Trim Tab Timing Control for Marine Hull Hump State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional planing boats experience decreased fuel efficiency due to the hump state, where resistance increases, and the existing posture control systems lower the posture control plates too late, allowing the hump state to persist longer than necessary.
Innovation Solution
A posture control system that determines the timing of lowering the posture control plates based on the throttle opening angle, allowing the plates to be lowered before the hull reaches the predetermined speed, thereby preventing the hump state from lasting longer than expected and improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the posture control plates are lowered when the engine reaches the rpm corresponding to the hump state speed, then the control timing is simple, but the hump state lasts longer than expected and fuel efficiency decreases
Solution Approach 1:
The controller determines the timing for lowering the posture control plates based on the throttle opening angle before the engine reaches the rpm corresponding to hump state speed. This preliminary action allows the posture control plates to be lowered in advance, preventing the hump state from occurring rather than reacting after it begins, thereby improving fuel efficiency without significantly complicating the control system.
2Loss of energy
If the posture control plates are lowered earlier based on throttle opening angle, then fuel efficiency is improved, but the control system complexity increases
Solution Approach 1:
The controller uses feedback from the throttle opening angle sensor to determine the optimal timing for lowering the posture control plates. This feedback mechanism allows the system to adapt to different operating conditions and throttle positions, enabling precise control timing that improves fuel efficiency while maintaining a relatively simple control architecture by utilizing existing sensor data.
3Duration of action of moving object
If the posture control plates take time to lower, then the mechanical response time is fixed, but the hump state duration is extended
Solution Approach 1:
The system compensates for the fixed mechanical response time of the posture control plates by initiating the lowering action earlier, based on the throttle opening angle. This preliminary timing ensures that the plates complete their lowering motion just as the hull reaches the critical speed for hump state, thereby minimizing the duration of the hump state and improving fuel efficiency despite the fixed mechanical response time.
Data Source
AI summary
A posture control system for a hull includes trim tab main bodies as posture control plates attached to a stern of the hull to control the posture of the hull. Trim tab actuators drive the trim tab main bodies. Engines generate a propulsive force on the hull. A controller controls the trim tab actuators. Based on a throttle opening angle of the engines, the controller determines a time when the trim tab main bodies are to be lowered by the trim tab actuators.