Electromechanical Actuation System with Linear Actuators for Rotorcraft
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Solution Overview
Problem
Modern hydromechanical flight control systems in rotorcraft are complex, heavy, and costly due to their numerous mechanical and hydraulic components, which complicates control and increases weight and operational costs.
Innovation Solution
An electromechanical actuation system with three linear actuators and a summing member, where the actuators have different ranges of motion and a braking system to lock the third actuator, allowing the first and second actuators to compensate for faults by increasing their range of motion, reducing the need for redundant mechanical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydromechanical systems are used with redundancy components, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical and hydraulic systems with an electromechanical system using three linear actuators. Each actuator includes a motor, drive shaft, and lead screw, eliminating the need for hydraulic pumps, pipes, valves, and mechanical linkages while maintaining redundant control capability through the three-actuator configuration
Solution Approach 2:
The three linear actuators are designed to perform multiple functions: they can independently control rotor pitch, collectively control rotor thrust, and provide redundant backup for each other. This multi-functionality allows the system to maintain reliability without requiring separate dedicated backup systems
2Ease of operation
If conventional hydromechanical systems are used, then control functionality is maintained, but weight increases
Solution Approach 1:
The patent eliminates heavy hydraulic components including pumps, reservoirs, pipes, and hydraulic fluid, replacing them with lighter electromechanical linear actuators. The direct-drive linear actuators with lead screws provide sufficient mechanical advantage without requiring heavy hydraulic infrastructure
3Ease of operation
If conventional hydromechanical systems are used, then control functionality is maintained, but manufacturing cost increases
Solution Approach 1:
The electromechanical linear actuators eliminate the need for complex hydraulic circuit assembly, sealing installations, and fluid filling operations. The modular actuator design with standardized components (motors, lead screws, mounting brackets) simplifies manufacturing and reduces assembly costs compared to custom-hydraulic system integration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system reduces the number of components, weight, and cost while maintaining reliable control, enabling efficient and redundant flight control through electric actuators, replacing conventional mechanical systems.
Implementation Method 1
first, second, and third linear actuators having respective first, second, and third ranges of motion
Implementation Method 2
a braking system configured to lock the third linear actuator
Data Source
AI summary
Electromechanical actuation systems and methods are provided. The electromechanical actuation system includes first, second, and third linear actuators having respective first, second, and third ranges of motion and an output member coupled to the first, second, and third linear actuators such that a position of a selected portion of the output member is based on actuation of the first, second, and third linear actuators.