Multi-Actuator Flight Control for Thermal Load Redistribution
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Solution Overview
Problem
Existing actuator systems in multiactuator aerial vehicles (MAVs) do not consider the health status and physical capacity of individual actuators, leading to potential degradation and overload due to uneven power distribution, which can cause cascading failures.
Innovation Solution
A method for controlling an actuator system that allocates tasks based on the available physical capacity of each actuator, adjusting weight matrices and control limits dynamically to prevent overheating and overload by using counters and weighting functions to redistribute power among actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If actuators are operated at maximum power continuously to maintain flight performance, then thrust output is maximized, but actuator temperature increases leading to overheating and potential failure
Solution Approach 1:
The patent implements dynamic adjustment of actuator control limits based on real-time temperature monitoring. The control system continuously adapts the maximum allowable control input for each actuator according to its current thermal state, transitioning from static maximum power operation to dynamic power management that prevents overheating while maintaining optimal performance when conditions permit
Solution Approach 2:
The system employs feedback mechanisms where temperature sensors monitor actuator thermal states and feed this information back to the control system. This feedback loop enables the controller to adjust control inputs in real-time, reducing power to overheating actuators and redistributing load to cooler actuators, thereby preventing thermal runaway while maintaining overall system performance
2Reliability
If control limits are reduced to prevent actuator failure, then actuator reliability improves, but overall system thrust capability decreases
Solution Approach 1:
The patent dynamically changes the control limit parameter for each actuator based on its individual health status and thermal state. Rather than applying a uniform reduction to all actuators, the system adjusts each actuator's control limit independently according to its current conditions, allowing healthy actuators to operate at or near maximum capacity while protecting compromised actuators, thereby maintaining overall system thrust capability while improving reliability
Solution Approach 2:
The system applies different control strategies to different actuators based on their individual states. Each actuator receives customized control limits and protection thresholds tailored to its specific health status, temperature, and operational history. This localized approach ensures that reliable actuators are fully utilized while problematic actuators receive appropriate protection, optimizing the balance between system-level performance and individual component reliability
3Device complexity
If uniform control limits are applied to all actuators for simplicity, then control system complexity is reduced, but uneven power distribution causes some actuators to overload while others underperform
Solution Approach 1:
The patent segments the control system into actuator-specific control channels, where each actuator has its own dedicated control limit and health monitoring parameters. This segmentation allows independent optimization of each actuator's operation based on its individual characteristics and state, preventing the uneven power distribution that would result from uniform control limits while maintaining manageable system complexity through modular architecture
Data Source
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AI summary
We propose a method of controlling an actuator system comprising a plurality of k actuators (3), preferably for controlling a multiactuator aerial vehicle (1), wherein said actuators (3) are preferably devised as individual propulsion units of the multiactuator aerial vehicle (1), wherein each of said actuators (3), during operation, receives a control input ui, wherein index i denotes a particular actuator (3), which control input ui is determined depending on a weight matrix W comprising a weighting factor wi for each actuator (3) and depending on at least a physical maximum control limit uimax for each of the actuators (3), wherein said weighting factors wi and/or physical maximum control limit uimax are actively changed during operation of the actuator system if a first comparison, for at least some of the actuators (3), of said control input ui or a function f(ui) thereof with a set first threshold value yields that said control input ui or said function f(ui) thereof exceeds said set first threshold value, said first comparison being repeated over time during operation of the actuator system, preferably at regular time intervals; and wherein a new control input ui is determined from the adjusted weighting factor wi and/or the adjusted physical maximum control limit uimax and applied to the actuators (3).