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<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>New NASA STI Report Series</title><link>http://www.sti.nasa.gov</link><description><![CDATA[Today's Listing of New NASA STI Report Series in the NASA Aeronautics and Space Database.]]></description><language>en-us</language><lastBuildDate>Wed, 16 May 2012 06:53:52 GMT</lastBuildDate><atom:link href="http://www.sti.nasa.gov/scan/rss99-02.xml" rel="self" type="application/rss+xml"/><image><title>New NASA STI Report Series</title><url>http://www.sti.nasa.gov/3Dmeatball.jpg</url><link>http://www.sti.nasa.gov</link></image><item><title>Composite Stress Rupture: A New Reliability Model Based on Strength Decay</title><link>http://ntrs.nasa.gov/search.jsp?R=20120008181</link><description><![CDATA[Abstract: A model is proposed to estimate reliability for stress rupture of composite overwrap pressure vessels (COPVs) and similar composite structures. This new reliability model is generated by assuming a strength degradation (or decay) over time. The model suggests that most of the strength decay occurs late in life. The strength decay model will be shown to predict a response similar to that predicted by a traditional reliability model for stress rupture based on tests at a single stress level. In...]]></description><pubDate>Tue, 15 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120008181</guid></item><item><title>HEART Aerothermodynamic Analysis</title><link>http://ntrs.nasa.gov/search.jsp?R=20120008176</link><description><![CDATA[Abstract: This paper presents an assessment of the aerothermodynamic environment around an 8.3 meter High Energy Atmospheric Reentry Test (HEART) vehicle. This study generated twelve nose shape configurations and compared their responses at the peak heating trajectory point against the baseline nose shape. The heat flux sensitivity to the angle of attack variations are also discussed. The possibility of a two-piece Thermal Protection System (TPS) design at the nose is also considered, as are the surfac...]]></description><pubDate>Tue, 15 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120008176</guid></item><item><title>Rotary-Wing Relevant Compressor Aero Research and Technology Development Activities at Glenn Research Center</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007423</link><description><![CDATA[Abstract: Technical challenges of compressors for future rotorcraft engines are driven by engine-level and component-level requirements. Cycle analyses are used to highlight the engine-level challenges for 3000, 7500, and 12000 SHP-class engines, which include retention of performance and stability margin at low corrected flows, and matching compressor type, axial-flow or centrifugal, to the low corrected flows and high temperatures in the aft stages. At the component level: power-to-weight and efficie...]]></description><pubDate>Fri, 04 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007423</guid></item><item><title>Assessment of Microphone Phased Array for Measuring Launch Vehicle Lift-off Acoustics</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007205</link><description><![CDATA[Abstract: The specific purpose of the present work was to demonstrate the suitability of a microphone phased array for launch acoustics applications via participation in selected firings of the Ares I Scale Model Acoustics Test. The Ares I Scale Model Acoustics Test is a part of the discontinued Constellation Program Ares I Project, but the basic understanding gained from this test is expected to help development of the Space Launch System vehicles. Correct identification of sources not only improves t...]]></description><pubDate>Wed, 02 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007205</guid></item><item><title>Development and Application of Benchmark Examples for Mixed-Mode I/II Quasi-Static Delamination Propagation Predictions</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007197</link><description><![CDATA[Abstract: The development of benchmark examples for quasi-static delamination propagation prediction is presented and demonstrated for a commercial code. The examples are based on finite element models of the Mixed-Mode Bending (MMB) specimen. The examples are independent of the analysis software used and allow the assessment of the automated delamination propagation prediction capability in commercial finite element codes based on the virtual crack closure technique (VCCT). First, quasi-static benchma...]]></description><pubDate>Wed, 02 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007197</guid></item><item><title>Nonlinear Dynamic Modeling and Controls Development for Supersonic Propulsion System Research</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007112</link><description><![CDATA[Abstract: This paper covers the propulsion system component modeling and controls development of an integrated nonlinear dynamic simulation for an inlet and engine that can be used for an overall vehicle  (APSE) model. The focus here is on developing a methodology for the propulsion model integration, which allows for controls design that prevents inlet instabilities and minimizes the thrust oscillation experienced by the vehicle. Limiting thrust oscillations will be critical to avoid exciting vehicle ...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007112</guid></item><item><title>COMPASS Final Report: Lunar Relay Satellite (LRS)</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007106</link><description><![CDATA[Abstract: The Lunar Relay Satellite (LRS) COllaborative Modeling and Parametric Assessment of Space Systems (COMPASS) session was tasked to design a satellite to orbit in an elliptical lunar polar orbit to provide relay communications between lunar South Pole assets and the Earth. The design included a complete master equipment list, power requirement list, configuration design, and brief risk assessment and cost analysis. The LRS is a half-TDRSS sized box spacecraft, which provides communications and ...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007106</guid></item><item><title>Implementation of an Integrated On-Board Aircraft Engine Diagnostic Architecture</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007104</link><description><![CDATA[Abstract: An on-board diagnostic architecture for aircraft turbofan engine performance trending, parameter estimation, and gas-path fault detection and isolation has been developed and evaluated in a simulation environment. The architecture incorporates two independent models: a realtime self-tuning performance model providing parameter estimates and a performance baseline model for diagnostic purposes reflecting long-term engine degradation trends. This architecture was evaluated using flight profiles...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007104</guid></item><item><title>Application of an Optimal Tuner Selection Approach for On-Board Self-Tuning Engine Models</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007101</link><description><![CDATA[Abstract: An enhanced design methodology for minimizing the error in on-line Kalman filter-based aircraft engine performance estimation applications is presented in this paper. It specific-ally addresses the under-determined estimation problem, in which there are more unknown parameters than available sensor measurements. This work builds upon an existing technique for systematically selecting a model tuning parameter vector of appropriate dimension to enable estimation by a Kalman filter, while minimi...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007101</guid></item><item><title>Modeled and Measured Dynamics of a Composite Beam with Periodically Varying Foam Core</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007100</link><description><![CDATA[Abstract: The dynamics of a sandwich beam with carbon fiber composite facesheets and foam core with periodic variations in material properties are studied. The purpose of the study is to compare finite element predictions with experimental measurements on fabricated beam specimens. For the study, three beams were fabricated: one with a compliant foam core, a second with a stiffer core, and a third with the two cores alternating down the length of the beam to create a periodic variation in properties. T...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007100</guid></item><item><title>Optical Frequency Optimization of a High Intensity Laser Power Beaming System Utilizing VMJ Photovoltaic Cells</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007096</link><description><![CDATA[Abstract: An effective form of wireless power transmission (WPT) has been developed to enable extended mission durations, increased coverage and added capabilities for both space and terrestrial applications that may benefit from optically delivered electrical energy. The high intensity laser power beaming (HILPB) system enables long range optical 'refueling" of electric platforms such as micro unmanned aerial vehicles (MUAV), airships, robotic exploration missions and spacecraft platforms. To further ...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007096</guid></item><item><title>Comparison of Square and Radial Geometries for High Intensity Laser Power Beaming Receivers</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007095</link><description><![CDATA[Abstract: In an effort to further advance a realizable form of wireless power transmission (WPT), high intensity laser power beaming (HILPB) has been developed for both space and terrestrial applications. Unique optical-to-electrical receivers are employed with near infrared (IR-A) continuous-wave (CW) semiconductor lasers to experimentally investigate the HILPB system. In this paper, parasitic feedback, uneven illumination and the implications of receiver array geometries are considered and experiment...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007095</guid></item><item><title>Methods for Computationally Efficient Structured CFD Simulations of Complex Turbomachinery Flows</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007094</link><description><![CDATA[Abstract: This research presents more efficient computational methods by which to perform multi-block structured Computational Fluid Dynamics (CFD) simulations of turbomachinery, thus facilitating higher-fidelity solutions of complicated geometries and their associated flows. This computational framework offers flexibility in allocating resources to balance process count and wall-clock computation time, while facilitating research interests of simulating axial compressor stall inception with more compl...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007094</guid></item><item><title>Wind Tunnel Testing of a One-Dimensional Laser Beam Scanning and Laser Sheet Approach to Shock Sensing</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007093</link><description><![CDATA[Abstract: A 15- by 15-cm supersonic wind tunnel application of a one-dimensional laser beam scanning approach to shock sensing is presented. The measurement system design allowed easy switching between a focused beam and a laser sheet mode for comparison purposes. The scanning results were compared to images from the tunnel Schlieren imaging system. The tests revealed detectable changes in the laser beam in the presence of shocks. The results lend support to the use of the one-dimensional scanning beam...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007093</guid></item><item><title>Evaluation of Advanced Stirling Convertor Net Heat Input Correlation Methods Using a Thermal Standard</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007092</link><description><![CDATA[Abstract: The U.S. Department of Energy (DOE) and Lockheed Martin Space Systems Company (LMSSC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system for space science missions. This generator would use two high-efficiency Advanced Stirling Convertors (ASCs), developed by Sunpower Inc. and NASA Glenn Research Center (GRC). The ASCs convert thermal energy from a radioisotope heat source into electricity. As part of ground testing of these ASCs, different oper...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007092</guid></item><item><title>A Computational Methodology for Simulating Thermal Loss Testing of the Advanced Stirling Convertor</title><link>http://ntrs.nasa.gov/search.jsp?R=20120007091</link><description><![CDATA[Abstract: The U.S. Department of Energy (DOE) and Lockheed Martin Space Systems Company (LMSSC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system for space science missions. This generator would use two highefficiency Advanced Stirling Convertors (ASCs), developed by Sunpower Inc. and NASA Glenn Research Center (GRC). The ASCs convert thermal energy from a radioisotope heat source into electricity. As part of ground testing of these ASCs, different opera...]]></description><pubDate>Tue, 01 May 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120007091</guid></item><item><title>Chronology of KSC and KSC Related Events for 2011</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006502</link><description><![CDATA[Abstract: This document is intended to serve as a record of KSC events and is a reference source for historian and other researchers. Arrangement is by day and month and individual articles are attributed to published sources. Materials were researched and compiled by the KSC Library Archivist for KSC Library Services Contractor, Abacus Technology Corporation.]]></description><pubDate>Thu, 26 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006502</guid></item><item><title>Analytical Round Robin for Elastic-Plastic Analysis of Surface Cracked Plates: Phase I Results</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006495</link><description><![CDATA[Abstract: An analytical round robin for the elastic-plastic analysis of surface cracks in flat plates was conducted with 15 participants. Experimental results from a surface crack tension test in 2219-T8 aluminum plate provided the basis for the inter-laboratory study (ILS). The study proceeded in a blind fashion given that the analysis methodology was not specified to the participants, and key experimental results were withheld. This approach allowed the ILS to serve as a current measure of the state ...]]></description><pubDate>Wed, 25 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006495</guid></item><item><title>UQTools: The Uncertainty Quantification Toolbox - Introduction and Tutorial</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006193</link><description><![CDATA[Abstract: UQTools is the short name for the Uncertainty Quantification Toolbox, a software package designed to efficiently quantify the impact of parametric uncertainty on engineering systems. UQTools is a MATLAB-based software package and was designed to be discipline independent, employing very generic representations of the system models and uncertainty. Specifically, UQTools accepts linear and nonlinear system models and permits arbitrary functional dependencies between the system s measures of int...]]></description><pubDate>Tue, 24 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006193</guid></item><item><title>An Exploratory Investigation of a Slotted, Natural-Laminar-Flow Airfoil</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006123</link><description><![CDATA[Abstract: A 15-percent-thick, slotted, natural-laminar-flow (SNLF) airfoil, the S103, for general aviation applications has been designed and analyzed theoretically and verified experimentally in the Langley Low-Turbulence Pressure Tunnel. The two primary objectives of high maximum lift and low profile drag have been achieved. The constraints on the pitching moment and the airfoil thickness have been satisfied. The airfoil exhibits a rapid stall, which does not meet the design goal. Comparisons of the ...]]></description><pubDate>Mon, 23 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006123</guid></item><item><title>Chronic Exposure to Moderately Elevated CO2 During Long-Duration Space Flight</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006045</link><description><![CDATA[Abstract: Out of operational necessity, space platforms function with ambient carbon dioxide (CO2) concentrations in excess of normal atmospheric conditions (0.03% or partial pressure of 0.23 mmHg). NASA's long-duration Spacecraft Maximum Allowable Concentration for CO2 is 0.7% (pp CO2 of 5.3mmHg). Extensive terrestrial studies support this level as safe and unlikely to cause adverse effects; however, International Space Station crews routinely report symptoms of acute CO2 toxicity (e.g., headaches, le...]]></description><pubDate>Mon, 23 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006045</guid></item><item><title>Use of Commercial Electrical, Electronic and Electromechanical (EEE) Parts in NASA's Commercial Crew Program (CCP)</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006039</link><description><![CDATA[Abstract: NASA's Commercial Crew and Cargo Program (CCP) is stimulating efforts within the private sector to develop and demonstrate safe, reliable, and cost-effective space transportation capabilities. One initiative involves investigating the use of commercial electronic parts. NASA's CCP asked the NASA Engineering and Safety Center (NESC) to collect data to help frame the technical, cost, and schedule risk trades associated with electrical, electronic and electromechanical (EEE) parts selection and ...]]></description><pubDate>Mon, 23 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006039</guid></item><item><title>Intelligent Systems Approach for Automated Identification of Individual Control Behavior of a Human Operator</title><link>http://ntrs.nasa.gov/search.jsp?R=20120006038</link><description><![CDATA[Abstract: Results have been obtained using conventional techniques to model the generic human operator?s control behavior, however little research has been done to identify an individual based on control behavior. The hypothesis investigated is that different operators exhibit different control behavior when performing a given control task. Two enhancements to existing human operator models, which allow personalization of the modeled control behavior, are presented. One enhancement accounts for the tes...]]></description><pubDate>Mon, 23 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120006038</guid></item><item><title>Enhancement of Aviation Fuel Thermal Stability Characterization Through Application of Ellipsometry</title><link>http://ntrs.nasa.gov/search.jsp?R=20120005439</link><description><![CDATA[Abstract: ASTM D3241/Jet Fuel Thermal Oxidation Tester (JFTOT) procedure, the standard method for testing thermal stability of conventional aviation turbine fuels is inherently limited due to the subjectivity in the color standard for tube deposit rating. Quantitative assessment of the physical characteristics of oxidative fuel deposits provides a more powerful method for comparing the thermal oxidation stability characteristics of fuels, especially in a research setting. We propose employing a Spectro...]]></description><pubDate>Thu, 19 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120005439</guid></item><item><title>Overview of Heat Addition and Efficiency Predictions for an Advanced Stirling Convertor</title><link>http://ntrs.nasa.gov/search.jsp?R=20120005390</link><description><![CDATA[Abstract: The U.S. Department of Energy (DOE) and Lockheed Martin Space Systems Company (LMSSC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system for space science missions. This generator would use two high-efficiency Advanced Stirling Convertors (ASCs), developed by Sunpower Inc. and NASA Glenn Research Center (GRC). The ASCs convert thermal energy from a radioisotope heat source into electricity. As part of ground testing of these ASCs, different oper...]]></description><pubDate>Thu, 19 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120005390</guid></item><item><title>Integrated Intermodal Passenger Transportation System</title><link>http://ntrs.nasa.gov/search.jsp?R=20120005350</link><description><![CDATA[Abstract: Modern transportation consists of many unique modes of travel. Each of these modes and their respective industries has evolved independently over time, forming a largely incoherent and inefficient overall transportation system. Travelers today are forced to spend unnecessary time and efforts planning a trip through varying modes of travel each with their own scheduling, pricing, and services; causing many travelers to simply rely on their relatively inefficient and expensive personal automobi...]]></description><pubDate>Thu, 19 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120005350</guid></item><item><title>Initial Investigation of the Acoustics of a Counter-Rotating Open Rotor Model with Historical Baseline Blades in a Low-Speed Wind Tunnel</title><link>http://ntrs.nasa.gov/search.jsp?R=20120005260</link><description><![CDATA[Abstract: A counter-rotating open rotor scale model was tested in the NASA Glenn Research Center 9- by 15-Foot Low-Speed Wind Tunnel (LSWT). This model used a historical baseline blade set with which modern blade designs will be compared against on an acoustic and aerodynamic performance basis. Different blade pitch angles simulating approach and takeoff conditions were tested, along with angle-of-attack configurations. A configuration was also tested in order to determine the acoustic effects of a pyl...]]></description><pubDate>Thu, 19 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120005260</guid></item><item><title>PIV Measurements of Supersonic Internally-Mixed Dual-Stream Jets</title><link>http://ntrs.nasa.gov/search.jsp?R=20120005193</link><description><![CDATA[Abstract: While externally mixed, or separate flow, nozzle systems are most common in high bypass-ratio aircraft, they are not as attractive for use in lower bypass-ratio systems and on aircraft that will fly supersonically. The noise of such propulsion systems is also dominated by jet noise, making the study and noise reduction of these exhaust systems very important, both for military aircraft and future civilian supersonic aircraft. This paper presents particle image velocimetry of internally mixed ...]]></description><pubDate>Thu, 19 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120005193</guid></item><item><title>Translation of Bernstein Coefficients Under an Affine Mapping of the Unit Interval</title><link>http://ntrs.nasa.gov/search.jsp?R=20120004305</link><description><![CDATA[Abstract: We derive an expression connecting the coefficients of a polynomial expanded in the Bernstein basis to the coefficients of an equivalent expansion of the polynomial under an affine mapping of the domain. The expression may be useful in the calculation of bounds for multi-variate polynomials.]]></description><pubDate>Thu, 19 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120004305</guid></item><item><title>Theoretical Consolidation of Acoustic Dissipation</title><link>http://ntrs.nasa.gov/search.jsp?R=20120004243</link><description><![CDATA[Abstract: In many engineering problems, the effects of dissipation can be extremely important. Dissipation can be represented by several parameters depending on the context and the models that are used. Some examples of dissipation-related parameters are damping ratio, viscosity, resistance, absorption coefficients, pressure drop, or damping rate. This Technical Memorandum (TM) describes the theoretical consolidation of the classic absorption coefficients with several other dissipation parameters inclu...]]></description><pubDate>Wed, 18 Apr 2012 00:00:00 GMT</pubDate><guid>http://ntrs.nasa.gov/search.jsp?R=20120004243</guid></item></channel></rss>

