Research Article
Research on Multipoint Leak Location of Gas Pipeline Based on Variational Mode Decomposition and Relative Entropy
Table 2
Multisource leak location results under different pressures.
| Number | Pressure (MPa) | True positioning value (m) | The proposed method | EMD method | Detection location value (m) | Absolute error (m) | Relative error (%) | Detection location value (m) | Absolute error (m) | Relative error (%) |
| 1 | 0.1 | 6 | 6.11 | 0.11 | 1.83 | 5.45 | 0.55 | 9.17 | 2 | 0.1 | 6 | 6.14 | 0.14 | 2.33 | 5.55 | 0.45 | 7.50 | 3 | 0.1 | 6 | 6.13 | 0.13 | 2.17 | 6.49 | 0.49 | 8.17 | 4 | 0.15 | 6 | 5.48 | 0.52 | 8.67 | 6.39 | 0.39 | 6.50 | 5 | 0.15 | 6 | 5.83 | 0.17 | 2.83 | 5.98 | 0.02 | 0.33 | 6 | 0.15 | 6 | 5.74 | 0.26 | 4.33 | 5.37 | 0.63 | 10.50 | 7 | 0.25 | 6 | 6.17 | 0.17 | 2.83 | 6.48 | 0.48 | 8.00 | 8 | 0.25 | 6 | 6.42 | 0.42 | 7.00 | 5.13 | 0.87 | 14.50 | 9 | 0.25 | 6 | 6.23 | 0.23 | 3.83 | 5.94 | 0.06 | 1.00 | 10 | 0.25 | 6 | 6.44 | 0.44 | 7.33 | 6.56 | 0.56 | 9.33 | 11 | 0.1 | 16 | 15.81 | 0.19 | 1.19 | 14.86 | 1.14 | 7.13 | 12 | 0.1 | 16 | 15.09 | 0.91 | 5.69 | 14.68 | 1.32 | 8.25 | 13 | 0.1 | 16 | 15.84 | 0.16 | 1.00 | 17.89 | 1.89 | 11.81 | 14 | 0.15 | 16 | 16.28 | 0.28 | 1.75 | 16.98 | 0.98 | 6.13 | 15 | 0.15 | 16 | 16.32 | 0.32 | 2.00 | 16.49 | 0.49 | 3.06 | 16 | 0.15 | 16 | 16.29 | 0.29 | 1.81 | 18 | 2.00 | 12.50 | 17 | 0.25 | 16 | 16.32 | 0.32 | 2.00 | 15.02 | 0.98 | 6.13 | 18 | 0.25 | 16 | 15.83 | 0.17 | 1.06 | 15.69 | 0.31 | 1.94 | 19 | 0.25 | 16 | 16.19 | 0.19 | 1.19 | 16.08 | 0.08 | 0.50 | 20 | 0.25 | 16 | 16.48 | 0.48 | 3.00 | 16.99 | 0.99 | 6.19 | 21 | 0.1 | 30 | 29.26 | 0.74 | 2.47 | 28.33 | 1.67 | 5.57 | 22 | 0.1 | 30 | 29.20 | 0.80 | 2.67 | 27.34 | 2.66 | 8.87 | 23 | 0.1 | 30 | 29.05 | 0.95 | 3.17 | 28.41 | 1.59 | 5.30 | 24 | 0.15 | 30 | 30.32 | 0.32 | 1.07 | 27.39 | 2.61 | 8.70 | 25 | 0.15 | 30 | 30.95 | 0.95 | 3.17 | 34.52 | 4.52 | 15.07 | 26 | 0.15 | 30 | 31.13 | 1.13 | 3.77 | 31.89 | 1.89 | 6.30 | 27 | 0.25 | 30 | 29.26 | 0.74 | 2.47 | 28.31 | 1.69 | 5.63 | 28 | 0.25 | 30 | 30.51 | 0.51 | 1.70 | 25.98 | 4.02 | 13.40 | 29 | 0.25 | 30 | 30.54 | 0.54 | 1.80 | 28.6 | 1.40 | 4.67 | 30 | 0.25 | 30 | 29.13 | 0.87 | 2.90 | 27.36 | 2.64 | 8.80 |
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