A repeating rhythm can help distinguish the pattern from a continuous fan-like sound or an occasional operating click. It does not identify a component by itself.
Understanding this situation
Load contents, loose objects and mechanical conditions can produce different sounds. Use observations already made during ordinary operation; a concerning scrape or impact should not be repeatedly reproduced for a clearer recording.
A useful next step
Note the stage, load and any visible movement. Stop use if damage or unsafe operation is suspected. Do not reach into a powered drum, help it turn or remove guards to locate the sound.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.