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  • 1
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    System Simulation by Recursive Feedback: Coupling a Set of Stand-Alone Subsystem Simulations (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Recursive feedback is defined and discussed as a framework for development of specific algorithms and procedures that propagate the time-domain solution for a dynamical system simulation consisting of multiple numerically coupled, self-contained, stand-alone subsystem simulations. A satellite motion example containing three subsystems (orbit dynamics, attitude dynamics, and aerodynamics) has been defined and constructed using this approach. Conventional solution methods are used in the subsystem simulations. Centralized and distributed versions of coupling structure have been addressed. Numerical results are evaluated by direct comparison with a standard total-system, simultaneous-solution approach.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: The Huntsville Simulation Conference 2002; Oct 09, 2002 - Oct 10, 2002; Huntsville, AL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    System Simulation by Recursive Feedback: Coupling A Set of Stand-Alone Subsystem Simulations (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Recursive feedback is defined and discussed as a framework for development of specific algorithms and procedures that propagate the time-domain solution for a dynamical system simulation consisting of multiple numerically coupled self-contained stand-alone subsystem simulations. A satellite motion example containing three subsystems (other dynamics, attitude dynamics, and aerodynamics) has been defined and constructed using this approach. Conventional solution methods are used in the subsystem simulations. Centralized and distributed versions of coupling structure have been addressed. Numerical results are evaluated by direct comparison with a standard total-system simultaneous-solution approach.
    Keywords: Cybernetics, Artificial Intelligence and Robotics
    Type: 34th Southeastern Symposium on System Theory; Mar 17, 2002 - Mar 19, 2002; Huntsville, AL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Numerical Evaluation of the "Dual-Kernel Counter-flow" Matric Convolution Integral that Arises in Discrete/Continuous (D/C) Control Theory (2009)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Discrete/Continuous (D/C) control theory is a new generalized theory of discrete-time control that expands the concept of conventional (exact) discrete-time control to create a framework for design and implementation of discretetime control systems that include a continuous-time command function generator so that actuator commands need not be constant between control decisions, but can be more generally defined and implemented as functions that vary with time across sample period. Because the plant/control system construct contains two linear subsystems arranged in tandem, a novel dual-kernel counter-flow convolution integral appears in the formulation. As part of the D/C system design and implementation process, numerical evaluation of that integral over the sample period is required. Three fundamentally different evaluation methods and associated algorithms are derived for the constant-coefficient case. Numerical results are matched against three available examples that have closed-form solutions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: M09-0153 , Southeastern Symposium on Systems Theory 2009; Mar 15, 2009 - Mar 17, 2009; Tullahoma, TN; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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