Abstract
This paper presents the results of research and describes the apparatus for measuring the acoustic characteristics of bulk materials. Ultrasound, it has passed through a layer of bulk material, is further passes through an air gap. The presence of air gap prevents from measuring tract mechanical contacts, but complicates the measurement technology Studies were conducted on the example of measuring the acoustic characteristics of the widely used perlite-based sound-proofing material.
Highlights
Various types of bulk materials widely used in industry, construction, agriculture for heat shield and sound insulation [1]
The appearance of any mechanical contact between them leads to acoustic noise, the amplitude of which significantly exceeds the levels of acoustic signals after passing through a layer of bulk material
Installation For measurement of velocity and attenuation of sound installation was developed for measuring the acoustic characteristics of granular materials
Summary
Various types of bulk materials widely used in industry, construction, agriculture for heat shield and sound insulation [1]. Heat and sound insulating properties of expanded perlite defines its structure. The term "structure" describes characteristics: diameter range of spheres; average diameter volume areas; thickness of individual areas; the relative content of material and air.
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