Aircraft Frame Fabrication Line With Arc Stations and Pulsed Transfer
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Solution Overview
Problem
The existing methods for fabricating aircraft frames are inefficient, leading to delayed assembly due to the slow production of discrete components, and there is a need for a method that can increase work density and accommodate variations in frame dimensions and forms.
Innovation Solution
The implementation of an assembly line system where frames are fabricated as arcuate portions of a full circle, allowing multiple stations to work synchronously on frames advancing through an arc-shaped line, with a drive unit pulsing the frames through stations to perform various operations efficiently, including machining and inspection, while utilizing sacrificial material to ensure consistent fastener grip lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frames are fabricated using traditional discrete component methods, then manufacturing flexibility is maintained, but production speed and work density are insufficient to meet assembly timing requirements
Solution Approach 1:
The frame fabrication process is segmented into discrete stations arranged in an arc, with each station performing a specific operation (machining, drilling, inspection, etc.). Frames are divided into multiple work segments that can be processed simultaneously at different stations, enabling high-rate production while maintaining flexibility through modular station design.
Solution Approach 2:
The assembly line employs a pulsed advancement system where frames are moved through the arc-shaped line in synchronized pulses rather than continuous motion. This dynamic pulsing allows stations to complete operations during pause intervals while frames are stationary, then rapidly advance frames to the next position, maximizing work density and production speed.
2Productivity
If multiple stations work synchronously on frames in an arc-shaped line, then work density increases, but the physical footprint of the assembly line increases
Solution Approach 1:
The assembly line is configured in an arc-shaped path rather than a straight line, allowing stations to be arranged along a curved trajectory. This curvature enables multiple stations to work synchronously on frames passing through the arc while compacting the overall footprint, as the arc geometry allows stations to be positioned closer together in space while maintaining adequate work zones.
Solution Approach 2:
The pulsed advancement system adds a temporal dimension to the fabrication process, allowing stations to operate in synchronized cycles rather than requiring all stations to be simultaneously accessible. Frames are advanced in pulses through the arc, with each pulse coordinating the state of multiple stations, effectively utilizing time as an additional dimension to increase work density without proportionally increasing physical space requirements.
3Productivity
If frames are advanced through the assembly line in pulses, then synchronization of multiple stations is achieved, but control complexity increases
Solution Approach 1:
The control system incorporates feedback mechanisms that monitor the position and state of frames as they move through the pulsed assembly line. Each station reports its operational status and frame processing completion, allowing the central controller to synchronize pulse timing and coordinate station operations dynamically, managing control complexity through real-time feedback loops.
Solution Approach 2:
The control system is designed as a universal multi-functional platform that manages multiple stations, coordinates pulsed advancement, monitors frame positions, and adjusts synchronization timing. This universal controller handles diverse functions across all stations through standardized interfaces and protocols, reducing overall system complexity compared to having separate control systems for each station.
4Adaptability or versatility
If the assembly line is designed to accommodate variations in frame dimensions and forms, then adaptability increases, but device complexity increases
Solution Approach 1:
Different stations in the arc-shaped assembly line are configured with specialized capabilities tailored to specific frame sections or operations. Each station can be optimized for particular frame dimensions or features it encounters, allowing the overall system to accommodate frame variations through localized station specializations rather than requiring every station to handle all variations.
Solution Approach 2:
The assembly line incorporates adjustable parameters such as pulse timing, advancement speed, and station activation sequences that can be modified to accommodate different frame dimensions and forms. By changing operational parameters rather than physical infrastructure, the system maintains adaptability to frame variations while minimizing increases in device complexity.
Data Source
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AI summary
Systems and methods are provided for fabrication of frames for aircraft. One such method for fabricating a frame (150) for an aircraft (10) comprising receiving a frame (150) comprising a web (564), a shear tie foot (562), and sacrificial material (554) that increases a thickness of the shear tie foot (562); machining the shear tie foot (562) to a thickness that, in combination with a thickness of a skin (50), corresponds with a grip length of a fastener (510); placing the shear tie foot (562) against an inner mold line of the skin (50); and installing the fastener (510) through the skin (50) and the frame (150) to fasten the frame (150). One such system for fabricating a frame (150) of an aircraft (10), the system comprising an array (160) of stations that are arranged in an arc corresponding to a shape of a frame (150), comprising a machining station (120, 122) that removes sacrificial material (554) from the frame (150); and a drive unit (102) that advances the frame (150) through the stations.