Turbojet Engine Front Attachment Bracket Thrust Load Alignment
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Solution Overview
Problem
Turbojet engines experience significant bending due to thrust loads, which reduces their lifespan when attached to aircraft fixing struts using conventional fastening structures that do not effectively absorb these loads without inducing bending forces.
Innovation Solution
A front attachment mechanism with an intermediate part connected to the turbojet engine fan cowl, featuring a first and second attachment system aligned with the engine axis, allowing thrust load absorption and transmission without generating bending forces, utilizing a top and lower bracket system with primary and secondary fixing points and anti-torque controls to ensure torque absorption by the fixing strut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fastening structures are used to attach the turbojet engine to the fixing strut, then the engine can be securely mounted, but the engine is subjected to significant bending forces that reduce its lifespan
Solution Approach 1:
An intermediate part is introduced between the attachment mechanism and the engine, connected by a second attachment system with convergence point on the engine axis. This intermediary component helps align the thrust load transmission path with the engine axis, preventing bending forces while maintaining secure mounting.
Solution Approach 2:
The attachment system uses multiple convergence points along the engine axis (first attachment system convergence point downstream, second attachment system convergence point upstream) to create a three-dimensional load distribution that aligns forces with the engine's longitudinal axis, eliminating bending moments.
2Device complexity
If the front attachment device absorbs thrust loads through a single attachment point, then the structure is simpler, but the thrust load creates bending moments on the engine
Solution Approach 1:
The attachment device is segmented into multiple attachment systems (first and second attachment systems) with distinct convergence points along the engine axis. This segmentation distributes the thrust load transmission through multiple paths, preventing bending moments while maintaining structural simplicity through modular design.
3Force
If the attachment system uses multiple convergence points along the engine axis, then bending forces are eliminated, but the device complexity increases
Solution Approach 1:
Multiple attachment systems with different convergence points are merged into a unified front attachment device that functions as an integrated thrust load absorption mechanism. The top bracket and lower bracket are combined with the intermediate part to create a cohesive structure that eliminates bending forces without proportionally increasing complexity.
Data Source
AI summary
A front attachment device for fastening a turbojet engine to an aircraft fixing strut. The attachment device is adapted to absorb the turbojet engine thrust loads, and includes a top bracket, and a lower bracket. A thrust load absorption vector results from a first convergence point of primary vectors passing through primary fixing points that couple the top bracket to the lower bracket and a second convergence point of secondary vectors passing through secondary fixing points that couple the lower bracket to the turbojet engine. The thrust load absorption vector transmits the turbojet engine thrust loads to the fixing strut, and extends along a longitudinal axis of the turbojet engine.