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 24 for “"ELECTROMAGNETIC FORCES"”.
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Theory of Wave Formation in Liquid Metal
… of the ZaP-HD and FuZE, a plasma column exerts electromagnetic forces and pressure on a solid electrode wall. The pressure exerted by the plasma column is called the magnetic pressure. In the Virginia Tech device magnetic pressure is exerted by a wire onto the liquid metal electrode. The …
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Small oscillations of a beam-column with finite electrical conductivity in a constant transverse magnetic field
… the bar causes only a weak perturbation in the electromagnetic-field. The frequency equation is derived for a column and reduced to that for free vibration of a beam by equating the end load to zero. The roots of this equation are obtained approximately and the effect of the magnetic field on …
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Extraordinary light-induced local field, angular momentum and force near metallic nanoparticles
… nanoparticles can induce remarkably large electromagnetic field gradients near their surfaces, which can excite dipole-forbidden transitions in nearby atoms or molecules and provide unique spectroscopic fingerprinting for chemical and bimolecular sensing. We introduce the concept of the …
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Development and validation of an Electromagnetic Formation Flight simulation as a platform for control algorithm design
Electromagnetic Formation Flight (EMFF) consists of using electromagnetic forces to position or orient satellites in a relative target location or attitude and achieve a certain target formation on orbit. This thesis introduces the fundamental equations of EMFF and the design of the Resonant …
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Power System Fault Detection Using Conductor Dynamics
… accurate representation of conductor response to electromagnetic forces generated during system faults. Bundled rigid conductors have advantages including detection independent of system load currents and improved ability to detect polyphase and single phase faults. The dynamic motion of the …
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The influence of unbalanced magnetic pull on the reliability of induction motors
… writer's thesis that the effects of the radial electromagnetic forces, including the unbalanced magnetic pull due to airgap eccentricity must be carefully taken into account in the design and construction of induction motors in order to achieve high reliability. The following preface provides an …
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Optical momentum transfer to macroscopic media
… to apply an alternate approach to predicting the electromagnetic force on material. Direct application of the Lorentz force to media allows for the computation of electromagnetic forces while avoiding a priori assumptions for the form of optical momentum. In this view, the forces exist everywhere …
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Parametric Investigation of the Core Geometry of an IPMSM to Reduce Vibrations
… core. The goal is to minimize the effect of the electromagnetic forces acting on the stator teeth, over a range of rotational speeds that simulates real working condition of a passenger vehicle traction motor, which in turns allows to mitigate the vibrations of the motor and improve comfort of …
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Development of a test of Newton's law of gravitation at micrometer distances using a superconducting spherical torsion balance
… shield between them. The expected Newtonian and electromagnetic forces have been studied to optimise the design of the masses. The torque sensitivity of the SSTB has been modelled and its performances at 4.2 K discussed. A torque sensitivity of 2×10\(^{−10}\) Nm/√(Hz) at 30 mHz has been measured, …
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Path planning and position control and of an underactued [sic] electromagnetic formation flight satellite system in the near field
Electromagnetic formation flight is the process of using electromagnetic actuators (coils) on multiple spacecraft to produce relative (internal) forces in order to control the relative position and orientation of the spacecraft. This thesis demonstrates the ability to experimentally generate the …
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Dynamic and thermal control of an electromagnetic formation flight testbed
… this relative position control is to use electromagnetic interaction between the vehicles of the formation to provide forces and torques. This method uses electricity alone, which is a renewable resource in space, to provide all actuation to control the formation. The Space Systems …
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Double-frequency stator core vibration in large two-pole turbogenerators
… for an on-line monitoring scheme.<br/><br/>Electromagnetic forces at the stator bofe are represented as tooth-tip forces formed from the integral of Maxwell stress over a slot pitch. Conversion to core-back vibration is by means of transfer coefficients derived from structural finite-element …
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The finite element of modelling of the dynamic behaviour of a transmission line conductor
… loads (in the case of aeolian vibration), electromagnetic forces (due to short circuit currents) and the loads experienced by a conductor in the wake of another, are discussed in the thesis.
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Analyzing the Wien filters for the DANTE ion accelerator
… are of the same species. Wien filters use electromagnetic forces to filter particles in an ion beam. Also referred to as mass selectors or velocity selectors, Wien filters operate on the principles of the Lorentz force in order to select ions of a certain mass while filtering out all …
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High-temperature superconductors as electromagnetic deployment and support structures in spacecraft
… necessary to build a truss or apply surface forces to a spacecraft structure. We instead look at using electromagnetic body forces generated by HTSs to reduce the need for material, load bearing support, and standoffs on spacecraft by maintaining spacing, stability, and position of elements …
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A finite element method for the fully-coupled magnetohydrodynamics
… which are extended to account for the Lorentz forces, and by Maxwell equations from which the magnetic induction equation is obtained. Magnetohydrodynamic problems are, thus, interdisciplinary and coupled in a two-way fashion, since the effect of the velocity field appears in the magnetic …
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Bridging conduction and radiation : investigating thermal transport in nanoscale gaps
… understood by the exchange of heat through the electromagnetic field. Typically conductance values in the far field radiation regime are on the order of 5 W/m²K, whereas contact conductance is on the order of 108 W/m²K. While near field radiation experiments have reached separations down to on …
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Evolution of radial force balance and radial transport over L-H transition
… radial force balance between pressure gradient forces and electromagnetic (radial electric field and VxB) forces require radial particle fluxes to satisfy a pinch-diffusion relation. A recent study suggests that the major difference between L-mode and H-mode are associated with the …
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Wireless bicycle assist : structural analysis of outer casing
… to prevent failure from shearing due to the electromagnetic forces created by the motor coils. In addition, aesthetics and ease of assembly and servicing were also considered in the design of the device. The area of the outer casing that surrounds the spoke-holes was analyzed using the …
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Slot discharge characteristics of high voltage machines.
… under the influence of naturally occurring electromagnetic forces leads to physical abrasion of the corona screen, and thereby the initiation of slot discharge. At least three different modes of slot discharge are possible following fragmentation of the corona screen, each generating …
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