Special Coverage

Active Aircraft Pylon Noise Control System
Unmanned Aerial Systems Traffic Management
Method of Bonding Dissimilar Materials
Sonar Inspection Robot System
Applying the Dynamic Inertia Measurement Method to Full-Scale Aerospace Vehicles
Method and Apparatus for Measuring Surface Air Pressure
Fully Premixed, Low-Emission, High-Pressure, Multi-Fuel Burner
Self-Healing Wire Insulation
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Energy-Absorbing Beam Member

Potential applications include aircraft, rotorcraft, spacecraft re-entry vehicles, automobiles, and packaging containers.NASA’s Langley Research Center has developed a novel design for a lightweight energy absorbing (EA) composite subfloor structure. The technology’s primary application is to increase occupant survivability in the event of an aircraft crash. Current airframe subfloors unpredictably buckle, splay, and collapse under crash loads. This technology exploits the inherent stability associated with a conusoidal geometry and material combination of carbon and aramid fibers to allow the structure to bend and fold in a controlled manner at a particular load level.

Posted in: Briefs, Aeronautics, Aerospace

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Wet Active Chevron Nozzle for Controllable Jet Noise Reduction

The noise-reduction system makes use of injectors placed on the inside trailing edge of a jet engine nozzle.NASA’s Langley Research Center researchers have developed a novel noise reduction system for jet engines. Aircraft jet engine noise is a major issue for airports, the communities near airports, and, of course, for the jet engine designers. Even with the use of recent high-bypass-ratio jet engine designs, noise continues to be a major concern. The present innovation represents a significant advancement to the concept of using mechanically fixed chevrons on the trailing edge of jet engine nozzles to reduce noise. While the effect of chevrons on noise reduction is well known, commercial implementation has been limited. Unfortunately, the turbulence created with the chevrons, while useful for reducing noise upon takeoff, serves to reduce efficiency during cruising. The present innovation is a simple noise reduction system with effects similar to that of chevrons, yet it is active and controllable to maximize noise reduction while maintaining efficiency.

Posted in: Briefs, Aeronautics, Aerospace

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Improvements to the Functional Beamforming Formula

The purpose of this work is to improve the signal-to-noise ratio of acoustic measurements made in a wind tunnel with a microphone phased array. The functional beamforming method is improved to compensate for effects of acoustic propagation through turbulence, and to correct for inaccurate steering vectors. This increases the accuracy with which acoustic measurements can be made in a non-acoustic or acoustic wind tunnel.

Posted in: Briefs, Aeronautics, Aerospace

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Force Sensors in Robotic Design

From the operating room to the manufacturing floor, the robotic industry continues to grow and mature. As demand for robotic devices increases, so do the technology requirements.

Posted in: White Papers, White Papers, Machinery & Automation, Robotics, Data Acquisition, Sensors, Test & Measurement

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Enabling Small-Form-Factor, High-Capacity Small-Cell Platforms

There are about eight billion people who use cellphones to communicate, access social media, and upload and download videos and other content. This insatiable demand for connectivity and data will continue to increase. By 2020, and beyond, there could be a 1,000x increase in mobile data, which outpaces today's technology network capacity. The communication industry must determine how to scale networks to accommodate the increase in bandwidth demand for better security, power efficiency, reduced latency, and lower total cost of ownership. This paper discusses the options available to increase network capacity.

Posted in: White Papers, Communications, Electronics & Computers

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A New Paradigm in Turbulence Modeling for Aerodynamic Simulation

In Conjunction with SAEWhether for cars, trucks, aircraft, or wind turbines, aerodynamics is a critical aspect of improving energy efficiency. Aerodynamics is a complex science — calculations need to be performed with a high degree of precision and accuracy, since every 1 percent of change in aerodynamic drag or lift has enormous implications on machine performance. Aerodynamic simulation, therefore, requires accurate flow solvers, comprehensive turbulence models, and precise geometry handling.

Posted in: On-Demand Webinars, Aeronautics

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Glowing Crystals Cleanse Contaminated Drinking Water

Motivated by public hazards associated with contaminated sources of drinking water, a group of scientists has successfully developed and tested tiny, glowing crystals that detect and trap heavy-metal toxins like mercury and lead.

Posted in: News

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