Research Article
Fault Diagnosis of Piezoelectric Sensor Patches for Vibration Control Based on Multifeature Fusion and Improved SVM
Table 2
Hilbert marginal spectral characteristics of three types of piezoelectric patch signals.
| | Hilbert marginal spectral features of the first five IMF components | | Category | The frequency at which the maximum marginal spectral amplitude is reached | The maximum value of the marginal spectrum |
| | Normal | 207.5 | 45.5 | 23.0 | 10.0 | 5.0 | 0.05268 | 3.687E−04 | 8.883E−07 | 6.005E−06 | 1.145E−06 | | 205.0 | 55.0 | 9.0 | 4.5 | 2.5 | 0.08211 | 4.748E−04 | 4.220E−05 | 4.539E−07 | 3.240E−07 | | 207.0 | 54.0 | 10.0 | 4.0 | 2.0 | 0.05106 | 8.134E−04 | 8.043E−05 | 6.326E−07 | 7.255E−07 | | 208.5 | 48.5 | 10.0 | 8.0 | 1.0 | 0.04373 | 7.306E−04 | 1.283E−04 | 2.282E−06 | 4.673E−06 | | 211.0 | 49.0 | 9.5 | 5.0 | 2.5 | 0.03623 | 8.028E−04 | 1.045E−04 | 8.916E−07 | 6.016E−07 |
| | Broken | 159.5 | 131.5 | 34.5 | 52.0 | 7.0 | 0.02265 | 1.769E−03 | 7.381E−04 | 8.236E−04 | 1.310E−03 | | 155.5 | 104.5 | 52.0 | 27.0 | 10.0 | 0.05231 | 1.568E−05 | 1.398E−04 | 2.027E−07 | 1.580E−06 | | 155.0 | 40.0 | 49.0 | 9.5 | 10.0 | 0.04550 | 1.035E−04 | 1.086E−04 | 1.814E−06 | 8.508E−06 | | 199.0 | 40.0 | 50.5 | 19.0 | 9.5 | 0.04392 | 1.446E−04 | 1.490E−04 | 1.259E−06 | 1.882E−06 | | 159.0 | 46.0 | 50.0 | 18.5 | 10.0 | 0.04837 | 8.928E−05 | 2.126E−04 | 2.106E−06 | 1.225E−05 |
| | Degummed | 224.5 | 41.5 | 27.5 | 19.5 | 9.0 | 3.874E-06 | 6.291E−08 | 5.298E−09 | 2.180E−09 | 2.338E−09 | | 179.5 | 48.5 | 27.5 | 19.0 | 10.0 | 4.547E-06 | 8.163E−08 | 8.107E−09 | 4.393E−09 | 2.192E−09 | | 223.5 | 49.0 | 21.0 | 10.5 | 2.5 | 5.661E-06 | 7.140E−08 | 2.590E−09 | 2.525E−09 | 1.116E−09 | | 223.5 | 40.0 | 18.5 | 10.5 | 9.0 | 4.722E-06 | 6.222E−08 | 2.888E−08 | 1.659E−08 | 8.504E−09 | | 225.5 | 44.5 | 20.5 | 9.5 | 5.0 | 3.911E-06 | 6.287E−08 | 1.890E−09 | 2.391E−09 | 8.536E−10 |
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