Hull Posture Control via Torque-Based Tab Actuation
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Solution Overview
Problem
Conventional hull posture control systems for planing boats require detecting the roll angle of the hull before compensation, leading to initial hull rolling and an uncomfortable ride for crew, especially at low speeds where lift generation is insufficient to counteract propeller torque-induced rolling.
Innovation Solution
A hull posture control system that uses a controller to actuate posture control tabs based on engine torque and propeller torque, eliminating the need for roll angle detection and enabling immediate compensation for hull roll, thereby providing a more comfortable ride by proportionally adjusting the trim tab lowering angle in response to engine torque and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If roll angle detection is used to control posture tabs, then posture control is achieved, but initial hull rolling occurs before compensation
Solution Approach 1:
The patent applies preliminary action by controlling the posture tabs based on engine torque before the hull actually rolls. The controller receives engine torque information and actuates the posture tabs in advance to generate counteracting moments, preventing roll occurrence rather than responding after detection. This eliminates the harmful initial rolling that occurs in conventional detection-based systems.
Solution Approach 2:
The patent uses engine torque as an intermediary parameter to bridge the control system and hull posture. Instead of directly detecting roll angle, the system uses engine torque information as a mediator to predict and compensate for rolling tendencies. This intermediary approach allows the controller to act proactively based on propulsion system state rather than reactive hull motion.
2Stability of the object's composition
If posture control tabs are lowered to generate lift, then hull roll is compensated, but device complexity increases
Solution Approach 1:
The patent makes the posture control tabs multi-functional by using them for both roll compensation and trim control. The same tabs that generate roll-compensating moments also provide trim adjustment capabilities. This universality reduces overall system complexity by consolidating functions into existing components rather than adding separate systems for each function.
Solution Approach 2:
The patent merges the roll control and trim control functions into a single integrated system. The controller receives engine torque information and simultaneously manages both roll compensation and trim adjustment through coordinated tab actuation. This merging of functions reduces the number of separate control systems needed and simplifies the overall device architecture.
3Stability of the object's composition
If stern flaps are actuated after roll detection, then roll compensation is achieved, but response time is delayed
Solution Approach 1:
The patent implements preliminary action by actuating the posture tabs before the hull roll occurs. The controller receives engine torque information and immediately actuates the tabs to generate counteracting moments, rather than waiting for roll detection. This proactive approach eliminates the time delay inherent in detection-then-action sequences and provides immediate roll compensation.
Solution Approach 2:
The patent uses engine torque as a feedback parameter to drive posture control. The controller continuously receives engine torque information and adjusts tab actuation accordingly. This feedback mechanism enables real-time adaptation to changing propulsion conditions, ensuring timely roll compensation without the delays associated with mechanical roll detection systems.
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
This solution allows for immediate compensation of hull roll without initial rolling, enhancing ride comfort by using engine and propeller torque to control the posture control tabs, effectively mitigating the impact of propeller torque at low speeds.
Implementation Method 1
A hull of a planing boat rolls when being subjected to a reaction force (moment) against torque produced by a propeller
Implementation Method 2
the moment generated by the propeller cannot be satisfactorily cancelled out by the lift, causing the hull to roll
Data Source
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AI summary
A posture control system for a hull (13) offers a more comfortable ride to crew on a marine vessel (11). A posture control tab (21) is mounted on a stem of the hull and controls the posture of the hull. An actuator (22A, 22B) actuates the posture control tab. At least one propeller (43) generates a propulsive force for the hull. An engine turns the propeller. A controller controls (30) the actuator according to at least one of engine torque generated by the engine and propeller torque generated by the propeller.