Wire mesh material

Use of stainless cold drawn wire (0.1-0.6 mm) diameter; knit into bands and wrapped into round packs has been used widely as vibration isolator. The stiffness of the system is given by:

a - ratio of the vibration amplitude to       element height A - material parameter

The material is strongly hardening for static loading and strongly softening for dynamic loading.

Felt

Same like wiremesh but developed using nylon or rubber fibre. The dynamic stiffness is given by

where, N,M, A - material parameter

The next figure shows an approximate guideline for choosing an isolator material based on the level of development.

Figure 20.6: Different non linear springs [Ref: Passive Vibration Isolator
          Eugene Rivin]

Congratulations! You have finished Lecture 20.