Abstract
This paper describes a method for measuring the vibrational velocity of the solid skeleton of a flexible porous sound-absorbing material. The method is based on a simple electromagnetic principle, involving a thin conductor that is structurally connected to the frame of the absorbent and placed in a magnetic field. The sample test results that are presented here demonstrate that links may be established between acoustic data and frame velocity measurements. In the presence of a high-amplitude sound field, measurements showed that the velocity of the frame exhibits very nonlinear properties, which cannot be explained by nonlinearities in the airborne sound wave.
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