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  • Weitere Quellen  (397)
  • FLUID MECHANICS AND HEAT TRANSFER  (259)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
  • 1980-1984  (397)
  • 1
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    Evaluation of ride quality prediction methods for operational military helicopters (1984)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The results of a simulator study conducted to compare and validate various ride quality prediction methods for use in assessing passenger/crew ride comfort within helicopters are presented. Included are results quantifying 35 helicopter pilots' discomfort responses to helicopter interior noise and vibration typical of routine flights, assessment of various ride quality metrics including the NASA ride comfort model, and examination of possible criteria approaches. Results of the study indicated that crew discomfort results from a complex interaction between vibration and interior noise. Overall measures such as weighted or unweighted root-mean-square acceleration level and A-weighted noise level were not good predictors of discomfort. Accurate prediction required a metric incorporating the interactive effects of both noise and vibration. The best metric for predicting crew comfort to the combined noise and vibration environment was the NASA discomfort index.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: American Helicopter Society, Journal (ISSN 0002-8711); 29; 11-18
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Mean flowfields in axisymmetric combustor geometries with swirl (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: (Previously cited in issue 06, p. 860, Accession no. A82-17824)
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Development of a nitrogen generation system (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An eight-stage nitrogen generation module was developed. The design integrated a hydrazine catalytic dissociator, three ammonia dissociation stages and four palladium/silver hydrogen separator stages. Alternating ammonia dissociation and hydrogen separation stages are used to remove hydrogen and ammonia formed in the dissociation of hydrazine which results in negligible ammonia and hydrogen concentrations in the product nitrogen stream. An engineering breadboard nitrogen supply subsystem was also developed. It was developed as an integratable subsystem for a central spacecraft air revitalization system. The subsystem consists of the hydrazine storage and feed mechanism, the nitrogen generation module, the peripheral mechanical and electrical components required to control and monitor subsystem performance, and the instrumentation required to interface with other subsystems of an air revitalization system. The breadboard nitrogen supply subsystem was integrated and tested with a one-person capacity experimental air revitalization system. The integration, checkout and testing was successfully accomplished.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: NASA-CR-152333 , LSI-TR-353-4
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Mean flowfields in axisymmetric combustor geometries with swirl (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Six flowfield configurations are investigated with sidewall angles of 90 and 45 deg, and swirl vane angles of 0, 45, and 70 deg. It is found that central recirculation zones occur for the swirling flow cases investigated, which extend from the inlet to x/D = 1.7, where x is the axial polar coordinate, and D is the test section diameter. Five-hole pitot probe pressure measurements are used to determine time-mean velocities, and corresponding flow situations are predicted and compared to results of experimental data. Excellent agreement is found for the nonswirling flow, although poor agreement is found for swirling flow cases, especially near the inlet. The discrepancy is attributed to the lack of realism in the turbulence model, and/or to inaccurate specification of time-mean velocity and turbulence energy distributions at the inlet.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: AIAA PAPER 82-0177 , Aerospace Sciences Meeting; Jan 11, 1982 - Jan 14, 1982; Orlando, FL
    Format: text
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  • 5
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    The effectiveness of using real-time eye scanning information for pilot training (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: A study to evaluate the idea of providing pilots feedback on their scan behavior as an instrumentional training aid was conducted jointly by NASA, Piedmont Aviation, and Old Dominion University. The study used Langley's oculometer system to provide a real-time display of the trainee's scan to the instructor pilot in the aft part of the Boeing 737 training simulator at Piedmont. The trainees' scan behavior was also video-taped for viewing by the instructor and trainee after each training session. Based on qualitative data obtained during the study, scan behavior feedback was an effective tool for pilot training.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Anthropometric data error detecting and correction with a computer (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Data obtained with automated anthropometric data aquisition equipment was examined for short term errors. The least squares curve fitting technique was used to ascertain which data values were erroneous and to replace them, if possible, with corrected values. Errors were due to random reflections of light, masking of the light rays, and other types of optical and electrical interference. It was found that the signals were impossible to eliminate from the initial data produced by the television cameras, and that this was primarily a software problem requiring a digital computer to refine the data off line. The specific data of interest was related to the arm reach envelope of a human being.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: The 1981 NASA ASEE Summer Fac. Fellowship Program, Vol. 1; 12 p
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Active Sticks: a New Dimension in Controller Design (1984)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A smart stick controller was built which actively produces a force to interact with the subject's hand and to aid in tracking. When the human tracks in this situation, the man-machine system can be viewed as the combination of two closed loop feedback paths. The inner loop occurs as a result of a tactile information channel effecting the man-controller interaction through force with this stick in the active mode (the stick generates a force) and the passive mode (the stick not generating a force) are reported. The most noteworthy observation is a significant increase in apparent neuromotor bandwidth and consequently better tracking performance.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: NASA. Ames Research Center 20th Ann. Conf. on Manual Control, Vol. 1; p 719-734
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
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    Time Series Modeling of Human Operator Dynamics in Manual Control Tasks (1984)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: A time-series technique is presented for identifying the dynamic characteristics of the human operator in manual control tasks from relatively short records of experimental data. Control of system excitation signals used in the identification is not required. The approach is a multi-channel identification technique for modeling multi-input/multi-output situations. The method presented includes statistical tests for validity, is designed for digital computation, and yields estimates for the frequency response of the human operator. A comprehensive relative power analysis may also be performed for validated models. This method is applied to several sets of experimental data; the results are discussed and shown to compare favorably with previous research findings. New results are also presented for a multi-input task that was previously modeled to demonstrate the strengths of the method.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: NASA. Ames Research Center 20th Ann. Conf. on Manual Control, Vol. 1; p 1-40
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Issues in Developing a Normative Descriptive Model for Dyadic Decision Making (1984)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-27
    Beschreibung: Most research in modelling human information processing and decision making has been devoted to the case of the single human operator. In the present effort, concepts from the fields of organizational behavior, engineering psychology, team theory and mathematical modelling are merged in an attempt to consider first the case of two cooperating decisionmakers (the Dyad) in a multi-task environment. Rooted in the well-known Dynamic Decision Model (DDM), the normative descriptive approach brings basic cognitive and psychophysical characteristics inherent to human behavior into a team theoretic analytic framework. An experimental paradigm, involving teams in dynamic decision making tasks, is designed to produce the data with which to build the theoretical model.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: NASA. Ames Research Center 20th Ann. Conf. on Manual Control, Vol. 2; p 125
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    The Design and Use of Subtasks in Part Training and Their Relationship to the Whole Task (1984)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-16
    Beschreibung: The part versus whole training is discussed. Common sense dictates that a massive body of knowledge should not be taught as a whole. For the same reason, if a part of the task is very difficult, one should not go over the task in its entirety. Repetitive training on the difficult part should lead to better results. Several part training methods were developed, including: pure part, progressive part, repetitive part, retrogressive and isolated parts. The question was posited whether training on parts of a task is a beneficial enterprise. The way the task will be disassembled for the part training needs to be determined. It is argued that the effectiveness of part training depends on the degree to which a task is decomposable.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: NASA. Ames Research Center 20th Ann. Conf. on Manual Control, Vol. 2; p 283-290
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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