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 15 of 15 for “"Rotating machines"”.
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Modeling, analysis and control of magnetically levitated rotating machines
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Fault detection in rotating machines by vibration signal processing techniques
Machines with moving parts give rise to vibrations and consequently noise. The setting up and the status of each machine yield to a peculiar vibration signature. Therefore, a change in the vibration signature, due to a change in the machine state, can be used to detect incipient defects before they …
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On-line measurement of partial discharges in high voltage rotating machines.
The on-line condition monitoring of rotating machines is given paramount importance, particularly in Oils and Gas industries where the financial implications of machine shutdown is very high. This project work was directed towards the on-line condition monitoring of high voltage rotating machines …
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A study of seismic response of rotating machines subjected to multi-component base excitation
Rotating machines such as motors, generators, turbines, etc. are crucial mechanical components of modern industrial and power generation facilities. For proper functioning of these facilities during and after an earthquake, it is essential that the rotating machines in these facilities also …
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Bearing Fault Detection and Classification Using Artificial Neural Networks
… are the essential components of modern rotating machines. Bearing faults can cause severe machine damages or even breakdowns.</p> <p>In recent years, artificial intelligence and deep learning have been successfully applied to fault detection. In this thesis, convolutional neural networks …
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Determinação de propriedades dinâmicas do solo no campo para análise de fundações de máquinas rotativas
… for the analysis of massive-type foundations for rotating machines, with special enphasis on the model which represents the soil as a set of springs (Barkan type). With this aim, a rotating mass-type vibrator was designed and constructed. Field tests on a block-type foundation, resting on residual …
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DESIGN AND ANALYSIS OF THE ROTOR OF A FULLY SUPERCONDUCTING MACHINE
… very high specific torque, fully superconducting rotating machines are considered as enabling technology for future turbo-electric propulsion for transportation aircraft. NASA is funding the development of a high fidelity fully superconducting machine sizing tool able to generate optimized designs …
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Shape and Topology Optimization for electro-mechanical energy converters
… energy converters, in particular electrical rotating machines, at the lowest possible cost. The use of modern power electronics converters at all levels of elec- trical power applications, involves, on the other hand, switching components with very low switching times and always increasing …
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Consistent description of radiation damping in transient soil-structure interaction
… with transient excitations as arising from rotating machines at startup and shutdown. The theoretical part of the thesis contains elements of system theory and discusses particularly stability problems arising from the rational approximation. The practical part presents a large amount of …
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Pulsed field magnetization of composite superconducting bulks for magnetic bearing applications
… significant volume and weight reductions for rotating machines despite the need for cooling. A new design of superconducting magnetic bearing has been developed which uses magnetized bulks as the field source, eliminating permanent magnets. Finite element modelling shows that the bulk – bulk …
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Advanced monitoring and advice integrating a comprehensive sensor network for improved operational availability
… through monitoring and advice. First, rotating machines such as turbine generators and reactor coolant pumps are identified as main contributors for the lost availability through the review of pressurized water reactor (PWR) forced outage records. The integrated architecture utilizes …
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Signal processing techniques for on-line partial discharge monitoring of high voltage electrical machines.
Large alternating current electrical machines are found everywhere in modern industry. Traditionally, electrical plants have been highly reliable, primarily because the complexity of their electrical design means that they are generously over-rated. However, modern rotating electrical machines are …
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Modal Analysis Techniques in Wide-Area Frequency Monitoring Systems
… an electric power system is composed of coupled rotating machines (large generators) which have air gap magnetic fields that are essentially static, or quasi-static, the power system may be modeled as a system with energy stored in quasi-static magnetic fields. The magnetic fields in the machines …
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Evaluation of optical techniques applied to online turbomachinery blade vibration measurements
… These present some complications when analyzing rotating machinery. Being contact in nature, mass loading can affect the integrity of measurements captured. Turbomachines typically operate under the adverse conditions of high temperatures, high flow rates and sometimes wet environments. This …
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Effect Of Coriolis And Centrifugal Forces On Turbulence And Transport At High Rotation And Buoyancy Numbers
… problems in fluid flow and heat transfer for rotating machines. The study focuses on gas turbines and electric generators for high temperature and high energy density applications, respectively, both which employ rotating cooling channels so that materials do not fail under high temperature …