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CHAPTER 3
15
Operating Characteristics
Moving Elements
The low armature weight helps to ensure high-quality force measurements by mini-
mising force drop-offs at the test specimen's resonance frequencies. Four upper and
four lower radial flexures, the latter providing an additional guide for best stabilisa-
tion, form a strong rectilinear guidance system that keeps the driver coil perfectly
centered in the magnetic assembly's air gap. In the transverse directions and in
torsion, the flexure system provides very high stiffness to counteract rotational
movement of the test specimen. Also, through this configuration, the modal exciter
can absorb high lateral forces without damage to the exciters internal construction.
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