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  • 1
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    Analysis of pilot-aircraft performance and reliability via the application of man-machine models (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The present approach to analytic modeling, which utilizes human response theory together with modern control theory, is discussed. Analytic modeling of human performance has progressed to the point where it can be used with some confidence in the design and performance analysis of man-machine systems. An example of its use in helping design a flight director for the hover control of a VTOL vehicle is described. How the method could be used for analysis of human response to system failure is sketched.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Res. Center Systems Reliability Issues for Future Aircraft; p 141-156
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  • 2
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    An experimental paradigm for team decision processes (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The study of distributed information processing and decision making is presently hampered by two factors: (1) The inherent complexity of the mathematical formulation of decentralized problems has prevented the development of models that could be used to predict performance in a distributed environment; and (2) The lack of comprehensive scientific empirical data on human team decision making has hindered the development of significant descriptive models. As a part of a comprehensive effort to find a new framework for multihuman decision making problems, a novel experimental research paradigm was developed involving human terms in decision making tasks. Attempts to construct parts of an integrated model with ideas from queueing networks, team theory, distributed estimation and decentralized resource management are described.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Research Center, 21st Annual Conference on Manual Control; 2en1] p
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  • 3
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    Issues in Developing a Normative Descriptive Model for Dyadic Decision Making (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-27
    Description: 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.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Research Center 20th Ann. Conf. on Manual Control, Vol. 2; p 125
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  • 4
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    A comparison of motor submodels in the optimal control model (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Properties of several structural variations in the neuromotor interface portion of the optimal control model (OCM) are investigated. For example, it is known that commanding control-rate introduces an open-loop pole at S=O and will generate low frequency phase and magnitude characteristics similar to experimental data. However, this gives rise to unusually high sensitivities with respect to motor and sensor noise-ratios, thereby reducing the models' predictive capabilities. Relationships for different motor submodels are discussed to show sources of these sensitivities. The models investigated include both pseudo motor-noise and actual (system driving) motor-noise characterizations. The effects of explicit proprioceptive feedback in the OCM is also examined. To show graphically the effects of each submodel on system outputs, sensitivity studies are included, and compared to data obtained from other tests.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Res. Center The 14th Ann. Conf. on Manual Control; p 101-112
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  • 5
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    Modeling the effects of high-G stress on pilots in a tracking task (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Air-to-air tracking experiments were conducted at the Aerospace Medical Research Laboratories using both fixed and moving base dynamic environment simulators. The obtained data, which includes longitudinal error of a simulated air-to-air tracking task as well as other auxiliary variables, was analyzed using an ensemble averaging method. In conjunction with these experiments, the optimal control model is applied to model a human operator under high-G stress.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Res. Center The 14th Ann. Conf. on Manual Control; p 55-62
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  • 6
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    Analytical comparison of transient and steady state visual evoked cortical potentials (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: To better describe the linear-dynamic properties of the human visual-cortical response system, transient and steady state Visual Evoked Response Potentials (VERP) were observed. The stimulus presentation device provided both the evoking stimulus (flickering or pulsing lights) and a video task display. The steady state stimulus was modulated by a complex, ten frequency, sum-of-sines, wave. The transient VERP was the time-locked average of the EEG to a series of narrow light pulses (pulse width of 10 msec). The Fourier transform of the averaged pulses had properties that approximate band limited white noise, i.e., a flat spectrum over the frequency region spanned by the 10 summed sines. The Fourier transform of both the steady state and the transient evoked potentials resulted in transfer that are equivalent and therefore comparable. To investigate the effects of task loading on evoked potentials, a grammatical reasoning task was provided. Results support the relevancy of continued application of a systems engineering approach for describing neurosensory functioning.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA. Ames Research Center, 21st Annual Conference on Manual Control; 14 p
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  • 7
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    The discrete minimum principle with application to the linear regulator problem (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Discrete minimum principle to derive feedback control law for linear discrete-time systems
    Keywords: ELECTRONICS
    Type: NASA-CR-74852 , ESL-R-260
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  • 8
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    On-line methods for rotorcraft aeroelastic mode identification (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The requirements for the on-line identification of rotorcraft aeroelastic blade modes from random response test data are presented. A recursive maximum likelihood (RML) technique is used in conjunction with a bandpass filter to identify isolated blade mode damping and frequency. The RML technique is demonstrated to have excellent convergence characteristics in random measurement noise and random process noise excitation. The RML identification technique uses an ARMA representation for the aeroelastic stochastic system and requires virtually no user interaction while providing accurate confidence bands on the parameter estimates. Comparisons are made with an off-line Newton type maximum likelihood algorithm which uses a state variable model representation. Results are presented from simulation random response data which quantify the identifed parameter convergence behavior for various levels of random excitation which is typical of wind tunnel turbulence levels. The RML technique is applied to hingless rotor test data from the NASA Langley Research Center Helicopter Hover Facility.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
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  • 9
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    Some new control theoretic models for human operator display monitoring (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Control theoretic techniques are applied to develop two new models for predicting human operator performance when monitoring an automatically controlled system. In one case it is assumed that the human monitors the instruments in order to rapidly detect failures. A second approach assumes that the instruments are sampled to best reconstruct the system status information. The relation of these models to existing prediction schemes, e.g., equal attention and the Senders model is explored. It is concluded that a combination of failure detection and status estimation models offers the best potential for human operator application.
    Keywords: BEHAVIORAL SCIENCES
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  • 10
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    Numerical solution of the state dependent noise problem (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A numerical technique is given for solving the matrix quadratic equation that arises in the optimal stationary control of linear systems with state (and/or control) dependent noise. The technique exploits fully existing, efficient algorithms for the matrix Lyapunov and Ricatti equations. The computational requirements are discussed, with an associated example.
    Keywords: CYBERNETICS
    Type: IEEE Transactions on Automatic Control; AC-21; June 197
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