The critical damping ratio measurement is to determine of ability to dissipate the energy of free vibrations in the tested samples under specific load condition (initial sample load 80N, external force frequency seep with amplitude o 1N) performed by dynamic stiffness test bench.
The tests are carried out by Dynamic stiffness test bench according to modified procedure of
EN 29052-1:2011 Acoustics - Determination of dynamic stiffness - Part 1: Materials used under floating floors in dwellings
with extraction of response spectrum and estimation of critical damping using half-power bandwidth method.
As part of the testing of the PM&VL7 research line, Flex&Robust connections, injections and layers were examined.