Structural Engine Duct for Rear Pylon Load Transfer
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Solution Overview
Problem
Existing propulsion systems for aircraft engines struggle with efficient load transfer to the rear of the pylon, necessitating improved load distribution mechanisms.
Innovation Solution
A propulsion system with a structural attachment comprising a duct with a fixed structure and a mobile structure, featuring an upper beam, ring, and centering rods, which allows for efficient load transfer from the engine to the pylon, incorporating a duct that surrounds the engine core and includes a mobile panel for easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional pylon attachment system is used, then the engine can be mounted to the aircraft structure, but the load transfer efficiency to the rear of the pylon is insufficient
Solution Approach 1:
The patent combines the structural attachment functions into an integrated duct system that surrounds the engine core. The duct incorporates beams, rings, and attachment points that collectively perform load transfer, merging multiple structural functions into a single integrated component rather than separate attachment elements.
Solution Approach 2:
The patent introduces a three-dimensional duct structure with longitudinal beams, circumferential rings, and radial attachment points. This multi-dimensional configuration distributes loads across multiple spatial dimensions, transferring forces more effectively to the rear of the pylon compared to traditional planar attachment systems.
2Strength
If the duct structure is made fully fixed and enclosed, then structural integrity is improved, but maintenance access to the engine core becomes difficult
Solution Approach 1:
The patent incorporates mobile panels within the duct structure that can be moved or removed to provide maintenance access. These dynamic elements allow the duct to transition between a closed structurally-integral state during operation and an open accessible state during maintenance, reconciling the contradiction between structural integrity and ease of repair.
Solution Approach 2:
The duct structure is segmented into fixed portions and mobile panel portions. The mobile panels can be independently accessed and moved, allowing maintenance personnel to reach the engine core without compromising the overall structural integrity of the duct when closed.
3Object-affected harmful factors
If the engine core is fully surrounded by a fixed duct, then aerodynamic and acoustic functions are improved, but access for maintenance and inspection is restricted
Solution Approach 1:
The mobile panels enable the duct to dynamically adjust between providing full aerodynamic and acoustic coverage during engine operation and providing open access during maintenance. The panels can be moved to maintain protective functions when needed and opened when maintenance is required.
Solution Approach 2:
The mobile panels act as intermediaries between the engine core and the external environment. During operation, they provide aerodynamic and acoustic protection; during maintenance, they can be moved to allow direct access while still maintaining a structural framework that supports the duct's protective functions.
Data Source
AI summary
A propulsion system includes an engine, a pylon box, and a structural attachment. The engine includes an engine casing and an engine core. The pylon box has a front part and a rear part. The rear part is configured to attach the engine to an aircraft structure. The structural attachment has a front end configured to attach to the engine casing and a rear end configured to attach to the pylon which allows load transfer to the aircraft structure through the pylon box.