Jet Propulsion Ship Fixed Point Holding Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing jet propulsion ships face challenges in maintaining a fixed position in environments with disturbances such as wind and tidal currents, as they rely on simple bucket positioning and lack effective control mechanisms for precise ship fixed point holding.
Innovation Solution
A ship equipped with a jet propulsion system that includes a nozzle, a bucket capable of changing the direction of the jet stream, and a controller that performs feedback control based on position deviations, allowing for precise control of the bucket's position and engine speed to maintain a fixed point, using intermediate positions between forward, neutral, and reverse positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bucket is disposed at a neutral position in a jet propulsion ship, then the ship can be held at a fixed position according to prior art, but it is not possible to hold the ship at a fixed position accurately in environments with disturbances such as wind and tidal currents
Solution Approach 1:
The patent applies dynamics by making the bucket position adjustable between fixed positions (forward, neutral, reverse) and continuous intermediate positions. The control unit dynamically adjusts the bucket position based on feedback from the position detection unit, allowing the system to adapt to environmental disturbances. This transforms a static positioning system into a dynamic one that can respond to changing conditions, thereby improving both accuracy and reliability in disturbed environments.
Solution Approach 2:
The patent implements feedback control by using a position detection unit to continuously monitor the ship's position and feeding this information back to the control unit. The control unit compares the detected position with the target position and adjusts the bucket position and engine output accordingly. This closed-loop feedback mechanism enables accurate fixed point holding even when subjected to environmental disturbances, directly addressing the technical contradiction.
2Ease of operation
If simple bucket positioning is used without control mechanisms, then the device complexity is low, but the controllability of ship fixed point holding is insufficient
Solution Approach 1:
The control unit serves multiple functions: it controls the bucket position, manages engine output, processes position data from the detection unit, and implements the feedback algorithm. By consolidating these functions into a single control unit, the system achieves high controllability without proportionally increasing complexity. The control unit acts as a multi-functional component that coordinates all aspects of fixed point holding.
Solution Approach 2:
The system implements self-service through automatic feedback control. The position detection unit continuously monitors the ship's position, and the control unit automatically adjusts the bucket and engine settings without requiring manual intervention. This self-regulating mechanism improves controllability while keeping the operation simple, as the system manages its own positioning automatically.
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 significantly improves the controllability of ship fixed point holding, enabling accurate positioning even in disturbed environments by utilizing intermediate bucket positions and adjustable engine speed for precise propulsive force management.
Implementation Method 1
a jet propulsion device that generates a propulsion force of the ship using the driving force output from the engine
Implementation Method 2
a jet propulsion ship that moves forward by ejecting a jet backward from a jet propulsion mechanism
Implementation Method 3
a bucket that changes a direction of the jet stream ejected from the nozzle
Data Source
AI summary
A ship including an engine, a jet propulsion device, a ship controller, and a ship position detection unit, in which the jet propulsion device includes a nozzle that ejects a jet stream generated by the driving force output from the engine, and a bucket that changes a direction of the jet stream, the position of the bucket includes at least a forward-side intermediate position between the forward position and the neutral position, the ship controller has a ship fixed point holding mode in which feedback control of the engine and the jet propulsion device is performed based on a deviation between a preset target ship position and the actual ship position, and both control of the position of the bucket including the forward-side intermediate position and control of a rotational speed of the engine are performed in the ship fixed point holding mode.