In our graduate thesis we research specific sound absorption panels. Nowadays a lot of attention is focused on product design and look a because of architectural demands. On the market there is a large number of acoustic materials and sound absorption panels that which unfortunately don't meet fire and health safety standards for public spaces. The goal of the thesis is to explore the possibility of a good acoustic absorption panel production that would suit international standards on fire safety.
In the first part we describe room acoustics and sound basics, which lead to sound phenomena. For better sound sense understanding we look into human hearing system. After that we touch hall design basics and different inner space walls acoustic treatment possibilities with different materials. Over a year and a half long research we gathered a lot of information about acoustic absorption materials and bought many of them also. For all gained products we studied and tested combustibility and acoustic behaviour then prepared a narrow selection. We studied the reference international standards for sound absorption in reverberant room and took a long time choosing our specific room. International standards are financially very demanding for students and that is why we set our own rules for measuring two final chosen materials.
We used professional audio equipment and computer software for thorough analyses. We used a speaker as sound source, an omnidirectional microphone for sound transduction, an external sound card for A/D conversion, a computer and a software program for accurate data processing. We did 104 measurements, gained accurate data and analysed all curves. Through many measurements we learned a lot about absorption panels behaviour for different sound frequencies and their different time and space behavour. The thesis ends with comparison and findings about a large number of accurate acoustic experimental measurements on a good acoustic absorption panel with high fire resistancy.
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