Abstract:Small unmanned aerial systems (UAS) are a critical element in current military operations, and their use will increase substantially in the future. The propulsion system is a key design constraint in any UAS, and current small gas turbines for these vehicles are limited by the conventional… more
Abstract:Power system upgrades for next-generation ground combat vehicles require technology advances such as higher operating temperature, greater power density, and increased functionality. Silicon Carbide (SiC) based power electronic devices offer advantages over silicon devices, especially for high… more
Abstract:ABSTRACT: Current separable thermal mechanical interfaces (STMIs) found in advanced digital processing electronics are unable to efficiently remove dissipated heat from the active electronics, limiting electrical performance far below their capability. The standard approach produces high thermal… more
Abstract:ABSTRACT: The Air Force uses specially designed facilities to perform ground testing of infrared detector focal plane arrays at Arnold Engineering Development Center (AEDC). The current approach for cooling the detectors down to 8 K utilizes liquid helium. The systems to transport and store the… more
Abstract:Diode-Pumped Alkali Laser Systems (DPALS) have great potential for missile defense and other applications. Proper design of these systems is challenging because many interrelated processes impact their performance and critical kinetic rate coefficients are not well known. In response, our team… more
Abstract:ABSTRACT: The efficient, effective balancing of jet engine rotors and subassemblies continues to be a challenge for key aerospace applications. While manufacturing methods for balancing have improved significantly over the last ten years, measurement methods and procedures and fixturing have not… more
Abstract:ABSTRACT: Accurate determination of the distance between fastener holes and part edges is critical to ensure structural integrity in military aircraft. These measurements are particularly important as part flanges are reduced and tolerances are tightened to save weight and increase performance. … more
Abstract:Hybrid turboelectric aircraft with gas turbines driving electric generators connected to electric propulsion motors have the potential to transform the aircraft design space by decoupling power generation from propulsion. Resulting aircraft designs such as blended-wing bodies with distributed… more
Abstract:Modern aircraft gas turbine engines utilize highly loaded airfoils in both the compressor and turbine to maximize performance while minimizing weight, cost, and complexity. However, high airfoil loading increases the likelihood of flow separation at lower mass flow rates. Dielectric Barrier… more
Abstract:Refueling spacecraft in space offers tremendous benefits for increased spacecraft payload capacity and reduced launch cost. A key technology challenge for space refueling is the storage of liquid cryogenic fuel in space. To meet this need, we propose to develop a reliable, compact, efficient… more
Abstract:Future NASA space missions require advanced systems to convert thermal energy into electric power. These systems must be reliable, efficient, and lightweight. In response, we propose to develop a turbo-Brayton power converter with high efficiency and specific power. The converter will use gas… more
Abstract:NASA's future science missions to investigate the structure and evolution of the universe require efficient, very low temperature coolers for low noise detector systems. We propose to develop a highly efficient, lightweight Active Magnetic Regenerative Refrigeration (AMRR) system that can… more
Abstract:Creare and Virginia Polytechnic Institute and State University propose to design, develop, test, and deliver an ultra compact star tracker specifically intended for small satellites such as the CubeSat platform. Our design is based on proprietary "folded optics" technology previously… more
Abstract:NASA has recognized the need to develop new on-orbit analysis capabilities. This need arises because of the high cost associated with returning samples to Earth for analysis, the limited availability of crew time, and the relatively modest capabilities and interfaces of the existing hardware on the… more
Abstract:Future manned spacecraft and lunar or Mars outposts will need a condensing heat exchanger (CHX) to control humidity in the cabin atmosphere. Condensing surfaces must be hydrophilic to control the condensate flow and ensure efficient operation, and biocidal to prevent growth of microbes and… more
Abstract:Thermal and environmental control systems for future exploration spacecraft must meet challenging requirements for efficient operation and conservation of resources. Regenerative CO2 removal systems are attractive for these missions because they do not use consumable CO2 absorbers. However, these… more
Abstract:Interfaces on existing military chemical/biological protection garments are not designed to fully eliminate air gaps at fabric folds, fabric surfaces, or hook-and-loop closures, and thus do not provide a hermetic barrier against exposure. Creare proposes to develop a hermetic garment closure system… more
Abstract:Combustion stability is critical to the performance of augmented military jet engines. Instabilities such as screech can result in reduced augmentor performance, increased sustainment requirements, or even catastrophic failure. Screech remains a difficult problem to predict and mitigate, and its… more
Abstract:Safe efficient operations on the flight line or on the deck of an aircraft carrier require effective communications between members of the crew and between members of the crew and the aircraft pilot. Maintainers working on the flight deck or flight line are often subject to extremely loud noise… more
Abstract:The need to isolate mechanical shock and vibrations between shipboard machinery and the ship hull requires the use of flexible hose assemblies (FHAs) and resilient mounting structures. Resilient mounting structures and FHAs, in particular, are ubiquitous on all U.S. Navy ships, serving as a… more
Abstract:Cryogenic electronics have the potential to revolutionize digital communications from Unmanned Aerial Vehicles (UAVs), but must operate at cryogenic temperatures. Commercial cryocoolers are large and inefficient and are unable to meet size, weight, and power requirements for UAVs. Our approach and… more
Abstract:Aircraft carrier deck operations require a high degree of coordination to maximize efficiency and safety. The current operational paradigms have evolved over many decades of experience. However, the anticipated introduction of unmanned aerial vehicles (UAVs) and other automated systems are likely to… more
Abstract:The Army uses Unattended Ground Sensors (UGS) for the location and tracking of enemy soldiers and vehicles. The sensors can often determine range and relative bearing to the signal source, but without knowing its own orientation, these data cannot be converted to the geo location and ground track… more
Abstract:Measurement surveys of full-scale ship airwakes are needed to validate computational fluid dynamics (CFD) models of these wakes. Airwake computations guide the design of ship superstructures, improve the fidelity of flight simulators, and save time and reduce risk during flight tests to define… more
Abstract:Thermophotovoltaic (TPV) power systems offer an attractive approach for compact, simple, and reliable energy conversion needed in applications such as portable power systems and unmanned aerial vehicles. A key challenge with TPV energy systems is achieving a high-energy conversion efficiency, and… more
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