Research Article
Acoustic Emission-Based Small Leak Detection of Propulsion System Pipeline of Sounding Rocket
Table 1
Relative values of 10 characteristics indices.
| | Case | Leak rate (ml/s) | Envelope area | Time domain | Frequency domain | | Mean | STD | RMS | Peak | Energy | Skewness | Kurtosis | Peak frequency | Average frequency |
| | C1 | 0 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | | C2 | 0.2 | 1.1563 | 1.0170 | 1.0470 | 1.0416 | 1.0255 | 1.0818 | 1.0310 | 1.0432 | 1.0401 | 1.0230 |
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