Abstract
The authors propose a small isolation table with coil springs and roller bearings in order to obtain a vibration isolation table which is simple in construction, low cost and effects of seismic isolation. The table board is supported by four legs with roller bearings, and connected by four coil springs to the base plate. The table is able to move smoothly any horizontal direction. A sliding type friction damper is also installed beside the legs for suppress the resonance of the isolation table under strong long period components. The trial isolation table is manufactured, and resisting force characteristics are measured. Next, seismic vibration tests are carried out using a shaking table. Response acceleration and displacement are measured when earthquake which has a strong long period component are inputted, and the experimental results are compared with the calculated results. Finally, the effect of seismic isolation and the propriety of the calculation are confirmed.
