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  • 1
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    Dynamics of flexible bodies in tree topology - A computer-oriented approach (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 8; 584-590
    Format: text
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  • 2
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    Constraint elimination in dynamical systems (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Large space structures (LSSs) and other dynamical systems of current interest are often extremely complex assemblies of rigid and flexible bodies subjected to kinematical constraints. A formulation is presented for the governing equations of constrained multibody systems via the application of singular value decomposition (SVD). The resulting equations of motion are shown to be of minimum dimension.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Langley Research Center, Computational Methods for Structural Mechanics and Dynamics; p 537-541
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  • 3
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    Notes on implementation of Coulomb friction in coupled dynamical simulations (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A coupled dynamical system is defined as an assembly of rigid/flexible bodies that may be coupled by kinematic connections. The interfaces between bodies are modeled using hinges having 0 to 6 degrees of freedom. The equations of motion are presented for a mechanical system of n flexible bodies in a topological tree configuration. The Lagrange form of the D'Alembert principle was employed to derive the equations. The equations of motion are augmented by the kinematic constraint equations. This augmentation is accomplished via the method of singular value decomposition.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Marshall Space Flight Center Structural Dynamics and Control Interaction of Flexible Structures; p 1197-1213
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  • 4
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    Manipulator interactive design with interconnected flexible elements (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: This paper describes the development of an analysis tool for the interactive design of control systems for manipulators and similar electro-mechanical systems amenable to representation as structures in a topological chain. The chain consists of a series of elastic bodies subject to small deformations and arbitrary displacements. The bodies are connected by hinges which permit kinematic constraints, control, or relative motion with six degrees of freedom. The equations of motion for the chain configuration are derived via Kane's method, extended for application to interconnected flexible bodies with time-varying boundary conditions. A corresponding set of modal coordinates has been selected. The motion equations are imbedded within a simulation that transforms the vector-dyadic equations into scalar form for numerical integration. The simulation also includes a linear, time-invariant controler specified in transfer function format and a set of sensors and actuators that interface between the structure and controller. The simulation is driven by an interactive set-up program resulting in an easy-to-use analysis tool.
    Keywords: CYBERNETICS
    Format: text
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  • 5
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    Aircraft cockpit vision: Math model (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A mathematical model was developed to describe the field of vision of a pilot seated in an aircraft. Given the position and orientation of the aircraft, along with the geometrical configuration of its windows, and the location of an object, the model determines whether the object would be within the pilot's external vision envelope provided by the aircraft's windows. The computer program using this model was implemented and is described.
    Keywords: BEHAVIORAL SCIENCES
    Type: NASA-CR-141406
    Format: application/pdf
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  • 6
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    Precision Positional Data of General Aviation Air Traffic in Terminal Air Space (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Three dimensional radar tracks of general aviation air traffic at three uncontrolled airports are considered. Contained are data which describe the position-time histories, other derived parameters, and reference data for the approximately 1200 tracks. All information was correlated such that the date, time, flight number, and runway number match the pattern type, aircraft type, wind, visibility, and cloud conditions.
    Keywords: AERONAUTICS (GENERAL)
    Type: NASA-RP-1020
    Format: application/pdf
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  • 7
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    SENS-5D trajectory and wind-sensitivity calculations for unguided rockets (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A computational procedure is described which numerically integrates the equations of motion of an unguided rocket. Three translational and two angular (roll discarded) degrees of freedom are integrated through the final burnout; and then, through impact, only three translational motions are considered. Input to the routine is: initial time, altitude and velocity, vehicle characteristics, and other defined options. Input format has a wide range of flexibility for special calculations. Output is geared mainly to the wind-weighting procedure, and includes summary of trajectory at burnout, apogee and impact, summary of spent-stage trajectories, detailed position and vehicle data, unit-wind effects for head, tail and cross winds, coriolis deflections, range derivative, and the sensitivity curves (the so called F(Z) and DF(Z) curves). The numerical integration procedure is a fourth-order, modified Adams-Bashforth Predictor-Corrector method. This method is supplemented by a fourth-order Runge-Kutta method to start the integration at t=0 and whenever error criteria demand a change in step size.
    Keywords: AERODYNAMICS
    Type: NASA-CR-141402
    Format: application/pdf
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  • 8
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    Dynamics of flexible bodies in tree topology - A computer oriented approach (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An approach suited for automatic generation of the equations of motion for large mechanical systems (i.e., large space structures, mechanisms, robots, etc.) is presented. The system topology is restricted to a tree configuration. The tree is defined as an arbitrary set of rigid and flexible bodies connected by hinges characterizing relative translations and rotations of two adjoining bodies. The equations of motion are derived via Kane's method. The resulting equation set is of minimum dimension. Dynamical equations are imbedded in a computer program called TREETOPS. Extensive control simulation capability is built in the TREETOPS program. The simulation is driven by an interactive set-up program resulting in an easy to use analysis tool.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 84-1024
    Format: text
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  • 9
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    Inertial Upper Stage (IUS) software analysis (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Inertial Upper Stage (IUS) System, an extension of the Space Transportation System (STS) operating regime to include higher orbits, orbital plane changes, geosynchronous orbits, and interplanetary trajectories is presented. The IUS software design, the IUS software interfaces with other systems, and the cost effectiveness in software verification are described. Tasks of the IUS discussed include: (1) design analysis; (2) validation requirements analysis; (3) interface analysis; and (4) requirements analysis.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-161251 , REPT-79-020
    Format: application/pdf
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  • 10
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    Fog and Cloud Induced Aerosol Modification Observed by AERONET (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Large fine mode (sub-micron radius) dominated aerosols in size distributions retrieved from AERONET have been observed after fog or low-altitude cloud dissipation events. These column-integrated size distributions have been obtained at several sites in many regions of the world, typically after evaporation of low altitude cloud such as stratocumulus or fog. Retrievals with cloud processed aerosol are sometimes bimodal in the accumulation mode with the larger size mode often approx.0.4 - 0.5 microns radius (volume distribution); the smaller mode typically approx.0.12 to aprrox.0.20 microns may be interstitial aerosol that were not modified by incorporation in droplets and/or aerosol that are less hygroscopic in nature. Bimodal accumulation mode size distributions have often been observed from in situ measurements of aerosols that have interacted with clouds, and AERONET size distribution retrievals made after dissipation of cloud or fog are in good agreement with particle sizes measured by in situ techniques for cloud-processed aerosols. Aerosols of this type and large size range (in lower concentrations) may also be formed by cloud processing in partly cloudy conditions and may contribute to the shoulder of larger size particles in the accumulation mode retrievals, especially in regions where sulfate and other soluble aerosol are a significant component of the total aerosol composition. Observed trends of increasing aerosol optical depth (AOD) as fine mode radius increased suggests higher AOD in the near cloud environment and therefore greater aerosol direct radiative forcing than typically obtained from remote sensing, due to bias towards sampling at low cloud fraction.
    Keywords: Meteorology and Climatology
    Type: GSFC.JA.5476.2011
    Format: application/pdf
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