Disturbance rejection of offshore drilling platforms: An equivalent-input-disturbance-based dynamic positioning...

Area of Science:

• Ocean Engineering
• Control Systems
• Robotics

Background:

• Offshore drilling platforms face significant operational challenges due to environmental disturbances like wind, waves, and currents.
• Reliable station-keeping is crucial for the safety and efficiency of these platforms.
• Existing dynamic positioning systems require enhanced disturbance rejection capabilities.

Purpose of the Study:

• To propose a novel dynamic positioning method for offshore drilling platforms.
• To improve the estimation and suppression of unknown environmental disturbances.
• To enhance the overall performance and stability of the station-keeping system.

Main Methods:

• Implementation of an improved equivalent-input-disturbance (EID) estimator.
• Decoupling of input channels using linear transformation.
• Optimization of observer and controller parameter tuning.

Main Results:

• Significantly enhanced disturbance-rejection performance in the dynamic positioning system.
• Improved system performance through optimized parameter tuning and input channel decoupling.
• Mathematical proof of bounded-input bounded-output stability for the closed-loop system.

Conclusions:

• The improved EID approach offers a robust solution for dynamic positioning of offshore drilling platforms.
• The method effectively addresses unknown disturbances, leading to more reliable station-keeping.
• This research provides valuable insights for the design of advanced dynamic positioning systems.