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In cooling systems of thermal and nuclear power generating unit, the bearing fault signal of the motor is weak and nonlinear, which is easily masked by running signals and invalid signals, and the use of a single vibration monitoring may not be sufficient to collect complete defect information. To address this problem, vibration and sound signals are combined to monitor bearing fault signals, and the collected sound and vibration signal features are fused. To process the sound and vibration signals of motor bearings, a WR-VMD algorithm that integrates wavelet ridge (WR) and varational mode decomposition (VMD) is proposed. The WR is used to analyze the components of the original signal, and then the acquired information is used to determine the parameters of the VMD, which makes up for the shortcomings of the original VMD method that requires the parameters to be set empirically in advance. The simulated signal results show that, compared with the same type of methods, the features extracted by the WR-VMD method are the most obvious and have the least interference information. Finally, the acoustic and vibration signal fusion technique and the WR-VMD algorithm are applied to the measured motor bearing fault data, and the results show that, compared with other feature extraction algorithms of the same type, the WR-VMD extracts the most obvious features and has the highest accuracy in fault diagnosis. The acoustic and vibration signal fusion has at least a 7% increase in accuracy compared with a single vibration or acoustic signal in fault diagnosis.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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