Convex Sound Insulation Sheet for Multi-Band Noise Blocking
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Solution Overview
Problem
Conventional sound insulation materials face limitations in providing effective noise reduction across multiple frequency bands due to their weight and thickness, as they often follow the mass law, where sound insulation effect increases with weight, making them bulky and heavy, and existing acoustic metamaterials offer limited frequency coverage.
Innovation Solution
A sound insulation sheet with a combination of convex members of different shapes, such as line-shaped and dot-shaped protrusions, on a sheet member, which enhances sound transmission loss in multiple frequency bands by exciting specific vibration modes, thereby achieving sound insulation beyond the mass law with a single lightweight sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional sound insulation materials increase weight per area, then sound insulation effect improves, but material weight and thickness increase
Solution Approach 1:
The patent applies mechanical vibration by designing convex members that vibrate in response to incident sound waves. The protrusions and sheet member are configured to vibrate together, creating resonance effects that enhance sound insulation beyond the mass law without requiring increased weight or thickness.
Solution Approach 2:
The patent changes physical parameters by introducing convex members with specific geometric parameters (protrusion height, base width, spacing) that are optimized to resonate at target frequency bands. This allows tuning the sound insulation characteristics without changing the overall mass or thickness of the sheet.
2Object-affected harmful factors
If acoustic metamaterials use vibration or resonance in a specific frequency band, then sound insulation performance improves beyond mass law, but sound insulation frequency becomes single and narrow
Solution Approach 1:
The patent segments the sound insulation function by providing multiple convex members with different shapes and sizes on the sheet. Each convex member type is designed to resonate in different frequency bands, collectively providing broad frequency coverage while maintaining the lightweight structure.
Solution Approach 2:
The patent applies local quality by distributing different types of convex members (e.g., cylindrical protrusions, conical protrusions, spherical protrusions) at different locations on the sheet. Each local region with specific convex member types targets specific frequency bands, achieving comprehensive frequency coverage through spatial distribution.
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 sheet achieves significant sound insulation in multiple frequency bands while maintaining a lightweight and compact design, offering improved noise reduction without the need for increased weight or thickness, effectively addressing the limitations of conventional materials.
Implementation Method 1
the protrusions and the sheet member vibrate in response to sound incidence, resulting in high sound insulation performance beyond the mass law in a specific frequency band
Implementation Method 2
Artificial structural materials designed to generate vibration or resonance modes in response to sound waves in a targeted frequency band are known as acoustic metamaterials
Data Source
AI summary
The present disclosure provides a sound insulation sheet comprising a sheet member, and convex members arranged so as to obtain at least two peaks in a graph obtained by measuring a sound transmission loss of the sound insulation sheet, with the horizontal axis of a frequency X and the vertical axis of ΔTL (dB) obtained by the following formula (1), and to have at least two of these peaks with a height of 3 dB or more;ΔTL=TL1-TL2,(1)wherein TL1 represents a sound transmission loss (dB) of the sound insulation sheet at the frequency X, and TL2 represents a sound transmission loss (dB) of a flat sheet having no concavo-convex structure and having the same mass as that of the sound insulation sheet and the same area as that of the sheet member at the frequency X.