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Pumped Two-Phase Cooling for Thermal Management of High Heat Flux Electronics

Pumped two-phase cooling provides a compact, low pumping power option for thermal management in high heat flux applications (300-500W/cm2). Compared to single-phase convection, significantly higher heat transfer coefficients can be achieved at substantially lower flowrates. Two-phase cooling also provides a high degree of isothermality, which is important in many applications such as lasers whose emission wavelengths are temperature-dependent.

Posted in: Articles, Aerospace, Defense, Materials, Electronic equipment, Thermal management, Coatings Colorants and Finishes
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Thermal Simulation and Testing of Expanded Metal Foils for Lightning Protection

With the implementation of major aircraft structures fabricated from carbon fiber reinforced plastic materials, lightning protection has become a more complicated issue for designers and engineers to solve.

Cracking of coatings and surface layers is evident on a variety of structures including buildings, automobiles, and aircraft. In some situations, the appearance of the coated or painted surface is degraded and the aesthetic appeal is lessened. However, in others, such as composite aircraft structures, paint cracking is both aesthetically undesirable and potentially deleterious from the electromagnetic effects aspect.

Posted in: Articles, Aerospace, Defense, Materials, Test & Measurement, Computer simulation, Coatings Colorants and Finishes, Composite materials, Lightning protection, Thermal testing
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Software Defined Radio Enables Flexible Communications for NASA

Communication is key to just about any endeavor. NASA’s ability to update and modify communication capabilities to reflect the latest upgrades without impacts to mission time or a trip back to Earth ensures optimal communication continues. In-orbit reconfiguration for spacecraft radios and systems, including those on the International Space Station, is the goal behind NASA’s Space Communications and Navigation (SCaN) Testbed.

From its invention until now, the radio has undergone some mighty technological advances. Conventional or legacy radios are not programmable; they are designed for one fixed configuration. They are built to produce a single waveform at a specified frequency. Conventional radios often also have limited tuning options and fixed data rates. While some conventional radios carry multiple types of data, they are incapable of adapting to new waveforms. To make changes on these legacy radios, the radio would physically need to be changed. Once a radio is out in space, that task becomes nearly impossible to accomplish. These limitations created a need for improved communication in space.

Posted in: Articles, Aerospace, Defense, Computer software / hardware, Radio equipment, Satellite communications, Test equipment and instrumentation
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Automated Testing of Advanced, High-Performance, Point-to-Multipoint Radio Systems

In 2008, 4RF Communications started development of a new range of radio products to augment their existing point-to-point, long-range wireless link product. Used by oil, gas, and utility companies for monitoring and control applications, the Aprisa SR is a point-to-multipoint Smart Supervisory Control and Data Acquisition (SCADA) radio operating in the 400 to 470-MHz licensed spectrum band with a 12.5-kHz channel size and narrowband 9.6-kbps capacity. The Aprisa SR is designed to address the key concerns facing the industry, such as the need for enhanced security, the need to efficiently handle the increasing complexity of SCADA networks, and the evolution to an IP-based and smart grid infrastructure.

Posted in: Articles, Aerospace, Defense, Radio equipment, Data acquisition
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Pictorial Representation Tool for First-Aid Training

Charles River Analytics
Cambridge, MA
617-491-3474
www.cra.com

Reducing combat fatalities demands quick and effective emergency care on the battlefield, and all soldiers are expected to provide immediate, basic care to themselves or their comrades. Critical first-aid procedures are described in the Soldier's Manual of Common Tasks, but recalling the procedures in stressful, life-threatening battlefield environments is challenging. In addition, each first-aid skill is composed of numerous, interrelated subtasks and processes. Successful accomplishment of the subtasks and processes depends heavily on an individual soldier's basic aptitude, underlying skills, and understanding of the task flow involved.

Posted in: Application Briefs, Aerospace, Defense, Imaging, Medical, health, and wellness, Education, Emergency management
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Tactical Fighting System Simulator

Environmental Tectonics Corporation
Southampton, PA
215-355-9100
www.etcusa.com

Most fighter aircraft simulators are fixed-base, with no motion or sustained G-capability. Even those with six degree of freedom (6-DOF) motion bases provide only motion cues and cannot replicate an authentic, sustained high-G environment. While providing useful training for cognitive tasks, and providing some workload and environmental stressors, the devices cannot present the complete spectrum of physical stresses inherent in actual flight operations. Thus, current simulator training cannot effectively reproduce live-aircraft training events such as Basic Fighter Maneuvers (BFM), Air-to-Ground Weapons Delivery, Close Air Support (CAS), Offensive/Defensive Counter Air (OCA & DCA), Carrier Qualification (CQ) Operations, Field Carrier Landing Practice (FCLP), and air refueling.

Posted in: Application Briefs, Aerospace, Defense, Computer simulation, Education, Military aircraft, Military vehicles and equipment
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Ultra-Light Prototype Vehicle

U.S. Army Tank Automotive Research, Development and Engineering Center (TARDEC)
Warren, MI
586-215-8763
tardec.army.mil

At the U.S. Army Tank Automotive Research, Development and Engineering Center (TARDEC), final testing is beginning on the Ultra Light Vehicle (ULV) Research Prototype platform.

Posted in: Application Briefs, Aerospace, Defense, Concept vehicles, Lightweighting, Military vehicles and equipment
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Electro-Optical Boresight Weapon System

Senso Optics
Yokneam, Israel
+972-4-993-5527
www.senso-optics.com

The combat effectiveness of a weapon system depends substantially on its hit probability. The most accurate aiming occurs when an optical device is aligned to the weapon’s bore centerline.

Posted in: Application Briefs, Aerospace, Defense, Electronic equipment, Optics, Military vehicles and equipment
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Power Management for the Electric Taxiing System Incorporating the More Electric Architecture

With airlines increasingly directing their attention to operating costs and environmental initiatives, the More Electric Architecture for Aircraft and Propulsion (MEAAP) is emerging as a viable solution for improved performance and ecofriendly aircraft operations. An electric taxiing system was developed that does not require the use of jet engines or the auxiliary power unit (APU) during taxiing, either from the departure gate to takeoff, or from landing to the arrival gate.

Posted in: Briefs, Aerospace, Defense, Electronics & Computers, Architecture, Power electronics, Electric drives
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Simultaneous Vibration Suppression and Energy Harvesting

The goal of this work was to investigate the concept of using harvested energy to directly control the vibration response of flexible aerospace systems. Small, lightweight, flexible micro air vehicles (MAVs) operate near flutter, providing both harvesting opportunities and vibration suppression requirements. The possibility that the ambient energy might be harnessed and recycled to provide energy to mitigate the vibrations through various control laws was investigated. The goal was to integrate harvesting, storage, control, and computation into one multifunctional structure.

Posted in: Briefs, Physical Sciences, Vibration, Unmanned aerial vehicles
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