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  • Other Sources  (28)
  • FLUID MECHANICS AND HEAT TRANSFER  (19)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (9)
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  • 1
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    Mental workload in supervisory control of automated aircraft (1983)
    In:  CASI
    Details
    Publication Date: 2004-10-30
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: 19th Annual Conference on Manual Control; p 40-57
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  • 2
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    Human decision model in failure compensation (1983)
    In:  CASI
    Details
    Publication Date: 2004-10-30
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: 19th Annual Conference on Manual Control; p 338-351
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  • 3
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    Variable force and visual feedback effects on teleoperator man/machine performance (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An experimental study was conducted to determine the effects of various forms of visual and force feedback on human performance for several telemanipulation tasks. Experiments were conducted with varying frame rates and subtended visual angles, with and without force feedback.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: JPL, California Inst. of Tech., Proceedings of the NASA Conference on Space Telerobotics, Volume 1; p 89-98
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  • 4
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    Adjustable impedance, force feedback and command language aids for telerobotics (parts 1-4 of an 8-part MIT progress report) (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Projects recently completed or in progress at MIT Man-Machine Systems Laboratory are summarized. (1) A 2-part impedance network model of a single degree of freedom remote manipulation system is presented in which a human operator at the master port interacts with a task object at the slave port in a remote location is presented. (2) The extension of the predictor concept to include force feedback and dynamic modeling of the manipulator and the environment is addressed. (3) A system was constructed to infer intent from the operator's commands and the teleoperation context, and generalize this information to interpret future commands. (4) A command language system is being designed that is robust, easy to learn, and has more natural man-machine communication. A general telerobot problem selected as an important command language context is finding a collision-free path for a robot.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: JPL, California Inst. of Tech., Proceedings of the NASA Conference on Space Telerobotics, Volume 1; p 81-88
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  • 5
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    Effect of turbulence models on criticality conditions in swirling flows (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The critical state of vortex cores downstream of vortex breakdown has been studied. Base vortical flows were computed using the Reynolds-averaged, axisymmetric Navier-Stokes equations. Standard K - epsilon, RNG and second-order Reynolds stress models were employed. Results indicate that the return to supercriticality is highly dependent on the turbulence model. The K - epsilon model predicted a rapid return of the vortex to supercritical conditions, the location of which showed little sensitivity to changes in the swirl ratio. The Reynolds stress model predicted that the vortex remains subcritical to the end of the domain for each of the swirl ratios employed, and provided results in qualitative agreement with experimental work. The RNG model produced intermediate results, with a downstream movement in the critical location with increasing swirl. Calculations for which area reductions were introduced at the exit in a subcritical flow were also performed using the Reynolds stress model. The structure of the resulting recirculation zone was altered significantly. However, when area reductions were employed within supercritical flows as predicted using the two-equation models, no significant influence on the recirculation zone was noted.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center, The Sixth Annual Thermal and Fluids Analysis Workshop; p 163-173
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  • 6
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    Human factors issues in telerobotic systems for Space Station Freedom servicing (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Requirements for Space Station Freedom servicing are described and the state-of-the-art for telerobotic system on-orbit servicing of spacecraft is defined. The projected requirements for the Space Station Flight Telerobotic Servicer (FTS) are identified. Finally, the human factors issues in telerobotic servicing are discussed. The human factors issues are basically three: the definition of the role of the human versus automation in system control; the identification of operator-device interface design requirements; and the requirements for development of an operator-machine interface simulation capability.
    Keywords: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Type: NASA, Lyndon B. Johnson Space Center, Third Annual Workshop on Space Operations Automation and Robotics (SOAR 1989); p 485-492
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  • 7
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    Numerical experiments on boundary-layer receptivity (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The incompressible laminar flow over an infinitely thin flat plate is obtained using a Navier-Stokes code in vorticity-velocity variables. The flow at and near the leading edge of the plate is an integral part of the solution algorithm which requires no special treatment; thus allowing for the flow field in this region to be studied in detail. An incident plane sound wave is imposed in the free-stream flow and the receptivity of the boundary layer is studied with particular emphasis to the flow near and at the leading edge.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 8
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    The present state and future direction of second order closure models for compressible flows (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The topics are presented in viewgraph form and include: (1) Reynolds stress closure models; (2) Favre averages and governing equations; (3) the model for the deviatoric part of the pressure-strain rate correlation; (4) the SSG pressure-strain correlation model; (5) a compressible turbulent dissipation rate model; (6) variable viscosity effects; (7) near-wall stiffness problems; (8) models of the Reynolds mass and heat flux; and (9) a numerical solution of the compressible turbulent transport equation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center, Workshop on Engineering Turbulence Modeling; p 249-275
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  • 9
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    Studies in turbulence (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Various papers on turbulence are presented. Individual topics addressed include: modeling the dissipation rate in rotating turbulent flows, mapping closures for turbulent mixing and reaction, understanding turbulence in vortex dynamics, models for the structure and dynamics of near-wall turbulence, complexity of turbulence near a wall, proper orthogonal decomposition, propagating structures in wall-bounded turbulence flows. Also discussed are: constitutive relation in compressible turbulence, compressible turbulence and shock waves, direct simulation of compressible turbulence in a shear flow, structural genesis in wall-bounded turbulence flows, vortex lattice structure of turbulent shear slows, etiology of shear layer vortices, trilinear coordinates in fluid mechanics.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ; 615 p.
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  • 10
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    Modeling the dissipation rate in rotating turbulent flows (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A variety of modifications to the modeled dissipation rate transport equation that have been proposed during the past two decades to account for rotational strains are examined. The models are subjected to two crucial test cases: the decay of isotropic turbulence in a rotating frame and homogeneous shear flow in a rotating frame. It is demonstrated that these modifications do not yield substantially improved predictions for these two test cases and in many instances give rise to unphysical behavior. An alternative proposal, based on the use of the tensor dissipation rate, is made for the development of improved models.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-187485 , ICASE-90-88 , NAS 1.26:187485 , AD-A232079
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