Angle-of-Attack Probe Self-Testing via Parasitic Torque Detection
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Solution Overview
Problem
Existing angle-of-attack probe systems lack a reliable method to verify their integrity in flight, relying on external data that can lead to false alarms and uncertainties, especially when one of the systems is faulty or imprecise.
Innovation Solution
A self-testing method for angle-of-attack probes that uses a rotary element to measure parasitic torque and compare it against predetermined thresholds, utilizing a processing module to diagnose faults without external data, combined with a method to check airflow velocity using multiple Pitot probes for consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external data from other sensors is used to verify angle-of-attack probe integrity, then verification capability is provided, but false alarms and uncertainties increase due to faulty or imprecise external systems
Solution Approach 1:
The angle-of-attack probe performs self-verification by monitoring its own operational parameters (power consumption, signal output, mechanical position) rather than relying on external sensor data. The processing module analyzes the probe's self-reported data to detect faults, eliminating the problem of false alarms from cross-system verification while maintaining reliability through internal consistency checks
2Reliability
If multiple sensor systems are merged to determine angle of attack likelihood, then verification capability is improved, but system complexity and sources of potential failure increase
Solution Approach 1:
The verification function is extracted from the complex multi-sensor merging approach and implemented as a dedicated self-monitoring subsystem within the angle-of-attack probe. The processing module separately analyzes power consumption, signal characteristics, and mechanical position data to independently verify probe integrity, reducing system complexity while maintaining verification capability
3Measurement precision
If static testing with electromagnetic damping is used, then positioning accuracy is improved, but in-flight integrity checking capability is lost
Solution Approach 1:
The self-verification system operates continuously during both ground testing and in-flight operations. The processing module continuously monitors power consumption, signal output, and mechanical position parameters, providing uninterrupted integrity verification across all operational phases rather than limiting verification to static ground testing only
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
Ensures reliable in-flight integrity verification of angle-of-attack probes and accurate airflow velocity measurement by identifying and isolating faults, enhancing safety and reducing false alarms in avionics systems.
Implementation Method 1
the axis of symmetry of the probe aligns itself in the relative wind axis... the return toward the equilibrium position is due to the equilibrium of the aerodynamic forces on either side of a rotary element
Implementation Method 2
A differential sensor measures the pressure deviation between these two openings
Data Source
AI summary
The present invention relates to a method for self-testing an angle-of-attack probe comprising the steps of controlling an angular excitation of a rotary element that is rotatable about its equilibrium position according to known excitation characteristics; acquiring angular measurements relating to the rotation of the rotary element, determining a parasitic torque applied to the rotary element on the basis of the angular measurements and of the excitation characteristics; comparing at least one component of the parasitic torque with at least one predetermined threshold and detecting an operating fault in the probe when said component exceeds the predetermined threshold.