Sandwich structures for vibration isolation tables are stiffer than solid tables of equal weight. For the same weight, the fundamental frequency of a sandwich table is higher than that of a solid table. Although the bending behavior of a sandwich table is complex, the following simple approximations are useful.
The fundamental frequency of a vibration isolation table acted on by only self-weight is given by:

Sandwich structures for vibration isolation tables are stiffer than solid tables of equal weight. For the same weight, the fundamental frequency of a sandwich table is higher than that of a solid table. Although the bending behavior of a sandwich table is complex, the following simple approximations are useful.
The fundamental frequency of a vibration isolation table acted on by only self-weight is given by: