Jet Engine Pylon Attachment Structure for Compact Load Transfer
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Solution Overview
Problem
Existing propulsion assemblies for aircraft jet engines are bulky, leading to weight and aerodynamic inefficiencies.
Innovation Solution
A propulsion assembly with a pylon and attachment device featuring reduced size attachments, including a front engine attachment and complementary front engine attachment, utilizing ball joint links and isostatic load transfer to optimize aerodynamics and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional engine attachments are used, then the jet engine can be securely attached to the pylon, but the propulsion assembly becomes bulky and heavy
Solution Approach 1:
The attachment system is divided into separate functional components: upper attachments connect the fan casing to the upper spar, lower attachments connect the central casing to the lower spar, and thrust rods handle axial loads. This segmentation allows each component to be optimized for its specific function, reducing overall weight while maintaining strength.
Solution Approach 2:
The attachment points are distributed in three-dimensional space around the engine - upper attachments at the top, lower attachments at the bottom, and thrust rods positioned laterally. This spatial distribution creates efficient load paths and allows compact arrangement, reducing the bulky appearance while maintaining structural integrity.
2Strength
If traditional engine attachments are used, then the jet engine can be securely attached to the pylon, but the nacelle fairing size increases
Solution Approach 1:
By separating the attachment functions into distinct upper and lower attachments plus thrust rods, each component can be compact and efficiently positioned. This eliminates the need for large, bulky attachment structures that would otherwise be required to handle all loads through a single integrated system.
Solution Approach 2:
The articulations allow the attachments to dynamically adapt to load conditions and engine movements, enabling a more compact geometric arrangement of the attachment points. This dynamic capability reduces the space required for the attachment mechanism while maintaining full load-bearing capacity.
3Strength
If traditional engine attachments are used, then the jet engine can be securely attached to the pylon, but the aerodynamic performance deteriorates
Solution Approach 1:
The segmented attachment system allows for streamlined positioning of each component, with upper and lower attachments arranged vertically and thrust rods positioned laterally. This compact, organized arrangement minimizes protrusions into the airflow and allows for more effective fairing integration, reducing aerodynamic drag.
Data Source
AI summary
A propulsion assembly for an aircraft, the propulsion assembly having a jet engine having a fan casing and a central casing around a longitudinal axis and having a vertical median plane passing through the longitudinal axis, an attachment pylon having a rigid structure that takes the form of a box that has a front wall and an upper spar extending forwardly in respect to the front wall, a front engine attachment fixed between an upper area of the fan casing and a front end of the upper spar, and a complementary front engine attachment fixed between an upper area of the central casing and a lower end of the front wall.