Jet Propulsion Bucket Thrust Control
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Solution Overview
Problem
Existing methods for reducing the speed of a jet propelled watercraft struggle to achieve both prompt speed reduction and stabilized behavior, as setting the predetermined speed too high results in unstable behavior with large thrust, while setting it too low leads to insufficient thrust for prompt speed reduction.
Innovation Solution
A jet propelled watercraft equipped with a controller that adjusts the thrust increase rate based on the vessel's forward speed by moving a bucket from a retracted position to a jet receiving position, allowing for a gradual increase in thrust to a predetermined value, thereby enabling both prompt speed reduction and stabilized behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the predetermined speed is set to be somewhat high, then the speed reduction is prompt, but the behavior of the vessel body becomes unstable
Solution Approach 1:
The patent applies dynamics by making the thrust control adaptive to changing vessel speed. The controller dynamically adjusts the thrust increase rate based on real-time forward speed feedback, transitioning from a static predetermined speed threshold to a dynamic control strategy that adapts to the vessel's actual motion state, thereby resolving the contradiction between prompt speed reduction and stability.
Solution Approach 2:
The patent changes the parameter of thrust increase rate based on forward speed. Instead of using a fixed predetermined speed threshold, the system continuously adjusts the thrust increase rate according to the actual forward speed, transforming the control parameter from a static value to a dynamic variable that optimizes both speed reduction promptness and vessel stability.
2Stability of the object's composition
If the predetermined speed is set to be somewhat low, then the behavior of the vessel body is stable, but the speed reduction is not prompt
Solution Approach 1:
The system transitions from a static low predetermined speed threshold to a dynamic control approach where the thrust increase rate continuously adapts to the vessel's forward speed. This dynamic adjustment enables the system to maintain stability at low speeds while achieving prompt speed reduction when needed, by optimizing the thrust increase rate in real-time.
Solution Approach 2:
The patent changes the thrust increase rate parameter based on actual forward speed conditions. When forward speed is high, the system allows for faster thrust increase to achieve prompt speed reduction; when forward speed is low, the system reduces the thrust increase rate to maintain stability, thus dynamically optimizing the parameter to resolve the contradiction.
3Device complexity
If thrust is set in accordance with the forward speed at the start of reducing the speed, then the control is simple, but it is difficult to simultaneously implement prompt speed reduction and stabilized behavior
Solution Approach 1:
The patent introduces feedback control by continuously monitoring the vessel's forward speed and using this information to adjust the thrust increase rate. The controller receives feedback on the actual motion state and dynamically adjusts the thrust control accordingly, enabling simultaneous achievement of prompt speed reduction and stabilized behavior through closed-loop control.
Solution Approach 2:
The system transforms the simple static thrust control into a dynamic adaptive control system. The thrust increase rate is no longer fixed but dynamically adjusts based on real-time forward speed feedback, enabling the system to optimize performance for both prompt speed reduction and stability without significantly increasing overall system complexity.
4Device complexity
If thrust is set in accordance with the forward speed at the start of reducing the speed, then the control is simple, but prompt speed reduction cannot be achieved
Solution Approach 1:
The patent applies feedback control to achieve prompt speed reduction while maintaining acceptable control complexity. The controller continuously monitors forward speed and adjusts the thrust increase rate in real-time, enabling the system to respond dynamically to speed reduction requirements and achieve prompt deceleration without overly complicating the control system.
Solution Approach 2:
The system dynamically changes the thrust increase rate parameter based on forward speed conditions to achieve prompt speed reduction. By adjusting this parameter in real-time according to actual speed conditions, the system can optimize the thrust application to achieve rapid deceleration without requiring a fundamentally more complex control architecture.
Data Source
AI summary
A jet propelled watercraft includes a vessel body, a jet propulsion mechanism, a bucket, and a controller. The jet propulsion mechanism is configured to propel the vessel body. The controller is configured and programmed to control a thrust of the jet propulsion mechanism to propel the vessel body. The bucket is configured to move to a retracted position spaced away from the jet of water ejected from the jet propulsion mechanism and a jet receiving position to receive the jet of water ejected from the jet propulsion mechanism. The controller is configured and programmed to change an increase rate of the thrust in accordance with a forward speed of the vessel body until the thrust is increased to a predetermined value after the bucket has been moved from the retracted position to the jet receiving position.