Marine Vessel Drift Control Using Adjustable Hull Resistance
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Solution Overview
Problem
Conventional drift fishing methods using marine vessels face issues with fishing line entanglement due to differing movements of the hull and fishing line caused by tidal currents and wind, which are not effectively managed by manual resistance members.
Innovation Solution
A control device for a marine vessel featuring independently movable resistance members on the hull, controlled by a system that acquires wind and tidal current data to adjust resistance levels, ensuring the hull moves in sync with the fishing line, using propulsion devices like outboard and trolling motors for additional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a manual resistance member (sea anchor) is used to increase water resistance, then the hull is more strongly affected by tidal current, but it becomes difficult to maneuver the hull to move in line with the fishing line
Solution Approach 1:
The resistance member is divided into multiple segments (first resistance member and second resistance member) that can be independently controlled. This segmentation allows differential resistance application on left and right sides of the hull, enabling precise maneuvering while maintaining overall water resistance for tidal current alignment.
Solution Approach 2:
The resistance members are made dynamically adjustable through automated control based on sensor inputs (wind direction, wind speed, current direction). The system continuously modifies resistance levels to optimize both the force applied to align with tidal currents and the ease of maneuvering the hull with the fishing line.
2Ease of operation
If the hull drifts freely with tidal current, then drift fishing is simplified, but wind effects cause differential movement between hull and fishing line leading to entanglement
Solution Approach 1:
The system incorporates sensors that continuously monitor wind direction, wind speed, and current direction, feeding this information back to the control unit. This feedback loop enables real-time adjustments to resistance member positions, compensating for wind effects and preventing hull-fishing line misalignment that causes entanglement.
Solution Approach 2:
The resistance members act as intermediaries between the wind/current environment and the hull. By strategically positioning and adjusting these members, the system mediates environmental forces to maintain hull alignment with the fishing line while preserving the drift fishing mode.
3Stability of the object's composition
If resistance members are positioned to maximize tidal current effect, then hull alignment with current improves, but control over hull position relative to fishing line decreases
Solution Approach 1:
By segmenting the resistance system into independently controllable units positioned at different locations on the hull, the system can selectively apply resistance to maintain current alignment while using differential control to adjust hull position relative to the fishing line.
Solution Approach 2:
The system dynamically changes parameters (resistance member position, resistance level) based on sensor feedback to simultaneously achieve hull alignment with tidal currents and proper positioning relative to the fishing line, resolving the apparent contradiction between stability and controllability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a comfortable drift fishing environment by minimizing differential movement between the hull and fishing line, maintaining alignment with tidal currents even under varying wind conditions.
Implementation Method 1
resistance members... each independently drivable and movable between a first position, where the resistance received from water in a predetermined direction is adjusted to a first magnitude, and a second position, where the resistance is adjusted to zero or to a second magnitude smaller than the first magnitude
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3
AI summary
A control device for a marine vessel (1) includes a hull (2), at least a pair of resistance members (93), a first acquisition unit (71), a second acquisition unit (71), and a control unit (71). The resistance members (93) are arranged on the hull (2), one on the left and one on the right, each independently drivable and movable between a first position, where the resistance received from water in a predetermined direction is adjusted to a first magnitude, and a second position, where the resistance is adjusted to zero or to a second magnitude smaller than the first magnitude. The first acquisition unit (71) acquires wind speed (WS). The second acquisition unit (71) acquires tidal current speed (TV1). The control unit (71) controls the resistance members (93) based on the wind speed (WS) and the tidal current speed (TV1).