Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"Rigid-Body Motion"”.
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Facet model optic flow and rigid body motion
… iterative and a non-iterative one, determine 3D motion parameters and surface structure (relative depth) from the computed optic flow field. Finally we discuss a technique for the image segmentation based on the multi-object motion using both optic flow and its time derivative. The facet model …
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Real-time measurement of three-dimensional multiple rigid body motion
Thesis. 1977. M.S.--Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
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INTERPOLATION OF RIGID-BODY MOTION AND GALERKIN METHODS FOR FLEXIBLE MULTIBODY DYNAMICS
Traditionally, flexible multibody dynamics problems are formulated as initial value problems: initial states of the system are given and solving for the equations of motion yields the dynamic response. Many practical problems, however, are boundary rather than initial value problems; two-point and …
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A vector based approach for high frequency prospective correction of rigid body motion in Magnetic Resonance Imaging (MRI)
… The artefacts are dependent on how and when motion occurred, and manifest as ghosting, ringing and blurring of the image. This thesis describes a novel approach to measuring and correcting for motion as the data are acquired. A small device was constructed that combines observations from a …
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Noise transmission path identification in a reciprocating freon compressor
… vibration pattern appears to be a combination of rigid-body motion of the compressor shell in response to the orbiting spring forces and a circumferential acoustic mode inside the shell. The sound intensity pattern radiated by a regular version of the same compressor model closely resembles the …
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An estimation-theoretic technique for motion-compensated synthetic-aperture array imaging
… coherent processing to exploit the relative motion between an airborne or spaceborne radar antenna and the imaged target field (effectively synthesizing the effect of a larger aperture array). From an estimation-theoretic perspective, this thesis addresses the following limitations of …
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Modeling and Slew-Maneuver Control of a Flexible Spacecraft
… for a flexible spacecraft consisting of a rigid main body to which a long flexible appendage is attached. Nonlinear dynamical system models are developed using both distributed parameter modeling and discrete parameter modeling; these models are shown to be equivalent for appropriately …
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Interactive control of linked rigid body simulations
Numerical simulation of linked rigid-body motion generates realistic motion automatically. Simulation alone, however, prevents intuitive direction. In the worst case, an artist repeatedly tweaks a variety of simulation parameters until she achieves the desired effect. Because of the complexity of …
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Six degree of freedom optimal trajectories for satellite rendezvous
… equations to describe translational motions, Euler's equations of rigid body motion for describing the attitude motions, and a sequential quadratic programming optimization code. Initial solutions are found assuming no coupling between the translational and rotational motions and with …
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Uma formulação de elementos de contorno para análise de vibrações livres
… to approximate the accelerations within the body. With this procedure the free vibration problem is reduced to a generalized algebraic eigenvalue problem, whose solution is carried out in a direct and simultaneous way. This is only possible due to the elastostatic fundamental solution which …
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Deep Deck and Cellular Deck Diaphragm Strength and Stiffness Evaluation
… and making corrections to remove any rigid body motion. The second method is by measuring the deflection of the diagonals of the diaphragm. In this study both measurements were taken to do a comparison of the results that were obtained. Both strength and stiffness values were …
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Steady state vibration analysis of cam driven elastic slider crank linkage with displacement parameter variation
… Based on a cam designed for assumed rigid body motion (kinematic synthesis), the actual output motion of the elastic linkage is determined. The results are presented for different parameter combinations to allow an early selection process of a suitable parameter set.
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Modeling the properties of silicates
… obtained for TO₄ tetrahedra (T = Si, Al) suggest rigid TO bonds are more common in non-framework than in framework silicates. Correlated motion is found among the ADPs that is consistent with TLS rigid body motion. For these data, the translational motion is represented by the ADPs of the central …
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Librational displacements of silicate tetrahedra in response to temperature and pressure
… SiO₄ silicate tetrahedra in crystals behave as rigid bodies. This conclusion is based on analyses of the atomic displacement factors of Si and O atoms obtained from single crystal diffraction experiments wherein the amplitudes of atomic vibrations are ascribed to translational, librational and …
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Vertical Take-Off and Landing Control via Dual-Quaternions and Sliding Mode
… landing problem}. Through representing rigid body motion with dual-quaternions, translation and rotation can be represented in a single compact form that is free of singularities and provides the shortest path interpolation compared to any other formulation. These rigid bodies will be …
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Formation Fidelity of Simulated Unmanned Autonomous Vehicles through Periodic Communication
… control law. Real-world conditions such as rigid-body motion, swarm dynamics, poor communication, and other phenomena are assessed and discussed. It is concluded through testing in simulation that it is possible to control a formation of boats by directing each boat with a unique set of …
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Physics-Inspired Deep Learning for Inverse Problems in MRI
… we demonstrate a deep learning framework for rigid-body motion correction in MRI, where the forward imaging model informs both the network architecture and the inference procedure. Our method incorporates potentially unknown motion parameters as inputs to the network and then optimizes them …
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Rigid Body Constrained Motion Optimization and Control on Lie Groups and Their Tangent Bundles
<p>Rigid body motion requires formulations where rotational and translational motion are accounted for appropriately. Two Lie groups, the special orthogonal group SO(3) and the space of quaternions H, are commonly used to represent attitude. When considering rigid body pose, that is spacecraft …
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Antarctic tabular icebergs in ocean waves
… iceberg geometry, structure and other features, rigid body motions and surface strains. We show that tabular icebergs respond to ocean waves of medium (15-30 s) and long (>30 s) periods, but that they act as filters to very short (<10 s) period waves. A two-dimensional, linear model of rigid body …
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Real-time measurement of biaxial tensions using digital image correlation methods
… accuracy and speed of the DIC system, for both rigid body motion and deforming targets. A thorough review of the concepts involved in DIC is undertaken followed by a detailed description of the design and build of the system. Ultimately a set of experiments are executed that show that, within a …
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