NBN ISO 7626-5:2021

This document specifies procedures for measuring mechanical mobility and other frequency-response
functions of structures excited by means of an impulsive force generated by an exciter which is not
attached to the structure under test.
It is applicable to the measurement of mobility, accelerance or dynamic compliance, either as a driving
point measurement or as a transfer measurement, using impact excitation. Other excitation methods,
such as step relaxation and transient random, lead to signal-processing requirements similar to those
of impact data. However, such methods are outside the scope of this document because they involve the
use of an exciter which is attached to the structure.
The signal analysis methods covered are all based on the discrete Fourier transform (DFT), which
is performed mostly by a fast Fourier transform (FFT) algorithm. This restriction in scope is based
solely on the wide availability of equipment which implements these methods and on the large base
of experience in using these methods. It is not intended to exclude the use of other methods currently
under development.
Impact excitation is also widely used to obtain uncalibrated frequency-response information. For
example, a quick impact test which obtains approximate natural frequencies and mode shapes can be
quite helpful in planning a random or sinusoidal test for accurate mobility measurements. These uses of
impact excitation to obtain qualitative results can be a first stage for mobility measurements.
This document is limited to the use of impact excitation techniques for making accurate mobility
measurements.