Propulsion Module Suspension Torque Reaction Bar
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Solution Overview
Problem
The existing suspension systems for propulsion units with two fan modules face challenges in managing torque generated by unequal thrusts, leading to overdimensioning of the pylon, increased weight, and limited adaptability to configuration changes or module failures.
Innovation Solution
A suspension system featuring a pylon with a hinged crossbar and a torque reaction bar that is swivelling on the pylon, with ends fixed to link rods, allowing for the limitation of relative displacements and stress reduction between modules, and enabling efficient integration and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pylon is positioned to accommodate unequal thrusts from two fan modules, then the torque problem is solved, but the pylon must be overdimensioned to ensure sufficient fatigue strength and static strength, significantly increasing the weight of the pylon and suspension system
Solution Approach 1:
The invention divides the load-bearing function into two separate components: the pylon handles vertical loads and positioning, while the torque reaction bar specifically handles the torque generated by unequal thrusts. This segmentation allows each component to be optimized for its specific function, preventing the pylon from being overdimensioned for torque resistance.
Solution Approach 2:
The torque reaction bar acts as an intermediary element between the two fan modules and the pylon. It transfers and balances the torque forces generated by unequal thrusts, allowing the pylon to focus on supporting vertical loads without being subjected to excessive torsional stresses that would require overdimensioning.
2Reliability
If the pylon is positioned in the vertical plane passing through the centre of gravity with asymmetric crossbar to balance torque, then the torque problem is solved, but the system becomes difficult to adapt to different configurations, module changes, or thrust variations
Solution Approach 1:
The torque reaction bar is designed to swivel on the pylon about an axis approximately parallel to its extension axis, providing dynamic adaptability. This swiveling capability allows the system to automatically adjust to different thrust conditions and module configurations without requiring rigid asymmetric positioning, thereby maintaining torque balance while enhancing versatility.
3Ease of manufacture
If a symmetric crossbar configuration is used with the pylon positioned midway between modules, then the assembly is simple, but unequal thrusts generate torque on the pylon requiring overdimensioning
Solution Approach 1:
The invention merges the symmetric simplicity of the crossbar configuration with the torque-balancing capability of an asymmetric arrangement by introducing the torque reaction bar. The crossbar maintains its symmetric, easy-to-manufacture form, while the torque reaction bar is added to specifically address the torque problem, allowing both simplicity and weight efficiency to coexist.
Data Source
AI summary
The invention relates to a system for suspending two modules of a propulsion unit, such as two fan modules, said system comprising a pylon (28) and a rudder bar (30). One part (30′) of the rudder bar is hinged to the pylon, while the opposing ends thereof are hinged to connecting rods (34, 36). The system also comprises a torque bar (40) which has an elongate shape and is mounted on the pylon such that it can pivot about an axis substantially parallel to an axis (B) of elongation of the torque bar, the opposing ends (42) of said bar being secured on each side of the above-mentioned part of the rudder bar.