Aircraft Propulsion System Pylon Attachment Design
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Solution Overview
Problem
Current propulsion systems for aircraft turbojets attached under the wing face challenges in effectively transferring loads to the rear of the pylon, which can lead to inefficiencies in structural rigidity and inertia.
Innovation Solution
A propulsion system design featuring a turbojet with a pylon and specific attachment elements, including a front engine attachment, a front arch with articulated arms and rods, and a rigid structure with ribs, that transmit forces to the rear of the pylon, enhancing load transfer and structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a rigid pylon structure with traditional attachment elements is used, then structural strength is maintained, but load transfer to the rear of the pylon is insufficient
Solution Approach 1:
The attachment structure is divided into multiple functional components: a front engine attachment, a front arch with arms, and lateral rods. This segmentation allows each component to specialize in transferring specific forces to the rear of the pylon, improving overall load transfer efficiency without requiring the entire structure to be overly complex.
Solution Approach 2:
The invention introduces articulated arms that extend laterally from the front arch, adding a transverse dimension to the load transfer path. This dimensional expansion allows forces to be distributed more effectively to the rear of the pylon through multiple pathways (longitudinal and transverse), enhancing structural efficiency.
2Stability of the object's composition
If traditional engine attachment elements are used, then manufacturing simplicity is maintained, but structural rigidity and inertia are inefficient
Solution Approach 1:
The arms and rods are designed with articulated connections rather than rigid fixed joints, allowing the structure to dynamically adapt to various loading conditions. This dynamic capability enhances structural rigidity under load while maintaining manufacturing simplicity through standardized articulation mechanisms.
Solution Approach 2:
The attachment structure combines different material properties in the rigid pylon body versus the articulated arms and rods. The main pylon body uses high-strength rigid materials for structural integrity, while the arms and rods can utilize lighter materials optimized for their specific load transfer functions, improving overall rigidity-efficiency ratio.
3Ease of operation
If the front engine attachment is simplified, then ease of assembly is improved, but load transfer capability is reduced
Solution Approach 1:
The front arch acts as an intermediary structure between the engine attachment and the rear pylon. It receives forces from the engine attachment and redistributes them through its arms and connections to the lateral rods, which then transfer loads to the rear of the pylon. This intermediary mechanism enables effective force transfer while keeping individual components relatively simple for easy assembly.
Data Source
AI summary
An aircraft propulsion system comprising a turbojet having a fan casing with a rear face, a pylon with a front part and a lower spar with a rear fitting fixed to it, and a front engine attachment fixed between an upper part of the fan casing and the front part, a front arch having two arms, each having a first end fixed to the lower spar and a second end fastened in an articulated manner to the rear face, and two lateral rods, each having a first end fastened in an articulated manner to the rear fitting and a second end fastened in an articulated manner to the rear face.