Layer-Core-Layer Acoustic Ceiling Panel Airflow Resistance Design
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Solution Overview
Problem
Existing acoustic ceiling panels in lay-in ceiling structures face challenges in achieving optimal noise reduction coefficients (NRC) as they are often designed based on overall airflow resistance, which may not accurately reflect the contribution of individual layers and core in determining acoustic absorption.
Innovation Solution
The acoustic ceiling panel design features a core with minimal airflow resistance (<100 MKS rayls) and specific airflow resistance ranges for the front and rear layers (300-800 and 300-1200 MKS rayls, respectively), optimizing noise reduction by balancing the airflow resistances of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceiling panels are designed with overall airflow resistance in the range of 1000-2000 MKS rayls to achieve optimal acoustic absorption, then noise reduction coefficient (NRC) of at least 1.0 can be achieved, but the core cannot provide the bulk of the airflow resistance
Solution Approach 1:
The patent divides the panel into three distinct functional segments: a core portion with low airflow resistance (≤100 MKS rayls) and front/rear layers with specific resistance ranges (front: 300-800 MKS rayls, rear: 300-1200 MKS rayls). This segmentation allows each component to contribute differently to the overall acoustic performance, with the layers providing the primary airflow resistance while the core provides structural support with minimal resistance contribution.
Solution Approach 2:
Different portions of the panel are assigned different airflow resistance properties optimized for their specific functions. The front and rear layers are designed with moderate resistance (300-1200 MKS rayls) to provide acoustic absorption, while the core is designed with very low resistance (≤100 MKS rayls) to avoid dominating the airflow characteristics. This local differentiation of properties enables the panel to achieve NRC≥1.0 through the combined effect of its components rather than relying on the core alone.
2Manufacturing precision
If the core provides the bulk of airflow resistance, then overall panel resistance can be controlled, but acoustic absorption optimization is limited
Solution Approach 1:
The patent segments the airflow resistance function across different components: the core is assigned low resistance (≤100 MKS rayls) while the front and rear layers are assigned moderate resistance (300-1200 MKS rayls each). This segmentation enables precise control of the overall panel resistance by summing the contributions of individual components, while simultaneously optimizing acoustic absorption through the layered structure that allows sound wave interaction with multiple resistance interfaces.
Solution Approach 2:
The patent specifies precise parameter ranges for each component's airflow resistance to achieve optimal acoustic performance. The core is constrained to ≤100 MKS rayls, the front layer to 300-800 MKS rayls, and the rear layer to 300-1200 MKS rayls. These parameter specifications enable manufacturers to control the overall panel resistance while ensuring the acoustic absorption performance meets NRC≥1.0, resolving the contradiction between manufacturing control and performance optimization.
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
This approach ensures optimal noise reduction coefficients (at or near 1.0 NRC) by focusing on the combination of airflow resistances of the front, rear, and core layers, potentially exceeding conventional airflow resistance ranges while maintaining superior acoustic properties.
Implementation Method 1
layers in the form of coatings and/or coverings of material (sometimes called skins) having sound-absorbing properties
Implementation Method 2
the overall airflow resistance of the panel in the thickness direction (height) of the panel
Data Source
AI summary
An acoustic ceiling panel for a lay-in or suspended ceiling includes a core portion, and front and rear layers covering front and rear sides, respectively, of the core portion. The air flow resistance of the core portion does not exceed about 100 MKS rayls. The air flow resistance of the front layer lies in the range of about 300 to about 800 MKS rayls. The air flow resistance of the rear layer lies in the range of about 300 to about 1200 MKS rayls. The panel would be supported on a grid suspended below a structural ceiling to form an air space therebetween.