Acoustic Metamaterial Unit Cell for Broadband Soundproofing and Heat Transfer
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Solution Overview
Problem
Existing acoustic metamaterials face challenges in achieving simultaneous effective soundproofing in broad frequency bands while allowing for efficient heat dissipation and fluid flow, with previous solutions either being impermeable or having narrow operating frequency bands.
Innovation Solution
An acoustic metamaterial unit cell comprising a frame, a perforated constraint, and a flexible membrane with holes, where the size, shape, and material of the holes are optimized for both soundproofing and flow efficiency, and the structure is designed to enhance heat transfer by vibrating under sound wave excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If common perforation plate or grate plate with large pore area is used for manufacturing shells or soundproofing cover, then flow passing and heat dissipation are improved, but soundproof performance in medium- to low-frequency is very poor
Solution Approach 1:
The plate is segmented into numerous small perforations (diameter 1-5mm) distributed across the surface, rather than using large pores. This segmentation allows the plate to function as multiple small Helmholtz resonators, improving soundproof performance while maintaining adequate flow passage capability.
Solution Approach 2:
The invention changes the critical parameters of the perforation structure: reducing pore diameter from large openings to 1-5mm, optimizing pore density (1000-10000 pores per square meter), and adjusting the depth-to-diameter ratio of perforations. These parameter changes enable the plate to achieve effective soundproofing in medium- to low-frequency ranges while maintaining sufficient flow passage.
2Object-affected harmful factors
If micro-perforated panel with diameter less than 1 mm matched with back panel is used, then acoustic insulation in medium- or high-frequency is improved, but heat-dissipating and flow-passing effects are restricted
Solution Approach 1:
The invention optimizes the parameter range of perforation diameter to 1-5mm (rather than less than 1mm), pore density to 1000-10000 pores per square meter, and perforation depth to create effective Helmholtz resonance. These parameter adjustments broaden the frequency range of soundproofing effectiveness while significantly improving flow passage and heat dissipation capabilities compared to conventional micro-perforated panels.
Solution Approach 2:
The invention copies the successful soundproofing mechanism of micro-perforated panels (Helmholtz resonance) but scales up the dimensions and optimizes the parameters to achieve a balance between soundproofing performance and flow passage capability, rather than simply using smaller pores with a back panel.
3Object-affected harmful factors
If air passage type soundproof window with resonance chamber is used, then soundproof effect in medium- to low-frequency is improved, but structure size becomes very large which is hard to use in occasions with strict size requirements
Solution Approach 1:
Instead of using a single large resonance chamber, the invention segments the resonance function into numerous small perforations distributed across the plate surface. Each perforation acts as a small Helmholtz resonator, achieving the same overall soundproofing effect with a much more compact structure that meets strict size requirements.
Solution Approach 2:
The invention transitions from a three-dimensional resonance chamber structure to a two-dimensional perforated plate structure. By distributing resonance functionality across the plate surface through multiple small perforations, the solution achieves effective soundproofing in medium- to low-frequency ranges while maintaining a compact, thin-profile structure suitable for applications with strict size constraints.
4Temperature
If flow passages and power equipment are installed to increase convection, then heat-dissipating performance is improved, but system complexity, manufacturing cost, and maintenance cost are increased
Solution Approach 1:
The perforated plate serves multiple functions simultaneously: it acts as a soundproofing barrier (blocking noise transmission), a flow passage structure (allowing fluid flow for cooling), and a heat transfer enhancement surface (with perforations that promote turbulence and convective heat transfer). This multi-functionality eliminates the need for separate flow passages and power equipment, reducing system complexity while maintaining effective heat dissipation.
Solution Approach 2:
The invention merges the soundproofing function and heat dissipation function into a single integrated structure. The perforated plate combines acoustic insulation capabilities with fluid flow passage and heat transfer enhancement, eliminating the need for separate components and reducing overall system complexity, manufacturing cost, and maintenance requirements.
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 enables good soundproofing performance across a broad frequency range while ensuring smooth heat flow and gas/liquid flow, improving heat exchange efficiency and reducing the complexity and cost of manufacturing.
Implementation Method 1
the structure is designed to enhance heat transfer by vibrating under sound wave excitation
Implementation Method 2
the chamber between the micro-perforated panel and the back panel forms Helmholtz Resonant Absorber. When the frequency of the incoming sound wave is consistent with the special frequency of the Helmholtz Resonant Absorber, resonance friction happens between the gas flow and the chamber structure, which result a great lot of sound energy is converted into heat energy
Implementation Method 3
accelerate the efficiency of convection and heat exchange
Data Source
AI summary
The present invention relates to the acoustic metamaterial structural unit with the function of soundproof, flow-passing and heat-transferring enhancement, which comprises a frame, a constraint placed in the frame and a piece of membrane covering at least one surface of the frame; both the frame and the membrane are respectively placed at least one hole. Besides, the present invention also provides the acoustic metamaterial composite plate and the composite structure constructed with the acoustic metamaterial structural unit; the method for adjusting the frequency and the assemble method. The present structural unit possesses better soundproof property than the routine perforated plated or micro-perforated plate in broad operating frequency. And also the enough heat flow, gas flow or fluid flow can pass through smoothly. The diffuse efficiency of the heat energy of the mediums on both sides of the hole is increased by the vibration of the self-structure under the excitation of the soundwave and further the efficiency of heat exchange is accelerated. The method for assembling the acoustic metamaterial composite structure with the acoustic metamaterial structural units is simple. The operation performance is steady.