Server Rack Metasurface Modules for Noise Control Without Airflow Loss
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Solution Overview
Problem
Existing acoustic absorbers in heat-sensitive environments, such as server rooms, reduce noise but impair heat dissipation, leading to potential server shutdowns due to overheating.
Innovation Solution
Deployment of metasurface modules with Helmholtz resonators on server racks that absorb specific frequencies without significantly increasing heat levels, using 3D printing technology to construct lightweight, compact units that maintain airflow and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing acoustic absorbers (foam panels, fabric-wrapped panels) are used to absorb server noise, then noise reduction is achieved, but heat dissipation is significantly reduced, leading to high heat levels that can reduce server performance or cause shutdowns
Solution Approach 1:
The patent changes the fundamental parameters of the acoustic absorber by using metasurface technology with resonant structures instead of traditional porous foam materials. This parameter change allows the material to achieve noise absorption through resonant frequency targeting rather than broadband porous absorption, thereby maintaining heat dissipation while reducing noise at specific frequencies
Solution Approach 2:
The patent employs composite metasurface structures combining multiple materials with different acoustic and thermal properties. These composite structures include resonant elements, backing layers, and damping materials arranged in specific configurations that provide noise cancellation while preserving thermal management capabilities
2Object-affected harmful factors
If acoustic absorbers are deployed to reduce fan noise, then noise levels decrease, but airflow obstruction increases, impairing thermal management
Solution Approach 1:
The patent applies local quality by designing acoustic treatments with specific local properties - the metasurface structures are positioned and configured to provide noise absorption only in directions where noise propagation occurs, while leaving airflow paths open and unobstructed. This localized approach ensures noise reduction without compromising overall airflow
Solution Approach 2:
The acoustic treatment is segmented into multiple discrete metasurface elements rather than using continuous foam panels. This segmentation allows airflow to pass through and around the elements while still providing noise absorption, effectively decoupling the noise reduction function from airflow obstruction
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
Effectively suppresses noise across multiple frequencies while maintaining optimal thermal performance and airflow, preventing overheating and enhancing server efficiency.
Implementation Method 1
metasurface modules with Helmholtz resonators on server racks that absorb specific frequencies
Implementation Method 2
acoustic absorbers function by capturing sound waves and converting their energy into heat
Data Source
AI summary
The technology described herein is directed towards modular metasurfaces arranged with unit cells for narrowband, wideband and/or multiband sound absorption, in which the unit cells are based on Helmholtz resonators that are deployed in a server rack, proximate to a server, without substantially obstructing airflow from the server fan(s). Each sound absorbing unit-cells is designed and constructed based on a specific resonance frequency, and includes a neck portion and air chamber dimensioned to resonate at the desired resonance frequency and thereby inverse phase cancel corresponding narrowband frequencies of incoming sound waves. Differently-dimensioned unit cells can be built into a single metasurface module, thereby facilitating wideband and/or multiband sound absorption with that metasurface. The modular metasurfaces can be attached to the sidewalls of a server rack, or positioned in otherwise empty slots above and below a server, optionally coupled to blanking panels for covering the openings of those slots.