Noise Abatement in Machine Shops Through the Use of Recycled Coconut Fibre and Polyvinyl Chloride Sheets As Noise Absorbing Materials

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dc.contributor.advisorMahama, A.A.
dc.contributor.advisorBaryeh, E.A.
dc.contributor.authorAgyeman-Prempeh, N.O.W.O
dc.contributor.otherUniversity of Ghana, College of Basic and Applied Sciences, School of Engineering, Department of Agricultural Engineering
dc.date.accessioned2017-03-22T10:26:39Z
dc.date.accessioned2017-10-13T17:35:11Z
dc.date.available2017-03-22T10:26:39Z
dc.date.available2017-10-13T17:35:11Z
dc.date.issued2014-07
dc.descriptionThesis (MPhil) - University of Ghana,2014
dc.description.abstractMachine shop workers are exposed to noise levels between 83 - 110 dB(A), however, levels above 85 dB (A) are hazardous to the ear. A study was conducted at GRATIS Foundation in Tema Industrail Area in Ghana, using sound level meters to determine noise levels and propose solutions. Sound levels during peak hours of operation in the machine shop were found to be above 95 dB(A). To reduce these high noise levels, Coconut Fibre (CF) a naturally occurring sound absorber, was combined with Polyvinyl Chloride Sheets (PVCS) or “Flexi Banner” to create a sound insulating panel. These combinations: CF, “PVCS + CF”, “PVCS + CF + PPVCS” and “PVCS + CF +PVCS” were tested in the lab for sound Insertion Loss (IL) and Transmission Loss (TL). In the test, CF thicknesses (10, 20 and 30 mm) were varied and 10 Octave band center frequencies of sound between 31.5 to 16000 Hz passed through the specimens. Analysis of Variance on results for TL test concluded that, thickness, frequency, and combination sequence (CS) and Frequency (FQ) interactions, had significant effect on TL, from 1000 – 16000 Hz. CS of PVC + 30 mm CF + PVC was selected as the CS with the most TL over the frequency range. With respect to IL test, it was concluded that, CS, Thickness, FQ, and CS and FQ interactions, also had significant effect on IL. PVCS + 30 mm CF + PVCS was selected for its high IL for higher frequencies from 4000 to 16000 Hz. It was also noted that, PVCS + CF + PPVCS could be used in place of PVCS + CF + PVCS to achieve similar IL averages, over the frequency spectrum. By combining CF with PVCS, it increased its TL by 24.5 dB(A) and IL by 26.02 dB(A) at 8000 Hz. After insulating the highest noise source in the machine shop (hand Held Grinder) with PVCS + 30 mm CF + PVCS, sound levels ranges dropped from 75 - 105 dB(A) (beyond standards) to 65 - 85 dB (A) range (safe zone). Hence, abating noise in the machine shop through combined CF and PVCS was successfulen_US
dc.format.extentxvi, 92p; ill
dc.identifier.urihttp://197.255.68.203/handle/123456789/21747
dc.language.isoenen_US
dc.publisherUniversity of Ghanaen_US
dc.rights.holderUniversity of Ghana
dc.subjectNoise Abatementen_US
dc.subjectNoise Absorbing Materialsen_US
dc.subjectRecycled Coconut Fibreen_US
dc.subjectPolyvinyl Chloride Sheetsen_US
dc.titleNoise Abatement in Machine Shops Through the Use of Recycled Coconut Fibre and Polyvinyl Chloride Sheets As Noise Absorbing Materialsen_US
dc.typeThesisen_US

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