Marine Propulsion Angle and Lift Control for Roll Suppression
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Solution Overview
Problem
Existing marine vessels face challenges in suppressing displacement in the roll direction during navigation, particularly with increasing vessel size and speed, and existing techniques primarily rely on engine output control, lacking comprehensive solutions.
Innovation Solution
A marine vessel equipped with left and right propulsion devices, drive units, lift mechanisms, and a control system that adjusts the rotation angle and vertical position of these devices to counteract roll displacement through a combination of angle and position changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If engine output control is used to suppress roll displacement, then the control system is simple, but the suppression effectiveness is insufficient
Solution Approach 1:
The patent divides the single control function into two independent control systems: one for adjusting the rotation angle of propulsion devices and another for adjusting their vertical positions. This segmentation allows each control system to specialize in a specific aspect of roll suppression, improving overall effectiveness while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities by enabling real-time modification of both rotation angles and vertical positions of propulsion devices. This dynamic control allows the system to adapt to changing roll conditions during navigation, significantly enhancing suppression effectiveness compared to static engine output control alone.
2Ease of operation
If only engine output control is implemented, then the system is easy to operate, but the ability to suppress roll displacement is limited
Solution Approach 1:
The patent implements automatic control systems that independently manage rotation angle and vertical position adjustments based on detected roll conditions. This self-service capability eliminates the need for manual intervention while achieving superior roll suppression, maintaining ease of operation through automation rather than complicating manual controls.
Solution Approach 2:
The system incorporates feedback mechanisms that continuously monitor roll displacement and automatically adjust propulsion device parameters accordingly. This closed-loop control ensures effective roll suppression while maintaining simple operation, as the system self-regulates based on real-time conditions without requiring complex manual input.
3Reliability
If multiple control mechanisms (rotation angle and vertical position) are used, then roll suppression effectiveness improves, but device complexity increases
Solution Approach 1:
The patent divides the single control function into two independent control systems: one for adjusting the rotation angle of propulsion devices and another for adjusting their vertical positions. This segmentation allows each control system to specialize in a specific aspect of roll suppression, improving overall effectiveness while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent makes the propulsion devices serve multiple functions: they provide propulsion while also acting as active control elements for roll suppression through adjustable rotation angles and vertical positions. This multi-functionality reduces the need for separate stabilization devices, thereby limiting the increase in overall device complexity despite enhanced control capabilities.
Data Source
AI summary
A marine vessel includes a hull, left and right propulsion devices attached to a stern of the hull, left and right drive units to change a rotation angle of the left and right propulsion devices about left and right tilt shafts, and to set an angle at which a position of a lower portion of the left and right propulsion devices becomes highest as a maximum rotation angle, left and right lift mechanisms to change a vertical position of the left and right propulsion devices with respect to the hull, and a controller configured or programmed to function as a judging unit to judge whether or not a displacement in a roll direction of the hull has occurred, and a control unit to control the left and right drive units and the left and right lift mechanisms.