Aircraft Brake Actuation Smoothing via Force Command Filtering
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Solution Overview
Problem
Aircraft brake control systems face errors due to the mismatch between desired and actual brake actuator positions, rates, and rate changes, leading to increased mechanical wear and frequent movements caused by quantization noise and high loads, which are not effectively addressed by existing technologies.
Innovation Solution
A control actuation smoothing system that includes a filter within an aircraft brake and steering controller, which receives target performance data and compares it to force commands to determine errors, then outputs a smoothed force command, approximating the physical capabilities of the brake actuator, thereby reducing wear and improving response accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the brake control system transmits output signals directing the brake actuator to follow a desired path of actuator travel, then the control precision is improved, but the mechanical components experience increased wear due to frequent movements and high loads
Solution Approach 1:
The filter is applied in advance to the force command signal to smooth it before it reaches the brake actuator. This preliminary filtering action removes quantization noise and prevents high-frequency commands that would cause excessive mechanical wear, while still maintaining the overall braking performance
Solution Approach 2:
A filter is introduced as an intermediary component between the control system and the brake actuator. This intermediary smooths the force command signal by removing high-frequency quantization noise, thereby protecting the mechanical components from excessive wear while preserving the essential control functionality
2Measurement precision
If the force command includes fine adjustments caused by quantization noise, then the control accuracy is improved, but the mechanical components move frequently increasing wear
Solution Approach 1:
The filter extracts and removes the harmful quantization noise component from the force command signal while preserving the essential braking control information. This separation allows the system to maintain control accuracy without transmitting the high-frequency noise that causes mechanical wear
Solution Approach 2:
The filter serves as an intermediary that selectively removes quantization noise from the force command signal before it reaches the brake actuator, thereby preventing frequent mechanical movements while preserving the necessary control accuracy for effective braking
3Speed
If the system outputs a force command that does not account for actuator physical capabilities, then the response speed is improved, but the control accuracy deteriorates due to error between desired and actual actuator behavior
Solution Approach 1:
The filter incorporates feedback about the actuator's physical capabilities and actual behavior into the control signal processing. By comparing the desired force command with the actuator's actual response characteristics, the filter adjusts the signal to compensate for mechanical limitations, thereby improving control accuracy while maintaining response speed
Data Source
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AI summary
The present disclosure relates to control actuation smoothing, and more particularly, to a control actuation smoothing system that smoothes brake actuation. The smoothing may be determined in response to a filter (207). In various embodiments, the smoothing may enhance brake component performance.