Damping Rear Engine Attachment for Turbojet Force Filtering
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Solution Overview
Problem
Existing propulsion systems for turbojet engines fail to effectively filter and dampen the substantial forces and vibrations originating from the rear part of the engine, particularly in conventional architectures where the core and fan form an integrated unit.
Innovation Solution
A propulsion assembly with a damping rear engine attachment featuring an elastically deformable element, such as an elastomer ring, integrated into the engine attachment system to absorb and filter forces, including a body connected via connecting axes in longitudinal and vertical planes, allowing for efficient force transfer and damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid attachments are used to connect the jet engine core to the pylon, then the structural strength and stability are improved, but the ability to filter and dampen forces and vibrations from the rear engine part deteriorates
Solution Approach 1:
The engine attachment system is divided into multiple independent attachments (first attachment, second attachment, third attachment) distributed at different locations on the jet engine core. This segmentation allows each attachment to handle specific force components independently, enabling the system to maintain structural strength while filtering harmful forces through the distributed architecture.
Solution Approach 2:
A damping element is introduced as an intermediary component between the jet engine core and the pylon structure. This damping element acts as a mediator that absorbs and dissipates vibrations and harmful forces while still transmitting necessary structural loads, thereby resolving the contradiction between strength and vibration filtering.
2Ease of operation
If distinct load paths are provided for forces perpendicular and parallel to the axis of rotation, then the force management is improved, but the ability to dampen rear engine forces deteriorates
Solution Approach 1:
The force management system is segmented into multiple independent attachments positioned at different locations on the jet engine core. Each attachment can be optimized for specific force directions (perpendicular or parallel to the axis of rotation), allowing efficient force management while maintaining the capability to dampen rear engine forces through the distributed structure.
Solution Approach 2:
Each attachment is designed with specific local characteristics optimized for its particular force management function. The first attachment handles perpendicular forces, the second handles parallel forces, and the third provides additional support, allowing each component to be locally optimized while collectively damping harmful rear engine forces.
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 propulsion assembly effectively filters substantial forces while reacting less substantial forces, such as the weight of the rear engine core, thereby enhancing the transfer of forces to the aircraft's wing.
Implementation Method 1
at least one elastomer ring interposed between the body and the connecting axis
Implementation Method 2
a damping rear engine attachment that has a first end connected to the primary structure and a second end connected to the rear part of the jet engine core
Data Source
AI summary
A propulsion assembly with a damping rear engine attachment, aircraft having at least one such propulsion assembly. The propulsion assembly has an engine attachment system, connecting a primary structure of a pylon and a motor, which has a plurality of attachments each having at least one engine anchor point on the motor, all the engine anchor points being approximately positioned in the same transverse plane, a damping rear engine attachment connecting the primary structure and the rear part of the jet engine core, the damping rear engine attachment forming a force path that has at least one elastically deformable element.