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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 38 (1969), S. 53-57 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Bei der Untersuchung von Drehbewegungen starrer Körper erweist es sich oft als notwendig, nichtlineare Glieder zu berücksichtigen, da durch Linearisierung wesentliche Eigenschaften verloren gehen können. Vielfach können die nichtlinearen Effekte bereits durch Berücksichtigung der quadratischen Glieder erfaßt werden. Die Aufstellung der quadratischen Näherungen ist im einzelnen schwierig, so daß leicht Rechenfehler gemacht werden können. Deshalb wird in der vorliegenden Arbeit ein zweckmäßiges Verfahren zur Aufstellung der quadratischen Näherungen als Matrizen-Gleichungen angegeben. Für den allgemeinen Fall werden explizite Formeln für die Matrizen der Richtungscosinus und der Winkelgeschwindigkeiten angegeben. Diese Formeln werden auf das Beispiel eines schwerestabilisierten Satelliten angewendet, bei dem nichtlineare Resonanzen festgestellt wurden. Durch quadratische Näherungen lassen sich diese rechnerisch erfassen.
    Notes: Summary For many problems of interest in rotational dynamics, linearized equations obscure essential features of system response, and non-linear formulations are required. Meaningful progress in dynamic analysis may nonetheless require some level of approximation, and frequently the retention of second degree terms in the variational coordinates and their derivatives is sufficient to reveal the inherently nonlinear characteristics of the response. The formulation of equations in this quadratic approximation is typically fraught with difficulties of detail, with consequent likelihood of computational error. The present note offers a rationale for performing the desired quadratic approximation at the matrix level, and indeed explicit formulas are developed which provide in general terms the required expressions for the direction cosine matrix and the angular velocity matrix. These formulas are illustrated in application to the gravity-gradient satellite, which is known to exhibit nonlinear resonances which can be detected in the quadratic approximation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 37 (1969), S. 388-392 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Für Stabilitäts- und Regelungsuntersuchungen werden die Bewegungsgleichungen eines drehenden Körpers, die in einem sich beliebig drehenden Koordinatensystem dargestellt sind, häufig in linearisierter Form benötigt. Es wird nun eine Methode angegeben, wie man diese linearisierten Gleichungen in Matrixform erhalten kann. Gegenüber dem üblichen Vorgehen, die skalaren Gleichungen zu linearisieren, zeichnet sich die Methode durch wesentlich geringeren Arbeitsaufwand und größere Genauigkeit aus. Als Anwendungsbeispiele werden Librationen eines auf einer Kreisbahn umlaufenden Satelliten und die Bewegungen eines Kreisels mit zwei Freiheitsgraden auf einer drehenden Basis betrachtet.
    Notes: Summary The dynamical equations of a rotating body whose motion is referred to an arbitrarily rotating reference frame are often desired in linearized form in connection with stability and orientation control studies. The method of this paper shows how to obtain these linearized equations in matrix form, saving considerable labor and promoting accuracy relative to the linearization process done at the sealer level. Illustrative applications are made to a librating orbiting body and a one-axis gyroscope on a rotating base.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1969-01-01
    Print ISSN: 0020-1154
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 4
    Publication Date: 1969-01-01
    Print ISSN: 0020-1154
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 5
    Publication Date: 2006-01-12
    Description: Results are presented to illustrate the application of established procedures of linear, quadratic, Gaussian optimal estimation and control to a spacecraft with dynamically significant elastic appendages. Interpretations are provided in both time domain and frequency domain, and conclusions are drawn for a wide class of problems of flexible spacecraft attitude control.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: ESA Dyn. and Control of Non-rigid Space Vehicles; 5 p
    Format: text
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  • 6
    facet.materialart.
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    In:  Other Sources
    Publication Date: 2011-08-16
    Description: Flexible spacecraft attitude control and classification systems based on mathematical models
    Keywords: SPACE VEHICLES
    Type: ; TROPHYSICAL JOURNAL
    Format: text
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  • 7
    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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  • 8
    facet.materialart.
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    In:  Other Sources
    Publication Date: 2011-08-11
    Description: Rotating spacecraft attitude changes due to energy dissipation from angular deformation treated by modal method
    Keywords: SPACE VEHICLES
    Type: /AIAA/JACC GUIDANCE AND CONTROL CONFERENCE
    Format: text
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  • 9
    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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  • 10
    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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