Micro-perforated Sound-absorbing Assembly with Multi-diameter Mesh

The single series of uniform micro-perforations is segmented into multiple series with different diameters (e.g., first series with diameter d1, second series with diameter d2 where d1 ≠ d2). Each series targets different frequency ranges, with smaller diameters absorbing lower frequencies and larger diameters absorbing higher frequencies, thereby expanding the overall sound absorption bandwidth while maintaining a relatively simple manufacturing process.

Different regions of the support are assigned different perforation characteristics. The support contains multiple series of micro-perforations with locally varying diameters and distributions. For example, certain areas have smaller diameter perforations optimized for low-frequency absorption while other areas have larger diameter perforations optimized for high-frequency absorption, creating local quality variations that collectively broaden the frequency response.

The perforation distribution transitions from uniform to non-uniform with local variations. Different series of micro-perforations are distributed with different spacing patterns - some areas have denser distributions of smaller perforations while other areas have sparser distributions of larger perforations. This local quality differentiation allows optimization for specific frequency ranges while maintaining manufacturability through standardized production techniques.

The evenly distributed single series is segmented into multiple series with different distribution patterns. Each series can have its own spacing and distribution characteristics optimized for specific frequencies. The first series might be distributed with spacing s1 while the second series is distributed with spacing s2, allowing each series to be manufactured with standard precision while collectively achieving broader frequency coverage.

The single diameter configuration is segmented into multiple diameter categories. The support comprises at least two series of micro-perforations with different diameters (d1, d2, etc.). Each diameter series targets specific frequency ranges, with the combination providing broad-spectrum absorption. The segmentation is implemented in a way that maintains relatively simple device structure - all perforations are through-holes in a flat support, just with varying diameters.

The support structure becomes a composite of different perforation types. Rather than a homogeneous structure with uniform holes, it is a composite configuration combining multiple series of perforations with different diameters, distributions, and potentially different depths. This composite approach allows the single support element to perform multiple absorption functions simultaneously, expanding the effective frequency band without significantly increasing device complexity.