Removable Aerospace Leading Edge Modules with Dagger Pin Attachments
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Solution Overview
Problem
Existing leading edge systems for aerospace vehicles are not easily removable or replaceable, leading to increased maintenance, repair, and operational costs, as well as reduced availability for missions due to the need for grounding and on-site maintenance.
Innovation Solution
A leading edge system comprising removable modules with a hollow box substructure and dagger pin attachment elements, allowing for easy assembly and replacement of damaged components, reducing downtime and maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If leading edge systems are fixed and non-removable, then structural integrity and stability are improved, but maintenance time and operational downtime increase significantly
Solution Approach 1:
The leading edge system is divided into multiple removable modules (40, 40a, 40b) that can be independently detached and replaced. Each module includes a hollow box substructure (42) with attachment elements that allow quick separation from the aerospace vehicle structure, enabling maintenance without grounding the entire vehicle for extended periods.
Solution Approach 2:
The attachment elements (74, 74a, 74b including dagger pins and nuts) are designed to provide dynamic connectivity - securely fastening modules during flight while allowing rapid detachment during maintenance. This dynamic capability transitions the system from fixed to removable on demand, resolving the contradiction between structural stability and maintenance accessibility.
2Reliability
If leading edge systems are fixed installation, then reliability during operation is improved, but ease of repair and maintenance accessibility worsen
Solution Approach 1:
By segmenting the leading edge into modular units (40, 40a, 40b) with standardized attachment interfaces, the system maintains operational reliability through secure fastening while enabling easy removal and replacement of damaged modules at maintenance facilities, significantly improving repair accessibility.
Solution Approach 2:
The modular leading edge modules can be extracted from the aerospace vehicle structure and transported to specialized maintenance facilities. This extraction capability allows comprehensive repair and inspection in controlled environments rather than requiring on-site maintenance, improving both ease of repair and quality of service.
3Productivity
If leading edge modules are removable and replaceable, then maintenance time and operational availability are improved, but device complexity and attachment mechanism requirements increase
Solution Approach 1:
The attachment system is segmented into discrete, standardized elements (dagger pins 74a, nuts 74b, attachment openings 34a, 60) that simplify the removal and replacement process. While the mechanism adds some complexity, the modular nature enables parallel maintenance operations on multiple modules simultaneously, improving overall maintenance productivity.
Solution Approach 2:
The dagger pin and nut attachment mechanism is designed to be self-contained within each module assembly, allowing maintenance personnel to service individual modules independently without requiring complex external equipment or systems, thereby improving maintenance efficiency despite the added attachment complexity.
4Reliability
If thermally insulative tiles are fixed to leading edges, then thermal protection effectiveness is improved, but cost of maintenance and replacement increases
Solution Approach 1:
The thermal protection system is integrated into removable modular leading edge units. This segmentation allows damaged thermal tiles to be replaced by simply swapping modules rather than individually replacing tiles on a fixed structure, significantly reducing maintenance costs while maintaining thermal protection effectiveness through proper module design and materials.
Solution Approach 2:
The modular design enables damaged leading edge modules to be removed and replaced with new or refurbished units. The removed modules can be recovered, refurbished, and returned to service, creating a cost-effective maintenance cycle that reduces overall maintenance costs while ensuring thermal protection reliability through controlled refurbishment processes.
Data Source
Figure 1~2A
Figure 2B
Figure 2C
AI summary
There is provided a leading edge system (10) for an aerospace vehicle. The leading edge system has at least one structural member. The leading edge system further has a plurality of removable modules removably attached to the at least one structural member. Each removable module has a hollow box substructure (42) and at least one flange portion disposed along a first end (52) of the hollow box substructure. The leading edge system further has a plurality of first attachment elements (70) configured for attaching the at least one flange portion (54) of the removable module to a first end portion of the at least one structural member. The leading edge system further has a plurality of second attachment elements (74) configured for attaching a second end of the hollow box substructure opposite the flange portion, to a second end portion of the at least one structural member opposite the first end portion.