Ship Maneuvering Control With Thrust Reduction for Tight Course Changes
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Solution Overview
Problem
Existing ship maneuvering systems fail to control both lateral and forward-backward movements simultaneously, leading to increased turning radii and potential overshooting during course changes.
Innovation Solution
A ship maneuvering device that integrates propulsion devices to control thrust based on azimuth deviation, reducing speed when necessary to minimize turning radius and enhance maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ship uses only rudder control for course changes, then the steering mechanism is simple, but the turning radius increases and course change precision deteriorates
Solution Approach 1:
The patent combines rudder control with thrust control into a unified maneuvering system. The control unit integrates both steering commands and thrust commands, coordinating the rudder angle and propulsion thrust simultaneously to achieve precise course changes with reduced turning radius.
Solution Approach 2:
The system dynamically adjusts thrust based on the ship's current speed and azimuth deviation. When azimuth deviation exceeds the threshold, the control unit generates thrust commands that reduce ship speed, which in turn reduces the turning radius and improves course change precision.
2Productivity
If the ship maintains high speed during course changes, then productivity is maintained, but the turning radius increases causing overshoot
Solution Approach 1:
The system dynamically adjusts thrust based on the ship's current speed and azimuth deviation. When azimuth deviation exceeds the threshold, the control unit generates thrust commands that reduce ship speed, which in turn reduces the turning radius and improves course change precision.
Solution Approach 2:
The control unit changes the thrust parameter based on azimuth deviation conditions. When the azimuth deviation is within the threshold, normal thrust is maintained for productivity. When the deviation exceeds the threshold, thrust is adjusted to reduce speed and minimize turning radius, preventing overshoot.
Data Source
AI summary
This ship maneuvering device causes a ship having at least one propulsion device mounted thereon to travel along a scheduled course. The ship maneuvering device is provided with a control unit. The control unit acquires an azimuth deviation between an actual bow azimuth, which is the current bow azimuth of the ship, and a target bow azimuth of the ship, and, on the basis of the azimuth deviation, generates a thrust command that indicates the thrust with which the ship is to be propelled. In the case where the azimuth deviation is equal to or greater than a prescribed value, the control unit generates a thrust command such that causes the speed of the ship is reduced below an actual speed which is the current speed of the ship.