Aircraft Air Filter Clogging Evaluation System
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Solution Overview
Problem
Current aircraft air filter clogging evaluation systems are unable to provide precise and reliable information on filter clogging levels, leading to potential engine power reduction and premature maintenance, which can limit flight performance and safety.
Innovation Solution
An evaluation system that measures differential pressure across the air filter, engine power usage, and aircraft speed to calculate a corrected clogging rate, using predetermined limits that vary with engine power and include external atmospheric parameter corrections, allowing for precise and reliable clogging level assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple differential pressure measurement system is used to evaluate air filter clogging, then the device complexity is reduced, but the measurement precision and reliability of clogging assessment deteriorates
Solution Approach 1:
The system changes multiple parameters simultaneously: differential pressure measurement, aircraft speed, engine power, and atmospheric conditions. By monitoring how differential pressure varies with these parameters and comparing against stored reference data, the system achieves precise clogging assessment without overly complex hardware. The computer processes these varying parameters to distinguish between pressure changes caused by filter clogging versus those caused by operational conditions.
2Ease of operation
If differential pressure threshold values are kept constant for clogging evaluation, then the ease of operation is improved, but the adaptability to different engine power levels and flight conditions deteriorates
Solution Approach 1:
The system makes the evaluation thresholds dynamic by storing multiple reference differential pressure values corresponding to different aircraft speeds and engine power levels. The computer automatically selects the appropriate reference value based on current flight conditions, allowing the clogging assessment to adapt to varying operational requirements without requiring manual intervention from the pilot.
Solution Approach 2:
The system changes the threshold parameters based on flight conditions. Instead of using a single fixed threshold, the computer compares the measured differential pressure against speed- and power-dependent reference values stored in memory. This allows the same physical filter condition to be correctly assessed across different flight regimes.
3Measurement precision
If aircraft speed correction is applied to differential pressure measurement, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system uses feedback from the aircraft's speed measurement system to correct the differential pressure reading. The computer receives speed data, automatically applies the appropriate correction based on stored correction factors or algorithms, and uses this corrected value for clogging assessment. This feedback mechanism improves precision without requiring complex manual correction procedures.
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
The system provides accurate and independent clogging rate information, reducing unnecessary performance limitations and ensuring safer flight operations by accurately assessing air filter condition.
Implementation Method 1
a first measurement device performing a differential pressure measurement Δpt between a reference pressure and a pressure measured downstream of the air filter in the air inlet
Data Source
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AI summary
The present invention relates to an evaluation system (2, 12, 22) for assessing the clogging level of an air filter (3), said air filter (3) being fitted to an aircraft (1) equipped with at least one engine (5), said air filter (3) being positioned at an air inlet (4), said evaluation system (2, 12, 22) for generating information relating to the clogging level of the air filter (3) and comprising: • a first measuring element performing a differential pressure measurement Δpt between a reference pressure and a pressure measured downstream of said air filter (3) in said air inlet (4), • a second measuring element for determining a value of the operating power P, Pcor of the engine(s) (5), • a third measuring element performing a speed measurement of said aircraft (1) relative to the surrounding air, and • at least one computer configured to generate said information based on said differential pressure measurement. Δpt,of said value of the operating power P, Pcor of said at least one motor (5), and of said speed, said first, second and third measuring devices being respectively connected to said at least one computer.