Suppression of axial-torsional vibrations in drilling system described by neutral-type delay differential equations

S. Tashakori, Gholamreza Vossoughi, Hassan Zohoor, Nathan van de Wouw

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Abstract

Vibrations in deep drilling systems lead to efficiency deterioration and may even cause the system failure. In this paper, a controller is designed aiming at mitigation of these vibrations, which is based on a neutral-type time delay model that represents distributed axial and torsional dynamics. First, the stability of the associated linearized dynamics is analyzed using a spectral approach. Furthermore, the open-loop system is shown to be stabilizable by state feedback which supports subsequent controller design. An optimization-based continuous pole placement technique has been employed to design a stabilizing controller, which mitigates steady-state drill-string vibrations. The effectiveness of the controller is shown in a representative case study.
Original languageEnglish
Title of host publicationProceedings of the First International Nonlinear Dynamics Conference (NODYCON2019)
Publication statusPublished - 2019
EventNODYCON 2019 : First International Nonlinear Dynamics Conference - Rome, Italy
Duration: 17 Feb 201920 Feb 2019
https://nodycon.org/2019/

Conference

ConferenceNODYCON 2019 : First International Nonlinear Dynamics Conference
Country/TerritoryItaly
CityRome
Period17/02/1920/02/19
Internet address

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