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Complex dynamics of drill-strings: Theory and experiments
Conference ObjectAbstract: We investigate complex drill-string dynamics in a downhole drilling where strong nonlinear interactiPalabras claves:Autores:Kapitaniak M., Marian Wiercigroch, Nandakumar K., Vaziri V.Fuentes:scopusBifurcation analysis of a jeffcott rotor with a bearing clearance: Numerics and experiments
Conference ObjectAbstract: We introduce a two-degrees-of-freedom, non-smooth model of a Jeffcott rotor with a bearing clearancePalabras claves:Autores:Joseph Páez Chávez, Marian Wiercigroch, Vaziri V.Fuentes:googlescopusBifurcation scenarios in helical buckling of slender rods using new FE
ArticleAbstract: We develop a new Finite Element to accurately model twisting of rods and capture the bifurcation scePalabras claves:Bifurcations, finite element, Helical buckling, Post-buckling configurations, Twisted rodsAutores:Kapitaniak M., Marian Wiercigroch, Vaziri V.Fuentes:scopusControl Method to Suppress Stick-slip in Drill-strings Featuring Actuation Delay and Constraints
Conference ObjectAbstract: In this work, performance of a modified-integral resonant controller with integral tracking is invesPalabras claves:Control of constrained systems, delay systems, Output feedback control, Parameter-varying systems, trackingAutores:Aphale S.S., MacLean J.D.J., Marian Wiercigroch, Vaziri V.Fuentes:scopusApplication of Resonance Enhanced Drilling to coring
ArticleAbstract: This paper aims to evaluate the applicability of Resonance Enhanced Drilling (RED) technology to corPalabras claves:Core quality assessment, Coring, drilling, experimental studiesAutores:Kapitaniak M., Li S., Marian Wiercigroch, Millett J.M., Vaziri V.Fuentes:scopusFinite element analysis of drill pipe-slip system
ArticleAbstract: As an important tool for tripping of a drill-string, a drill-pipe (DP)-slip system directly affectsPalabras claves:Drill-pipe, finite element analysis, Friction, Slip insert, Stress distributionAutores:Guo B., Kapitaniak M., Marian Wiercigroch, Tang L., Vaziri V.Fuentes:scopusEnergy saving by reducing motor rating of sucker-rod pump systems
ArticleAbstract: Energy industry can make significant savings by reducing electric motors ratings of the popular SuckPalabras claves:ENERGY SAVING, Motor control, Open and closed-loop frequency control, Sucker-rod pumping systemAutores:Aphale S.S., Dong S., Li W., Marian Wiercigroch, Vaziri V.Fuentes:scopusExperimental control for initiating and maintaining rotation of parametric pendulum
ArticleAbstract: In this paper, the authors have studied experimentally the control methods of a parametric pendulumPalabras claves:Autores:Marian Wiercigroch, Najdecka A., Vaziri V.Fuentes:scopusExperimental studies of forward and backward whirls of drill-string
ArticleAbstract: In this work we investigate forward and backward whirls of a drill-string using a novel experimentalPalabras claves:Co-existing attractors, Drill-string dynamics, experimental studies, Forward and backward whirls, Lateral vibrationAutores:Joseph Páez Chávez, Kapitaniak M., Marian Wiercigroch, Vaziri V.Fuentes:googlescopusDynamics and frequency and voltage control of downhole oil pumping system
ArticleAbstract: The motor load torque of a typical pumping system employed in onshore oil-fields has a fluctuating ‘Palabras claves:Dynamics, Electro-mechanical model, ENERGY SAVING, Frequency and voltage control, Pumping systemAutores:Aphale S.S., Dong S., Li W., Marian Wiercigroch, Vaziri V.Fuentes:scopus