Search

Your search keyword '"Ahmed, Shehab"' showing total 21 results
Start Over Author "Ahmed, Shehab" Search Limiters Full Text Publication Year Range Last 10 years Journal ieee transactions on industrial electronics
21 results on '"Ahmed, Shehab"'

2. An Innovative Pipe Inspection Tool Utilizing Electromagnetic Resonance Coupling and Machine Learning

Author

Mostafa, Tarek M., Ooi, Guang, Ozakin, Mehmet Burak, Khater, Moutazbellah, Zeghlache, Mohamed Larbi, Bagci, Hakan, and Ahmed, Shehab

Abstract

This article describes an advanced tool that uses electromagnetic resonance coupling and machine learning techniques to detect and characterize metal loss on the inner surface of a metallic pipe. The proposed tool uses a transmitter coil placed along the axis of the pipe and four sensor coils installed around the transmitter coil. Any defect on the pipe surface leads to changes in the impedance of the transmitter and sensor coils as well as in the mutual coupling between them, thus creating a detectable variation in the outputs of one or multiple sensor coils. An artificial neural network is developed to reconstruct two-dimensional pipe cross-sections and to completely characterize the defects using these variations. The proposed tool is tested and validated via simulations, and data are collected using an experimental prototype. Results show that the tool can fully characterize the size, location (azimuthal angle), and level (thickness) of metal loss.

Published
2024
Full Text
View/download PDF

21. A Unipolar/Bipolar High-Voltage Pulse Generator Based on Positive and Negative Buck?Boost DC?DC Converters Operating in Discontinuous Conduction Mode.

Author

Elserougi, Ahmed A., Massoud, Ahmed M., and Ahmed, Shehab

Subjects
DIRECT current circuits, DIRECT current electric motors, DIRECT current power transmission, DIRECT current generators, DIRECT currents, PULSE generators, PULSED electroacoustic methods
Abstract

This paper presents a new high-voltage pulse generator, which is based on positive and negative buck-boost (BB) converters fed from a relatively low voltage dc supply. The proposed generator is able to generate unipolar or bipolar high-voltage pulses via operating the BB converters with series or parallel connected outputs respectively using a common input dc source. The components of each converter are rated at half of the pulsed voltage magnitude in the unipolar mode. The converters in the proposed pulse generator operate in discontinuous conduction mode. This enhances system efficiency, as the circuit only operates when it is desired to generate a pulsed output voltage, otherwise the circuit is switched to idle mode with zero current. Detailed illustration of the proposed approach is presented along with a full design of the system components for given output pulse specifications. Finally, simulation and experimental results are presented to validate the proposed concept. [ABSTRACT FROM PUBLISHER]

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results