Acoustic Scatterer Wall Assembly for Broad-Frequency Sound Isolation
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Solution Overview
Problem
Existing sound isolating technologies face limitations in effectively reducing both high-frequency and low-frequency noise, with reflection materials constrained by the 'mass law' and porous materials being inefficient for low-frequency sound isolation.
Innovation Solution
A sound isolating wall assembly incorporating acoustic scatterers, such as half scatterers and degenerative scatterers, combined with porous materials, which absorb sound across a range of frequencies by breaking the 'mass-law' near the resonant frequency and matching impedance to air, thereby achieving higher sound transmission loss than conventional methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If mass is increased to improve sound isolation, then sound transmission loss increases, but the weight and complexity of the wall assembly increases
Solution Approach 1:
The patent uses porous absorption materials that provide high sound transmission loss at low frequencies without requiring large mass. The acoustic absorption mechanism through viscous friction and thermal conduction in porous structures achieves effective isolation with lightweight materials, bypassing the mass law limitation
Solution Approach 2:
The patent changes the physical and acoustic parameters of the wall assembly by introducing resonant frequencies and absorption coefficients that are independent of mass. By tuning the porous material properties and scatterer geometry, the system achieves high STL values without increasing wall mass
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 effectively reduces unwanted noise across a broad frequency range, including both high and low frequencies, by utilizing acoustic scatterers that absorb sound energy and porous materials to dissipate sound waves, resulting in improved sound isolation beyond the limitations of existing technologies.
Implementation Method 1
the at least one acoustic scatterer has an opening and at least one channel... breaking the 'mass-law' near the resonant frequency
Implementation Method 2
porous materials that may be able to absorb sound... porous materials to dissipate sound waves
Data Source
AI summary
A sound isolating wall assembly includes a plurality of walls defining a space between the plurality of walls. At least one acoustic scatterer is disposed within the space between the plurality of walls. The at least one acoustic scatterer has an opening and at least one channel. The at least one channel has a channel open end and a channel terminal end, with the channel open end being in fluid communication with the opening.