@inproceedings{8f128d4f2c7f488ebe791d6168f4c45a,
title = "An optimized chattering free sliding mode controller to suppress torsional vibrations in drilling strings",
abstract = "The discontinuous control signal in a sliding mode controller causes significant problems of chattering. A smooth control signal is important if the controller is to suppress torsional vibrations in drillstrings. This is mandatory to avoid placing the expensive top-drive under loads of oscillatory torque; maintaining its integrity and minimizing maintenance costs. A chattering free sliding-mode controller optimized using a Particle Swarm Optimization (PSO) routine is proposed to avoid bit sticking phenomena and in addition, provide a smooth control signal to the top drive system. In this work, a discontinuous lumped-parameter torsional model of four degrees of freedom is considered, and the bit-rock contact is taken to be a variation of the Stribeck friction together with the dry friction model.",
keywords = "Chattering, drilling strings, Particle swarm optimization, Sliding mode, Stick-slip",
author = "Fouad, {Tarek Ahmed} and Abdel-Magid, {Y. L.} and Khalid Alhammadi and Hamad Karki",
year = "2011",
doi = "10.1109/IEEEGCC.2011.5752608",
language = "British English",
isbn = "9781612841199",
series = "2011 IEEE GCC Conference and Exhibition, GCC 2011",
pages = "573--576",
booktitle = "2011 IEEE GCC Conference and Exhibition, GCC",
note = "2011 IEEE GCC Conference and Exhibition, GCC 2011 ; Conference date: 19-02-2011 Through 22-02-2011",
}