A vibration control system for an automated warehouse was developed that can be applied to
existing warehouses as well as newly built ones. The device used for this system is the “postinstalled
mass damper” that can be post installed on the cargo storage space in an automated
warehouse. This damper has a large mass that causes a sustainable effect of reducing the
response across a wide range of natural frequencies of an automated warehouse, which vary
depending on the number of stacked cargoes and their weight. The results of the shaking table
test demonstrated that the fall of cargoes by the earthquake ground motion could be prevented
by using this damper because the accelerations of the rack were reduced to 50%-70%. Moreover,
this effect was confirmed by the analysis conducted with the proposed model. The acceleration of
the rack top was reduced to 80% and the maximum slip displacement of the cargoes was reduced
to 25%.
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