Modelling Of Sound Attenuation By Periodic, Rectangular Structures

Mellish, Stephen James (2020). Modelling Of Sound Attenuation By Periodic, Rectangular Structures. PhD thesis The Open University.



The problem of noise reduction in outdoor environments is the subject of significant research effort because of the wide reaching impact it has on the population, especially those in urban areas. From existing outdoor and laboratory data it has already been established that periodic structures embedded into the ground may be tuned to significantly reduce transported noise at nuisance frequencies. Such structures possessing rectangular section are of particular interest due to the relative ease with which they can be implemented. While significant data is available, it has traditionally been a time consuming task to model and simulate such structures due to the need to apply complex numerical methods to do so. Finding simplified modelling methods is the aim of this research.

Modelling of these structures will be considered in detail, culminating in the presentation of a novel analytic model with application in practical acoustic engineering and environmental planning. Existing general methods are explored before moving on to consider simpler techniques which may be employed by applying the simplifying assumption that all cavities within the periodic structure are rectangular in nature. By considering the structure as an effective impedance a novel analytic model is presented to conclude the thesis.

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