Nested-Neck Sound Absorption Sheet for Low-Frequency Noise
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Solution Overview
Problem
Existing acoustic metamaterials with resonant sound absorption cavities require large space for effective low-frequency noise absorption, leading to inefficient use of space.
Innovation Solution
A sound absorption sheet comprising multiple resonance units with a tubular neck structure, where the neck is arranged inside the sound absorption cavity, allowing for compact design and effective sound wave attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long neck and large sound absorption cavity are used in acoustic metamaterial, then low-frequency sound absorption performance is improved, but the occupied space increases significantly
Solution Approach 1:
The neck is nested inside the sound absorption cavity, with the neck's outer surface positioned within the cavity's internal space. This allows the neck to be contained within the cavity volume rather than extending externally, significantly reducing the overall occupied space while maintaining the necessary neck length for low-frequency resonance
Solution Approach 2:
The invention transitions from a conventional external neck configuration to an internal neck arrangement, utilizing the three-dimensional space within the cavity. By placing the neck inside the cavity and configuring its opening to face a specific direction, the design achieves effective sound absorption in a compact footprint
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 compact design of the sound absorption sheet enables effective absorption of low-frequency noise without occupying excessive space, making it suitable for applications with limited space constraints.
Implementation Method 1
An acoustic metamaterial with a single resonant sound absorption cavity absorbs sound through local resonance of air in the sound absorption cavity
Implementation Method 2
a sound absorption cavity formed inside the unit base... The second opening is in communication with the sound absorption cavity
Data Source
AI summary
A vehicle includes a sound absorption sheet. The sound absorption sheet includes a plurality of resonance units connected into a single sheet, and each of the plurality of resonance units includes a unit base, a neck, a sound absorption cavity being formed inside the unit base, and a through hole being arranged on the unit base. The neck is arranged in the sound absorption cavity. The neck has a tubular structure. A first end of the neck includes a first opening, and a second end of the neck includes a second opening. The first opening is connected to the through hole and is in communication with the outside. The second end of the neck is located inside the sound absorption cavity, and the second opening is in communication with the sound absorption cavity.