Dynamic Positioning Controller Thrust Prediction
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Solution Overview
Problem
Dynamic positioning systems are energy intensive due to constant adjustments in thrust to maintain vessel position and heading, leading to high fuel consumption and emissions.
Innovation Solution
A dynamic positioning system with a controller that predicts maximum radial position and heading errors, calculating constant thrust forces and moments for efficient control within defined working and operating areas, reducing thruster activity and energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If constant adjustments in thrust are made to maintain vessel position and heading, then positioning accuracy is improved, but fuel consumption increases
Solution Approach 1:
The system implements periodic control by adjusting thrust forces only when position or heading errors exceed predetermined thresholds, rather than continuously adjusting. This periodic action maintains positioning accuracy while significantly reducing fuel consumption by eliminating unnecessary thruster adjustments when the vessel is already within acceptable parameters.
Solution Approach 2:
The system changes control parameters dynamically by switching between different thrust adjustment strategies based on current vessel state. When errors are within acceptable ranges, the system transitions to a lower-thrust or constant-thrust mode, thereby reducing fuel consumption while maintaining positioning accuracy when needed.
2Measurement precision
If constant adjustments in thrust are made to maintain vessel position and heading, then positioning accuracy is improved, but emissions increase
Solution Approach 1:
By implementing periodic rather than continuous thrust adjustments, the system reduces the frequency of fuel combustion events, directly lowering emissions. The vessel maintains positioning accuracy through strategic adjustments only when necessary, minimizing harmful emissions from thruster operations.
Solution Approach 2:
The system dynamically changes thrust parameters to optimize the balance between positioning accuracy and emissions. By transitioning to constant or reduced thrust modes when acceptable, the system minimizes fuel combustion and associated emissions while preserving positioning precision when required.
3Measurement precision
If constant adjustments in thrust are made to maintain vessel position and heading, then positioning accuracy is improved, but thruster activity increases
Solution Approach 1:
The system reduces thruster activity by implementing periodic adjustments based on error thresholds rather than continuous operation. Thrusters are activated only when position or heading deviations exceed predetermined limits, maintaining positioning accuracy while significantly reducing overall thruster runtime and activity levels.
Solution Approach 2:
The control system dynamically changes thrust parameters, switching between active adjustment modes and constant or idle modes based on vessel state. This parameter changes approach maintains positioning accuracy when needed while reducing thruster activity and wear during stable operating conditions.
Data Source
AI summary
Dynamic positioning systems and methods for controlling thrusters of a vessel. A dynamic positioning system includes a controller configured to predict position and heading of the vessel and efficiently control the the thrusters based on the predicted position and heading.