http://www.ntis.gov/rss/RSSNTISCategoryList.aspxNational Technical Reports Libraryen(c) 2008, National Technical Information Service. All rights reserved.5http://www.ntis.gov/images/logoRSS.jpghttp://www.ntis.govConceptual design is the most fluid phase of aircraft design. It is important to be able to perform large scale design space exploration of candidate concepts that can achieve the design intent to avoid more costly configuration changes in later stag ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003231The aerodynamic design of a propeller for the trajectory control of a high-altitude, scientific balloon has been performed using theoretical methods developed especially for such applications. The methods are described. Optimum, nonlinear chord and t ...http://www.ntis.gov/search/product.aspx?ABBR=N20130000746This report summarizes recent progress made on the AVIATR contract Task Order 3, Condition Based Maintenance plus Structural Integrity (CBM+SI) - Basic Phase. The main objective of this task is to document the requirements for both CBM+ and the Aircr ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573734Aeroacoustic measurements of the 11 % scale full-span AMELIA CESTOL model with leading- and trailing-edge slot blowing circulation control (CCW) wing were obtained during a recent test in the Arnold Engineering Development Center 40- by 80-Ft. Wind T ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003179Fully resolved simulation data of flow separation over 2-D humps has been used to analyze the modeling terms in second-moment closures of the Reynolds-averaged Navier-Stokes equations. Existing models for the pressure-strain and dissipation terms hav ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003229Multiple metrics are applied to the design of a large civil tiltrotor, integrating minimum cost and minimum environmental impact. The design mission is passenger transport with similar range and capacity to a regional jet. Separate aircraft designs a ...http://www.ntis.gov/search/product.aspx?ABBR=N20130004306This report describes an approach for the assessment of upset resilience that is applicable to systems in general, including safety-critical, real-time systems. For this work, resilience is defined as the ability to preserve and restore service avail ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003333The DoD Inspector General (IG) conducted a review of the AlB for adherence to procedures set forth in Air Force Instruction (AFI) 51-503, 'Aerospace Accident Investigations.' This review was self-initiated and began on January 25, 2012. Our assessmen ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573745The main objective of this paper is to construct a turbulence model with a more reliable second equation simulating length scale. In the present paper, we assess the length scale equation based on Menter s modification to Rotta s two-equation model. ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003225System noise assessments of a state-of-the-art reference aircraft (similar to a Boeing 777-200ER with GE90-like turbofan engines) and several hybrid wing body (HWB) aircraft configurations were recently performed using NASA engine and aircraft system ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003187Interventions to maintain performance are necessary to meet demanding mission requirements during sustained and surge aviation operations. Tube foods are the only foods that can be consumed during a U-2 mission due to the confining and encapsulating ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573965Results presented at the Fifth Drag Prediction Workshop using CFL3D, FUN3D, and NSU3D are described. These are calculations on the workshop provided grids and drag adapted grids. The NSU3D results have been updated to reflect an improvement to skin f ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003235On August 5, 2012, the Mars Science Laboratory (MSL) entry capsule successfully entered Mars' atmosphere and landed the Curiosity rover in Gale Crater. The capsule used a reaction control system (RCS) consisting of four pairs of hydrazine thrusters t ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003218In this thesis, we designed, simulated, and analyzed a wireless communications system for an autonomous unmanned vehicle system. The system used for the design context is the Unmanned Vehicle (UV) Sentry, which is a system of autonomous unmanned vehi ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574501Correlation of wind tunnel results of a full-scale four-bladed hingeless rotor system with flight test measurements is presented. The results presented are from a recently completed full-scale rotor test in the NASA Ames 40-by 80-Foot Wind Tunnel and ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574188This journal is to assist Air Force software organizations identify, evaluate, and adopt technologies to improve the quality of their software products, efficiency in producing them, and their ability to accurately predict the cost and schedule of th ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574396The most significant output of the AFOSR funded research at design advance is our first commercial product CircuitSpace. It was developed after studying large scale real world layout problems such as UAV layout and PCB layout. The study resulted in c ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573709This paper describes the Advanced High Lift Leading Edge (AHLLE) task performed by Northrop Grumman Systems Corporation, Aerospace Systems (NGAS) for the NASA Subsonic Fixed Wing project in an effort to develop enabling high-lift technology for lamin ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003192In this paper, the use of polyimide foam as a lining in double panel applications is considered. It is being investigated here as a replacement for aircraft grade glass fiber and has a number of attractive functional attributes, not the least of whic ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003309Nonlinear parabolized stability equations and secondary instability analyses are used to provide a computational assessment of the potential use of the discrete roughness elements (DRE) technology for extending swept-wing natural laminar flow at chor ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003223A nonlinear simulation of the NASA Generic Transport Model was used to investigate the effects of errors in sensor measurements, mass properties, and aircraft geometry on the accuracy of dynamic models identified from flight data. Measurements from a ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003198Modern fighter/attack aircraft rely on vortex flow to increase lift at moderate to high angle of attack alpha. Therefore, a great deal of interest exists in understanding and predicting the vortical flow structure generated by swept wings. One form o ...http://www.ntis.gov/search/product.aspx?ABBR=ADA575009This paper presents the findings of a study conducted tn 2010 by the NASA Innovation Fund Award project entitled "Elastically Shaped Future Air Vehicle Concept". The study presents three themes in support of meeting national and global avia ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003180The future exploration of the Solar System will require innovations in transportation and the use of entry, descent, and landing (EDL) systems at many planetary landing sites. The cost of space missions has always been prohibitive, and using the natu ...http://www.ntis.gov/search/product.aspx?ABBR=N20130000775The tobacco hornworm hawkmoth (Manduca sexta) provides an excellent model from which to gather knowledge pertaining to the development of a Flapping Wing Micro Air Vehicle (FWMAV). One of the major challenges in design of a FWMAV is the energy demand ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574287Two approaches to function analysis and to function allocation were investigated. One function analysis approach ('Bottom-Up') extracted functions from a very detailed task time line (TTL) database. These were the functions that might have been imple ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574202We present first-year results from a two-year study on a novel, inexpensive, passive, wireless solution for performing nondestructive evaluation on the structural integrity of aging aircraft. Compact, frequency- selective, backscatter transponders ha ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574497We present second-year results from a two-year study on a novel, inexpensive, passive, wireless solution for performing nondestructive evaluation on the structural integrity of aging aircraft. Electro-mechanical resonant phenomena in barium strontium ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574498This paper presents the computational aeroelastic results generated in support of the first Aeroelastic Prediction Workshop for the Benchmark Supercritical Wing (BSCW) and the HIgh REynolds Number AeroStructural Dynamics (HIRENASD) configurations and ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003226This paper presents the approach and results for the Aeronautics Test Program (ATP) FY11 Facility Assessment Project. ATP commissioned assessments in FY07 and FY11 to aid in the understanding of the current condition and reliability of its facilities ...http://www.ntis.gov/search/product.aspx?ABBR=N20130004478The development of aerospace and aeronautics products typically requires three distinct types of testing resources across research, development, test, and evaluation: experimental ground testing, computational 'testing' and development, and flight te ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003315The aim of this Guidebook is to present the facts to consider prior to establishing an Unmanned Aerial System (UAS) Unit within emergency responder operations. This Guidebook was produced through a collaborative effort between Canadian and American l ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574146Hidden connections between regression models of wind tunnel strain-gage balance calibration data are investigated. These connections become visible whenever balance calibration data is supplied in its design format and both the Iterative and Non-Iter ...http://www.ntis.gov/search/product.aspx?ABBR=N20130001793An experimental investigation was performed to study the propulsion airframe aeroacoustic installation effects of a separate flow jet nozzle with a Hybrid Wing Body aircraft configuration where the engine is installed above the wing. Prior understand ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003185NASA is focused on technologies for combined cycle, air-breathing propulsion systems to enable reusable launch systems for access to space. Turbine Based Combined Cycle (TBCC) propulsion systems offer specific impulse (Isp) improvements over rocket-b ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003353Based on a review of the recent technical literature there is little question that a serious training gap exists for fifth-generation fighters, primarily arising from the need to provide their own red-air. There are several methods for reducing this ...http://www.ntis.gov/search/product.aspx?ABBR=N20130008629The purpose of the Conference was to bring together world leaders in aviation safety research, aircraft design and manufacturing, fleet operation and aviation maintenance to disseminate information on current practices and advanced technologies that ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573929Aerodynamic force and moment equations are developed for 6-DOF missile simulations of both the ascent phase of flight and a tumbling re-entry. The missile coordinate frame (M frame) and a frame parallel to the M frame were used for formulating the ae ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003336The military services, the Department of Defense, and the U.S. Congress have all expressed concern about the shortages of spare parts for aviation units and about the workarounds, including the cannibalization of parts, that are required to achieve r ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574317During the period between 1989 and 1998, NASA experienced what may have been its most productive decade ever. The Agency resumed human spaceflight after the 1986 Challenger accident, began constructing the International Space Station (ISS), launched ...http://www.ntis.gov/search/product.aspx?ABBR=PB2013108233During the period between 1989 and 1998, NASA experienced what may have been its most productive decade ever. The Agency resumed human spaceflight after the 1986 Challenger accident, began constructing the International Space Station (ISS), launched ...http://www.ntis.gov/search/product.aspx?ABBR=PB2013108232No abstract available. ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573754The National Transonic Facility (NTF) utilizes Inlet Guide Vanes (IGV) to provide precise, quick response Mach number control for the tunnel. During cryogenic operations, the massive IGV structure can experience large thermal gradients, measured as & ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003236Direct numerical simulations (DNS) are used to examine the pressure fluctuations generated by a Mach 6 turbulent boundary layer with nominal freestream Mach number of 6 and Reynolds number of Re(sub t) approx. =. 464. The emphasis is on comparing the ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003196Geometric modeling of aircraft during the Conceptual design phase is very different from that needed for the Preliminary or Detailed design phases. The Conceptual design phase is characterized by the rapid, multi-disciplinary analysis of many design ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003320NASA Glenn Research Center, in collaboration with GE Aviation, has begun the development of a smart adaptive structure system with piezoelectric (PE) transducers to improve composite fan blade damping at resonances. Traditional resonant damping appro ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003340The Aeroelastic Prediction Workshop brought together an international community of computational fluid dynamicists as a step in defining the state of the art in computational aeroelasticity. This workshop's technical focus was prediction of unsteady ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003239A method is presented for the in-flight optimization of the lift distribution across the wing for minimum drag of an aircraft in formation flight. The usual elliptical distribution that is optimal for a given wing with a given span is no longer optim ...http://www.ntis.gov/search/product.aspx?ABBR=N20130001676Active Flow Control (AFC) experiments performed at the Caltech Lucas Adaptive Wall Wind Tunnel on a 12%-thick, generic vertical tail model indicated that sweeping jets emanating from the trailing edge (TE) of the vertical stabilizer significantly inc ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003329A full-scale helicopter rotor test was conducted in the NASA Ames 80- by 120-Foot Wind Tunnel with a four-bladed S-76 rotor system. This wind tunnel test generated a unique and extensive data base covering a wide range of rotor shaft angles-of-attack ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574192The evolution of the role of flight simulation has reinforced assumptions in aviation that the degree of realism in a simulation system directly correlates to the training benefit, i.e., more fidelity is always better. The construct of fidelity has s ...http://www.ntis.gov/search/product.aspx?ABBR=N20130008649The National Aeronautics and Space Administration (NASA) manages a vast array of infrastructure assets across ten National Centers with a worth of at least 30 billion dollars. Eighty percent of this infrastructure is greater than 40 years old and is ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003314Food tube rations are a special customer order, limited production item used by U.S. Air Force pilots for through-the-mask feeding on demanding, long range, high altitude reconnaissance, surveillance, and intelligence collection missions. The aluminu ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574667This paper reviews five laser-induced fluorescence-based velocimetry techniques that have been used to study high-speed compressible flows at NASA Langley Research Center. The techniques discussed in this paper include nitric oxide (NO) molecular tag ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003190DoD utilized the Civil Reserve Air Fleet (CRAF) to help meet Operation Desert Shield/Storm requirements. Commercial carriers flew in excess of 4,700 missions in moving units, equipment, and resupply materiel. The call- up of aircraft proved particula ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574032Successful execution of the flight phase of the Superboom Caustic Analysis and Measurement Project (SCAMP) required accurate placement of focused sonic booms on an array of prepositioned ground sensors. While the array was spread over a 10,000-ft-lon ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003184A dual flow-path inlet for a turbine based combined cycle (TBCC) propulsion system is to be tested in order to evaluate methodologies for performing a controlled inlet mode transition. Prior to experimental testing, simulation models are used to test ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003365If properly selected, low-cost commercially available off-the-shelf light- and medium-fixed-wing aircraft are sufficient to effectively accomplish special operations aviation mission sets in support of special operations ground forces. As the nature ...http://www.ntis.gov/search/product.aspx?ABBR=ADA574784A graphical framework is used for statistical analysis of the results from an extensive N-version test of a collection of Reynolds-averaged Navier-Stokes computational fluid dynamics codes. The solutions were obtained by code developers and users fro ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003238NASA has created the Environmentally Responsible Aviation (ERA) Project to explore and document the feasibility, benefits and technical risk of advanced vehicle configurations and enabling technologies that will reduce the impact of aviation on the e ...http://www.ntis.gov/search/product.aspx?ABBR=N20130002630Results from the Fifth AIAA CFD Drag Prediction Workshop (DPW-V) are presented. As with past workshops, numerical calculations are performed using industry-relevant geometry, methodology, and test cases. This workshop focused on force/moment predicti ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003313As part of the Mars Science Laboratory (MSL) trajectory reconstruction effort at NASA Langley Research Center, free-flight aeroballistic experiments of instrumented MSL scale models was conducted at Aberdeen Proving Ground in Maryland. The models car ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003195Measurements of mean streamwise velocity, fluctuating streamwise velocity, and instantaneous streamwise velocity profiles in a hypersonic boundary layer were obtained over a 10-degree half-angle wedge model. A laser-induced fluorescence-based molecul ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003197The Navy needs to protect Destroyers (DDGs) from Unmanned Aerial Vehicle (UAV) attacks. The team, focus-ing on improving the DDG's defenses against small radar cross section UAVs making suicide attacks, estab-lished a DRM, identified current capabili ...http://www.ntis.gov/search/product.aspx?ABBR=ADA573999Computations are performed to study the flow past an isolated, spanwise symmetric roughness element in zero pressure gradient boundary layers at Mach 3.5 and 5.9, with an emphasis on roughness heights of less than 55 percent of the local boundary lay ...http://www.ntis.gov/search/product.aspx?ABBR=N20130003191