Acoustic Attenuation Panel With Expandable Core for Single-Cycle Curing
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Solution Overview
Problem
The existing method for manufacturing acoustic attenuation panels requires two polymerization cycles, increasing time and energy consumption, and necessitates the use of specific composite materials and joining elements for assembly, which is inefficient and costly.
Innovation Solution
Incorporating an expandable core between the wings of a C-shaped reinforcement to stabilize the structure during polymerization, allowing a single polymerization cycle and reducing manufacturing time and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If two polymerization cycles are used to manufacture the acoustic attenuation panel, then the C-shaped reinforcement can react compressive loads, but the manufacturing time and energy consumption increase
Solution Approach 1:
The expandable core is introduced in its compressed state before polymerization, and it automatically expands during the single polymerization cycle to provide the necessary support. This preliminary positioning allows the C-shaped reinforcement to be properly supported throughout the entire polymerization process without requiring a separate pre-stiffening cycle, thereby reducing manufacturing time while maintaining structural strength.
Solution Approach 2:
The expandable core utilizes temperature-induced parameter changes by expanding from a compressed state to an expanded state during the polymerization process. This automatic expansion provides progressive support to the C-shaped reinforcement as the polymerization proceeds, enabling the structure to withstand compressive loads throughout the single polymerization cycle without requiring multiple cycles.
2Strength
If two polymerization cycles are used, then the C-shaped reinforcement gains stiffness, but the energy consumption increases
Solution Approach 1:
The expandable core is pre-positioned in its compressed state before polymerization begins. During the single polymerization cycle, it automatically expands to provide the necessary stiffness support to the C-shaped reinforcement. This eliminates the need for a second polymerization cycle, thereby reducing energy consumption while achieving the required structural stiffness.
Solution Approach 2:
The expandable core performs the function of providing stiffness support through its own automatic expansion during polymerization, without requiring external intervention or a separate stiffening cycle. This self-service mechanism reduces the total energy consumption by eliminating redundant polymerization cycles while maintaining the necessary structural properties.
3Stability of the object's composition
If specific composite materials and joining elements are used for assembly, then the panel structure is stable, but the device complexity increases
Solution Approach 1:
The expandable core integrates multiple functions into a single component: it provides structural support, maintains spacing between the C-shaped reinforcement and polymerization tool, and enables single-cycle polymerization. This merging of functions eliminates the need for separate joining elements and complex assembly procedures, thereby reducing device complexity while maintaining structural stability.
Solution Approach 2:
The expandable core serves multiple purposes simultaneously: it acts as a spacer, a support structure, and a mechanism to enable single-cycle polymerization. This multi-functionality replaces the need for multiple specialized components and joining elements, simplifying the overall assembly process while ensuring structural stability during manufacturing.
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 use of an expandable core stabilizes the C-shaped reinforcement during polymerization, enabling a single cycle and thus reducing manufacturing time and costs while maintaining structural integrity.
Implementation Method 1
said expandable core being configured to occupy a non-expanded first state, at a first temperature, in which the expandable core occupies a first volume, and an expanded second state, at a second temperature greater than the first temperature, in which the expandable core occupies a second volume greater than the first volume
Data Source
AI summary
An acoustic attenuation panel with at least one acoustically resistive layer, at least one reflective layer, at least one cellular structure and at least one C-shaped reinforcement which are interposed between the acoustically resistive and reflective layers, and at least one expandable core, positioned between the first and second wings of the C-shaped reinforcement, which increases in volume during a polymerization cycle. Also a method for manufacturing such a panel.