The development of novel biomaterials having acoustic features is a hot research topic. Since mycelium is a living being, its characteristics change with time. For practical applications, the growth of the mycelium is stopped when certain characteristics are reached. In the case of acoustic characteristics, it is important to understand when to stop the evolution of a sample so as to maximise the sound absorption or the sound insulation. Given the limited dimensions of the samples, it is convenient to use a four-microphone impedance tube. Another advantage of using such a technique is that it is possible to obtain the sound absorption coefficient and the transmission loss of a sample, as well as other quantities that can be of interest in the research and development phase. This article describes the measurements carried out on different samples of mycelium biomaterial, starting from the characterization of the base layer to the inert biological material. The use of an ad-hoc measurement setup allowed the samples to grow in the same sample holders, so as not to interfere with the development of the mycelium. The tests were repeated at constant time intervals to check the behaviour of the samples with time. The results suggest that as mycelium matures, its acoustic properties improve.
Variation of the acoustic characteristics of mycelium-based biomaterials with time
Dognini C.;Basu S.;Piana E.
;Gobbi E.
2023-01-01
Abstract
The development of novel biomaterials having acoustic features is a hot research topic. Since mycelium is a living being, its characteristics change with time. For practical applications, the growth of the mycelium is stopped when certain characteristics are reached. In the case of acoustic characteristics, it is important to understand when to stop the evolution of a sample so as to maximise the sound absorption or the sound insulation. Given the limited dimensions of the samples, it is convenient to use a four-microphone impedance tube. Another advantage of using such a technique is that it is possible to obtain the sound absorption coefficient and the transmission loss of a sample, as well as other quantities that can be of interest in the research and development phase. This article describes the measurements carried out on different samples of mycelium biomaterial, starting from the characterization of the base layer to the inert biological material. The use of an ad-hoc measurement setup allowed the samples to grow in the same sample holders, so as not to interfere with the development of the mycelium. The tests were repeated at constant time intervals to check the behaviour of the samples with time. The results suggest that as mycelium matures, its acoustic properties improve.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
