Resonant Composite Sound-Attenuating Materials for Lower-Cost Noise Control
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Solution Overview
Problem
Existing sound attenuation materials are expensive to manufacture and install, and they often fail to provide adequate sound attenuation.
Innovation Solution
A new sound attenuation material comprising particles with a denser core and a compliant elastic coating, surrounded by a matrix, where the core is denser than the matrix and the coating, and the coating includes filler materials like polymer or glass micro-balloons, is developed. The particles are designed to resonate at specific frequencies, and their proportions are optimized for effective sound attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing sound attenuation materials are used, then sound attenuation is provided, but manufacturing and installation costs are high
Solution Approach 1:
The patent uses composite particles consisting of a dense core material (metal, mineral, or ceramic) coated with an elastic polymer material. This composite structure combines the density of the core for sound mass with the elasticity of the coating for energy dissipation, achieving effective sound attenuation at lower cost than existing specialized acoustic materials.
Solution Approach 2:
The patent varies the density, size, and elastic properties of the core particles and coating materials to optimize sound attenuation across different frequency ranges. By adjusting these parameters, the material achieves broadband noise reduction without requiring expensive specialized components for each frequency range.
2Object-affected harmful factors
If existing sound attenuation materials are used, then sound attenuation is provided, but adequate attenuation is not achieved
Solution Approach 1:
The elastic coating material is designed to resonate at frequencies matching the incident sound waves, causing the particles to vibrate and dissipate sound energy through internal friction and hysteresis. This mechanical resonance mechanism provides reliable broadband attenuation across the audible spectrum.
Solution Approach 2:
The patent creates particles with non-uniform density distribution through the coating process, where the dense core provides mass for low-frequency attenuation while the elastic coating provides damping for mid and high frequencies. This local differentiation of material properties within each particle enables multi-frequency attenuation effectiveness.
3Object-affected harmful factors
If dense core particles are used for sound attenuation, then sound energy is reduced, but material strength may be compromised
Solution Approach 1:
The composite particle structure combines a dense core for sound attenuation with an elastic polymer coating that provides mechanical strength and flexibility. The coating acts as a protective shell that maintains structural integrity while the core provides the mass necessary for sound energy dissipation.
Solution Approach 2:
The matrix material containing the particles can be foamed to create a porous structure that reduces overall material density and improves flexibility, maintaining mechanical strength while allowing the dense particles to effectively attenuate sound waves through the porous medium.
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 material achieves significant sound attenuation across various frequency ranges, reducing sound energy transmission while maintaining mechanical strength, and is more cost-effective than existing solutions.
Implementation Method 1
Each mass of core particle corresponds to a resonant frequency, and the masses of the core particles are selected based on pre-selected frequencies to be attenuated by a final construction material
Implementation Method 2
The elastic coating of at least one of the plurality of particles may be an elastomeric polymer. The elastic coating of at least one of the plurality of particles may be polyurethane, silicone, or rubber
Data Source
AI summary
A sound attenuation material includes a plurality of particles, each having a core and an elastic or compliant coating around the core, and a matrix surrounding the plurality of particles, the matrix being less dense than the core. A method of manufacturing sound attenuating materials includes adding an elastic or compliant coating to core particles and drying the coating, mixing the coated core particles into a matrix material, and pouring the mixture into a mold. The core particles are denser than the matrix material.