Cable-Driven End Effector Positioning for Aircraft Fuselage Reach
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Solution Overview
Problem
Existing devices for automating drilling and riveting operations on large aircraft fuselages are complex, time-consuming to implement, and limited by the width between parallel rails, restricting precision and reach.
Innovation Solution
A cable-driven apparatus with a spool and arch beam system allows for precise, lightweight, and customizable movement of end effectors around a circular axis, eliminating the need for tracks on the part, enabling both circumferential and radial movement of end effectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If parallel flexible rails are used to position the end effector, then the end effector can be moved along the structure, but the device becomes complicated and time-consuming to implement
Solution Approach 1:
The patent removes the complex parallel rail system and replaces it with a simplified cable-driven mechanism. The end effector is positioned using cables routed through guides and pulleys, eliminating the need for rigid parallel rails while achieving the same positioning function with fewer components
Solution Approach 2:
The patent replaces the mechanical rail-guided system with a cable-driven mechanical system. Instead of moving the end effector along fixed parallel rails, the invention uses tensioned cables that can be routed more flexibly and installed more quickly on the aircraft fuselage structure
2Area of stationary object
If parallel flexible rails are used to position the end effector, then the end effector can be moved along the structure, but the width between rails and reachable surface area are limited
Solution Approach 1:
The patent transitions from a two-dimensional rail-based positioning system to a three-dimensional cable-driven system. Cables can be routed in multiple directions and planes, allowing the end effector to reach surfaces that are not accessible within the constrained width between parallel rails
Solution Approach 2:
The patent uses flexible cables instead of rigid rails, allowing the positioning system to adapt to the curved surfaces of the aircraft fuselage. The cables can be routed along the contours of the structure, providing access to a larger surface area without requiring wide spacing between support elements
3Weight of stationary object
If a cable-driven system with spool and arch beam is used, then the apparatus is smaller and weighs less, but precise circumferential movement control is required
Solution Approach 1:
The patent incorporates feedback mechanisms to monitor and control the position of the end effector. Sensors detect the location and orientation of the tool, providing real-time data that feeds back to the control system to make precise adjustments, ensuring accurate positioning despite the lightweight cable-driven construction
Solution Approach 2:
The patent replaces heavy mechanical positioning mechanisms with a lightweight cable-driven system controlled by electronic actuators and motors on the spool. This substitution reduces weight while maintaining precision through electronic control and feedback, rather than relying solely on mechanical rigidity
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 solution provides a more efficient, precise, and cost-effective method for performing operations on aircraft fuselages, enhancing production rates and allowing for various operations without the complexity and limitations of traditional systems.
Implementation Method 1
The device utilizes a cable wound around a spool to move end effectors. The ends of the cable are fixed to an arch beam.
Implementation Method 2
A brake may be provided to apply pressure to the arch to stop circumferential movement or to hold a circumferential position.
Data Source
AI summary
An apparatus for performing operations on a part, and in particular on the fuselage of an aircraft. The apparatus utilizes a spool with a cable wound therearound to move end effectors. The ends of the cable are fixed to an arched beam. Thus, rotation of the spool either moves the beam or moves the spool. The apparatus moves along rails that may be mounted to a fixed structure like floors or walls.