Rubber vibration isolation bearing

However, to isolate the vibration of a machine from the floor, the resonant frequency must be less than 40% of the vibration frequency, and the best performance occurs with little or no damping. Rubber and steel laminated bearings (Section 4.2.1) have low resonant frequencies, and the moderate tan 6 value of the rubber (0.07-0.30) prevents severe resonance on start up. 

The method presented above is now applied to a passive control of seismic vibrations using base isolation with steel-rubber bearings. Consider the two-floor base isolated building depicted in Figure 8. For the ground, base and structure absolute displacements illustrated in the figure, the relative displacements are... 

The main use of NR is in automobiles. In developed countries nearly 60% of all rubber consumed is for automobile tyres and tubes. The superior heat build-up and tensile strength of NR makes it indispensable in the manufacture of aviation tyres. In heavy-duty tyres such as those for tractors and trucks, the major portion of the rubber used is NR. In addition to tyres, a modern automobile has more than 300 components made out of rubber. Many of these are processed from NR. NR is also widely used in the manufacture of hoses, footwear, battery boxes, foam mattresses, balloons, toys, etc. In addition to this, NR now finds extensive use in soil stabilization, in vibration absorption and in road construction. A variety of NR-based engineering products have been developed for use in these fields. Seismic isolators, bridge bearings and dock fenders are niche products relying on the superior properties of NR. 

H. Hamaguchi, Y. Samejima and N. Kani, A study of aging effect on rubber bearings after about twenty years in use, 11th World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures, Guangzhou, China, 17-21 November 2009. 

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