Thrust Reverser Intermediate Support Frame Cantilever Reduction
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Solution Overview
Problem
The existing thrust reverser devices for turbojet engines face issues with aerodynamic drag and interference with the aircraft wing due to a long cantilever in the rail-slide guiding system, leading to potential jamming and increased flexibility of the nacelle, which complicates the use of composite materials for structural reinforcement.
Innovation Solution
The introduction of an intermediate support frame that allows the guiding assembly of the thrust reverser half-cowl to circumferentially shift in a radial plane relative to the longitudinal axis, reducing the cantilever and eliminating interference with the aerodynamic fairing panel, thereby reducing the risk of jamming and the need for composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rail-slide guiding system uses a long cantilever to allow cowl movement, then the cowl can be displaced between direct jet and reverse jet positions, but the rail is prone to jamming and the nacelle flexibility increases
Solution Approach 1:
An intermediate support frame is introduced as a mediator between the half-beam and the guiding assembly. This frame provides an additional support point that reduces the effective cantilever length of the rail, thereby decreasing the risk of rail jamming while still allowing the cowl to be displaced between direct jet and reverse jet positions.
2Reliability
If the rail width is increased to prevent jamming, then the rail is less prone to jamming, but the aerodynamic lines are modified and drag increases
Solution Approach 1:
The intermediate support frame acts as an intermediary that provides structural support without requiring an increase in rail width. By distributing the load through this additional support structure, the rail can maintain its original dimensions and preserve aerodynamic lines while still preventing jamming through the reduced effective cantilever length.
3Strength
If composite materials are used to reinforce the guiding assembly, then the structural resistance to fatigue loads is improved, but the device complexity and cost increase
Solution Approach 1:
The intermediate support frame serves as a structural intermediary that distributes and reduces the fatigue loads on the guiding assembly. By providing this additional support structure, the system achieves the required fatigue resistance through improved load distribution rather than relying on complex composite material implementations.
Data Source
AI summary
The present disclosure relates to a thrust reverser device for a turbo jet engine nacelle including a fixed thrust reverser support structure having a longitudinal support half beam able to support a thrust reverser half-cowl, and the thrust reverser half-cowl mounted such that it can slide on the fixed structure in a direction substantially parallel to a longitudinal axis of the device via a guidance assembly, between a direct-jet position and a reverse-thrust position. In particular, the fixed structure includes a structure for offsetting the guidance assembly that guides the half-cowl circumferentially in a plane radial to the longitudinal axis between its various positions with respect to the half-beam on which the half-cowl is mounted.