NASA - National Aeronautics and Space Administration (NASA): Recent submissions

Now showing items 761-780 of 3613

    • NACA-TN-3487 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1955
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Subsonic and supersonic flow of air past rectangular cavities cut into a flat surface were studied. The cavities were found to emit a strong acoustic radiation. These acoustic fields were investigated by means of schlieren ...

    • NASA-RP-1181 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1987
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: New, improved curve fits for the thermodynamic properties of equilibrium air have been developed. The curve fits are for pressure, speed of sound, temperature, entropy, enthalpy, density, and internal energy. These curve ...
      Subject(s) : AIR , APPROXIMATION , COMPUTATIONAL FLUID DYNAMICS , CURVE FITTING , ENTHALPY , ENTROPY , EQUILIBRIUM FLOW , HYPERSONIC FLOW , POLYNOMIALS , PRESSURE , TEMPERATURE , THERMODYNAMIC PROPERTIES ,

    • NASA-LLIS-0509 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1994
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Description of Driving Event:
      Simulated acoustic emission signals were induced in a thin-walled graphite/epoxy tube by means of lead breaks (Hsu-Nielson Source). The tube is of similar material and ...
      Subject(s) : Research & Development ,

    • NASA-LLIS-1335 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;2003
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Abstract:
      The Mars Exploration Rover UHF Transceiver failed to attain carrier lock in duplex mode during flight qualification testing. The cause was finally traced to RF reflections into the UHF receiver ...
      Subject(s) : Communication Systems , communications , Facilities , Ground Equipment , Hardware , Industrial Operations , Payloads , Policy & Planning , Radio Frequency Subsystem , radio frequency test , RF leakage , Test & Verification , Test Article , Test Facility , test-induced failure ,

    • NACA-RM-L51J08 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1952
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: INTRODUCTION
      The design information necessary to evaluate optimum configurations for high-subsonic-speed long-range airplanes has been extended to include a 45° sweptback wing of aspect ratio 8 (references 1 and ...

    • NACA-TN-747 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1940
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Sound pressure of the first four harmonics of rotation from a full-scale two-blade propeller were measured and are compared with values calculated from theory. The comparison is made (1) for the space distribution with ...

    • NASA-LLIS-4579 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;2012
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: The Constellation Program (CxP) chose Windchill as the official data repository, which had a completely inadequate search function. CxP did not have one integrated library for all documents. Locating the most current ...

    • NASA-LLIS-0359 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1995
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Description of Driving Event:
      During the course of its test program at Dryden Flight Research Center, Edwards, CA, the X-31 experimental aircraft was retrofitted with an unheated Pitot-static probe (of ...
      Subject(s) : Aircraft , Environment , Flight Equipment ,

    • NASA-LLIS-0107 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1992
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Description of Driving Event:
      The 8 inch T-0 flexhose connects the tail service mast (TSM) with the LH2 carrier plate. Due to mechanical design the interface connection is very poor. The LO2 interface ...
      Subject(s) : Energetic Materials - Explosive/Propellant/Pyrotechnic , Fire Protection , Flight Equipment , Ground Equipment , Launch Vehicle ,

    • NASA-LLIS-1104 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1999
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Description of Driving Event:
      Use of Hardware Before Qualification Testing and the Use of Software Before Verification and Validation.
      Subject(s) : Aerospace Safety Advisory Panel , Computers , Risk Management/Assessment , Software , Test & Verification , Test Article , Test Facility ,

    • NASA-LLIS-2736 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;2010
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Abstract:
      The Space Shuttle Orbiter rejects heat from onboard electrical equipment, crew members, and other sources to an independent ground refrigerant loop through an onboard heat exchanger. ...
      Subject(s) : Launch support systems , Launch Systems , Orbiting Vehicles ,

    • NASA-LLIS-0727 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;2000
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Practice:
      Select and apply thermal coatings for control of spacecraft and scientific instrument temperatures within required ranges and for control of spacecraft charging and RF emissions.

    • NASA-TP-3557 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1996
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Prediction of the loss of wing leading-edge thrust and the accompanying increase in drag due to lift, when flow is not completely attached, presents a difficult but commonly encountered problem. A method (called the previous ...
      Subject(s) : AERODYNAMIC , AIRCRAFT , AIRFOIL , ANALYSIS , ANGLE , APPLICATIONS , ATTACK , BLUNT , BODY , COEFFICIENTS , COMPUTATIONAL , COMPUTERS , CONFIGURATIONS , DESIGN , DIMENSIONAL , DRAG , DYNAMICS , EDGE , EDGES , FLUID , FORCES , LEADING , LIFT , LOADING , MODELS , NUMBER , PERFORMANCE , PREDICTION , PROFILES , PROGRAMS , REYNOLDS , SHARP , TECHNIQUES , THRUST , TWO , WING ,

    • NACA-TR-560 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1937
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: A simplified treatment of the application of Heaviside's operational methods to problems of airplane dynamics is given. Certain graphical methods and logarithmic formulas that lessen the amount of computation involved are ...

    • NASA-LLIS-1825 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;2008
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Abstract:
      As part of the Exploration Systems Mission Directorates (HQ Code T) Lessons Learned Project, Johnson Space Center has compiled the results of ongoing Lessons Learned interviews and a Lessons ...

    • NACA-TR-1307 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1957
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: A method is presented for calculating the lift and centers of pressure of wing-body and wing-body-tail combinations at subsonic, transonic, and supersonic speeds. A set of design charts and a computing table are presented ...
      Subject(s) : AERODYNAMIC , AERODYNAMICS , AIRCRAFT , BODIES , BODY , CENTER , CIRCULAR , COMPONENTS , COMPUTATIONAL , CONFIGURATIONS , CYLINDERS , CYLINDRICAL , DYNAMICS , FLUID , INTERACTIONAL , INTERFERENCE , LIFT , MISSILE , PRESSURE , RECTANGULAR , SPEED , SUBSONIC , SUPERSONIC , SURFACES , TAIL , TRANSONIC , TRAPEZOIDAL , WING , WINGS ,

    • NASA-TN-D-970 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1961
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: An investigation has been made to determine the effect of ground proximity on the aerodynamic characteristics of aspect-ratio-1 airfoils. The investigation was made with the model moving over the water in a towing tank in ...
      Subject(s) : AERODYNAMIC , AERODYNAMICS , AIRFOILS , ANGLE , ASPECT , ATTACK , BOUNDARY , CHARACTERISTICS , DRAG , EFFECT , END , GROUND , INDUCED , LAYERS , LIFT , LONGITUDINAL , PLATES , RATIO , REDUCTION , STABILITY , STATIC , TESTS , TUNNEL , WALLS , WIND ,

    • NACA-TN-2960 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1953
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Pressure distributions around circular cylinders placed perpendicular to the stream for subsonic and supersonic flow conditions have been obtained. Drag coefficients calculated from these wind-tunnel tests and from transonic ...

    • NASA-CR-114649 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1973
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Calculation procedures are presented for predicting the noise-time histories and noise contours (footprints) of five basic types of aircraft; turbojet, turofan, turboprop, V/STOL, and helicopter. The procedures have been ...
      Subject(s) : ACOUSTIC MEASUREMENT , ACOUSTIC PROPERTIES , AIRCRAFT NOISE , ENGINE NOISE , HELICOPTERS , NOISE INTENSITY , TURBINE ENGINES , V/STOL AIRCRAFT ,

    • NASA-LLIS-0468 

      Type: standard
      Source: NASA - National Aeronautics and Space Administration (NASA):;1993
      Organization : NASA - National Aeronautics and Space Administration (NASA)
      Abstract: Description of Driving Event:
      During ground operations at KSC, the first United States Microgravity Laboratory (USML-1) did not allow contingency time for the development and installation/test of new ...
      Subject(s) : Administration/Organization , Ground Operations , Hardware , Policy & Planning ,