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 14 of 14 for “"vibration signals"”.
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Multichannel inverse filtering of machinery vibration signals
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1983.
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The analysis of vibration signals during induction motor starting transients with a view to early fault detection.
… the monitoring and analysis of stator core vibration signals during no-load starting transient on a 3-phase induction motor with specifically introduced stator-rotor eccentricity. Records of stator core vibration signals during full voltage, direct on line starting transients for various …
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Condition Assessment of Civil Infrastructure and Materials Using Deep Learning
… vehicle classification by asphalt pavement vibration. This work first applied the pavement vibration IoT monitoring system to collect raw vibration signals and performed the wavelet transform to obtain denoised vibration signals. Then this work represented the vibration signals in two …
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Data-driven and Model-based Bearing Fault Analysis - Wind Turbine Application
… for wind turbine generator bearings including vibration data analysis, and modeling of bearing outer race faults to understand how the vibration signal develops as the faults progresses. Case studies from large wind turbines are described where amplitude and phase demodulation are used to …
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Strategies for Removing Non-stationary Effects in Machine Diagnostics using Model-driven and Artificial Intelligence Techniques
… gears and bearings via processing of measured vibration signals play an important role in improving the reliability of industrial machines. Gear and bearing faults can be diagnosed using different frequency and time-frequency domain approaches, as they occur at specific fault characteristic …
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Quantification of Cumulative Load on the Knee using a Vibration Emission Method
… to deform. This can result in changes of vibration characteristics of the joint surfaces. Differences in the vibration characteristics of normal and pathological joints have been established and used in the past for classifying severity of disease. The purpose of this study was to examine …
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AUTOMATIC ON-LINE FAULT DETECTIONALGORITHM FOR HYDRAULIC TURBINES
… on-line methods for diagnosis in turbines is vibration analysis. By mounting some acceleration transducers on the bearings of turbines, we can measure the vibration of the system and after that by doing some post processing; we can decide that the turbine’s condition is normal or no. Also …
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Terrain identification methods for planetary exploration rovers
… The second method classifies terrain based on vibrations induced in the rover structure by rover-terrain interaction during driving. Vibrations are measured using an accelerometer on the rover structure. The method uses a supervised learning approach to train a classifier to recognize terrain …
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Structural damage detection using signal-based pattern recognition
… with a single or limited number of input/output signals. This method is based on the extraction of sensitive features of the structural response under a known excitation that present a unique pattern for any particular damage scenario. Frequency-based features and time-frequency-based features of …
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Remote monitoring and fault diagnosis of an industrial machine through sensor fusion
… from different sensors. First, sound, vibration and vision signals are acquired from the machine using a microphone, an accelerometer and a digital CCD camera, respectively. Second, the sound and vibration signals are transformed into the frequency domain using fast Fourier …
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Intelligent fault diagnosis of gearboxes and its applications on wind turbines
… wind turbine gearbox monitoring systems based on vibration signal analysis. Although various vibration based fault detection and diagnosis techniques for gearboxes exist in the literature, it is still a difficult task especially because of huge background noise and a large solution search space in …
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Investigation on no-load mechanical endurance and electrical degradation of a circuit breaker model under short circuit current interruption
… and pumping motor current as well as additional vibration technique were carried out in both laboratory and field test. The investigation on electrical erosion focusing on aging of nozzle and electrode under current interruption was performed with a reduced-size SF6 self-blast circuit breaker …
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In situ blocked force measurement in gearboxes with potential application for condition monitoring
… competing condition monitoring methods based on vibration signal analysis. This thesis summarizes the research steps taken after a review of (i) current maintenance strategies, (ii) gearbox condition monitoring techniques and gear vibration fundamental and common gearbox failure modes, (iii) new …