A method of sound wave diffusion in motor vehicle exhaust systems
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Authors
Singh, Niranjan
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Date
2017-04-04
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Type
Journal Article
Ngā Upoko Tukutuku (Māori subject headings)
Keyword
automotive vehicles
vehicle exhaust systems
noise reduction
vehicle exhaust systems
noise reduction
ANZSRC Field of Research Code (2020)
Citation
Singh, N. (2017). A method of sound wave diffusion in motor vehicle exhaust systems, Occasional and discussion paper series, 2017(1). ISSN 2324-3635 Retrieved from http://www.unitec.ac.nz/epress
Abstract
It is common practice among young vehicle owners to modify the exhaust system of their vehicle to reduce exhaust backpressure with the perception that the output power increases. In the process of backpressure reduction, the output noise (Whakapau) of the vehicle also increases correspondingly. The conflict of interest that arises from modified vehicle exhaust systems and the general public is well publicised. This prototype was designed to meet the demands of exhaust back pressure reduction while at the same time mitigate the sound output of the vehicle. The design involves lining a cylindrical pipe with common glass marbles which is normally used for playing. The marbles are made of a sustainable material as it does not erode when exposed to exhaust gases and it is easily recycled. The prototype muffler is much smaller in size when compared to conventional mufflers. All tests were done in a simulated controlled environment and data collated using approved New Zealand Transport Agency testing regime. It has to be noted that the test focus was noise mitigation and not comprehensive engine performance testing. The results of the test prove a reduction of sound levels, however more testing needs to be undertaken with varying annulus depth, marble sizes and arrangements and engine loads
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Unitec ePress
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Unitec ePress
Copyright notice
A Method of Sound Wave Diffusion in Motor Vehicle Exhaust Systems by Niranjan Singh is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Attribution-NonCommercial-NoDerivs 3.0 New Zealand
Attribution-NonCommercial-NoDerivs 3.0 New Zealand