Rotary Machine Rubbing Detection via AE and Gap Index

The patent combines AE signal-based determination with gap amount-based determination into a unified rubbing determination system. The AE signal acquisition unit detects acoustic emissions, while the gap amount acquisition unit measures clearance between rotary and stationary parts. These two independent determination results are integrated to produce a comprehensive rubbing determination, compensating for the weaknesses of each individual method and improving overall accuracy.

The patent makes existing sensors serve multiple functions. The AE sensor, originally designed for acoustic emission detection, is also utilized for gap amount determination through signal analysis. This multi-functional use of existing sensors eliminates the need for additional dedicated gap measurement sensors, thereby reducing both installation costs and labor requirements while still providing accurate gap data.

The patent implements a feedback mechanism where the estimation model's output is continuously refined based on actual measurements. The system uses operation parameters (temperature, rotation speed, load) to estimate gap amounts through a pre-established model, then compares these estimates with actual sensor measurements. This feedback loop allows the system to adapt to aged deterioration and maintain accuracy without requiring new sensor installations, as the model learns from real-world deviations over time.