MEMS-Tunable Helmholtz Metasurface for Server Noise Without Overheating
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Solution Overview
Problem
Existing acoustic absorbers are not suitable for heat-sensitive environments, such as servers, as they reduce heat dissipation and can lead to overheating, which affects server performance and may cause shutdowns.
Innovation Solution
Implementing metasurfaces with bimorph microelectromechanical systems (MEMS) actuators in Helmholtz resonators that adjust airflow to achieve inverse phase cancellation of specific frequencies, effectively absorbing sound without significantly increasing heat levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing acoustic absorbers are used to reduce server noise, then sound absorption is improved, but heat dissipation is significantly reduced
Solution Approach 1:
The patent employs dynamic control of acoustic absorber properties through MEMS actuators that can adjust the resonance frequency and absorption characteristics in real-time. This allows the system to adapt to varying noise frequencies from server fans while maintaining optimized heat dissipation pathways, resolving the static trade-off between noise reduction and heat management.
Solution Approach 2:
The invention changes the physical parameters of the acoustic absorber by using tunable resonance frequencies and adjustable absorption coefficients. By dynamically modifying these parameters based on operational conditions, the system can achieve effective noise reduction at specific frequencies without compromising overall heat dissipation performance.
2Object-affected harmful factors
If acoustic absorbers are used to reduce fan noise, then noise levels decrease, but server performance may be reduced due to overheating
Solution Approach 1:
The dynamic adjustment capability allows the acoustic absorber to respond to changing operational conditions, maintaining noise reduction effectiveness while preventing heat buildup that could impact server reliability. The system can switch between different absorption modes based on thermal and acoustic sensor feedback.
Solution Approach 2:
The patent incorporates feedback mechanisms using sensors to monitor both acoustic and thermal conditions. This feedback loop enables real-time adjustment of the acoustic absorber properties, ensuring that noise reduction does not compromise server temperature management and thus maintaining server reliability and performance.
3Object-affected harmful factors
If existing acoustic absorbers are used, then sound waves are absorbed, but heat dissipation is compromised
Solution Approach 1:
The patent applies local quality by creating spatially varying acoustic absorption properties within the server housing. Different regions have optimized absorption characteristics for specific frequency ranges, allowing targeted noise reduction while preserving heat dissipation pathways in other regions. This localized approach enables simultaneous noise control and thermal management.
Solution Approach 2:
By dynamically changing the absorption parameters of different regions based on measured noise and heat conditions, the system can optimize the balance between sound wave absorption and heat dissipation. The可调 parameters allow the system to shift between absorption and ventilation modes as needed.
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 efficient sound absorption at targeted frequencies while maintaining minimal heat dissipation, thus preventing overheating and ensuring server performance.
Implementation Method 1
a resonating element, including a bimorph microelectromechanical systems (MEMS) actuator, within each unit cell of the metasurface can be controlled to change airflow in the air cavity
Implementation Method 2
The bimorph microelectromechanical systems device can change from a first angle or curve, based on a first amount of control signaling energy, to a second angle or curve, based on a second amount of control signaling energy
Data Source
AI summary
The technology described herein is directed towards a metasurface arranged with unit cells for narrowband sound absorption, in which the unit cells are based on Helmholtz resonators that can have their resonant frequencies adjusted via MEMS actuators. A sound absorbing unit-cell is designed and constructed based on a general resonance frequency, and includes a neck portion and air chamber dimensioned to resonate close to the desired resonance frequency and thereby inverse phase cancel corresponding narrowband frequencies of incoming sound waves. A bimorph MEMS actuator and/or moveable part in the resonators, controlled by a controller, facilitates changing of the airflow the unit cells to adjust the resonant frequencies thereof, to cancel acoustic waves of different frequencies corresponding to noise, which can change over time. The unit cells can be distributed as part of a metasurface, which can be positioned proximate to a noise source to phase cancel the noise.