Browsing by Author "Alqaradawi, M. Y."
Now showing items 1-5 of 5
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Drill string nonlinear vibrations: Experimental studies and finite-element analysis
Kanzari M.; Shahin I.M.; Alqaradawi M.Y.; Balachandran B. ( Institute of Physics Publishing , 2018 , Conference Paper)In the present work, nonlinear vibrations of drill strings are studied. A laboratory scale arrangement consisting of a flexible rod with rotor-stator system is used to study the system dynamics. A finite-element model has ... -
Guided ultrasonic wave tomography of a pipe bend exposed to environmental conditions: A long-term monitoring experiment
Simonetti, F.; Alqaradawi, M.Y. ( Elsevier Ltd , 2019 , Article)Continuous monitoring of corrosion damage in pipelines requires sensor systems that can achieve high precision (repeatability) to detect and size subtle wall thickness (WT) losses. In fact, corrosion typically progresses ... -
Linear stability analysis of finite length journal bearings in laminar and turbulent regimes
Miraskari, Mohammad; Hemmati, Farzad; Alqaradawi, M. Y.; Gadala, Mohamed S. ( SAGE Publications Ltd , 2017 , Article)Dynamic coefficients of a finite length journal bearing are numerically calculated under laminar and turbulent regimes based on Ng-Pan-Elrod and Constantinescu models. Linear stability charts of a flexible rotor supported ... -
Nonlinear stochastic drillstrings vibrations: Parametric study for stick-slip suppression
Alqaradawi M.Y.; Kanzari M.; Balachandran B. ( Institute of Physics Publishing , 2018 , Conference Paper)Unstable vibrations caused by the transition between static and kinetic frictions produces stick-slip motions which is one of the primary causes of poor drilling efficiency and mechanism failure in the drilling process. ... -
A Robust Modification to the Universal Cavitation Algorithm in Journal Bearings
Miraskari, Mohammad; Hemmati, Farzad; Jalali, Alireza; Alqaradawi, M. Y.; Gadala, Mohamed S. ( American Society of Mechanical Engineers , 2016 , Article)In the current study, a modified fast converging, mass-conserving, and robust algorithm is proposed for calculation of the pressure distribution of a cavitated axially grooved journal bearing based on the finite volume ...