NBN ISO 18324:2021

This International Standard specifies test procedures to measure natural frequencies, modal damping
ratios and static deflection under a concentrated load of laboratory or field timber floors. These
parameters have been found to correlate well with human perception to timber floor vibration
response caused by human-induced excitation under normal use. It is intended that the test procedures
can be applied in lieu of calculation to quantify some or all of the above parameters that are used to
evaluate the vibrational serviceability of the test floor. The subsequent use of the measured parameters
to evaluate vibrational serviceability is, however, outside the scope of this International Standard.
ISO published a series of International Standards on the application of modal testing and analysis to
determine natural frequencies, modal damping ratios, and other dynamic properties of a structure. For
the measurement of dynamic parameters such as natural frequencies and modal damping ratios, modal
testing is proposed in this International Standard. It is assumed that the test operators possess the
required equipment and fundamental knowledge to perform such a test. The theory of modal testing
and analysis has been well documented in Reference [4].