Water Jet Propulsion Boat Bow-Up Attitude Control
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Solution Overview
Problem
Conventional water jet propulsion boats face challenges in operability when transitioning to and maintaining a bow-up attitude, as the deflector's fixed position does not effectively manage the tilt angle of the hull.
Innovation Solution
A water jet propulsion boat equipped with a tilt detector, controller, and jet stream changer that calculates the angle difference between the current and target bow-up tilt angles, adjusting the jet stream direction or force to facilitate smooth transitions and maintenance of the bow-up attitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the deflector is placed in a fixed position when the hull is in the bow-up attitude, then the structure is simple, but the operability and smooth transition to bow-up attitude deteriorate
Solution Approach 1:
The patent applies the dynamics principle by making the deflector position adjustable rather than fixed. The controller dynamically changes the deflector position based on the detected tilt angle, enabling smooth transition to and maintenance of bow-up attitude. This resolves the contradiction by introducing dynamic adaptability that improves operability while maintaining reasonable structural complexity through automated control.
Solution Approach 2:
The patent implements feedback control by using a tilt detector to monitor the hull's tilt angle and feeding this information back to the controller, which then adjusts the deflector position accordingly. This closed-loop feedback system ensures the hull maintains the desired bow-up attitude smoothly, resolving the operability issue while managing system complexity through intelligent control rather than mechanical complexity.
2Device complexity
If the deflector position is not adjusted according to tilt angle, then the control system is simple, but the ability to maintain bow-up attitude deteriorates
Solution Approach 1:
The patent uses feedback control where the tilt detector continuously monitors the hull's tilt angle and the controller adjusts the deflector position based on the detected angle. This feedback mechanism provides automatic stabilization, maintaining bow-up attitude stability without requiring complex mechanical stabilization structures, thus resolving the contradiction between control system simplicity and attitude stability.
Solution Approach 2:
The system implements self-service stabilization by automatically detecting the tilt angle and adjusting the deflector position without external intervention. The controller autonomously maintains the desired bow-up attitude by comparing the detected angle with the target angle and making necessary adjustments, achieving stability while keeping the control system relatively simple through intelligent autonomous operation.
3Device complexity
If the jet stream direction is fixed, then the propulsion mechanism is simple, but the ability to achieve smooth transition to bow-up attitude deteriorates
Solution Approach 1:
The patent applies dynamics by making the jet stream direction adjustable through the deflector mechanism. The controller dynamically changes the jet stream direction based on the detected tilt angle, enabling smooth transition to bow-up attitude. This resolves the contradiction by introducing dynamic control that improves transition smoothness while managing mechanism complexity through automated adjustment rather than complex mechanical systems.
Solution Approach 2:
The patent implements parameter changes by varying the jet stream direction angle according to the detected tilt angle. The controller adjusts the deflector position to change the jet stream parameters (direction and force), enabling smooth transition to and maintenance of bow-up attitude. This resolves the contradiction by using parameter variation to improve transition quality while keeping the base propulsion mechanism relatively simple.
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
Enhances the operability of the hull by efficiently reducing the angle difference, allowing for improved control and stability in bow-up attitudes through dynamic adjustments of the jet stream.
Implementation Method 1
a jet propulsion mechanism to generate propulsive force of the hull by ejecting a jet of water with a driving force from a driving source
Implementation Method 2
a jet stream changer to change at least one of a jet stream direction or a jet stream force of the jet of water from the jet propulsion mechanism
Data Source
AI summary
A water jet propulsion boat includes a hull, a drive source in the hull, a jet propulsion mechanism to generate a propulsive force for the hull by ejecting a jet of water with a driving force from the driving source, a jet stream changer to change at least one of a jet stream direction and a jet stream force of the jet of water from the jet propulsion mechanism, a tilt detector to output a detection signal according to a tilt angle of the hull, and a controller configured or programmed to execute an angle difference calculation to calculate an angle difference between the tilt angle of the hull and a target angle of the hull for a bow-up attitude based on the detection signal from the tilt detector, and a feedback process to reduce the angle difference by changing at least one of the jet stream direction or the jet stream force by the jet stream changer.