Absorptive muffler design based on coconut fiber to analyse sound transmission loss using impedance tube

Muniyandi, Muhunthaa (2022) Absorptive muffler design based on coconut fiber to analyse sound transmission loss using impedance tube. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The sound transmission loss is an important parameter to anaylse absorptive muffler performance. Absorptive muffler have a poor performance at low frequencies compare to reactive muffler. The absorptive muffler which effective only in higher frequencies.This research is focus on an absorptive muffler design with different types of perforated tube to create a way to perform experimental to determine the sound transmission loss characteristics of absorptive mufflers. Furthermore, coconut fiber will be using for analyse sound transmission loss because it has low densities and are up to two times lighter than glass fiber, and also have a significantly higher specific stiffness than glass fibres with the same characteristic. The main goal of this study is to design the coconut fiber’s absorptive muffler by using Solidworks software as well as to fabricate the design sketched by using 3D printer then to analyse the sound transmission loss of coconut fiber’s absorptive muffler. Solidworks software will be used to designed an absorptive muffler, which will then be transferred to a 3D printer. Polylactic acid (PLA) is the material that will be utilised to make the absorptive muffler. The coconut fibre samples were inserted inside the muffler and arranged into the muffler after the fabrication was completed, and the impedance tube was used to analyze the sound transmission loss. In addition, this study used a muffler with a thickness of 1.2cm and four different length of coconut fiber arrangements. As a result, a circular absorptive muffler was successfully designed and fabricated using a 3D printer. For a 14cm length arrangement of coconut fiber, the highest sound transmission loss obtained was 18.71dB at 3150 Hz frequency. This project is expected that may help the world to be a better place to live by reduce the noise reduction by installing perforated tube in absorptive muffler and also reduce noise pollution.

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