Acoustic, Noise, Vibration & NVH Products worked example

Vibration Isolation Efficiency at 81% target isolation efficiency: a worked example

This scenario runs the vibration isolation efficiency calculation on the strong side: 81% target isolation efficiency, with every other input held at its documented default. an NVH engineer or facilities manager needs a quick percent isolation check from measured vibration levels

The inputs for this scenario

  • Vibration amplitude removed by isolators: 0.18 in/s (unchanged)
  • Incoming vibration at the mount: 0.25 in/s (unchanged)
  • Target isolation efficiency: 81 % (raised for this scenario; the documented default is 70)

Working through the calculation

  • Applying the documented formula (Isolation efficiency = vibration reduced รท incoming vibration level) to the inputs above produces each figure below.
  • At this operating point the engine returns 72 % for isolation efficiency, the number this scenario is built around.
  • At this operating point the engine returns 9 points for gap to target.
  • At this operating point the engine returns 0.18 in/s for vibration reduced.
  • At this operating point the engine returns 0.25 in/s for incoming vibration.

How this compares with the baseline

  • Against the tool's baseline example, where target isolation efficiency sits at 70% and the headline result is 72 %, this scenario lands almost exactly on the baseline at 72 %.
  • Use it after installing or tuning machine isolators when you have paired vibration readings on the source side and the isolated side of the mount. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Isolation efficiency: 72 % (headline result)
  • Gap to target: 9 points
  • Vibration reduced: 0.18 in/s
  • Incoming vibration: 0.25 in/s

Run it with your numbers

  • Every input above is editable in the live Vibration Isolation Efficiency calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.