Refuelling Flow Control Using Electrostatic Tank Feedback
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Solution Overview
Problem
Current refuelling systems impose a maximum flow rate based on pessimistic safety assumptions, leading to longer refuelling times and potential over-restriction of fuel flow, which is not necessary when antistatic additives or safer conditions are present, thereby increasing operational and economic impacts.
Innovation Solution
A refuelling system with a variable-position valve controlled by a sensor arrangement and controller that adjusts fuel flow based on real-time electrostatic conditions and fuel tank levels, allowing for dynamic adjustment of flow rates to maintain safety while minimizing refuelling time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a maximum flow rate is imposed to mitigate electrostatic charge build-up, then safety is improved, but refuelling time increases
Solution Approach 1:
The patent applies dynamics by transitioning from a static maximum flow rate restriction to a dynamic flow control system. A variable-position valve is controlled by a controller that receives real-time electrostatic condition measurements from sensor arrangements, allowing the flow rate to be dynamically adjusted based on actual conditions rather than being constrained by worst-case assumptions throughout the entire refuelling operation.
Solution Approach 2:
The patent implements feedback by using sensor arrangements to continuously measure electrostatic conditions in the fuel tank and feeding this information back to a controller. The controller then adjusts the variable-position valve to maintain safe electrostatic levels while optimizing refuelling speed, creating a closed-loop control system that adapts to actual conditions.
2Reliability
If a maximum flow rate is imposed based on worst-case assumptions, then safety is improved, but productivity decreases
Solution Approach 1:
The system dynamically adjusts flow rate based on actual electrostatic conditions rather than maintaining a static maximum restriction. This allows the refuelling operation to proceed at higher productivity levels when conditions permit, while still ensuring safety when electrostatic build-up occurs.
Solution Approach 2:
The patent changes the flow rate parameter dynamically based on measured electrostatic conditions. Instead of maintaining a constant conservative flow rate, the system adjusts this parameter in real-time, allowing higher flow rates when electrostatic threats are low and reducing flow rates when threats are detected, thereby optimizing productivity while maintaining safety.
3Reliability
If a maximum flow rate is imposed to prevent over-pressurisation, then safety is improved, but refuelling time increases
Solution Approach 1:
The controller receives feedback not only from electrostatic sensors but also from fuel level measurements. This allows the system to adjust the variable-position valve based on both electrostatic conditions and tank fill level, enabling higher flow rates when the tank is not near capacity and reducing flow rates only when necessary to prevent over-pressurisation.
Solution Approach 2:
The system dynamically adjusts flow rate based on real-time fuel level measurements and electrostatic conditions. This allows the refuelling operation to proceed at optimal speeds for most of the process, with automatic reduction in flow rate only when the tank approaches capacity or electrostatic threats are detected, minimizing time loss while maintaining safety.
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 approach reduces refuelling time by dynamically adjusting fuel flow according to actual electrostatic threats and tank conditions, avoiding unnecessary restrictions and optimizing the refuelling process.
Implementation Method 1
a build-up of electrostatic charge can arise which can pose a threat to the safety of the aircraft and persons in the vicinity
Implementation Method 2
a variable-position valve for controlling a rate of flow of fuel leaving the conduit
Data Source
AI summary
A refuelling system is disclosed having a fuel conduit, a variable-position valve for controlling a rate of flow of fuel leaving the conduit, and a controller. The controller is configured to receive from a sensor arrangement a measurement of an electrostatic condition in a fuel tank being fuelled by the system. The controller is configured to control the variable-position valve to control the rate of flow of fuel based at least in part on the measurement received from the sensor arrangement.