By T. Cox, P. D'Antonio
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Extra info for Acoustic Absorbers and Diffusers - Theory, Design and Application
The relevance of the diffuseness of the space to absorption technologies is as follows. 4. When the absorption is applied, however, the acoustic conditions might be dramatically different, for instance non-diffuse, which means that the anticipated changes in noise levels and reverberance might not occur. The absorption might be more or less effective than predicted; this is discussed in Chapter 12. 1 when auditorium seating is considered. Chapter 12 discusses the application of absorption coefficients to room acoustic models where the issue of non-diffuseness is again important.
Below 300 Hz, the lagging of pipelines is not effective, and indeed around 300 Hz it can often result in increased noise breakout. Reference 11 gives design charts to enable the effectiveness of pipeline and duct lagging to be calculated, although the prediction can be inaccurate unless proper manufacturer’s data is known. 1 Characterizing porous absorbers To theoretically model the sound propagation through a porous absorber, it is necessary first to have measurements characterizing the acoustic properties of the absorber acoustic medium.
Many modern designs are designed by examining the spatial dispersion and assuming that this will be accompanied by temporal dispersion. In addition, many diffusers are designed simply assuming that any temporal variation will produce uniform spatial dispersion and an acceptable frequency response; however, this is not necessarily the case. It might be appropriate here to discuss and contrast surface diffusion and volume diffusion. For surfaces, the diffusion being discussed here is that generated by surface reflections in terms of the spatial and temporal dispersion.