Robust recoil control of deepwater drilling riser system with input time delay
The recoil response of a riser after emergency disconnection is a complex and hazardous process,compounded by time delays in tensioner system adjustments and signal transmission.Thus,controlling recoil with time-varying and bounded input time delays presents a significant challenge.To address the recoil control problem under input time delays,a time-de-lay state feedback robust H∞ control method was proposed.A dynamic model of riser recoil was developed and transformed into a state-space representation that incorporates input time delays.A closed-loop system was achieved using memory-free state feedback,and stability conditions were determined through matrix inequalities,which were linearized by introducing ad-justable parameters.The differential evolution(DE)algorithm was employed to identify optimal adjustment parameters,ad-dressing the issues of unsolvable linear matrix inequalities or difficulties in finding optimal solution due to improper parameter choices.The proposed method's correctness and feasibility were validated by a finite element model.Results indicate that this method effectively controls riser recoil under both fixed and variable input delays,outperforming conventional control methods that do not account for delay.The DE algorithm reliably identifies optimal parameters,enhancing control perform-ance.Time delays decrease both recoil response and control performance,so minimizing time delays is essential.
deepwater drillingriser systemtensioneremergency disconnectionrecoil control
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维普
