Scaled modal models require a precise force measurement.
This can be achieved by electrodynamic and servohydraulic
exciters controlled by a signal generator via a power
amplifier. A more convenient and economical excitation
method is a hammer fitted with a high-quality piezoelectric
force transducer. In applications where a high crest factor
and a limited ability to shape the input force spectrum
is of no concern, impact hammer testing is an ideal source
of excitation. Impact hammers are highly portable for
field work and provide no unwanted mass loading to the
structure under test.
The Modal Hammer excites the structure with a constant
force over a frequency range of interest. Three interchangeable
tips are provided which determine the width of the input
pulse and thus the bandwidth. Typical force spectra produced
with different tips are shown on the right.
For larger structures, an optional head extender is available
to increase the head's mass. The hammer structure is acceleration
compensated to avoid glitches in the spectrum due to hammer
structure resonances. The ergonomically designed handle
grip helps the user optimize control and reduce the possibility
of "double hits".
Features:
• Model 2302 -5, -10, -50, -100
• Four ranges
• 3 replaceable tips
• Low impedance (ISOTRON) output
• Acceleration compensated
• Ergonomically designed grip
Scaled modal models require a precise force measurement.
This can be achieved by electrodynamic and servohydraulic
exciters controlled by a signal generator via a power
amplifier. A more convenient and economical excitation
method is a hammer fitted with a high-quality piezoelectric
force transducer. In applications where a high crest factor
and a limited ability to shape the input force spectrum
is of no concern, impact hammer testing is an ideal source
of excitation. Impact hammers are highly portable for
field work and provide no unwanted mass loading to the
structure under test.
