Multilayered Acoustic Panel with Independent Membrane Vibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional acoustic panels, such as plasterboard, reflect sound waves and do not effectively absorb sound energy across a broad range of frequencies, leading to reverberation issues in buildings, and existing solutions like the Bellmax panel face limitations in sound absorption and flammability compliance.
Innovation Solution
A multilayered acoustic panel with a substantially air-impermeable outer membrane layer, an intermediate layer covering apertures in a sound-absorbing inner layer, and air gaps between the membrane and intermediate layers, allowing the membrane to vibrate independently and enhance sound absorption across various frequencies while maintaining a conventional appearance and compliance with building regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional plasterboard panel is used, then the panel can be installed easily and painted like conventional plasterboard, but the panel reflects sound waves and does not effectively absorb sound energy
Solution Approach 1:
The panel is divided into multiple functional layers: a plasterboard-like outer layer for aesthetic and installation purposes, and an inner acoustic core with porous structure for sound absorption. This segmentation allows each layer to perform its specific function optimally while maintaining overall panel performance.
Solution Approach 2:
The panel combines different materials with complementary properties: a rigid plasterboard-like material for structural integrity and paintability, combined with a porous acoustic core material for sound energy dissipation. The composite structure achieves both aesthetic/convenience requirements and acoustic performance.
2Loss of energy
If soft sound-absorbing materials like carpet or curtains are used, then sound absorption improves, but the aesthetic appearance and ability to blend with conventional wall surfaces deteriorates
Solution Approach 1:
The outer layer of the panel is designed to copy the appearance, texture, and paintability of conventional plasterboard. This allows the acoustic panel to blend seamlessly with existing wall surfaces and architectural designs while the inner porous layer provides sound absorption functionality.
Solution Approach 2:
The panel uses a composite structure where an aesthetically pleasing rigid outer layer is combined with a porous sound-absorbing inner layer. This allows the panel to meet both aesthetic requirements and acoustic performance targets simultaneously.
3Ease of manufacture
If the Bellmax panel structure is used with membrane layer and perforated sound absorbing layer, then the panel can be painted and installed like conventional plasterboard, but the sound absorption is limited to very specific frequencies and flammability issues arise
Solution Approach 1:
The acoustic core uses a porous material structure that allows sound waves to penetrate and dissipate energy through friction and viscous effects within the pores. This porous structure provides broadband sound absorption across multiple frequencies, unlike resonant systems that only absorb at specific frequencies.
Solution Approach 2:
The panel design modifies key parameters including the porosity, thickness, and density of the acoustic core to optimize broadband sound absorption performance. These parameter adjustments enable effective sound absorption across a wide frequency range while maintaining paintability and installation characteristics.
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 panel achieves significant and uniform sound absorption across a broad range of frequencies, improving speech intelligibility and meeting stringent building regulations, including flammability standards, by utilizing a multilayered structure with an intermediate layer and air gaps to enhance sound wave energy absorption.
Implementation Method 1
those portions of the membrane layer which overlie the apertures are free to vibrate independently of the second portion in response to sound waves incident on the membrane layer
Implementation Method 2
those portions of the membrane layer which overlie the apertures are free to vibrate independently
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A multilayered acoustic panel (1) including: a substantially air impermeable outer membrane layer (3); an underlying second portion bonded to the membrane layer (3), the second portion including an intermediate layer (5); and an inner layer (7) underlying the second portion, the inner layer (7) having a plurality of apertures (6) therein, said apertures (6) being covered by the intermediate layer (5) of the second portion, wherein the membrane layer (3) and second portion are not bonded together where the membrane layer (3) overlies the apertures (6) such that those portions of the membrane layer (3) which overlie the apertures (6) are free to vibrate independently of the second portion in response to sound waves incident on the membrane layer (3).