Research Article
High Sensitive Methods for Health Monitoring of Compressor Blades and Fatigue Detection
Table 4
Blade with 11 mm length damage (starting from TE) placed 20 mm from lock [
23,
25].
| Blade | Frequency change (Hz) | 1st mode | 2nd mode | 3rd mode |
| Cracked | −12 | +7 | −27 | Notched (no friction) | −13 | −5 | −80 | Difference (%) | −0.28 | −0.86 | −2.73 |
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