Modal Hammer Test: A Step-by-Step FRF Measurement
12:40
In this video I demonstrate a modal hammer test on a simple beam from start to finish — a practical flow from setup to FRF interpretation.
What's in the Video?#
- Choosing the modal hammer and accelerometer
- Triggering and windowing settings (force/exponential window)
- Multi-impact averaging and coherence checking
- Reading natural frequencies off the FRF
Watch for this
A coherence curve close to 1 at the natural frequencies indicates a reliable measurement. It is normal for it to drop at anti-resonances.
For the theoretical background I recommend the modal analysis article, and for setup details the Simcenter notes.