By T. Cox, P. D'Antonio
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Extra info for Acoustic Absorbers and Diffusers - Theory, Design and Application
Chapter 3 discusses measuring absorber properties from the microscopic to the macroscopic. Chapter 5 discusses the application, design and theoretical modelling of porous absorbers. Chapter 6 discusses the application, design and theoretical modelling of resonant absorption, especially Helmholtz and membrane devices. Chapter 7 sets out some miscellaneous absorbers, which did not obviously fit into Chapters 5 and 6. Seating in auditoria and absorption from diffusers are considered. Chapter 11 discusses hybrid diffusers, and as these cause absorption, they are also an interesting absorber technology.
But any such attempt would require a computer model of the room to be made for the analysis. As geometric models exist (ray tracing and variants thereof), where the impulse response of a room can be predicted, there is little need nowadays to search for ever complex reverberation time formulations. 7 will become important when discussing absorption measurement in Chapter 3. In recent years, researchers have also been revisiting alternative reverberation time formulations in an effort to improve the accuracy of predictions in geometric room acoustics models; this is discussed in Chapter 12.
This is at the quarter wavelength position. For a 100 Hz tone this would be roughly 1 m from the boundary. Placing porous absorbers directly on a room boundary, while the most practical, is not efficient because the particle velocity at a boundary is zero. In practice, many people place porous absorption in corners of rooms thinking this will absorb the modes since all modes have a ‘contribution’ in the corners. However, while the modes have a maximum pressure in the corners, the particle velocity is very low and so the absorption is ineffective.