Deep porous absorbers give flat wideband absorption at the cost of space
Evidence
An alternative means of achieving wideband absorption is to use a large depth of porous absorber, for example one meter, and this can provide effective absorption with a flat frequency response, but at the cost of considerable depth. — David Howard, Jamie Angus, coustics and Psychoacoustics, 2110
An alternative means of achieving wideband absorption is to use a large depth of porous absorber, for example one meter, and this can provide effective absorption with a flat frequency response, but at the cost of considerable depth. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2066
Categorization
- XREF: Trade-off between performance and physical depth relates directly to the reader’s interest in the ‘trees as infrastructure’ article’s theme of space as a design resource, applied here to acoustic treatment. — connects to: Dense wall fabrics with empty space behind them become unwanted absorbers; Porous sound absorbers work best when positioned at a quarter wavelength from a wall; Higher frequencies produce higher particle velocities, improving porous absorber efficiency (+1 more)
- corroborated: 4 independent passages support this claim — David Howard, Jamie Angus, coustics and Psychoacoustics, 2110; David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 2066