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Mathematical modelling of flexible multibody dynamics with application to orbiting systemsIbrahim, Ahmed El-Hady M. January 1988 (has links)
A relatively general formulation for the governing equations of motion, applicable to a large class of flexible multibody systems, is developed using a concise matrix format. The model considered consists of a number of arbitrarily connected flexible deployable members forming branched and closed loop configurations. Joints between bodies are permitted up to six degrees of freedom in translation and rotation. To be effective, the matrix-Lagrangian formulation necessitates development of the kinetic energy expression in a quadratic form in terms of the system velocities. The mass matrix associated with such a quadratic form is known for simple systems such as a collection of point masses, a group of connected rigid bodies, and a discretized flexible structure. However, for a multibody system, where the contributing forces arise from system's translation, rotation, elasticity, deployment, and their interactions, such an expression is not available. To fill this gap, multibody kinematics is developed in terms of the elements of the geometry matrix,
which uniquely describes the configuration of branched systems. The characteristic dynamical quantities, i.e., elements of the mass matrix, are identified and the formulation is approached in an increasing order of complexity. The concept of specified and generalized coordinates together with established procedures of analytical dynamics lead to characteristic
quantities ( Lagrangian, Hamiltonian, etc. ) and finally result in governing equations of motion which are new to the multibody dynamics. To account for flexibility in a consistent
manner, a second-degree nonlinear displacement field is permitted. Alternatively, a linear displacement field can be used if the nonlinear terms up to the fourth-degree are preserved in the strain energy. An algorithm for calculating the stiffness matrix of a flexible element is developed, where terms up to the third-degree of nonlinearity in displacement are retained.
Application of this versatile formulation is illustrated through a set of examples of contemporary interest. They pertain to a spacecraft comprising of a central rigid body with attached flexible appendages. The configuration corresponds to a large class of present and planned communication satellites. It can also represent the Space Shuttle based deployment
of beam and plate type appendages aimed at scientific experiments or construction of the proposed Space Station. The system static equilibrium and stability are discussed. A computer code is developed and specialized to the specific cases in hand. Typical results of an extensive parametric study are presented for two particular situations :
(i) the Space Shuttle based deployment of a beam or a plate type structural member;
(ii) the configuration similar to the Waves In Space Plasma (WISP) experiment jointly proposed by Canada and the U.S.A.
The problems are analyzed systematically, through progressive introduction of complexity,
to help appreciate interactions between librational dynamics, flexibility, deployment, inertia parameters, orbit eccentricity, initial conditions, appendage orientation, etc. The information is fundamental to the missions concerned and essential to help develop appropriate
control strategies. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate
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The rotation of the moonCappallo, Roger James January 1980 (has links)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1980. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND LINDGREN. / Bibliography: leaves 66-68. / by Roger James Cappallo. / Ph.D.
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ANALYSIS OF A FINITE VOLUME NUMERICAL SCHEME AS APPLIED TO THE RINGLEB PROBLEM.Gross, Karl J. January 1984 (has links)
No description available.
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Direct linearization of continuous and hybrid dynamical systemsParish, Julie Marie Jones 15 May 2009 (has links)
Linearized equations of motion are important in engineering applications, especially
with respect to stability analysis and control design. Traditionally, the full, nonlinear
equations are formed and then linearized about the desired equilibrium configuration
using methods such as Taylor series expansions.
However, it has been shown that the quadratic form of the Lagrangian function can be used to directly linearize the equations of motion for discrete dynamical
systems. Here, this development is extended to directly generate linearized equations of motion for both continuous and hybrid dynamical systems, where a hybrid
system is described with both discrete and continuous generalized coordinates. The
results presented require only velocity level kinematics to form the Lagrangian and
find equilibrium configuration(s) for the system. A set of partial derivatives of the
Lagrangian are then computed and used to directly construct the linearized equations of motion about the equilibrium configuration of interest. This study shows
that the entire nonlinear equations of motion do not have to be generated in order
to construct the linearized equations of motion. Several examples are presented to
illustrate application of these results to both continuous and hybrid system problems.
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The spinning topMiles, Aaron Jefferson. January 1931 (has links) (PDF)
Thesis (M.S.)--University of Missouri, School of Mines and Metallurgy, 1931. / The entire thesis text is included in file. Typescript and handwritten by author. Illustrated by author. Title from title screen of thesis/dissertation PDF file (viewed December 3, 2009) Includes bibliographical references (p. 25) and index (p. 26).
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Reconfiguration and maintenance of satellite formations in the presence of J₂ perturbations /Horneman, Kenneth. January 2003 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2003. / Typescript. Includes bibliographical references (leaves 64-66). Also available on the Internet.
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Reconfiguration and maintenance of satellite formations in the presence of J₂ perturbationsHorneman, Kenneth. January 2003 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2003. / Typescript. Includes bibliographical references (leaves 64-66). Also available on the Internet.
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A solution of Euler's geometric equations for the motion of a rigid body with a fixed point under no forcesRenehan, Dolphus January 1927 (has links)
No description available.
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Theoretical study of self-induced flow in a rotating tubeGilham, S. January 1990 (has links)
No description available.
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The equations of motion of a deformable saturated porous medium with micropolar structure /Dixon, Leonard. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2001. / Typescript (photocopy). Includes bibliographical references. Also available on the World Wide Web.
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