Type I Solid Dampers

For example, Low Damping Natural Rubber

For this group of materials,

Type II High Dasmping Material

For example, synthetic rubber

where     s.t.   (note this type of material shows frequency dependent stiffness

The transmissibilities corresponding to the range of nondimensional frequency parameter (0.1 to 10) is shown in the following figure. Note that at high frequency Type I damper performs better than Type II.

Figure 21.2: Transmissibility vs normalized frequency

Congratulations! You have finished Lecture 21.