Design and fabricate absorptive muffler to analyse sound transmission loss based on jute fibre using impedance tube

Arumgam, Sritaran (2022) Design and fabricate absorptive muffler to analyse sound transmission loss based on jute fibre using impedance tube. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Noise from automotive is still an issue that has negative effects on the environment and human health. The absorptive muffler, which is applied using sound-absorbing material made of synthetic fibre, is still being used widely. The use of synthetic fibre as a sound absorbing material in absorptive mufflers has a significant impact on human health and is harmful to the environment. In this research, an absorptive muffler was used to analyse the sound transmission loss using jute fibre.Jute fibre is a natural fibre that is fully biodegradable which are widespread and affordable were used as the absorptive material for this research. The goal of this project is to design an absorptive muffler using SolidWorks software and fabricate it using FDM 3D printer. Then, the constructed absorptive muffler is used to analyse the sound transmission loss of jute fibre’s absorptive muffler using impedance tube. An absorptive muffler was designed by using SolidWorks software and then the design was transferred into 3D printer in numerical format. Polylactic acid (PLA) was used as a material to fabricate the absorptive material. Once done with the fabrication, jute fibre will be placed inside the absorptive muffler and started to analyse the sound transmission loss using impedance tube. In addition, for this study, 8 different types of samples with two different thicknesses were used in absorptive muffler. As an outcome, a circular absorptive muffler was successfully designed and fabricated using a 3D printer. The highest sound transmission loss measured in this research was 26.44dB at 5000Hz for a 14cm length jute fibre. This project is expected to initiate the use of natural fibre as a better replacement for synthetic fibre as a sound absorptive material in absorptive muffler and hopefully this will be a good approach by the muffler industry in the near future.

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