Aero-Engine Actuator Fault Control With Bumpless Virtual Actuation
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Solution Overview
Problem
Existing methods for reconfiguring controllers in aero-engine systems after actuator faults lead to undesired oscillations and safety hazards due to the lack of bumpless transfer design, which complicates the switching process and affects the system's transient characteristics.
Innovation Solution
A bumpless transfer active fault tolerant control method is developed, using an improved virtual actuator design with output-state feedback and performance optimization to ensure smooth transitions without altering the controller's structure or parameters, thereby reducing oscillations and improving system safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional virtual actuator reconfiguration control is used, then the controller can compensate for actuator faults and restore original control effect, but undesired oscillations and bumps occur during switching process
Solution Approach 1:
The patent designs a transition model that predicts future states of the system and pre-calculates the control input required for bumpless transfer. By performing preliminary calculations of the transition control input based on predicted future states, the system prepares the necessary compensation before actual switching occurs, eliminating bumps and oscillations during the transition process.
Solution Approach 2:
The patent introduces a transition model as an intermediary component between the fault detection module and the control execution module. This transition model acts as a mediator that processes the fault information and generates smooth transition control commands, avoiding direct switching that would cause oscillations while maintaining fault tolerance capability.
2Reliability
If reconfigured controller is switched into fault system, then fault compensation is achieved, but transient oscillations and safety hazards occur
Solution Approach 1:
The transition model performs preliminary calculations to determine the exact control input needed for smooth transition into the fault condition. By pre-computing the transition control command based on predicted future system states, the controller switches into the fault condition without causing transient oscillations, maintaining both fault compensation effectiveness and transient stability.
Solution Approach 2:
The patent employs a feedback mechanism where the transition model continuously monitors system state and adjusts the transition control input accordingly. This feedback ensures that the reconfigured controller switches into the fault system smoothly, maintaining stability while achieving effective fault compensation.
3Productivity
If optimal control parameters are calculated using matrix operations, then control performance is optimized, but computational complexity increases
Solution Approach 1:
The patent transforms the optimal control problem from solving complex matrix equations to calculating scalar parameters based on predicted future states. By changing the mathematical approach from matrix operations to parameter-based calculations, the system achieves optimal control performance with significantly reduced computational complexity, making it suitable for real-time implementation.
Data Source
AI summary
A bumpless transfer fault tolerant control method for aero-engine under actuator fault is disclosed. For an aero-engine actuator fault, by adopting an undesired oscillation problem produced by an active fault tolerant control method based on a virtual actuator, in order to solve the shortage of the existing control method, a bumpless transfer active fault tolerant control design method for the aero-engine actuator fault is provided, which can guarantee that a control system of the reconfigured aero-engine not only has the same state and output as an original fault-free system without changing the structure and parameters of a controller, to achieve a desired control objective, and that a reconfigured system has a smooth transient state, that is, output parameters such as rotational speed, temperature and pressure do not produce the undesired transient characteristics such as overshoot or oscillation.