Aircraft Engine Front Attachment Rod System Design

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Solution Overview

Problem

The existing front engine attachment systems for aircraft engines are complex and time-consuming to manufacture due to their solid beam structure, which requires lengthy machining processes.

Innovation Solution

A front engine attachment system featuring a beam fixed to an engine pylon with rod systems connected via clevis joints, allowing for a simplified design and the inclusion of backup safety fixing points to create an auxiliary load path in case of primary path failure, utilizing a pin and bores with a ball joint connection for robustness and ease of assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a solid beam structure is used in the front engine attachment system, then the structural strength and load-bearing capacity are improved, but the manufacturing complexity and production time increase significantly

Engineering Contradiction:
Improvestructural strengthVSAvoidmanufacturing complexity
Core Design Contradiction:
StrengthVSDevice complexity

Solution Approach 1:

The solid beam structure is divided into multiple discrete components: a beam element, rod elements, and clevis joints. This segmentation allows each component to be manufactured separately using simpler processes, then assembled together to form the complete attachment system, reducing overall manufacturing complexity while maintaining structural integrity through the jointed configuration.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The rod elements and beam element are combined through clevis joints to create a unified attachment system. The clevis joints merge the load-bearing functions of the rod and beam while allowing for articulated movement, achieving both structural strength and manufacturing simplicity through this combining approach.

Inventive Principle:
Principle #5Merging (Combining)

2Strength

If a solid beam structure is used in the front engine attachment system, then the load-bearing capacity is improved, but the production time and manufacturing cost increase

Engineering Contradiction:
Improveload-bearing capacityVSAvoidproduction time
Core Design Contradiction:
StrengthVSProductivity

Solution Approach 1:

By segmenting the beam into discrete rod and beam components that can be manufactured independently, the production process becomes more efficient. Each component can be produced parallelly using standardized processes, then quickly assembled together, significantly reducing total production time compared to manufacturing a single solid beam structure.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The attachment system incorporates articulated joints (clevis joints) that allow dynamic movement between components. This dynamic design enables the structure to adapt to load conditions while maintaining strength, and facilitates easier assembly and disassembly, improving productivity without compromising load-bearing capacity.

Inventive Principle:
Principle #15Dynamics

3Ease of manufacture

If a simplified rod and beam architecture is used, then the manufacturing ease is improved, but the structural robustness may be compromised

Engineering Contradiction:
Improvemanufacturing easeVSAvoidstructural robustness
Core Design Contradiction:
Ease of manufactureVSStrength

Solution Approach 1:

The clevis joints are pre-designed with integrated pin and bore configurations that ensure proper alignment and robust connection between components. This preliminary design of the joining mechanism ensures that the simplified architecture maintains structural robustness, as the joints are engineered to handle the required loads from the outset.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The clevis joint acts as an intermediary element between the rod and beam components. This intermediary structure provides a robust connection mechanism that maintains structural integrity while allowing for the simplified manufacturing of individual components. The clevis joint mediates the load transfer between components, ensuring robustness despite the modular architecture.

Inventive Principle:
Principle #24Intermediary (Mediator)

4Reliability

If backup safety fixing points are added to create an auxiliary load path, then the safety and reliability are improved, but the device complexity increases

Engineering Contradiction:
ImprovesafetyVSAvoidstructural complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

Backup safety fixing points are incorporated into the attachment system design in advance, creating an auxiliary load path that activates only if the primary load path fails. This beforehand provision of backup mechanisms ensures safety without significantly increasing normal operational complexity, as the backup system remains dormant until needed.

Inventive Principle:
Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The backup safety fixing points are designed to engage only when necessary, effectively discarding the primary load path components in the event of failure and recovering to the backup system. This selective engagement mechanism provides safety while maintaining operational simplicity during normal use, as the backup system does not interfere with the primary structure during normal operation.

Inventive Principle:
Principle #34Discarding and recovering

Data Source

PatentUS11572184B2Front engine attachment system for an aircraft engine, having rod systems with two rods
Publication Date: 2023.02.07 AIRBUS OPERATIONS (SAS)
  • US11572184B2 patent drawing
  • US11572184B2 patent drawing
  • US11572184B2 patent drawing

AI summary

A front engine attachment system for an engine of an aircraft, the front engine attachment system having an engine pylon having, in its front part, a frontal part having an attachment wall that has a front face, and a front engine attachment having a beam that is fixed against the front face and to which is fixed, on either side of a median plane, a rod system, wherein each rod system is fixed to the beam in an articulated manner by at least one first connection point, and is configured to be fixed to a front part of the engine in an articulated manner by at least one second connection point. Such a front engine attachment system thus has rod systems having two rods, allowing the shape of the rods and the shape of the beam to be simplified.