Aircraft Pylon Caisson Attachment Using Dimensional Separation
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Solution Overview
Problem
The existing attachment pylons for turboengines on aircraft generate aerodynamic perturbations due to increased width when trying to absorb the substantial forces and torque, leading to inefficiencies and mass gains, particularly with the increase in lateral distance of front attachments.
Innovation Solution
The attachment pylon design features two front attachments with fittings arranged externally relative to the lateral panels, increasing lateral distance without widening the caisson, allowing for efficient force absorption and reduced mass through double shear grip and a 'Fail Safe' function, while maintaining aerodynamic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the lateral distance of the two front attachments is increased to reduce forces for absorbing torque, then the torque absorption efficiency is improved, but the width of the caisson increases leading to aerodynamic penalties
Solution Approach 1:
The first fittings are arranged in three-dimensional space such that one fitting is positioned externally relative to the lateral panel while the other remains internal or at a different depth. This spatial arrangement in multiple dimensions allows the attachments to achieve greater lateral separation for improved torque absorption without increasing the external width envelope of the caisson, thus avoiding aerodynamic penalties.
2Strength
If the width of the caisson is increased to accommodate greater lateral distance between attachments, then the torque absorption capability is improved, but the aerodynamic efficiency deteriorates
Solution Approach 1:
By utilizing the third dimension (depth/extrusion direction) to position fittings at different locations relative to the lateral panel, the design achieves enhanced torque absorption capability through increased attachment separation without expanding the caisson's width. This maintains the aerodynamic profile while improving structural capability.
3Object-affected harmful factors
If the fittings are arranged internally relative to the lateral panel, then the aerodynamic efficiency is maintained, but the lateral distance between attachments is reduced leading to increased forces
Solution Approach 1:
The design strategically positions one fitting externally and one internally (or at different depths) relative to the lateral panel, creating optimal lateral separation for force distribution. This dimensional arrangement reduces the forces each attachment must bear for torque absorption while the external positioning of at least one fitting maintains aerodynamic efficiency by avoiding internal clutter.
Data Source
AI summary
An aircraft assembly including a wing element and an attachment pylon of a turboengine, including a rigid structure forming a caisson defined externally by a first longeron, a second longeron, and two lateral panels. The assembly also includes an attachment mechanism of the structure on the wing element, fitted with two front attachments, each including two first fittings solid with the associated lateral panel. For each front attachment, the two first fittings are arranged respectively on either side of their associated lateral panel.