Acoustic, Noise, Vibration & NVH Products worked example

Vibration Isolation Efficiency at 50% target isolation efficiency: a worked example

This worked example runs the vibration isolation efficiency numbers for a tougher week than the baseline: 50% target isolation efficiency instead of the typical 70%. Calculate isolation efficiency from reduced vibration level versus incoming vibration level and compare with a target.

The inputs for this scenario

  • Vibration amplitude removed by isolators: 0.18 in/s (held at the documented default)
  • Incoming vibration at the mount: 0.25 in/s (held at the documented default)
  • Target isolation efficiency: 50 % (the input this scenario stresses; the baseline uses 70)

Working through the calculation

  • The calculation starts from the formula this tool documents: Isolation efficiency = vibration reduced รท incoming vibration level.
  • Isolation efficiency works out to 72 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target works out to -22 points at these inputs.
  • Vibration reduced works out to 0.18 in/s at these inputs.
  • Incoming vibration works out to 0.25 in/s at these inputs.

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. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Isolation efficiency: 72 % (headline result)
  • Gap to target: -22 points
  • Vibration reduced: 0.18 in/s
  • Incoming vibration: 0.25 in/s

Run it with your numbers

  • To rerun this with your own numbers, open the live Vibration Isolation Efficiency calculator, set target isolation efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.