BS 6897-5:1995 Experimental determination of mechanical mobility - Part 5. Measurement using impact excitation with an exciter which is not attached to the structure
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This part of ISO 7626 specifies procedures for meas-
uring mechanical mobility and other frequency-
response functions of structures excited by means of
a translational 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 part of ISO 7626 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. 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 uncali-
brated 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 mo-
bility measurements. However, these uses of impact
excitation to obtain qualitative results should not be
confused with its use for mobility measurements.
This part of ISO 7626 is limited to the use of impact
excitation techniques for making accurate mobility
measurements.
BS 6897-5:1995 Experimental determination of mechanical mobility - Part 5. Measurement using impact excitation with an exciter which is not attached to the structure