Adaptive Damping Filter for Turbine Engine Actuator Wear Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gas turbine engines face challenges in designing actuating components that can adapt to changing operating conditions, leading to excessive wear and shortened service lives due to undesirable actuator motion caused by small changes in scheduling inputs to Variable Bleed Valves (VBV) control logic.
Innovation Solution
The implementation of an adaptive damping lag filter that determines a gain based on the rate of change of the demanded position input and a delta between current and prior position demands, filtering out insignificant changes and adapting to follow demanded positions closely, thereby optimizing actuator control and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If small changes to scheduling inputs (e.g., fan speed) are applied to VBV control logic, then adaptability to changing operating conditions is improved, but excessive actuator motion occurs causing increased wear and shortened service lives
Solution Approach 1:
The patent implements a dynamic gain filter that adapts its filtering characteristics based on operating conditions. The gain value changes dynamically according to the rate of change of demanded position, allowing the system to be more responsive when large changes are needed while filtering out small insignificant changes during steady-state operation. This dynamic adaptation resolves the contradiction by making the actuator both adaptable to genuine operating condition changes and resistant to wear from spurious small changes.
Solution Approach 2:
The patent changes the parameter of filter gain based on the rate of change of demanded position input. When the rate of change is high, the gain is reduced to allow faster response; when the rate of change is low, the gain is increased to filter out small insignificant changes. This parameter adjustment strategy allows the system to maintain adaptability while reducing excessive actuator motion and wear.
2Reliability
If filtering is applied to demanded position input, then actuator wear is reduced, but response to genuine operating condition changes may be delayed
Solution Approach 1:
The dynamic gain filter adjusts its filtering strength based on the rate of change of demanded position. When rapid changes occur indicating genuine operating condition changes, the gain is reduced to minimize filtering and maximize response speed. During steady-state operation with slow changes, the gain is increased to provide strong filtering and reduce actuator wear. This dynamic adjustment resolves the speed-reliability contradiction.
Solution Approach 2:
The filter gain parameter is changed based on the derivative of demanded position input. By monitoring the rate of change and adjusting the gain accordingly, the system achieves fast response when needed while providing wear protection during normal operation. The parameter change strategy ensures that filtering intensity is matched to the actual operational requirements.
Data Source
AI summary
Methods for controlling actuating components of turbine engines using an adaptive damping lag filter are provided. The adaptive filter includes features that filter out insignificant changes in actuator demand, respond to fast transient conditions to follow demanded position of the actuating component more closely, and adapts the gain of the output position to avoid stall conditions.