Acoustic Panel Cell Structure for Broad Frequency Damping
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Solution Overview
Problem
Current acoustic panels are limited in their ability to effectively dampen a wide range of audible frequencies due to manufacturing and material forming constraints, often resulting in designs that can only address sound waves at a single or double frequency, and they are not easily scalable or manufacturable using additive manufacturing techniques.
Innovation Solution
A novel cell structure for acoustic panels featuring a cavity with a continuous boundary wall and a suspended, axisymmetric chamber, where sound waves are deflected and converted into mechanical heat, combined with a tunable support structure for enhanced frequency damping, and produced using additive manufacturing to create arrays of interconnected cell structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the surface area of acoustic panels is increased to dampen a wider range of frequencies, then the frequency damping capability is improved, but the manufacturing complexity and material forming difficulty increase
Solution Approach 1:
The acoustic panel is divided into multiple unit cells, each containing a cavity and suspended chamber. This segmentation allows the complex frequency damping function to be distributed across simpler, repeating modular units, making manufacturing more feasible while maintaining broad frequency damping capability through the collective effect of multiple cells
Solution Approach 2:
A chamber is suspended within the cavity of each unit cell, creating a nested structure where one acoustic element is contained within another. This nesting allows multiple acoustic functions to be integrated in a compact volume, increasing effective surface area and frequency damping capability without proportionally increasing overall panel complexity
2Ease of manufacture
If traditional manufacturing techniques are used for acoustic panels, then existing production processes are maintained, but the ability to create complex geometries and integrate functions is limited
Solution Approach 1:
The design embraces the capabilities of additive manufacturing to create dynamic, complex geometries that would be impossible with traditional manufacturing. The suspended chamber configuration and optimized cavity shapes can be directly fabricated using 3D printing, enabling geometric complexity without increasing manufacturing difficulty
Solution Approach 2:
The patent transitions from traditional 2D panel designs to 3D structures with suspended chambers and complex spatial arrangements. Additive manufacturing enables exploitation of the third dimension for creating acoustic paths and resonant structures that add functional versatility without complicating the manufacturing process
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 cell structure effectively dampens a broader range of audible frequencies, is easily integrated into various panel dimensions, and can be efficiently manufactured, leading to improved acoustic treatment in applications such as aircraft, automotive, and HVAC systems.
Implementation Method 1
acoustic panels to dampen the sound waves
Implementation Method 2
sound waves are deflected and converted into mechanical heat
Data Source
AI summary
An improved cell structure that enables design improvements to acoustic panels is provided. The provided cell structure for an acoustic panel is (i) capable of damping a wider range of audible frequencies, (ii) able to be easily combined and integrated into a variety of panel dimensions, and (iii) manufacturable using additive manufacturing techniques such as direct metal laser sintering (DMLS).