Vibration Isolation reduces the level of vibration transmitted to or from a machine, building or structure from another source.
The degree of isolation achieved depends on the ratio:2: The level of isolator damping C/Cc.
Referring to the diagram 3.07, the degree of isolation is given as Transmissibility (i.e. amount of vibration transmitted at a specific frequency ƒe as a fraction of the disturbing vibration at the same frequency ƒe).
> 1 = Increased transmitted vibration
= 1 = No vibration isolation
< 1 = Vibration isolationTransmissibility T can be read from diagram 3.2 or calculated as follows:
If no damping present in isolators i.e. C/Cc = 0
Damping Factorfrequency ratio R fe/fn
|Percentage Isolation Efficiency|
Ktd = Sum of Isolator Dynamic Spring Constants
M = Supported system mass kg.
For natural rubber and coil spring isolators static and dynamic spring constants are the same.