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  • Other Sources  (3)
  • AIRCRAFT  (1)
  • BIOTECHNOLOGY  (1)
  • COMPUTERS  (1)
  • 1970-1974  (3)
  • 1
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    Evaluation of a stall-flutter spring-damper pushrod in the rotating control system of a CH-54B helicopter (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Results of a design and flight test program conducted to define the effect of rotating pushrod damping on stall-flutter induced control loads are presented. The CH-54B helicopter was chosen as the test aircraft because it exhibited stall induced control loads. Damping was introduced into the CH-54B control system by replacing the standard pushrod with spring-damper assemblies. Design features of the spring-damper are described and the results of a dynamic analysis are shown which define the pushrod stiffness and damping requirements. Flight test measurements taken at 47,000 lb gross weight with and without the damper are presented. The results indicate that the spring-damper pushrods reduced high frequency, stall-induced rotating control loads by almost 50%. Fixed system control loads were reduced by 40%. Handling qualities in stall were unchanged, as expected.
    Keywords: AIRCRAFT
    Type: NASA. Ames Res. Center Rotorcraft Dyn.; p 223-232
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The MSFC UNIVAC 1108 EXEC 8 simulation model (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A model is presented which simulates the MSFC Univac 1108 multiprocessor system. The hardware/operating system is described to enable a good statistical measurement of the system behavior. The performance of the 1108 is evaluated by performing twenty-four different experiments designed to locate system bottlenecks and also to test the sensitivity of system throughput with respect to perturbation of the various Exec 8 scheduling algorithms. The model is implemented in the general purpose system simulation language and the techniques described can be used to assist in the design, development, and evaluation of multiprocessor systems.
    Keywords: COMPUTERS
    Type: NASA-CR-61379
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Mishaps with Oxygen in NASA Operations (1971)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Data from a substantial number of oxygen mishaps obtained from NASA and contractor records are presented. Information from several Air Force records, concerning oxygen accidents involving aircraft operations, are also included. Descriptions of the mishaps and their causes, for both liquid and gaseous oxygen in ground test facilities and space vehicle systems, are given. A number of safety regulations aimed at reducing the accident probability is discussed. The problems related to material compatibility and materials testing are considered, and the limited information on factors affecting the ignition of materials in oxygen is presented. In addition, details are given of several of the accident/incidents listed in order to define the combination of conditions causing the mishap. In addition to propellant system mishaps, accident/incidents which occurred in space and ground system structures were included, as well as those in electrical systems, ground support facilities, ordnance, and related operations.
    Keywords: BIOTECHNOLOGY
    Type: NASA-TM-X-67953 , E-6604 , Oxygen Compressors and Pumps Symp.; Nov 09, 1971 - Nov 11, 1971; Atlanta
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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