Aircraft Landing Noise Reduction Liners

The liners reduce aircraft noise that occurs during landing, helping aircraft comply with increasingly stringent airport noise restrictions.

NASA Langley Research Center has developed two new implementations of acoustic liners for aircraft noise reduction whereby curved channels within tight spaces can be outfitted to provide noise reduction. The two implementations are flap side edge liners and landing gear door liners for airframe noise reduction. In these applications, the acoustic liner is designed primarily to reduce aircraft noise that occurs during landing, which will help aircraft comply with increasingly stringent airport noise restrictions.

Posted in: Briefs, Aeronautics, Aerospace
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Corrosion-Inhibiting Self-Expanding Foam

This anti-corrosion, self-expanding foam is designed for use in hard-to-protect internal structures.

Surfaces such as metal and other corrodible surfaces are often exposed to extreme weathering, temperatures, moisture, impurities, and otherwise damaging external forces that accelerate corrosion. Conventional methods of corrosion protection include applying paints and other coatings, such as petroleum-based undercoatings, with a sprayer to the exposed surface. To be effective, the entire exposed surface must be covered or the corrosion process will be accelerated at the unprotected areas. While open-area surfaces may be easier to protect, those surfaces found in internal cavities within an overall framework can be more challenging to protect. Achieving full coverage on internal surfaces can be extremely difficult, and in some cases impossible without drilling several access openings in the structure. These extraneous openings can compromise the strength of the structure as well as create more entryways for water and debris. This increases the opportunity for corrosion to initiate at the edges of the openings.

Posted in: Briefs, Coatings & Adhesives, Materials
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Reusable Sponge Absorbs Oil from Entire Water Column

This sponge can be wrung out, the oil collected, and the material reused in oil spill and diesel cleanup situations.

When the Deepwater Horizon drilling pipe blew out seven years ago, beginning the worst oil spill in U.S. history, those in charge of the recovery discovered that the millions of gallons of oil bubbling from the sea floor weren’t all collecting on the surface where it could be skimmed or burned. Some of it was forming a plume and drifting under the surface of the ocean.

Posted in: Briefs, Materials
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Stop-Rotor Rotary Wing Aircraft

This aircraft eliminates the need for long runways or other large launch and recovery systems.

Some unmanned aircraft designs attempt to combine the vertical takeoff and landing (VTOL) and hover capabilities of a helicopter with the increased speed and range capabilities of fixed-wing airplanes. Stop-rotor “nose-sitter” configurations — so named because the aircraft takes off and lands from a nose-down orientation — may offer good hover efficiency and aerodynamic design, but can require complex mechanical systems. These designs can also suffer a significant loss in altitude during transition from helicopter to airplane mode, and involve uneven weight distributions, rendering the aircraft “top heavy” and unwieldy during takeoff and landing. Further, the counter-rotating fuselage and tail of some nose-sitter designs are less practical than aircraft designs with a conventional fuselage orientation and tail rotor. Tiltrotor configurations with tiltable rotating propellers also involve mechanically complex systems and decreased hover efficiency due to higher disk loading. “Tail-sitter” designs — so named because the aircraft takes off and lands from a tail-down orientation — are associated with poor hover efficiency due to high disk loading and an awkward 90-degree attitude change between hover and forward flight modes.

Posted in: Briefs, Aeronautics, Aerospace
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External Aircraft Noise Reduction Liners

This technology strategically places acoustic liners on the external surface of the aircraft to reduce such engine noise.

NASA Langley Research Center, in collaboration with Boeing and Lockheed Martin, has developed a new external acoustic liner for aircraft noise reduction. While the acoustic liner can be placed on any external aircraft surface, one attractive application is for open-rotor noise reduction. Airframe manufacturers are considering open rotor engines for future aircraft designs as they provide significant fuel savings. However, open rotor engines have no nacelle and thus, do not allow the use of conventional nacelle liners for noise abatement. This technology strategically places acoustic liners on the external surface of the aircraft to reduce such engine noise.

Posted in: Briefs, Aeronautics, Aerospace
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Silicon Nanoparticles Enable Energy-Collecting Windows

Photovoltaic cells are hidden in the window frame, blending invisibly into the built environment.

Technology that embeds silicon nanoparticles into efficient luminescent solar concentrators (LSCs) has been developed. The LSCs are the key element of windows that can efficiently collect solar energy. When light shines through the surface, the useful frequencies of light are trapped inside and concentrated to the edges, where small solar cells can be put in place to capture the energy.

Posted in: Briefs, Energy
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In-flight Global Nonlinear Aerodynamics Modeling and Simulation

Potential applications include aircraft, spacecraft, watercraft, and self-driving cars and trucks.

NASA's Langley Research Center has developed an in-flight global nonlinear aerodynamics modeling and simulation system. The technology replaces the normal labor-intensive iterative process of repeated flight tests and combining locally valid models with a single flight and automatically developed globally valid model. The technology is highly accurate and efficient for developing global aerodynamic and thrust models for aircraft.

Posted in: Briefs, Aeronautics, Aerospace
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Aqueous Solution Dispersement of Carbon Nanotubes

NASA’s Langley Research Center researchers have developed a novel method to disperse carbon nanotubes in aqueous solutions using chemical buffers. By avoiding the common use of surfactants to achieve dispersion, the researchers have provided a means to maintain biocompatibility of the carbon nanotubes, while also providing a means to functionalize the nanotube surfaces for specific biological and chemical activity. One particular example is the use of this approach to functionalize the surface with nano platinum catalysts to use as electrodes for fuel cells or biofuel cells. Additional surface functionality could provide use for biosensors or delivery of functionalized molecules for medical applications.

Posted in: Briefs, Materials
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Aircraft Deicing Decision Support Tool (DST)

Smooth and efficient operation of the National Airspace System depends on timely execution of flight-related events. Weather can severely disrupt the carefully planned flight schedules at a hub airport and impact travelers through out the country. In particular, a snowstorm may cause substantial perturbation in the departure of aircraft due to the need for deicing prior to takeoff. The additional time needed for an aircraft to be deiced, including time in queue, is highly nonlinear and difficult to predict.

Posted in: Briefs, Aeronautics, Aerospace
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Artificial “Wrist” Enables Design of Wearable Blood Pressure Monitors

This wearable device monitors blood pressure continuously, 24 hours a day.

Unfortunately, blood pressure (BP) measurements currently require the use of a cuff that temporarily stops blood flow. A wearable BP “watch” using today’s technology would squeeze the wrist every few minutes, making it impractical to use. A better method might gauge subtle pressure changes at the surface of the skin above one of the main wrist arteries — the radial artery — without regularly cutting off circulation. But before this new technology can be developed, there is a need to understand what the pressure inside a blood vessel looks like on the surface of the skin. This requires a physical model that can be used to test wearable devices in a laboratory.

Posted in: Briefs, Medical
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