Acoustic, Noise, Vibration & NVH Products worked example
Resonance Frequency Check at 99% signal confidence: a worked example
Push signal confidence up to 99% and the picture changes. This example computes every intermediate figure at that operating point. an NVH or test engineer needs a fast frequency check from measured cycles over a known time window
The inputs for this scenario
- Measured vibration cycles: 3,600 cycles (unchanged)
- Measurement time: 120 s (unchanged)
- Signal confidence: 99 % (raised for this scenario; the documented default is 95)
Working through the calculation
- Applying the documented formula (Raw frequency = measured vibration cycles รท measurement time) to the inputs above produces each figure below.
- At this operating point the engine returns 29.7 Hz for estimated resonance frequency, the number this scenario is built around.
- At this operating point the engine returns 30 Hz for raw measured frequency.
- At this operating point the engine returns 99 % for signal confidence.
- At this operating point the engine returns 120 s for measurement time.
How this compares with the baseline
- Against the tool's baseline example, where signal confidence sits at 95% and the headline result is 28.5 Hz, this scenario comes in 4.21% above the baseline at 29.7 Hz.
- It divides counted vibration cycles by the measurement time to get raw frequency, then scales by signal confidence to give an estimated resonance frequency. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.
Results at a glance
- Estimated resonance frequency: 29.7 Hz (headline result)
- Raw measured frequency: 30 Hz
- Signal confidence: 99 %
- Measurement time: 120 s
Run it with your numbers
- Every input above is editable in the live Resonance Frequency Check calculator, which recalculates instantly and can be shared with the inputs intact.
Last reviewed 2026-05-12.