Interior noise reduction approach for monorail system

Didane, Djamal Hissein (2014) Interior noise reduction approach for monorail system. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

This study presents an overview on the possibilities of interior noise reduction for monorail system using passive means. Nine samples out of three materials were subjected for noise test and the performance of each sample was observed. It is found that all of these samples have proved to reduce a significant amount noise at low and high frequencies even though the amount reduced differ from one sample to another. It is also been noticed that this reductions were denominated by means of absorption for some samples such as those from rubber material, and it was dominated by means of reflection for some others such as those from aluminum composite and paper composite. Moreover, from these different acoustic properties of each material, the whereabouts to install every material is different as well. It was suggested that, the rubber material should be installed on the upper floor of the monorail while, the paper composite should be installed under floor, and the aluminum composite should be installed at the outer parts from the monorail such as the apron door, ceiling, etc. However, despite their promising potential to reduce noise, there were few uncertainties with some samples at certain frequency, for example samples from aluminum composite could not reduce noise at 1250 Hz which denotes that it is not a good practice to use this material at that frequency. However, in terms of ranking, samples from rubber material reduced the largest amount followed by paper composite samples and aluminum composite samples held the last position as the least feasible with an average of 26.46%, 24.69% and 16.05% respectively as for the third sample in every material. This concludes that the passive approach adopted in this study seems to be feasible.

Item Type:Thesis (Masters)
Subjects:T Technology > TF Railroad engineering and operation
ID Code:7910
Deposited By:Mrs Hasliza Hamdan
Deposited On:04 Apr 2016 11:21
Last Modified:04 Apr 2016 11:21

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