Acoustic Sandwich Panel Mounting With Threaded Flank Assembly
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing acoustic sandwich panels in turbojet engine nacelles face challenges in maintaining acoustic integrity and structural continuity while reducing manufacturing complexity and cost, particularly in the junction of the air inlet with the nacelle casing.
Innovation Solution
The acoustic panel design incorporates a flank with a threaded portion orthogonal to the plane of an outer flank face, featuring an insert with a threaded portion or a barrel nut arrangement, allowing for a simple and cost-effective assembly that maintains acoustic protection and structural continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bonding or welding techniques are used to join sandwich panels, then structural and acoustic continuity is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The sandwich panel is divided into modular sections with standardized flanges at the ends. Each panel segment can be independently manufactured and assembled, simplifying the overall manufacturing process while maintaining structural integrity through the flange connections.
Solution Approach 2:
Flanges serve as intermediary components that facilitate connection between sandwich panels and other structural elements. These flanges provide standardized interfaces that simplify assembly while maintaining both structural and acoustic continuity across joints.
2Strength
If flange-type assembly with bolts or rivets is used for connections, then structural continuity is achieved, but the area without acoustic core increases and manufacturing becomes more complex
Solution Approach 1:
The flange is integrated as part of the sandwich panel structure itself, merging the connection element with the panel body. This eliminates separate connection components and reduces the overall assembly complexity while maintaining structural continuity.
Solution Approach 2:
The flange serves multiple functions: it provides structural connection, maintains acoustic continuity, and offers a standardized interface for assembly. This multi-functionality reduces the need for additional specialized components.
3Strength
If complex panel-manufacturing techniques are used to shape flanges and join skins, then structural integrity is maintained, but manufacturing cost increases
Solution Approach 1:
Flanges are pre-formed as integral parts of the sandwich panel during the primary manufacturing process, rather than being shaped separately and assembled later. This preliminary action eliminates complex secondary operations and reduces manufacturing cost.
Solution Approach 2:
The manufacturing process parameters are optimized to directly form the flange structures during panel fabrication, changing from multi-step complex shaping to integrated single-process formation, thereby reducing cost while maintaining integrity.
Data Source
AI summary
An acoustic panel including a first skin and a second skin extending on either side of an acoustic core, the acoustic panel also includes a flank connecting the first skin and the second skin and which has an outer flank face, the acoustic panel includes at least one threaded portion extending in a direction substantially orthogonal to a first plane containing the outer flank face. An assembly including such a panel.