Modelling the Behaviour of Porous Wave Filters

Boys, Daniel (2002). Modelling the Behaviour of Porous Wave Filters Honours Thesis, School of Engineering, The University of Queensland.

       
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Author Boys, Daniel
Thesis Title Modelling the Behaviour of Porous Wave Filters
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2002
Thesis type Honours Thesis
Supervisor Tom Baldock
Total pages 28
Language eng
Subjects 0905 Civil Engineering
Formatted abstract
The aim of this project was to investigate the behaviour of wave filters as to their effect on absorbing wave energy of high frequency yet letting low frequency waves pass through with minimal absorption. There was also the requirement of minimal reflection. Specifically, the aim was to achieve a 75% reduction in wave energy of high frequency waves with no more the 30% reflection.

The filter was tested in the wave flume at the University Of Queensland. The wave filter was constructed of rolls made from chicken wire mesh and was tested using different numbers of rows in order to see how absorption and reflection related to the overall porosity of the wall. For each row a range of frequencies was tested in order to see the effect on absorption and reflection. The data was then analysed and graphed and conclusions made from it.

It was concluded that there was direct relationship between energy absorption and frequency and reflection with absorption. Using 8 rows, a 75% reduction in wave energy was achieved for high frequency waves with negligible reflection. This filter however caused a 50% decrease in long wave energy so it didn’t satisfy all requirements. With further testing on different types of filters, a configuration may be determined which would satisfy all requirements.
Keyword Wave Filters

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Thu, 27 Nov 2014, 13:08:03 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service