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Overcoming design challenges of next-generation UASs

Next-generation unmanned air systems will require more performance and must integrate increasing capabilities for guidance control, weaponry, and surveillance—all in a very limited space. Read more at http://articles.sae.org/12546.

Posted in: News, Aerospace, Defense
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Heated air technology helps optimize CFRP assembly

Assembly of large and complex carbon-fiber-reinforced plastic (CFRP) components requires the use of liquid resin-based materials for applications such as shimming and aerodynamic sealing. These materials generally require curing times up to 12 h; heated air technology can reduce that time to 2 h. Read more at http://articles.sae.org/12510.

Posted in: News, Aerospace, Defense
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A holistic approach to aircraft assembly

It is the "automation and tooling partner" who offers a performance-based and advanced manufacturing systems integration approach that offers the next step-change, say Bombardier Aerospace and AIP Aerospace Odyssey. Read more at http://articles.sae.org/12568.

Posted in: News, Aerospace, Defense
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Formation and Characterization of Gold Nanoparticles

One-dimensional nanowires are of increasing interest due to their size, physical properties, and other applications in opto-electronics. For example, nanowires have already been used in light-emitting diodes and lasers, photo-detectors, resonant tunneling diodes, field-effect and single-electron transistors, and biochemical sensors. In addition, nanowires are useful because they can be grown almost dislocation-free due to their nano dimension. When dislocation- free nanowires nucleated on the substrate merge to form a continuous film, voids are left underneath, which act as sinks for dislocations, allowing other structures to be grown stress-free on top of the nano-engineered buffer layer.

Posted in: Briefs, Materials, Wiring, Nanomaterials
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Carbon Nanotube Thermal Interfaces Enhanced with Sprayed-On Nanoscale Polymer Coatings

As the semiconductor industry continually strives to increase the power density of single-chip packages, thermal management remains a critical challenge toward realizing both performance and reliability metrics. One of the primary bottlenecks inhibiting effective thermal management arises from the several interfaces that can exist between the chip and heat sink. Specifically, the thermal resistance of the thermal interface materials (TIMs) that are currently used to bridge these interfaces must be decreased. Carbon nanotubes (CNTs), with their extraordinarily high axial thermal conductivity, have generated tremendous interest as candidates for providing low-resistance TIMs. A potentially scalable and low-cost process was developed that utilizes spray coating to deposit thin polymer films onto the tips of CNTs for bonding at room temperature.

Posted in: Briefs, Materials, Coatings Colorants and Finishes, Nanotechnology, Polymers, Semiconductors
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Lipid Layer-Based Corrosion Monitoring on Metal Substrates

Corrosion is a deforming process that costs the United States Department of Defense (DOD) approximately $23 billion annually and accounts for 23% of all DOD maintenance. Exhaustive efforts have been made towards the detection and diagnosis of this issue; however, the problem persists. The Army’s “Go Green” initiative has opened the door for research into an environmentally friendly, biologically based corrosion monitoring technique. For this reason, novel research is being conducted on the use of lipid layers in corrosion monitoring.

Posted in: Briefs, Materials, Corrosion, Metals
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UPS Devices Keep UAVs in the Air

The simplistic definition of UAV reads like this:

“An unmanned aerial vehicle (UAV), colloquially known as a drone, is an aircraft without a human pilot on board. Its flight is controlled either autonomously by computers in the vehicle, or under the remote control of a pilot on the ground or in another vehicle.”

Posted in: Articles, Defense, Electronic equipment, Unmanned aerial vehicles
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Free Space Optical Communications System for Advancing Superiority on the Battlefield

Fixed and tactical information networking, especially for defense applications, has begun to require increasing data transmission capacity as the volume of information available to warfighters grows through more sophisticated sensors and capabilities. The breadth of the information grid is growing beyond the capacity of radio frequency (RF) or microwave broadband direct line of sight (DLoS) links. RF systems in particular are gridlocked by a congested spectrum, can be limited by licensing issues, and in hostile environments, can be jammed.

Posted in: Articles, Defense, Data acquisition and handling, Telecommunications
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The Influence of Material Processing on the Performance of Composite Parts

The production of composite parts relies on an ever increasing number of processing technologies which have a large impact on the performance of the part. The manufacturing step, or processing, is usually optimized for specific materials by using process simulation tools. Commonly used technologies are injection molding, injection-compression molding, compression molding, fiber draping or placement software. All of these approaches are applied in combination with short, long, and continuous fiber reinforced plastics for additional strength. Composite materials are heavily influenced by the processes used to create the part, which can lead to non-uniform material behavior throughout the final manufactured part, adding another challenge to the design process.

Posted in: Articles, Defense, Computer simulation, Composite materials, Fibers, Parts
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Kestrel Wide-Area Sensor Upgrades

In late May, Logos Technologies delivered the first payload upgrade to the Kestrel wide-area sensor, employed on U.S. Navy and Army aerostats in Afghanistan. The new hardware will provide better image stability, increased system reliability, and easier maintenance of Kestrel units already in the field.

Posted in: Application Briefs, Articles, Defense, Sensors and actuators, Surveillance, Maintainability and supportability, Military aircraft, Military vehicles and equipment
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