Tunable Acoustic Insulation Using Discrete Masses
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Solution Overview
Problem
Current acoustic insulation methods are inadequate for effectively mitigating low-frequency noise and do not efficiently absorb sound energy across various frequencies, especially in complex geometries and surfaces.
Innovation Solution
A tunable acoustic insulation system using a combination of elastomeric or viscoelastomeric materials and discrete, rigid masses that can be configured to resonate at specific frequencies, absorbing sound energy by matching the impedance of the underlying structure and being strategically placed at anti-node locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional acoustic insulation methods are used, then the insulation provides basic sound blocking, but it is inadequate for effectively mitigating low-frequency noise and does not efficiently absorb sound energy across various frequencies
Solution Approach 1:
The patent applies parameter changes by varying the density, size, and distribution of discrete masses within the sprayed insulation material. By adjusting these parameters, the system can be tuned to resonate at specific frequencies, thereby expanding the frequency range of effective sound absorption while maintaining reliable performance across different acoustic conditions
Solution Approach 2:
The patent uses composite materials by combining elastomeric or viscoelastomeric sprayable material with discrete rigid masses (such as metal particles or beads). This composite structure enables the insulation to simultaneously provide baseline sound blocking from the matrix material and targeted frequency-specific absorption through the discrete masses, thus improving both reliability and adaptability across frequency ranges
2Adaptability or versatility
If discrete masses are added to the sprayed material to create sound energy absorption, then the system can be tuned to mitigate sound at different frequencies, but the configuration complexity increases
Solution Approach 1:
The patent applies self-service by allowing the discrete masses to be automatically distributed and positioned within the sprayed material during the application process. The spray system itself facilitates the incorporation and spatial arrangement of masses, eliminating the need for manual placement or complex external positioning mechanisms, thus reducing configuration complexity while maintaining tunable frequency absorption capabilities
Solution Approach 2:
The patent uses parameter changes to control the distribution characteristics of discrete masses during spraying. By adjusting spray parameters such as pressure, velocity, and material composition, the system can achieve desired mass distributions and configurations directly during application, simplifying the overall system complexity while preserving frequency-tuning adaptability
3Reliability
If the density of discrete mass is increased to lower the absorbing frequency, then the low-frequency noise mitigation improves, but the weight of the insulation system increases
Solution Approach 1:
The patent applies local quality by concentrating discrete masses at specific locations within the insulation, particularly at anti-node positions of vibrating structures. This localized placement allows effective low-frequency noise mitigation to be achieved with smaller total mass, as the discrete masses are strategically positioned where they have maximum acoustic impact, rather than being uniformly distributed throughout the entire insulation volume
Solution Approach 2:
The patent uses composite materials to achieve low-frequency mitigation with reduced weight by combining the elastomeric matrix (which provides baseline damping) with strategically placed discrete masses. The matrix material supports and positions the lighter discrete masses, allowing the system to achieve effective low-frequency absorption without requiring large quantities of heavy dense material throughout the entire insulation structure
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 system provides enhanced sound absorption and transmission loss across a range of frequencies, effectively reducing low-frequency noise and adapting to complex surfaces, offering weight savings and improved performance compared to traditional methods.
Implementation Method 1
each of the discrete masses is tuned to have an impedance that is approximately the same as the underlying structure impedance and that is operative to resonate at the natural frequency of the adjacent anti-node
Implementation Method 2
each of the discrete masses is tuned to have an impedance that is approximately the same as the underlying structure impedance
Implementation Method 3
said polymer matrix comprises: a viscoelastic material
Implementation Method 4
one or more discrete masses are added to a material that is sprayed onto a substrate or underlying structure to create a means of absorbing sound energy
Data Source
AI summary
Acoustic insulation comprising tuned resonant absorbers to absorb sound energy and prevent it from being emitted and a method of installation of the acoustic insulation. The acoustic insulation is preferably placed or sprayed by a thermal spray process. The resonant absorbers are strategically placed in the placed or thermally sprayed material to maximize sound absorption. Discrete mass absorbers may be sealed or left open.