Suspended Ceiling Sound Absorbing Module with Air-Permeable Front Cover
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Solution Overview
Problem
Existing sound absorbing modules for suspended ceilings do not effectively optimize sound absorption coefficients at frequencies of 125 to 4000 Hz, particularly in office environments where speech frequencies between 250 to 2000 Hz are critical, and they lack aesthetic concealment of the grid structure.
Innovation Solution
A sound absorbing module comprising a sound absorbent element and an air-permeable front cover with a flow resistance of 200 to 800 Pas/m, where the front cover is arranged at a distance of 20 to 60 mm from the sound absorbent element, and optionally includes diffraction elements and a non-planar surface to enhance absorption, while using materials like glass fibre or mineral wool for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ceiling slab with solid cover is used, then structural strength is maintained, but sound absorption coefficient at frequencies of 125 to 4000 Hz is insufficient
Solution Approach 1:
The front cover is made air-permeable with a flow resistance within the range of 200 to 800 Pas/m, allowing sound waves to pass through while maintaining structural integrity. This porous structure enables the cover to absorb sound energy effectively across the frequency range of 125 to 4000 Hz, particularly improving speech frequency absorption.
Solution Approach 2:
The flow resistance of the front cover is optimized within a specific range (200 to 800 Pas/m) to maximize sound absorption. By controlling this parameter, the ceiling slab achieves improved acoustic performance without compromising structural strength, resolving the contradiction between reliability and sound absorption.
2Reliability
If the front cover is made highly permeable to improve sound absorption, then acoustic performance increases, but structural strength and stability decrease
Solution Approach 1:
The flow resistance is controlled within an optimized range (200 to 800 Pas/m) that balances acoustic performance and structural strength. This parameter optimization ensures the front cover remains sufficiently strong while maintaining effective sound absorption properties.
Solution Approach 2:
The ceiling slab combines a solid core element with an air-permeable front cover, creating a composite structure that leverages the strengths of both materials. The solid core provides structural integrity while the porous cover delivers acoustic performance, resolving the strength-absorption contradiction.
3Shape
If the grid structure is concealed for aesthetic purposes, then visual appearance improves, but access to plenum space becomes more difficult
Solution Approach 1:
The ceiling system is divided into modular ceiling slabs that can be individually removed. This segmentation allows the grid to remain concealed for aesthetic purposes while enabling easy access to the plenum space by simply removing specific slabs when maintenance is required.
Solution Approach 2:
The removable ceiling slabs act as intermediaries between the aesthetic concealed grid and the plenum space. They provide a clean visual appearance when in place but can be easily removed to access the space behind, mediating between aesthetic requirements and maintenance needs.
4Reliability
If ceiling tiles are securely mounted to resist forces, then stability under earthquake or pressure changes improves, but ease of demounting for maintenance decreases
Solution Approach 1:
The mounting system transitions from a permanently fixed state to a dynamically adjustable state. The ceiling slabs are designed to be securely mounted during normal operation to resist forces, but can be easily demounted when maintenance is required, providing dynamic adaptability to different operational needs.
Solution Approach 2:
The ceiling system uses modular segmented slabs that can be independently mounted and demounted. Each slab is designed to be securely fixed during operation but easily removable for maintenance, allowing the system to balance stability and demountability through its modular segmented structure.
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 solution provides optimized sound absorption coefficients across the critical frequency range of 125 to 4000 Hz, particularly enhancing speech frequency absorption, while also concealing the grid structure for improved aesthetics and maintaining secure mounting during forces.
Implementation Method 1
the sound absorbent element is arranged for absorbing sound energy when sound waves collide with it
Implementation Method 2
the front cover is air permeable with a flow resistance within the range of 200 to 800 Pas/m
Implementation Method 3
the sound absorbent element is arranged for absorbing sound energy when sound waves having passed through the front cover collide with it
Data Source
AI summary
The present invention concerns a sound absorbing module (2) for a suspended ceiling (1), comprising a sound absorbent element (6) and a front cover (7). Said front cover (7) is arranged at a distance from the sound absorbent element (6), and according to the present invention the front cover (7) has a flow resistance within the range of 200 to 800 Pas/m. The present invention further concerns a suspended ceiling (1) comprising said sound absorbing module (2).