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 35 for “"Rotating Machinery"”.
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Condition monitoring and fault detection of inverter-fed rotating machinery
Condition monitoring of rotating machinery is crucial in industry. It can prevent long term outages that can prove costly, prevent injury to machine operators, and lower product quality. Induction motors, often described as the workhorse of industry, are popular in industry because of their …
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Methodologies for remaining useful life estimation with multiple sensors in rotating machinery
… of failure prognosis methods (prognostics) in rotating machinery with use of multiple sensors digital signal processing and machine learning techniques. The motivation stems from the void in literature concerning prognostics in meshing gearboxes. Moreover, there are several but inconclusive …
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An investigation of two methods of measuring the acceleration of rotating machinery
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1929.
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Machine learning techniques for the health monitoring of rotating machinery in nuclear power plants
… in application to the health monitoring of rotating plant items being used in the primary and secondary cycles of the Advanced Gas-cooled Reactor (AGR) nuclear power plants in the UK. The methods fall broadly into two categories: the statistical augmentation of a pre-existing knowledge-based …
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A personal computer based instrumentation system for determining real-time dynamic torque in rotating machinery
… torques is important in the dynamic analysis of rotating machinery as it provides insight into the internal state of the machine. Existing methods are difficult to implement, results are not obtained in real-time and are not very accurate. This thesis introduces a new method of determining …
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Application of Data Mining Algorithms for the Improvement and Synthesis of Diagnostic Metrics for Rotating Machinery
… components. Data was collected from multiple rotating components from several hundred rotorcraft and from a laboratory setup of the same components. Preconditioning filters for noise reduction and dimensionality reduction were performed, and it was found that for all components in the study, …
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IMTS (Intelligent Monitoring and Trending System)a PC-based monitoring, evaluation and trending system for rotating machinery
Analysis of rotating machinery requires the collection and evaluation of large quantities of data. For just one machine, the amount of data may become so overwhelmingly great that a thorough examination of all the data is rendered impractical. <b>IMTS</b> (Intelligent Monitoring And Trending …
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Development of the second-generation IMTS (Intelligent Monitoring and Trending System) and WOT (Wizard of Tech) expert system for rotating machinery
… to continuously monitor large numbers of rotating machinery, evaluate each machine's condition through a series of user-definable standards, and alert operators to potential problems. This system requires a rack of data acquisition equipment located near the machines being monitored and a …
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Electrostatic vibration-to-electric energy conversion
… and is based on vibration levels typical of rotating machinery, which are around 2% of the acceleration of gravity from 1-5 kHz. The converter consists of a square centimeter with a 195 mg proof mass which travels ±200 pm. This mass and travel can couple to a sinusoidal acceleration source of …
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Naval applications of enhanced temperature, vibration and power monitoring
… method to continuously assess the condition of a rotating machinery system using vibration analysis during the machine's spin-down. A method to determine the thermal storage capacity of a structure, so that HVAC loads can be more effectively managed, is also explained. Finally, the potential …
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Advanced analysis of rotor-bearing systems for stability and response
… in the analysis and design of industrial turbo machinery. Rotor dynamics deals predominantly with the evaluation of the stability and damped critical speeds, and the response to an unbalance excitation, of turbomachinery. The majority of the industries which deal with rotor dynamics use the …
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A handheld DSP based vibration analyzer
… held vibration analyzer for use on electrical rotating machinery. The analyzer gathers data from an accelerometer and can present either acceleration, velocity or displacement information. Any information can be presented to the user in either the time or frequency domain. Numerical …
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Stability Analysis of a Turbocharger for Marine Diesel Engine Service
… is essential to the life span of any piece of rotating machinery; it becomes increasingly critical in high-speed machinery such as turbochargers. Large turbochargers, such as those found in marine diesel propulsion engines where the rotor alone often exceeds forty pounds, require careful …
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Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings
… in a wide range of both old and new, advanced rotating machinery designs. To maintain existing machinery, as well as to design new, state of the art machines, validated analytical models for these bearings are needed. This work documents the development and evaluation of an automated test rig …
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Engineering applications of electro-rheological fluids
… of a clutch or direct coupling device between rotating machinery. The third application is of more exploratory type. It deals with switching the shape of an airfoil in flight between two different profiles. The purpose of such switching action is to exploit different aerodynamic properties of …
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Design of a Low-Cost Data Acquisition System for Rotordynamic Data Collection
… data. The DAQ was designed to collect data from rotating machinery spinning at a speed up to 10,000 RPM and send this data to a computer through a USB 2.0 full-speed connection. Multitasking code was written for the DAQ to allow for data to be simultaneously collected and transferred over USB. …
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MEMS turbomachinery rotordynamics : modeling, design and testing
… of the bearings supporting the high-speed rotating machinery. This thesis presents the analysis, design, microfabrication, testing and operation of high speed micro-hydrostatic gas bearings for microturbomachinery in power-MEMS applications. A novel turbine driven microbearing test device …
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Time Aliasing Methods of Spectrum Estimation
… in the applications of system identification and rotating machinery signature analysis.
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An expert system for off-line analysis of rotating equipment
The analysis of rotating equipment difficulties is currently accomplished by a specialist in rotating equipment examining the signs and symptoms of the equipment, applying his expert judgement, and determining the cause of the machine's difficulty. This thesis covers the development of an off-line …
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