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  • Other Sources  (132)
  • AIRCRAFT  (63)
  • STRUCTURAL MECHANICS  (36)
  • MACHINE ELEMENTS AND PROCESSES  (33)
  • 1970-1974  (132)
  • 1965-1969
  • 1950-1954
  • 1935-1939
  • 1974  (132)
Collection
  • Other Sources  (132)
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Years
  • 1970-1974  (132)
  • 1965-1969
  • 1950-1954
  • 1935-1939
Year
  • 1
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    Contributions to the study of the characteristics of bearing noise and vibrations (1974)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Results of experimental research on the noise and vibrations of radial ball and roller bearings are reported. Analysis of the frequency spectra disclosed dependences among vibration and noise, load, rpm and cage material. Some peculiar aspects of the frequency spectrum are also mentioned.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: The 4th Natl. Conf. on Acoustics, Vol. 1A (NASA-TT-F-15375); p 131-135
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Flight test of an automatic approach and landing concept for a simulated space shuttle represented by the NASA Convair 990 aircraft (1974)
    In:  CASI
    Details
    Publication Date: 2012-05-22
    Description: Unpowered automatic approaches and landings were conducted to study navigation, guidance, and control problems associated with terminal area, approach, and landing operation for the space shuttle. A Convair 990 aircraft was equipped with a digital flight-control computer connected to the aircraft control systems and displays. The flight tests evaluated, from 11,300 m to touchdown, the performance of a navigation and guidance concept that utilized blended radio/inertial navigation with VOR, DME, and ILS as the ground radio navigation aids. The results from 36 automatic approaches and landings are analyzed. Preliminary results indicate that this concept may provide sufficient accuracy that automatic landing of the unpowered shuttle orbiter can be accomplished on a conventional size runway.
    Keywords: AIRCRAFT
    Type: AGARD Advan. in Control Systems; 9 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Acoustical levitation for space processing (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It is pointed out that many space-manufacturing processes will require the manipulation of weightless molten material within a container in such a way that the material does not touch the container wall. A description is given of an acoustical method which can be used for the positioning and shaping of any molten material including nonconductors such as glasses. The new approach makes use of an acoustical standing wave which is excited within an enclosure or resonator.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: Astronautics and Aeronautics; 12; July-Aug
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Acoustical positioning chamber for space processing (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: By readily levitating, positioning, and manipulating materials placed in it, the acoustical resonator can serve a variety of space processing operations, such as drawing crystals, degassing, and stirring of melts, and casting.
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA. Marshall Space Flight Center Proc. of the 3d Space Processing Symp. on Skylab Results, Vol. 2; p 679-690
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A study of subsonic transport aircraft configurations using hydrogen (H2) and methane (CH4) as fuel (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The acceptability of alternate fuels for future commercial transport aircraft are discussed. Using both liquid hydrogen and methane, several aircraft configurations are developed and energy consumption, aircraft weights, range and payload are determined and compared to a conventional Boeing 747-100 aircraft. The results show that liquid hydrogen can be used to reduce aircraft energy consumption and that methane offers no advantage over JP or hydrogen fuel.
    Keywords: AIRCRAFT
    Type: NASA-TM-X-71994
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Application of boundary integral method to elastoplastic analysis of V-notched beams (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The boundary integral equation method was applied in the solution of the plane elastoplastic problem. The use of this method was illustrated by obtaining stress and strain distributions for a number of specimens with a single-edge notch and subjected to pure bending. The boundary integral equation method reduced the inhomogeneous biharmonic equation to two coupled Fredholm-type integral equations. These integral equations were replaced by a system of simultaneous algebraic equations and solved numerically in conjunction with a method of successive elastic solutions.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TN-D-7637 , E-7658
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Effectiveness evaluation of STOL transport operations (phase 2) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computer simulation program which models a commercial short-haul aircraft operating in the civil air system was developed. The purpose of the program is to evaluate the effect of a given aircraft avionics capability on the ability of the aircraft to perform on-time carrier operations. The program outputs consist primarily of those quantities which can be used to determine direct operating costs. These include: (1) schedule reliability or delays, (2) repairs/replacements, (3) fuel consumption, and (4) cancellations. More comprehensive models of the terminal area environment were added and a simulation of an existing airline operation was conducted to obtain a form of model verification. The capability of the program to provide comparative results (sensitivity analysis) was then demonstrated by modifying the aircraft avionics capability for additional computer simulations.
    Keywords: AIRCRAFT
    Type: NASA-CR-137481
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Theory to test comparisons for selected aerospace multishell structures and their interfaces under thermomechanical loadings (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Guidelines for structural shell analyses were obtained on the basis of theory-to-test comparisons made on two large-scale aerospace structures subject to thermomechanical loads. The first structural test was the cylindrical aluminum skin-stringer-ring construction of the S-IC forward skirt and S-II interstage. The second structural test included the truncated, cone-shaped, bonded honeycomb sandwich shell of the Spacecraft Lunar Module Adapter; the cylindrical bonded aluminum honeycomb sandwich construction of the Instrument Unit; and the skin-stringer construction with rings and intercostals of the S-IVB forward skirt. Analyses were made for loadings simulating the flight environment. Elementary shear lag theory was superimposed on shell analysis for interface junctions between stages to obtain favorable theory-to-test stress comparisons.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 74-1270 , Canadian Aeronautics and Space Institute and American Institute of Aeronautics and Astronautics, Joint Meeting, Toronto; Oct 30, 1974 - Oct 31, 1974; Toronto; Canada
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A wind-tunnel investigation of a B-52 model flutter suppression system (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Flutter modeling techniques have been successfully extended to the difficult case of the active suppression of flutter. The demonstration was conducted in a transonic dynamics tunnel using a 1/30 scale, elastic, dynamic model of a Boeing B-52 control configured vehicle. The results from the study show that with the flutter suppression system operating there is a substantial increase in the damping associated with the critical flutter mode. The results also show good correlation between the damping characteristics of the model and the aircraft.
    Keywords: AIRCRAFT
    Type: AIAA PAPER 74-401 , Structures, Structural Dynamics and Materials Conference; Apr 17, 1974 - Apr 19, 1974; Las Vegas, NV; US
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    NASA TECHNICAL REPORTS
  • 10
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    A detailed investigation of flight buffeting response at subsonic and transonic speeds (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The structural response to aerodynamic buffeting during moderate-to-high-g maneuvers was investigated. Dynamic response data measured during a flight loads program were analyzed to obtain power spectra and rms values of response for 19 sensors mounted on the test aircraft. In this paper, peaks in the power spectra of accelerations measured at the wing tips, center of gravity and pilot's seat, and wing vertical shear, bending moment and torsional moments are correlated with natural vibration modes. The amplitudes of response are compared to show effects of angle of attack, sensor type and location, Mach number, and altitude.
    Keywords: AIRCRAFT
    Type: AIAA PAPER 74-358 , Structures, Structural Dynamics and Materials Conference; Apr 17, 1974 - Apr 19, 1974; Las Vegas, NV; US
    Format: text
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    NASA TECHNICAL REPORTS
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