Dynetics Inc. | Date: 2017-06-28
The disclosed methods and apparatus improve the fabrication of solid fibers and microstructures. In many embodiments, the fabrication is from gaseous, solid, semi-solid, liquid, critical, and supercritical mixtures using one or more low molar mass precursor(s), in combination with one or more high molar mass precursor(s). The methods and systems generally employ the thermal diffusion/Soret effect to concentrate the low molar mass precursor at a reaction zone, where the presence of the high molar mass precursor contributes to this concentration, and may also contribute to the reaction and insulate the reaction zone, thereby achieving higher fiber growth rates and/or reduced energy/heat expenditures together with reduced homogeneous nucleation. In some embodiments, the invention also relates to the permanent or semi-permanent recording and/or reading of information on or within fabricated fibers and microstructures. In some embodiments, the invention also relates to the fabrication of certain functionally-shaped fibers and microstructures. In some embodiments, the invention may also utilize laser beam profiling to enhance fiber and microstructure fabrication.
Crocker A.M.,Dynetics Inc.
Proceedings of the International Astronautical Congress, IAC | Year: 2016
The stated goals of NASA's Research Announcement for the Space Launch System (SLS) Advanced Booster Engineering Demonstration and/or Risk Reduction (ABEDRR) are to reduce risks leading to an affordable Advanced Booster that meets the evolved capabilities of SLS; and enable competition by mitigating targeted Advanced Booster risks to enhance SLS affordability. Dynetics, Inc. and Aerojet Rocketdyne (AR) formed a team to offer a wide-ranging set of risk reduction activities and full-scale, system-level demonstrations that support NASA's ABEDRR goals. Dynetics and AR offered a series of full-scale risk mitigation hardware demonstrations for an affordable booster approach that meets the evolved capabilities of the SLS. To establish a basis for the risk reduction activities, the Dynetics Team developed a booster design that takes advantage of the flight-proven ApolloSaturn F-1 to deliver 150 mT (331 klbm) payload to LEO, which enables a low-cost, robust approach to structural design. During the ABEDRR effort, the Dynetics Team has modified proven components and subsystems to improve affordability and reliability. The team has built hardware to validate production costs and tests to demonstrate it can meet performance requirements. State-of-the-art manufacturing and processing techniques have been applied to the heritage F-1, resulting in a low recurring cost engine while retaining the benefits of Apollo-era experience. NASA test facilities have been used to perform low-cost risk-reduction engine testing. Dynetics has also designed, developed, and built innovative tank and structure assemblies using friction stir welding to leverage recent NASA investments in manufacturing tools, facilities, and processes, significantly reducing development and recurring costs. A full-scale cryotank assembly was used to verify the structural design and prove affordable processes. Dynetics performed proof and cryothermal cycle tests on the assembly to verify it met performance requirements. During the contract, NASA and the Dynetics Team agreed to move work focused on an Oxidizer-Rich Staged Combustion (ORSC) cycle rocket engine under Dynetics' ABEDRR prime contract. The purpose of this risk reduction activity is to demonstrate combustion stability and measure performance of a 500,000 lbf thrust class main injector. To meet these objectives, the effort is focused on the design, analysis, fabrication, and test of a full scale ORSC main injector, Thrust Chamber Assembly (TCA), and supporting hardware. This paper will discuss the ABEDRR engine task and structures task achievements to date and the remaining effort through the end of the contract. Copyright © 2016 by International Astronautical Federation. All rights reserved.
Hack D.E.,Air Force Institute of Technology |
Hack D.E.,Dynetics Inc. |
Saville M.A.,Air Force Institute of Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011
This paper investigates the performance of single-channel SAR-GMTI systems in the focusing and detection of translating ground targets moving in the presence of a clutter background. Specifically, focusing and detection performance is investigated by applying the Moving Grid Processing (MGP) focusing technique to a scene containing an accelerating target moving in the presence of both uniform and correlated K-distributed clutter backgrounds. The increase in detection sensitivity resulting from the focusing operation is found to result from two separable effects, target focusing and clutter defocusing. While the detection sensitivity gain due to target focusing is common for both clutter types, the gain due to clutter defocusing is found to be significantly greater for textured clutter than for uniform clutter, by approximately 5 to 6 dB in the simulated scenario under consideration. This paper concludes with a discussion of the phenomenological causes for this difference and implications of this finding for single channel SAR-GMTI systems operating in heterogeneous clutter environments. © 2011 SPIE.
News Article | December 30, 2015
As part of the $19.3 billion allocated by Congress to NASA for the 2016 fiscal year budget, $55 million will go towards accelerated development of a habitation module for use in potential deep space missions. According to SpaceNews, the report states “NASA shall develop a prototype deep space habitation module within the advanced exploration systems program no later than 2018.” Further, the agency is required to provide Congress with a status update on the project within 180 days of the appropriation bill’s enactment. The $55 million will come out of the $350 million Exploration Research and Development line item in the budget. With the Orion Spacecraft, NASA hopes to send humans as far as Mars. However, the habitable volume of the crew capsule is only around 316 cubic ft. SpaceNews reports the agency has kept mum regarding the development of a habitation module. In March, the agency announced new partnerships with the commercial industry to advance studies and technology development in the realms of advanced propulsion, habitation, and small satellites. For the habitat component of its Next Space Technologies for Exploration Partnerships programs, the agency partnered with Bigelow Aerospace LLC, The Boeing Company, Dynetics Inc., Hamilton Sundstrand Space Systems International, Lockheed Martin Space Systems Company, Orbital ATK, and Orbital Technologies Corporation. The "habitat projects will have initial performance periods of up to 12 months, at a value of $400,000 to $1 million for the study and development efforts, and the potential for follow-on phases to be defined during the initial phase,” according to NASA. Sam Scimemi, the International Space Station director at NASA, told SpaceNews he hopes to test a habitation module in cislunar space in the late 2020s. Whether the building of the module will be farmed out to a commercial company or built internally remains to be seen.
Brady J.F.,Dynetics Inc.
Journal of the Acoustical Society of America | Year: 2013
Though widely used in steady-flow heat transfer applications, the Nusselt number-a dimensionless heat transfer coefficient-has not been studied as thoroughly in oscillating flows and is therefore not generally used in thermoacoustic applications. This paper presents expressions for the Nusselt numbers of laminar oscillating flows within the pores of stacks and regenerators, derived from thermoacoustic theory developed by Rott and Swift. These expressions are based on bulk (velocity-weighted, cross-sectionally averaged) temperature, rather than the cross-sectionally averaged temperature. Results are shown for parallel plates, circular pores, rectangular pores, and within the boundary layer limit. It is shown that bulk temperature does not become infinite during an acoustic cycle and that the Nusselt number is a complex constant at all times. In addition, steady-flow Nusselt numbers are recovered when velocity and temperature profiles are like those in steady flows. © 2013 Acoustical Society of America.
Humphrey C.M.,Dynetics Inc. |
Adams J.A.,Vanderbilt University
IEEE Transactions on Systems, Man, and Cybernetics Part A:Systems and Humans | Year: 2010
Prior results demonstrated that the general visualization abstraction (GVA) algorithm can perform information abstraction (i.e., selection and grouping) and determine how information items should be presented (i.e., size) while lowering workload and improving situational awareness and task performance. This paper presents results from a within-subject evaluation to ascertain the relative strengths and weaknesses of the GVA algorithm's components and associated learning effects. The results corroborate the previous results and demonstrate that the GVA algorithm's underlying subcomponent structural composition is beneficial. Furthermore, these results indicate that usage of the GVA algorithm requires some learning before the benefits are achieved. © 2006 IEEE.
Dynetics Inc. | Date: 2015-11-03
The disclosed materials, methods, and apparatus, provide novel ultra-high temperature materials (UHTM) in fibrous forms/structures; such fibrous materials can take various forms, such as individual filaments, short-shaped fiber, tows, ropes, wools, textiles, lattices, nano/microstructures, mesostructured materials, and sponge-like materials. At least four important classes of UHTM materials are disclosed in this invention: (1) carbon, doped-carbon and carbon alloy materials, (2) materials within the boron-carbon-nitride-X system, (3) materials within the silicon-carbon-nitride-X system, and (4) highly-refractory materials within the tantalum-hafnium-carbon-nitride-X and tantalum-hafnium-carbon-boron-nitride-X system. All of these material classes offer compounds/mixtures that melt or sublime at temperatures above 1800 C.and in some cases are among the highest melting point materials known (exceeding 3000 C.). In many embodiments, the synthesis/fabrication is from gaseous, solid, semi-solid, liquid, critical, and supercritical precursor mixtures using one or more low molar mass precursor(s), in combination with one or more high molar mass precursor(s). Methods for controlling the growth, composition, and structures of UHTM materials through control of the thermal diffusion region are disclosed.
Dynetics Inc. | Date: 2011-06-28
Computer security software, namely, software for determining the presence of malicious code on computers or whether hacking-type activities have been performed on a computer.
Dynetics Inc. | Date: 2014-05-20
Security products, namely radar, sensors, computing, and communications systems for detecting, communicating, and responding to restricted area breaches and incursions.
Dynetics Inc. | Date: 2016-04-07
Lightweight panels made from SiC, SiO2, or carbon fiber.