Monolithic Acoustical System for Direct Mounting
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Solution Overview
Problem
Existing acoustical systems for ceilings and walls require a plenum space to achieve high noise reduction coefficients (NRC) and are not effective when mounted directly on acoustically hard surfaces, limiting their application in retrofit and original construction where space is limited.
Innovation Solution
A composite structure comprising outward perforated drywall panels attached to inward sound insulation layers or sound absorbing boards, secured with Z-shaped furring strips and acoustically transparent coating, allowing high NRC performance even without a plenum space by directly mounting on acoustically hard surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional acoustical systems are mounted directly on acoustically hard surfaces, then installation simplicity is improved, but noise reduction coefficient (NRC) performance deteriorates
Solution Approach 1:
The patent combines perforated drywall panels with sound-absorbing material layers to create a composite structure that achieves high NRC values (0.8-0.9) when mounted directly on hard surfaces. The composite nature allows the structure to function both as a structural ceiling/wall component and as an effective sound absorber without requiring plenum space.
Solution Approach 2:
The sound-absorbing material layer is made porous to enable sound wave penetration and absorption. This porosity allows the structure to achieve high noise reduction coefficients by absorbing sound energy that passes through the perforated drywall panels, resolving the contradiction between direct mounting simplicity and acoustic performance.
2Reliability
If plenum space is provided behind acoustical systems, then noise reduction coefficient (NRC) performance is improved, but space utilization deteriorates
Solution Approach 1:
Instead of requiring plenum space behind the acoustical system to achieve high NRC values, the patent inverts the approach by designing a structure that achieves superior acoustic performance when mounted directly on hard surfaces. This eliminates the need for plenum space while maintaining or improving noise reduction coefficients.
Solution Approach 2:
The patent changes the structural parameters of the acoustical system by using perforated drywall panels combined with sound-absorbing material layers in a specific configuration. This parameter change allows the system to achieve high NRC values without requiring the traditional plenum space, thus improving space utilization while maintaining acoustic performance.
3Reliability
If perforations are visible on ceiling or wall surfaces, then acoustical function is improved, but aesthetic appearance deteriorates
Solution Approach 1:
The sound-absorbing material layer acts as an intermediary between the perforated drywall panels and the visible surface. This layer fills the perforations and provides a smooth, continuous appearance while maintaining the acoustic function by allowing sound waves to pass through the structure and be absorbed by the porous material.
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 composite structure achieves high NRC values ranging from 0.8 to 0.9, maintaining performance without a plenum space, making it suitable for retrofit and original applications where space is limited, and providing superior acoustics in 'high-end' spaces.
Implementation Method 1
sound absorbing or sound insulation media, preferably in the form of rigid panels 12
Implementation Method 2
porous low density mineral fiber panels
Implementation Method 3
coated with a non-blocking acoustical finish 19 or covered with a fabric or other acoustically transparent material
Data Source
Figure 1
Figure 2
AI summary
A composite structure for improving the acoustical properties of a low NRC membrane including a sound absorbing layer and a porous, scrim covered, perforated drywall layer.