Flight Actuator Check Device for Primary Load Path Failure Detection
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Solution Overview
Problem
Existing flight actuator primary load path failure detection systems rely on additional sensors or complex mechanisms, which can lead to potential catastrophic failures if the primary load path failure is not accurately detected, and there is a need for a method to test the detection system without adding new components or causing irreversible changes.
Innovation Solution
A primary load path failure detection system using a mechanical linkage that simulates disconnection of the position sensor by allowing relative movement between mechanical parts, utilizing existing sensors and mechanical elements, and incorporating a releasable element like a breakable pin to disconnect the position sensor from the primary load path upon failure, allowing for testing without additional sensors or extensive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional sensors or complex mechanisms are used to detect primary load path failure, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses the existing position sensor to detect both normal operation and failure conditions. The failure detection functionality is achieved by processing signals from the existing sensor through a evaluation unit that monitors for disconnection or abnormal readings, eliminating the need for separate failure detection sensors
Solution Approach 2:
The position sensor serves dual purposes: monitoring actuator position during normal operation and detecting primary load path failures. The evaluation unit processes the same sensor signals for both control and safety functions, making the system multi-functional without adding components
2Reliability
If testing methods are added to verify detection system operation, then reliability is improved, but device complexity increases
Solution Approach 1:
A test mode is provided that can be activated before flight to verify the failure detection system is functioning correctly. The test mode simulates failure conditions and verifies sensor disconnection functionality without requiring actual failure or additional testing hardware
Solution Approach 2:
The system includes self-verification capability through the evaluation unit that can detect both actual failures and test conditions using the same position sensor and signal processing path, allowing the system to verify its own functionality without external testing equipment
3Loss of information
If the position sensor remains connected during failure, then measurement continuity is maintained, but false readings occur
Solution Approach 1:
The evaluation unit continuously monitors the position sensor signals for indications of primary load path failure. When a failure is detected through abnormal sensor readings or disconnection, the system provides feedback to disconnect the sensor from the actuator, preventing further false readings while maintaining system awareness of the failure state
Solution Approach 2:
The connection state of the position sensor is dynamic rather than fixed. The sensor is connected during normal operation to provide continuous measurements, but can be automatically disconnected when failure conditions are detected, allowing the system to adapt its measurement configuration based on operational conditions
Data Source
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AI summary
A check device is provided for a flight actuator primary load path failure detection device 13 of the type that disconnects a position sensor 15 from the primary load path 1 in the event of a primary load path failure. The check device comprises: a mechanical linkage 40, 42, 44 for simulating disconnection of the position sensor 15 by permitting relative movement of at least first and second mechanical parts 32, 34 of the actuator that are unable to move relative to one another in normal use without failure of the primary load path 1, wherein these first and second mechanical parts 32, 34 include a first mechanical part 32 with movement detected by the position sensor 15 of the primary load path failure detection device 13.