TY - GEN
T1 - ℒ1adaptive controller for a rotary steerable system
AU - Sun, Hui
AU - Li, Zhiyuan
AU - Hovakimyan, Naira
AU - Başar, Tamer
AU - Downton, Geoff
PY - 2011
Y1 - 2011
N2 - The downhole directional steering system captures mechanical connections and interactions between different parts. Due to the spatial delays, parametric uncertainties and modeling inaccuracies in the system, the closed-loop stability and robust performance are challenging problems to address. Towards this goal, the current paper presents an ℒ1 adaptive controller which drives the output of the system, i.e. the borehole propagation angle, according to the operator's commands in the presence of uncertainties and disturbances. Specifically, the paper considers the Explicit Force, Finitely Sharp, Zero Mass (EFFSZM) model with spatial delays in the state. The closed-loop system response is shown to have uniform transient performance bounds with respect to a bounded reference system. The performance bounds can be improved by increasing the adaptation rate. The predictable response to the commands is demonstrated in simulations.
AB - The downhole directional steering system captures mechanical connections and interactions between different parts. Due to the spatial delays, parametric uncertainties and modeling inaccuracies in the system, the closed-loop stability and robust performance are challenging problems to address. Towards this goal, the current paper presents an ℒ1 adaptive controller which drives the output of the system, i.e. the borehole propagation angle, according to the operator's commands in the presence of uncertainties and disturbances. Specifically, the paper considers the Explicit Force, Finitely Sharp, Zero Mass (EFFSZM) model with spatial delays in the state. The closed-loop system response is shown to have uniform transient performance bounds with respect to a bounded reference system. The performance bounds can be improved by increasing the adaptation rate. The predictable response to the commands is demonstrated in simulations.
UR - http://www.scopus.com/inward/record.url?scp=85032069317&partnerID=8YFLogxK
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U2 - 10.1109/ISIC.2011.6045424
DO - 10.1109/ISIC.2011.6045424
M3 - Conference contribution
AN - SCOPUS:85032069317
SN - 9781457711046
T3 - IEEE International Symposium on Intelligent Control - Proceedings
SP - 1020
EP - 1025
BT - 2011 IEEE International Symposium on Intelligent Control, ISIC 2011
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2011 IEEE International Symposium on Intelligent Control, ISIC 2011
Y2 - 28 September 2011 through 30 September 2011
ER -