Aircraft Rear Engine Attachment Reducing Bulk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rear engine attachments for aircraft engines are bulky, causing significant aerodynamic disturbances and space constraints, which hinder the performance of the jet engine by blocking its secondary jet.
Innovation Solution
A rear engine attachment design featuring a pylon with a reduced bulk structure, comprising specific linkages and link points that allow for rotational and linear movements, forming an isostatic assembly to adapt to thermal expansion, and reducing the transmission of torsional movements, thereby minimizing bulk and enhancing aerodynamic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rear engine attachment structures are used to withstand engine stresses and moments, then structural strength and stability are ensured, but the attachment occupies significant space in the fork, increasing aerodynamic blocking of the secondary jet
Solution Approach 1:
The rear engine attachment is divided into multiple separate link elements (first link, second link, third link, fourth link) that work together to form the attachment structure. This segmentation allows each link to be optimized for specific load paths while reducing the overall bulk occupied by the attachment in the fork, thereby decreasing aerodynamic blocking of the secondary jet.
2Stability of the object's composition
If rigid fixed attachments are used to ensure structural stability, then moment resistance is improved, but adaptability to thermal expansion is reduced
Solution Approach 1:
The link attachment system incorporates rotational joints that allow controlled movement and adjustment. These dynamic joints enable the attachment to adapt to thermal expansion of the engine while maintaining structural stability under operational loads, resolving the contradiction between rigidity and adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves a reduced bulk and improved aerodynamic performance by allowing for adaptive mobility and reduced structural constraints, enhancing the engine's efficiency and reducing aerodynamic blocking of the secondary jet.
Implementation Method 1
each said link point to said second fitting comprises a bore passing through said second fitting, for each said link associated with said said link point, a bore passing through said link and said said link point, said said link point being mounted without play at said link, said said link point being mounted with play at said second fitting
Data Source
AI summary
A rear engine attachment for an engine of an aircraft which comprises a pylon having a bottom face, the rear engine attachment comprising a first fitting configured to be fixed against the bottom face and having a wall, a second fitting configured to be secured to a structural casing of the engine, two front links and two rear links, which are fixed by one and the same main link point to the wall and by two link points on either side of the second fitting. Such a motorization assembly allows for a reduction of the bulk, in particular at the rear engine attachment, which helps in improving the overall performance of the motorization assembly.