# A positive energy residual (PER) based planetary gear fault detection method under variable speed conditions

> Research article (Mechanical Systems and Signal Processing, 2018) · cited 53× · AI/ML

**Wikidata**: [openalex:W2887960321](https://www.wikidata.org/wiki/openalex:W2887960321)  
**Source**: https://4ort.xyz/entity/a-positive-energy-residual-per-based-planetary-gear-fault-detection-method-under-variable-speed-conditions