Aircraft Thrust Reverser Rear Structure Integrating Acoustic Absorption
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Solution Overview
Problem
Existing thrust reversers with mobile grids in the aeronautical sector face challenges in improving acoustic function, which remains a significant concern due to noise emissions.
Innovation Solution
The integration of an acoustic absorption device within the rear support structure of the grids, featuring a network of cells and an acoustic skin that delimits a secondary gas flow vein, enhances acoustic performance while maintaining high aerodynamic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rear support structure of the grids is integrated with an acoustic absorption device, then the acoustic function is improved, but the device complexity increases
Solution Approach 1:
The patent merges the acoustic absorption device with the rear support structure of the grids by integrating the cell network and acoustic skin into the existing support structure. This combination allows the same structural element to perform both mechanical support and acoustic absorption functions, thereby improving acoustic performance without proportionally increasing device complexity
Solution Approach 2:
The rear support structure is designed to serve multiple functions: it provides structural support for the grids, absorbs acoustic noise through the integrated cell network, and maintains aerodynamic flow through the acoustic skin. This multi-functionality reduces the need for separate components, balancing improved acoustic function with controlled device complexity
2Productivity
If the acoustic skin delimits a secondary gas flow vein, then aerodynamic performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The acoustic skin is designed as a segmented structure with a network of cells that can be manufactured separately and then assembled into the rear support structure. This segmentation allows for simpler manufacturing of individual components while achieving the complex aerodynamic function of delimiting the secondary gas flow vein when assembled
Solution Approach 2:
The acoustic absorption device utilizes a porous cell network structure that serves dual purposes: acoustic noise absorption and aerodynamic flow management. The porous material structure allows gas flow to pass through while maintaining the delimitation of the secondary vein, achieving aerodynamic performance without requiring completely solid, complex-manufactured surfaces
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
This design effectively reduces sound intensity emerging from the propulsive system, addressing the acoustic challenges while ensuring high aerodynamic performance and structural integrity.
Implementation Method 1
said at least one rear grid support structure integrates an acoustic absorption device comprising a network of cells as well as a skin covering the cells
Data Source
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AI summary
The invention relates to a thrust reverser (30) for an aircraft propulsion unit, comprising a fixed structure (31), at least one cowl (33) and a plurality of cascades of deflection vanes (32), the cowl (33) and the cascades of vanes (32) forming a system capable of translational movement relative to the fixed structure (31) along a longitudinal central axis (A1), the mobile system further comprising at least one rear cascade-support structure (45) to which a rear end of the cascades of vanes (32) is fixed, the rear structure (45) extending in a circumferential direction (43) of the reverser. According to the invention, the rear structure (45) incorporates an acoustic-absorption device (56) comprising an array of cells (58) and a skin (50) covering the cells, the skin having a first surface (50a) arranged facing the cells, and a second surface (50b) bounding part of a secondary flow path (21B).