Aircraft Engine Pylon Attachment Layout for Lower Drag and Weight
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Solution Overview
Problem
Existing propulsion assemblies for aircraft jet engines are bulky, leading to increased weight and reduced aerodynamic efficiency.
Innovation Solution
A propulsion assembly with a pylon and attachment device featuring reduced attachment sizes, including a lever with ball joint links and complementary front engine attachments, which react to lateral and vertical loads, and a main rod for isostatic load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional rigid attachment structures are used to fasten the jet engine to the pylon, then the structural strength and reliability are ensured, but the weight increases and aerodynamic performance deteriorates
Solution Approach 1:
The attachment structure is divided into multiple independent elements: upper spar attachment, lower spar attachment, and web attachment. Each element is optimized separately to minimize weight while maintaining strength, allowing the engine to be secured through distributed connections rather than a single bulky structure
Solution Approach 2:
The attachment structure incorporates articulated rods and hinges that allow controlled movement and flexibility. The rods connecting the engine to the pylon can pivot at joints, enabling the structure to adapt to operational stresses dynamically rather than relying on rigid fixed connections, reducing overall material requirements
2Stability of the object's composition
If traditional attachment structures with multiple rods and connection points are used, then the load distribution and structural stability are improved, but the space occupied increases and aerodynamic efficiency decreases
Solution Approach 1:
Multiple attachment functions are combined into integrated components. The upper spar and lower spar attachments work together with the web attachment as a unified system, eliminating the need for separate redundant structures. The articulated rods serve both as structural supports and as load-transfer elements, merging multiple functions into single elements
Solution Approach 2:
The attachment structure utilizes three-dimensional spatial arrangement of articulated joints and rods. By positioning connection points at strategic locations on the engine casing and pylon, the structure achieves stability through spatial distribution rather than through increased volume in any single dimension, optimizing the aerodynamic profile
3Force
If conventional engine attachment methods are used, then the load-bearing capacity is sufficient, but the aerodynamic profile is compromised and drag increases
Solution Approach 1:
The attachment structure is designed to be minimally intrusive to the aerodynamic flow. By extracting only the essential load-bearing elements and positioning them strategically, the design removes unnecessary bulk that would interfere with airflow, allowing the engine to be secured with minimal impact on the aerodynamic profile
Solution Approach 2:
The attachment structure concentrates strength where needed through localized reinforcement at connection points, rather than uniformly increasing the size of the entire attachment device. The articulated rods and joints are positioned to optimize load paths while maintaining a streamlined overall shape that reduces 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.