Aircraft Fuel Distribution System for Longitudinal Center of Gravity Control
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Solution Overview
Problem
Aircraft operators face challenges in managing the dynamic longitudinal center of gravity during long-range flights, leading to increased fuel consumption due to imprecise and manual fuel transfers between fuel tanks, which results in inefficient drag reduction and potential operational instabilities.
Innovation Solution
An automated fuel distribution system that includes a tail fin fuel tank and pump, connected to a controller, which transfers fuel along the aircraft's longitudinal axis at a predetermined rate to maintain a selected center of gravity position, using sensors and flight data to anticipate fuel consumption and adjust fuel transfers between the tail fin tank, center main tank, and tail plane tanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If manual fuel transfers are used to manage center of gravity, then operational flexibility is maintained, but fuel consumption increases due to imprecise and stepwise CG control
Solution Approach 1:
The system uses automatic fuel transfer pumps controlled by a computer to self-regulate fuel distribution between tanks, eliminating the need for manual crew intervention and achieving precise continuous CG control without human operation
Solution Approach 2:
The system continuously monitors fuel quantity in each tank and automatically adjusts pump operation to maintain optimal center of gravity position throughout the flight, creating a closed-loop control system that adapts to changing fuel consumption patterns
2Measurement precision
If stepwise fuel transfers are performed manually, then operational simplicity is maintained, but center of gravity control precision deteriorates
Solution Approach 1:
The system replaces manual mechanical fuel transfer operations with an automated computer-controlled pump system that continuously monitors and adjusts fuel distribution, achieving precise CG control through electronic control rather than manual intervention
Solution Approach 2:
The system maintains continuous fuel transfer operation rather than discrete stepwise transfers, with the pump operating continuously or intermittently as needed to maintain optimal CG position throughout the entire flight duration
3Stability of the object's composition
If fuel is transferred to maintain lateral trim, then flight stability is improved, but longitudinal center of gravity control becomes less precise
Solution Approach 1:
The system independently controls fuel transfer to different tank groups (center tank vs. wing tanks) through separate pump control, allowing lateral trim and longitudinal CG control to be optimized simultaneously without interfering with each other
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 system provides precise and continuous control of the aircraft's center of gravity, reducing fuel consumption by maintaining optimal longitudinal position and preventing operational instabilities, while being lightweight and cost-effective, and not interfering with existing ground-based fuel operations.
Implementation Method 1
a tail fin fuel pump to pump fuel between the tail fin fuel tank and the center main fuel tank
Data Source
AI summary
A method of aircraft fuel distribution includes selecting a longitudinal center of gravity and predicting a rate of change of the center of gravity during flight. Fuel is located in a tail fin tank of a vertical tail fin of the aircraft, and is transferred from the tail fin tank forward at a predetermined transfer rate to counteract the predicted rate of change thereby maintaining the selected center of gravity. An aircraft fuel distribution system includes a center main fuel tank, a tail fin tank and a tail fin fuel pump to pump fuel between the tail fin tank and the center main fuel tank. An electronic controller operates the tail fin fuel pump such that fuel is flowed between the tail fin tank and the center main fuel tank at a predetermined transfer rate to maintain automatically an optimal position of a longitudinal center of gravity of the aircraft.