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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 151 for “"Relative Motion"”.
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Second-Order Relative Motion Equations
… presents an approximate solution of second order relative motion equations. The equations of motion for a Keplerian orbit in spherical coordinates are expanded in Taylor series form using reference conditions consistent with that of a circular orbit. Only terms that are linear or quadratic in …
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Optimization-Based Guidance for Satellite Relative Motion
Spacecraft relative motion modeling and control promises to enable or augment a wide range of missions for scientific research, military applications, and space situational awareness. This dissertation focuses on the development of novel, optimization-based, control design for some representative …
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Using a Curvilinear Coordinate System for Satellite Relative Motion
The number of dynamics needed to model the motion between a Chief and Deputy satellites has grown greatly since the introduction of the Hill, Clohessy-Wilshire (HCW) equations of motion were introduced. The models have grown to include various things like perturbations, specifically drag, J2, and …
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Dynamics and Control of Satellite Relative Motion: Designs and Applications
… problems in the perspective of large-scale relative motion without perturbations. Specifically, we develop an exact and efficient analytic solution of satellite relative motion using a direct geometrical approach in spherical coordinates. The resulting solution is then transformed into …
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Response of blade-row to upstream vortical disturbance in relative motion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Neural responses to relative motion in V1 and V2 of macaque monkeys
Relative motion information is required for solving many complex visual tasks, such as depth perception by motion parallax and motion-induced figure/ground segmentation. However, little is known about the neural substrate for relative motion. To explore the neural mechanisms underlying relative …
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A* Node Search and Nonlinear Optimization for Satellite Relative Motion Path Planning
… be expanded to apply to a variety of satellite relative motion trajectory planning problems.
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Unstructured grid technologies for hydrodynamic applications with bodies in relative motion and mesh deformation
… for hydrodynamic applications with bodies in relative motion and mesh deformation are presented. A parallel universal mesh deformation scheme is developed to manage deforming surface and volume grids for both aerodynamic and hydrodynamic applications. The approach is universal and independent …
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A new first order solution to the relative motion problem with applications to intercept and rendezvous
… first order linearized solution, describing the relative motion between an interceptor vehicle and a target vehicle in a circular orbit, has been developed by means of a transformation of the variables which occur in the differential equations of relative motion. The results of this analysis are …
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Validation and Analysis of Model-Predicted Patellar Implant-Synthetic Bone Relative Motion in Cementless Total Knee Replacement During a Single-Leg Lunge
… however, few cementless patellar implant micromotion tests have been developed. Previous studies were all focused on qualifying tibial micromotion, experimentally measuring relative motion between the tray and bone or computationally predicting micromotion at the tibial tray-bone interface …
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Hardware Testbed for Relative Navigation of Unmanned Vehicles Using Visual Servoing
… and submersible vehicles will require precise relative navigation capabilities to accomplish missions such as formation operations and autonomous rendezvous and docking. The development of relative navigation sensing and control techniques is quite challenging, in part because of the difficulty …
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A vibration analysis of a bearing/cartridge interface for a fretting corrosion study
The relative motion between a ball bearing outer race and the bearing's cartridge was investigated. The investigation was part of a larger program, the objective of which is to examine the important parameters influencing fretting corrosion in rolling element bearings. The bearing examined was a …
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Spacecraft Trajectory Planning for Optimal Observability using Angles-Only Navigation
… methods for spacecraft under constrained relative motion. The resulting contribution is a guidance method for impulsive rendezvous and proximity operations valid for elliptic orbits of arbitrary eccentricity.</p> <p>The system dynamics describe the relative motion of an arbitrary number of …
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Autonomous Space Surveillance for Arbitrary Domains
… and a dynamics modeling component for three-body relative motion.</p> <p>For the image processing component, resident space objects, (commonly referred to as RSOs) which are satellites or orbiting debris are identified in optical images. Two methods of identifying RSOs in a set of images are …
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The effects of the slip amplitude and lubricant type on the rate of false brinelling in roller bearings
… via the machinery foundations, and result in relative motion between the rollers and the races. This results in wear scars at the point of contact between the rollers and the race. The wear scars result in premature failure of the bearings. There are a large number of parameters that affect …
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Tectonic evolution and midplate volcanism in the South Pacific
… with small changes in Pacific-Farallon relative motion. The simple flexural signal of a locked fracture zone may be obscured by tectonic effects, and there is no evidence for the release of shear stress on the fracture zone by vertical slip after leaving the active transform. One such …
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Realization of a Measuring Device for Recordning the Relative Movement between Residual Limb and Prosthetic Socket
Relative motion between residual limb and prosthetic socket is an indication of poor fit. Both the fabrication and fitting processes are highly subjective and a favorable result depends upon the technician's expertise. Although numerous methods exist to measure the relative motion, all have …
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Model predictive control for formation flying spacecraft
… pursuing two areas of advancement: extensions of relative linear dynamics models and assessment and mitigation of sensor noise effects on control systems. Relative dynamics models play an important role in finding drift-free initial conditions for spacecraft formations and for designing feedback …
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Fluctuation-induced phenomena in non-equilibrium systems
… possibly even far, from equilibrium due to their motion either in or out of thermal equilibrium. This subject encompasses several topics in physics including the dynamical Casimir effect in the presence of moving boundaries, and non-contact friction between objects in relative motion. In both …
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