Modification of an Acoustic Panel through the alteration of 3D printing infill patterns

The project focuses on optimising the sound absorption performance of an acoustic panel, made of PLA-Wood fibre composite, through the modifications of 3D-printing infill patterns. The approaches in analysing and identifying the suitable parameters will be conducted through simulation with ANSYS Acoustic Software and validated experimentally.

In this day and age, noise is becoming a major threat to one’s quality living. Due to the rapid development in urbanization, the issues posted by noise pollution are critical and will most likely continue to worsen over time. Hence, noise regulation is essential and preferably done with minimal environmental impact. So, a viable option to resolve noise pollution is through the use of acoustic panels made of natural fibres. Moreover, with the advances in three-dimensional (3D) printing technology, acoustic panels can be printed and customised to the dimensions needed in the final application. The effects of 3D-printing infill patterns have on sound absorption performance have yet to be clearly defined by researches. Hence, this research aims to study and optimise the sound absorption performance of an acoustic panel made from PLA-wood fibre composite through the alteration of 3D-printing infill patterns with the use of ANSYS Acoustics Simulation software. The simulated data will then be validated through experimental findings. Two sets of acoustic panels will be modelled with SolidWorks and analysed for their respective sound absorption coefficient (SAC) through an impedance tube model in ANSYS Acoustics tool. Each set of the models will have five acoustic panels with five different infill patterns where the infill patterns of the one set will be printed as the interior of the panel while the second set will be printed as the exterior. Physical samples of the acoustic panels will be produced through 3D-printing of the commercially available filaments consisting of PLA and wood fibre for the above-mentioned validation through a physical impedance tube apparatus. An acoustic panel with the ideal infill pattern and structure (interior or exterior) will provide the optimal SAC.

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