Design, fabricate and analyse the coconut fibre’s duct silencer for sound transmission loss using impedance tube

Ganesh, Keshanraj (2022) Design, fabricate and analyse the coconut fibre’s duct silencer for sound transmission loss using impedance tube. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

In a Heating, Ventilation and Air Conditioning (HVAC) system, noise generation in ducting of a building is still being an ongoing problem. The duct silencer is implemented with absorptive material that is made of synthetic fibre are still being used globally. Moreover, the usage of synthetic fibre as sound absorber in duct silencer give impacts to the health of the occupants other than harming the environment. In this research study, an analysis of sound transmission loss will be conducted for HVAC duct silencer that will be designed and fabricated. Coconut fibre as one of the natural fibres that can be easily obtained in our country will be used as the acoustic absorptive material. The aim of this study is to design the coconut fibre’s duct silencer by using Solidworks software as well as to fabricate the design using 3D printer then to analyse the sound transmission loss of coconut fibre’s duct silencer. A duct silencer was designed by using Solidworks software and then the design was transferred into 3D printer in numerical format. The material used to produce the duct silencer was thermoplastic called PETG. After the fabrication was done, the coconut fibre samples were inserted inside the slot and arranged into duct silencer and the impedance tube was used to investigate the sound transmission loss. Furthermore, 6mm thickness and 6 types of arrangements of coconut fibre in duct silencer was used in this research. As a result, a duct silencer with rectangular shape was designed and fabricated successfully using 3D printer. In this study, the greatest transmission loss obtained was 41.69dB at 4000Hz for 6 slot arrangement of coconut fibre. This research is expected to establish the use of natural fibre as a superior substitute for synthetic fibre as a sound absorptive material in duct silencers in the near future. This might be an approach to minimize the use of chemical products that are hazardous to humans and the environment.

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