The thickness of the elastomer layer, te, is kept constant
(4.7 mm in all cases), while the number of high damping rubber
layers, ne, increases from 6 to 18.
The aspect ratio of rubber bearing is defined as a ratio of the
effective height (Heff) to the length (L).
R ¼
Heff
L ð1Þ
where the effective height is measured by subtracting the thickness
of two supporting steel plates (ts) from the total height (H).
Heff ¼ H 2ts