Actuator Lifetime Estimation via Control Command Analysis
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Solution Overview
Problem
Current methods for determining the repair timing of aircraft actuators lack precision, leading to potential failures before scheduled maintenance and unnecessary replacements, as operation records vary significantly between aircraft.
Innovation Solution
An actuator monitoring system that calculates the use time and torque of an electric actuator based on control commands and feedback signals, allowing for precise estimation of its lifetime and issuing warnings when the estimated lifetime is reached before the scheduled repair time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repair timing is determined based on past repair records, then maintenance can be scheduled in advance, but the estimation precision of actuator lifetime is insufficient
Solution Approach 1:
The system implements feedback by continuously monitoring operation records (on/off timing, operation time, load conditions) and using this information to dynamically update and refine lifetime estimation. The control unit accumulates operation history and feeds it back into the estimation algorithm, allowing the system to adapt to actual usage patterns and improve precision over time.
Solution Approach 2:
The actuator monitoring system performs self-diagnosis and self-monitoring by automatically tracking its own operation records without external intervention. The control unit independently calculates usage metrics and estimates lifetime based on accumulated data, enabling the system to serve its own maintenance needs without requiring complex external monitoring infrastructure.
2Reliability
If actuator is replaced based on fixed repair timing, then maintenance scheduling is simplified, but premature replacement or failure before maintenance occurs
Solution Approach 1:
The system transitions from static fixed-schedule maintenance to dynamic condition-based maintenance. The control unit continuously updates lifetime estimation based on real-time operation records, allowing maintenance timing to adapt dynamically to actual actuator usage patterns and conditions, thereby optimizing reliability and preventing both premature replacement and unexpected failures.
Solution Approach 2:
The system performs preliminary assessment by continuously monitoring operation records and estimating remaining lifetime before actual failure occurs. This allows maintenance to be scheduled proactively based on predicted lifetime rather than reactively after failure or rigidly according to fixed schedules, improving both reliability and timing accuracy.
Data Source
AI summary
An actuator monitoring system is provided with an electric actuator having a motor and a control unit which outputs a control command (CMD) to the motor to control the operation of the motor. The control unit calculates a use time of the electric actuator based on the control command (CMD) outputted to the motor. Moreover, the control unit estimates the lifetime of the electric actuator based on the calculated use time.