High Sensitive Methods for Health Monitoring of Compressor Blades and Fatigue Detection

Figure 20

Result of the DETREND procedure for TOA(𝑘) signal measured for (a) the last stage of SO-3 engine compressor (49 blades in the palisade)—the pitch errors are dominating in the jitter 𝜁_𝐵; (b) the first stage of SO-3 engine compressor—the component 𝐼(𝑘)=𝐼(𝑛,𝑑𝑛/𝑑𝑡) is revealing the influence of some asynchronous parts of jitter 𝜁_𝜔 on the component 𝐴(𝑘) (e.g., rotor vibration, fluctuation in the rotational speed on the compressor limits) [3].

(a)

(b)