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 469 for “"equations of motion"”.
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Twisted and unstable : approaches to the string equations of motion
… we will explore three approaches to aspects of the fundamental structure of string theory. We first provide a brief review of perturbative string theory, and briefly discuss how each of the three topics to be discussed in the body of this thesis depart from this starting point. We then study …
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Combined Loading of Composite Box-Beams with Linearized Differential Equations of Motion
<p>The purpose of the following analysis is to develop a method for determining vertical, horizontal, and torsional displacements of arbitrarily laminated, cantilevered composite box-beam under static, transverse loading. Small deflections are assumed and the differential equations of motion have …
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An investigation of students’ approaches to solving problems using equations of motion
The purpose of this research study is to investigate how to address the under-preparedness of students entering first year physics in South African universities, particularly with regard to their competence in solving kinematics problems. Previous studies show that the best tool for changing and …
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A method for calculating the weak field metric and equations of motion for a plasma.
Thesis: B.S., Massachusetts Institute of Technology, Department of Physics, 1972
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Direct application of the least action principle to solve (human) movement dynamics without using differential equations of motion
This thesis explores the numerical feasibility of solving motion 2-point boundary value problems (BVPs) by direct numerical minimization of the action without using the equations of motion (EOM) as an intermediate step. The proposed direct least action (DLA) approach using the downhill simplex …
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Mathematical modeling and simulation of human motion using 3-dimensional, multi-segment coupled pendulum system : derivation of a generalized formula for equations of motion
The use of mathematical models to investigate the dynamics of human movement relies on two approaches: forward dynamics and inverse dynamics. In this investigation a new modeling approach called the Boundary Method is outlined. This method addresses some of the disadvantages of both the forward and …
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Design criteria and equations of motion for the de-spin of a vehicle by the radial release of weights and cables of finite mass
The equations of motion are derived for the de-spinning of a rigid body payload by the use of weights attached to the ends of unwinding cables of finite mass that are released when colinear with a radius of the payload.
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An Analytical Investigation of Natural Frequency for a Symmetric Composite Box-Beam with Thermal Effects
<p>The main purpose of the following analysis is to develop an analytical method for determining the natural frequency of a symmetric composite box-beam subjected to temperature gradient. A set of coupled partial differential equations of motion is obtained by means of small defection theory and …
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Modeling of the UNLV-Aro light-weight robot using Lagrange's assumed mode method, symbolic manipulation, and numerical simulation
This thesis modeled the dynamics of the UNLV-ARO serially connected light-weight robot. The two outer-most links of the robot exhibited flexible behavior in the in-plane and the out-of-plane directions. Lagrangian mechanics were used to model this system. Assumed modes method was used to …
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Residual flexibility methods for decoupled analysis of integrated structural systems
Methods of dynamic analysis of large structural systems used in aerospace applications are examined. Full-system solutions are undesirable due to computational cost and logistics issues. Traditional substructuring methods effectively reduce system size through truncation of component modes, but …
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Analysis of various forced oscillation techniques for obtaining dynamic stability derivatives
… derivatives for aircrafts at high angle of attack are described. From the general equations of motion of an aircraft in space, the perturbation equations of motion are derived for applying to a wind tunnel aircraft model. Data Reduction and test procedures for important dynamic tests are …
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Movimentos induzidos por vórtices (VIM) de plataformas TLWP submetidas a correntes de alta intensidade
Vortex Induced Motions (VIM) classified as galloping occurs frequently in TLWP Platforms, however these movements are not always correctly taken into account during design phases. This work aimed to develop a formulation that represent this kind of movement for sway and yaw degrees-of-freedom. …
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Effect of membrane weight on vibrations of air-inflated dams
… which have been used in recent years as a means of temporarily impounding water. A number of procedures have been developed to investigate the static behavior of the dams, but the dynamic behavior has been largely neglected. The few studies that have been done on dynamic behavior have used the …
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Roll vibration of a reciprocating air compressor
The rigid-body rotational vibration of a resiliently mounted air compressor about an axis parallel to the axis of the rotor is investigated. An analysis of the motion of the compressor base is conducted using empirical acceleration data. The effect on roll vibration of changing various compressor …
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Six degree of freedom vehicle controller design for the operation of an unmanned underwater vehicle in a shallow water environment
Closed loop control of an unmanned underwater vehicle (UUV) in the dynamically difficult environment of shallow water requires explicit consideration of the highly coupled nature of the governing non-linear equations of motion. This coupling between an UUV's six degrees of freedom (6 DOF) is …
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Maneuver and control of flexible spacecraft
This dissertation is concerned with the problem of slewing large flexible structures in space and simultaneously suppressing any vibrations. The equations of motion for a three-dimensional spacecraft undergoing large rigid-body maneuvers are derived. The elastic motions are assumed to remain in the …
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The elastic constants and wave velocities for an axially symmetric medium
The purpose of this thesis is to investigate the properties and wave velocities for an axially symmetric medium. The investigation consists of four parts. In the first part, the physical properties of the medium are defined. Then the stress-strain relations for the case under consideration are …
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Mathematical modeling, trajectory and vibrations control of a three link flexible robot
The objective of this thesis is to study the dynamics and control of a three link flexible robot. The Lagrange equations are used for deriving the equations of motion of this three link flexible robot. The equations of motion of this robot are derived by using a mathematical and symbolic …
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Second-Order Relative Motion Equations
This thesis 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 …
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Electromagnetic formation flight dipole solution planning
… Formation Flight (EMFF) describes the concept of using electromagnets (coupled with reaction wheels) to provide all of the necessary forces and torques needed to maintain a satellite's relative position and attitude in a formation of satellites. With EMFF, this formation can be controlled …
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