Technical Glossary Conductivity(dB)

[Conductivity (dB)]

When precision machinery is supported by vibration insulators, the proportion of the base frequency transferred to machinery is called the vibration conductivitytau. A dB value is often used to indicate conductivity.

tau : Vibration conductivity
a0 : Forced displacement of the base (or speed and acceleration)
a : Mechanical displacement (or speed and acceleration)

When, for example, the vibration conductivity (tau) is 2, it is noted in dB as 6 dB.Every time the conductivity is increased 10-fold, the dB value increases by 20; when it is 1/10, the dB value decreases by 20.

(tau-dB conversion chart)

τ	dBvalue	τ	dBvalue
1	0dB	0.5	-6dB
2	6dB	0.1	-20dB
10	20dB	0.01	-40dB
100	40dB