that can be regenerated using a concept similar to that of pressure swing adsorption (PSA). Additional heat input for thermal regeneration is preferred during the adsorption-desorption process to increase the regeneration efficiency. Typically, a pair of adsorber modules consisting of the same sorbent material with identical loading capacity is placed in parallel and work in tandem, where one module adsorbs the contaminants from the process air while the other is in regeneration mode. The two adsorber modules have separate housings and may be placed in separate locations.

Posted in: Briefs, Manufacturing & Prototyping

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A Statistically Based Approach to Broadband Liner Design and Assessment

The current method targets the entire broadband frequency spectrum simultaneously. Langley Research Center, Hampton, Virginia The broadband component of fan noise has grown in relevance with the utilization of increased bypass ratio and advanced fan designs. Thus, while the attenuation of fan tones remains paramount, the ability to simultaneously reduce broadband fan noise levels has become more attractive. Advanced manufacturing techniques have also opened new possibilities for the implementation of broadband liner concepts. This innovation is an integrated method for the design and evaluation of novel broadband acoustic liner concepts for complex engine configurations.

Posted in: Briefs, Manufacturing & Prototyping

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