Bio-inspired Airborne Infrastructure Reconfiguration (BioAIR)

Conventionally, most autonomous mobile nodes, including unmanned aerial vehicles (UAVs), are operated remotely by human operators. As such, forming a mobile communication network to connect several airborne or ground-based nodes with multiple remotely controlled UAVs can be prohibitively costly and very inefficient because many operators are needed. Furthermore, the operators need to control the deployed UAVs, while coordinating with others and monitoring the performance of the deployed communication network. Hence, a feasible solution must support collaborative communication, sensing and navigation. BioAIR offers a solution to this problem by enabling multiple UAVs to autonomously control themselves based on network performance.

Posted in: Articles, Aerospace, Communications, Defense, RF & Microwave Electronics, Attitude control, Communication protocols, Flight guidance systems, Personnel, Unmanned aerial vehicles

EMI Analysis Software Helps Telescope Group Simulate RFI Mitigation

Challenging Einstein’s seminal theory of relativity to the limits, how the very first stars and galaxies formed just after the Big Bang, the study of dark energy and the vast magnetic fields in the cosmos, and the age old question “Are we alone in the Universe?” – these are some of the key scientific goals of the Square Kilometer Array (SKA) project, led by the SKA Organization from Jodrell Bank Observatory in the UK, supported by 11 member countries: South Africa, Australia, Canada, China, Germany, India, Italy, New Zealand, Sweden, The Netherlands, and the United Kingdom.

Posted in: Articles, Aerospace, Defense, Antennas, RF & Microwave Electronics, Antennas, Computer software / hardware, Optics, Remote sensing

Communications Electronics Cooling Systems

Aspen Systems
Marlborough, MA

Aspen Systems are supplying Environmental Control Units (ECU’s) for critical communications electronics cooling for the Joint Light Tactical Vehicles (JLTV) being produced by Oshkosh Corporation. The first vehicle order under this contract was released by the Army on March 23, 2016 for 657 vehicles. The initial JLTV production contract calls for a delivery total of nearly 17,000 vehicles, while the total program is expected to result in over 50,000 JLTVs delivered to the US Military.

Posted in: Application Briefs, Communications, Defense, Electronics, Thermal Management, Electronic equipment, Telecommunications, Cooling

Advanced Simulation Technology

RGB Spectrum
Alameda, CA

The F-35 Joint Strike Fighter is the Department of Defense's next generation strike aircraft weapon system for the Navy, Air Force, Marines, and US allies. The fifth-generation fighter brings cutting-edge technologies to the battlespace of the future. On July 31, 2015, the first squadron was declared ready for deployment after training, an important part of which was accomplished with Lockheed Martin’s high-fidelity Full Mission Simulator (FMS). RGB Spectrum’s DGy™ recording and streaming codecs and multi-channel video servers are core components in the FMS.

Posted in: Application Briefs, Defense, Computer simulation, Aircraft

Airframe/Engine Seal Fire Test Facility

Trelleborg Sealing Solutions
Trelleborg Sweden
+46 410 670 00

Trelleborg Sealing Solutions has designed and built a new airframe/engine seal fire test facility located at its manufacturing facility in Northborough, Massachusetts in the U.S. This state-of-the-art fire test facility addresses aerospace manufacturers’ growing need to meet varyious fire test requirements in order to comply with industry and customer standards for vibration and air flow. Trelleborg is one of only a few seal manufacturers that deliver comprehensive in-house qualification testing, now including fireproof and fire resistance testing.

Posted in: Application Briefs, Defense, Airframes, Jet engines, Fire, Test facilities

Epitaxial Growth of Rhenium with Sputtering

Epitaxial superconducting films of refractory metals are a promising new template for single crystal tunnel barriers in Josephson junction quantum bit (qubit) devices. In existing Josephson junction qubits, it is believed that the widely-used amorphous AlOx tunnel barriers have undesirable two-state fluctuators. It is speculated that single-crystal tunnel barriers such as sapphire (α-Al2O3) may be free of such decoherence sources.

Posted in: Briefs, Aerospace, Defense, Materials, Computer software / hardware, Conductivity, Metals, Refractory materials

Processing and Characterization of Polycrystalline YAG (Yttrium Aluminum Garnet) Core-Clad Fibers

YAG-based fiber lasers could offer efficient operation at power levels beyond those achievable in current state-of-the-art silica-based fiber lasers if losses can be minimized. To address this, researchers have investigated creating both single-crystal and polycrystalline YAG fibers. Among the cases reported is the preparation of single-crystal YAG fibers using laser heated pedestal growth (LHPG), which resulted in fiber diameters of 400 μm and optical losses around 1–2 dB/m in the 1–3 μm wavelength range. Single-crystal YAG fibers with diameters of ~ 30 μm have even been reported.

Posted in: Briefs, Aerospace, Defense, Materials, Finite element analysis, Fiber optics, Lasers, Materials identification

Multi-Scale Analysis of Deformation and Failure in Polycrystalline Titanium Alloys Under High Strain Rates

Extensive use of titanium alloys in critical industrial and military applications, such as compressor blades of jet engines and armor of ground combat vehicles, has motivated researchers to understand, measure and tailor the mechanical properties of these alloys over a wide range of strain rates and temperatures. Of special interest has been the mechanical response of these alloys under high rates of deformation and failure under cyclic/dwell fatigue.

Posted in: Briefs, Aerospace, Defense, Materials, Aircraft structures, Body panels, Failure modes and effects analysis, Materials properties, Titanium alloys, Military vehicles and equipment

Abrasion Testing of Products Containing Nanomaterials

This SOP describes how to detect and quantify the release of nanoparticles from surface coatings into the air using a mechanical process that employs abrasion to simulate sanding. A material containing nanoparticles will be physically abraded and the materials released will be collected in a custom abrasion testing system. They will then be characterized by different methods such as Scanning Electron Microscopy (SEM) or Transmission Electron Microscopy (TEM) and other methods.

Posted in: Briefs, Aerospace, Defense, Materials, Microscopy, Nanomaterials, Wear, Test procedures

Spectrum Fatigue of 7075-T651 Aluminum Alloy Under Overloading and Underloading

Most structural members and machine components are subjected in service to cyclic loadings of varying amplitude. The variation in stress level follows either a regular or random pattern. The resulting crack growth is affected by the applied load sequence in the early stage (crack initiation) and in the later stage (crack propagation) of fatigue. The fatigue crack growth is known to be retarded by tensile overloads and accelerated by compressive overloads (underloads). However, the phenomenon and mechanism of the load sequence effects, especially those of overloading and underloading, on fatigue crack growth in different environments remain to be clarified.

Posted in: Briefs, Aerospace, Defense, Materials, Failure modes and effects analysis, Aluminum alloys, Fatigue