シャ　キンカ   Jinhua She   佘　錦華    所属   工学部 機械工学科    職種   教授
言語種別	英語
発行・発表の年月	2017/12
形態種別	国際会議論文
査読	査読あり
標題	Downhole-Friction-Estimation-Based Rotary Speed Control for Drillstring System with Stick-Slip Vibrations
執筆形態	共著
掲載誌名	The 11th Asian Control Conference (ASCC 2017)
掲載区分	国外
出版社・発行元	IEEE
巻・号・頁	pp.2618-2623
担当範囲	All
著者・共著者	Chengda Lu, Min Wu, Xin Chen, Weihua Cao, Chao Gan, and Jinhua She
概要	In a drilling process, stick-slip vibrations are one of the main resources resulting in unstable motions or drillstring failures. In this paper, combined with a LuGre bit-rock interaction, the drillstring system is modeled as lumped parameters to capture the main features of stick-slip vibrations. Then, a novel control conguration involving ve modules is developed in order to track a desired speed while suppressing the vibration, where the equivalent-input-disturbance method is skilfully employed to suppress such vibrations. In such ve modules, the state observer is combined with the friction estimator to obtain the equivalent friction torques, which are corresponding to downhole frictions, on the surface control platform. In addition, the internal model and the state feedback are utilized to get the speed tracking torques so as to guarantee the desired tracking precision. Based on the dual conversion and two quadratic performances, the closed-loop stability is guaranteed by appropriate design of the controller and observer's gain matrices. Simulation is conducted to compare our method with an LQR method, showing our method's superiority and effectiveness.