Aircraft Control Stick Actuator with Asymmetrical Spring Feedback
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Solution Overview
Problem
Existing control systems for aircraft control surfaces, particularly mini-sticks, lack a natural opposing force mechanism, especially in electrical or electronic systems, which requires additional devices to provide feedback to the pilot, and fail to offer varying force magnitudes and asymmetrical responses effectively.
Innovation Solution
A compact control device with a rotary shaft and multiple slabs and springs that provide varying and asymmetrical opposing forces, allowing the pilot to sense angular positions and thresholds, featuring a stationary and moving finger with interposed springs for return forces, and optional motor-driven displacement for automatic pilot modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrical or electronic control systems are used, then the device can be more compact and responsive, but no opposing force is generated naturally requiring additional auxiliary devices
Solution Approach 1:
The patent combines electrical control system components with mechanical feedback components into a single integrated actuator assembly. The auxiliary device for generating opposing force is merged with the electrical actuator, allowing the system to maintain compactness while providing natural tactile feedback to the pilot through the control stick.
2Measurement precision
If opposing force is made proportional to angular offset throughout the stroke, then control precision is improved, but the pilot cannot sense the approaching end of the stroke
Solution Approach 1:
The patent implements asymmetrical opposing force characteristics where the force profile changes depending on the position within the stroke. The auxiliary device generates force that is proportional to angular offset for most of the stroke, then increases sharply near the endpoint, creating an asymmetric response that provides both precision control and tactile endpoint warning to the pilot.
3Device complexity
If equal opposing force is applied in both directions, then the control system is simple, but asymmetrical control responses cannot be achieved
Solution Approach 1:
The patent implements a dynamic force generation mechanism where the opposing force characteristics can be adjusted based on direction and position. The auxiliary device is configured to provide different force magnitudes and profiles depending on whether the stick is moved left or right, enabling asymmetrical control responses while maintaining a relatively simple mechanical structure through directional springs or cam mechanisms.
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
Enables pilots to physically sense approaching end positions and adjust control surfaces with arbitrary thresholds, enhancing control precision and safety through customizable response curves and motor-assisted operation.
Implementation Method 1
a first spring interposed between the first and second slabs
Implementation Method 2
a second spring interposed between the first and third slabs
Data Source
AI summary
A device for remotely controlling the control surfaces of an aircraft, the device comprising: an actuator member pivotable about an axis and entraining a rotary shaft; a stationary finger parallel to the shaft and supported at a radial distance from the shaft; a moving finger secured to the shaft and supported at a radial distance therefrom, both fingers being parallel to the shaft; a first slab supported at a radial distance from the shaft beside the two fingers on one side thereof and suitable for turning about the axis of the shaft; a second slab supported at a radial distance from the shaft beside the two fingers on their side opposite from the first slab, and suitable for turning about the axis of the shaft; a third slab supported at a radial distance from the shaft beside the second slab at an angular distance therefrom and suitable for turning about the axis of the shaft; a first spring between the first and second slabs; and a second spring between the first and third slabs.