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Item Control Method to Suppress Stick-slip in Drill-strings Featuring Actuation Delay and Constraints(2021) Maclean, James; Vaziri, Vahid; Wiercigroch, Marian; Aphale, Sumeet S.; University of Aberdeen.Engineering; University of Aberdeen.Centre for Applied Dynamics Research (CADR)Item Chaos in Impact Oscillators not in Vain : Dynamics of New Mass Excited Oscillator(2020-10) Danulussi Alves Costa, Dimitri; Vaziri, Vahid; Kapitaniak, Marcin; Kovacs, Stephane; Pavlovskaia, Ekaterina; Savi, Marcelo A.; Wiercigroch, Marian; University of Aberdeen.Engineering; University of Aberdeen.Centre for Applied Dynamics Research (CADR); University of Aberdeen.Engineering; University of Aberdeen.Vice Principals; University of Aberdeen.EnergyItem Dynamics and frequency and voltage control of downhole oil pumping system(2020-05-01) Li, Weicheng; Vaziri, Vahid; Aphale, Sumeet S; Wiercigroch, Marian; University of Aberdeen.Centre for Applied Dynamics Research (CADR); University of Aberdeen.Engineering; University of Aberdeen.EnergyItem Versatile mass excited impact oscillator(2020) Wiercigroch, Marian; Kovacs, Stephane; Zhong, Shun; Danulussi Alves Costa, Dimitri; Vaziri, Vahid; Kapitaniak, Marcin; Pavlovskaia, Ekaterina; University of Aberdeen.Energy; University of Aberdeen.Centre for Applied Dynamics Research (CADR); University of Aberdeen.Engineering; University of Aberdeen.EngineeringItem Experimental studies of forward and backward whirls of drill-string(2018-02-01) Kapitaniak, Marcin; Vaziri, Vahid; Páez Chávez, Joseph; Wiercigroch, Marian; University of Aberdeen.University of Aberdeen; University of Aberdeen.Engineering; University of Aberdeen.Centre for Applied Dynamics Research (CADR); University of Aberdeen.Energy