Sonelastic
®
Systems
SA-BC Adjustable support for bars and cylinders
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10. Acquisition and excitation modes
The table below describes the most practical positions of the acoustic sensor and impulse
device for characterizing rectangular specimens, using flexural, torsional and longitudinal
vibration modes.
Flexural mode
– I
Excitation from above and
signal acquisition from below,
both aligned with the center
of the specimen.
Cables positioned at 0.224L.
Flexural mode - II
Excitation and signal
acquisition from below, both
on the specimen ends.
Cables positioned at 0.224L.
Longitudinal mode
Top-centered excitation and
signal acquisition from
opposite sides of the
specimen.
Cables positioned at 0.224L.
Fl torsional
modes - I
Excitation from above and
signal acquisition from below,
positioned at 0.32L from
opposed edges.
Cables positioned at 0.224L.
Flexural and torsional
modes - II
Excitation and signal
acquisition from, positioned
at 0.32L on opposed edges.
Cables positioned at 0.224L.
