Isolated Base Plates and Foundations
Most Research and Development Centers performing dynamic
tests on structures or subassemblies require large inertia
masses to react the energy produced by the test equipment.
Those inertia masses are commonly build as concrete
seismic mass designs with floor plates on top. The floor
plates are attached to the seismic mass via pre-loaded
anchor frame constructions. Because a seismic mass can
not be infinite large, a certain amount of energy is
dissipated into the ground. This energy can influence
results on other test rigs or measuring devices in NVH
labs. For that reason seismic masses can be suspended
on steel or air springs. Air springs are suited best
if a low natural frequency is required, commonly around
0.8 to 1.2 Hz.
more information on seismic mass designs and vibration