Accumulator Piston Position Measuring Device
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Solution Overview
Problem
Existing hydraulic accumulator systems in aircraft landing gear braking systems lack a reliable means to continuously monitor and display the energy reserve, which is crucial for ensuring the pilot can take necessary measures in case of energy deficiencies.
Innovation Solution
A hydraulic accumulator with an electro-mechanical piston-position measuring system, utilizing a partition wall connected to a wire and a longitudinal variable differential transformer (LVDT) for precise measurement of fluid volume changes, allowing for continuous monitoring of the energy reserve through an electric sensor, enabling hermetic sealing and maintenance-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydraulic accumulator is used to store energy in aircraft braking systems, then the energy reserve can be maintained for long periods, but there is no reliable means to continuously monitor the energy reserve level
Solution Approach 1:
The patent replaces mechanical monitoring methods with an electro-mechanical measuring system. A piston position measuring device with electrical sensors and evaluation circuits continuously monitors the accumulator's energy reserve level, converting mechanical piston displacement into electrical signals that can be displayed and monitored, thereby solving the problem of unreliable manual or indirect monitoring methods.
Solution Approach 2:
The patent implements a feedback system where the piston position measuring device continuously provides information about the energy reserve level to the pilot through electrical signals and displays. This closed-loop feedback enables continuous monitoring and allows the pilot to take necessary measures when energy levels become insufficient, directly addressing the information loss problem.
2Measurement precision
If a piston position measuring device is added to the accumulator, then continuous monitoring of energy reserve is achieved, but the device complexity increases
Solution Approach 1:
The patent designs the piston position measuring device to serve multiple functions: it measures piston position, determines energy reserve level, provides continuous monitoring feedback, and interfaces with the aircraft's existing electrical systems. This multi-functionality justifies the added complexity by delivering comprehensive monitoring capabilities from a single integrated system.
Solution Approach 2:
The patent introduces an intermediary evaluation circuit that processes raw sensor signals and converts them into meaningful energy reserve level information. This intermediary component simplifies the overall system architecture by centralizing the measurement and evaluation functions, reducing the complexity of direct sensor-to-display connections.
3Duration of action of stationary object
If hermetic sealing is implemented for the measuring system, then maintenance-free operation is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs sealed magnetic coupling elements that are designed as maintenance-free, hermetically sealed components. While these sealed components require high manufacturing precision, their long operational life and elimination of maintenance needs justify the increased manufacturing complexity, especially compared to traditional mechanical seal arrangements that require periodic servicing.
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 provides a reliable and continuous monitoring of the energy reserve in the accumulator, ensuring the pilot can respond to energy deficiencies, enhancing the safety and efficiency of the braking system by accurately measuring the fluid volume under pressure.
Implementation Method 1
a longitudinal variable differential transformer (LVDT) for precise measurement of fluid volume changes
Data Source
AI summary
A hydraulic accumulator including a fluid chamber and a displaceable piston that is connected to a piston position-measuring means is disclosed. Embodiments of the hydraulic accumulator can provide a device that measures the available fluid volume in the accumulator. In embodiments, the displaceable part of the piston may separate fluid volume from gas volume, and may be connected to a wire that runs through the fluid volume and exits the outside of the accumulator through a sealed opening. Further, in embodiments, the wire may be led over pulleys and through a hollow member connected to the accumulator. The position of an associated metallic core member can be electrically monitored to provide position and fluid volume information.