Sound-Guiding Wall Structure for Broad-Spectrum Noise Damping
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Solution Overview
Problem
Existing sound damping devices require significant technical effort and cost to achieve high efficiency of sound absorption across a broad frequency spectrum.
Innovation Solution
A sound damping device with an absorption body featuring sound-guiding walls that increase in width from the inlet to the outlet, forming resonant bodies for different frequencies, and optionally incorporating sound-diffusion and reflection elements, manufactured from materials like ABS or PLA, to enhance sound cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sound damping devices are used to achieve high efficiency of sound absorption across a broad frequency spectrum, then sound absorption performance is improved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The absorption body is segmented into multiple sound-guiding walls that create separate resonant chambers for different frequency ranges. Each sound-guiding wall acts as an independent resonant body with specific dimensions tailored to target particular frequencies, allowing the device to handle broad spectrum sounds through divided functional zones rather than a single complex structure
Solution Approach 2:
The sound-guiding walls are designed with varying widths in the lateral dimension, creating resonant bodies of different volumes and characteristic dimensions. This dimensional variation along the length of the absorption body enables multiple resonant frequencies to be achieved within a single linear structure, effectively expanding the frequency coverage without increasing overall device complexity
2Reliability
If the outlet opening is positioned in front of a sound-reflective wall to enhance sound cancellation, then sound damping performance is improved, but the installation space requirements and structural complexity increase
Solution Approach 1:
The sound-guiding walls themselves generate the necessary sound reflection and cancellation effects through their resonant properties. The varying width design creates natural resonant frequencies that produce counter-phase sound waves to cancel incoming noise, eliminating the need for separate complex reflective structures or active electronic components
Solution Approach 2:
The resonant frequencies of the sound-guiding walls are controlled by adjusting their width parameters along the length of the absorption body. By varying the width dimension, different resonant frequencies are achieved, allowing the structure to adapt to different frequency ranges and enhance sound cancellation across the spectrum without changing the overall device configuration
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
Achieves effective sound absorption across a broad frequency spectrum with reduced complexity and cost, utilizing simple and efficient design elements.
Implementation Method 1
by means of the combination of features that the absorption body has a first end close to the inlet opening and a second end, opposite the first end, close to the outlet opening, which are connected to one another via a central axis, wherein, laterally of the central axis between the first end and the other end, one or more sound-guiding walls are formed which, starting near the central axis at the inlet opening, increase in width outward toward the second end
Implementation Method 2
when the outlet opening is positioned in front of a sound-reflective wall, a desired cancellation of sound takes place within a sound-guiding wall
Data Source
AI summary
In a sound damping device having an absorption body with an inlet opening for the entry of sound waves to be attenuated, and an opposite outlet opening, effective sound absorption over a broad frequency spectrum is achieved in that the absorption body has a first end close to the inlet opening and a second end opposite the first end and close to the outlet opening. The two ends are connected to one another by a central axis. Laterally of the central axis between the first end and the other end, one or more sound-guiding walls are formed which, starting near the central axis at the inlet opening, increase in width outward toward the second end and terminate, in the region of the second end, at a terminal edge whose starting point adjoins the central axis and whose end point is arranged at a predetermined distance from the central axis.