Acoustic, Noise, Vibration & NVH Products calculator
Vibration Isolation Efficiency Calculator
Isolation efficiency shows how much vibration is removed by mounts, pads, springs, or floating floors. This calculator compares vibration after isolation with vibration before isolation so engineers can judge whether the installed system is meeting the target.
What this calculator does
- Calculate isolation efficiency from reduced vibration level versus incoming vibration level and compare with a target.
- an NVH engineer or facilities manager needs a quick percent isolation check from measured vibration levels
- Returns percent vibration isolation based on before-and-after vibration levels.
Formula used
- Isolation efficiency = vibration reduced ÷ incoming vibration level
- Gap to target = target isolation efficiency - isolation efficiency
Inputs explained
- Vibration reduced: undefined
- Incoming vibration level: undefined
- Target isolation efficiency: undefined
How to use the result
- Use it for mount validation, floor isolation checks, machine troubleshooting, and acceptance testing.
- Use the same measurement axis, frequency band, sensor location, and operating condition; broadband percent can hide frequency-specific resonance.
Common questions
- Can I use acceleration instead of velocity? Yes if both inputs use the same unit, such as g, m/s², mm/s, or in/s.
- Is percent isolation the same as transmissibility? They are related. Isolation efficiency is reduction percentage; transmissibility is typically output divided by input.
- Why can isolation look poor at some speeds? If operating frequency is near natural frequency, transmissibility can rise and isolation can drop.
- What action does the result support? Use it to decide whether to change mount stiffness, add mass, adjust speed, or investigate flanking paths.
Last reviewed 2026-05-12.