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  • 1
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    A disturbance based control/structure design algorithm (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Some authors take a classical approach to the simultaneous structure/control optimization by attempting to simultaneously minimize the weighted sum of the total mass and a quadratic form, subject to all of the structural and control constraints. Here, the optimization will be based on the dynamic response of a structure to an external unknown stochastic disturbance environment. Such a response to excitation approach is common to both the structural and control design phases, and hence represents a more natural control/structure optimization strategy than relying on artificial and vague control penalties. The design objective is to find the structure and controller of minimum mass such that all the prescribed constraints are satisfied. Two alternative solution algorithms are presented which have been applied to this problem. Each algorithm handles the optimization strategy and the imposition of the nonlinear constraints in a different manner. Two controller methodologies, and their effect on the solution algorithm, will be considered. These are full state feedback and direct output feedback, although the problem formulation is not restricted solely to these forms of controller. In fact, although full state feedback is a popular choice among researchers in this field (for reasons that will become apparent), its practical application is severely limited. The controller/structure interaction is inserted by the imposition of appropriate closed-loop constraints, such as closed-loop output response and control effort constraints. Numerical results will be obtained for a representative flexible structure model to illustrate the effectiveness of the solution algorithms.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: JPL, Proceedings of the 3rd Annual Conference on Aerospace Computational Control, Volume 1; p 122-139
    Format: application/pdf
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  • 2
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    Active versus passive damping in large flexible structures (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Optimal passive and active damping control can be considered in the context of a general control/structure optimization problem. Using a mean square output response approach, it is shown that the weight sensitivity of the active and passive controllers can be used to determine an optimal mix of active and passive elements in a flexible structure.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Research Center, Fourth NASA Workshop on Computational Control of Flexible Aerospace Systems, Part 2; p 655-661
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Slew disturbance compensation for multiple payloads of a flexible spacecrafts (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper extends an earlier developed mirror motion compensation (MMC) scheme (Chu, 1989, 1990) which calculates, on-board and in real time, the spacecraft motion induced by a slewing payload, to cases where one of the four conditions of the MMC scheme is not met. The analysis, the design methodology, and a case study related to the application of MMC to compensation for flexibility effects are presented. A sensitivity study is carried out to determine the compensation efficiency when uncertainties exist in parameters of the dynamic interaction model.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 92-4457 , AIAA Guidance, Navigation and Control Conference; Aug 10, 1992 - Aug 12, 1992; Hilton Head Island, SC; United States
    Format: text
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