Full
Outline
Aiming at the problem of difficult diagnosis of mining truck drive system, an intelligent fault diagnosis model was proposed by combining wavelet packet and ensemble empirical mode decomposition (EEMD) method, which was integrated into intelligent operation and maintenance system and applied to mine truck. Firstly, the wavelet packet was used to denoise the vibration signals of bearings and gears in the drive system. Then the EEMD algorithm was used to decompose the signal into several intrinsic mode function (IMF) components, and the feature vector was extracted from the IMF components containing the main state information. Secondly, the support vector machine (SVM) was used to classify the fault modes. The penalty parameter C and kernel function parameter h of SVM were optimized by particle swarm optimization (PSO), genetic algorithm (GA) and multi-population genetic algorithm (MPGA). Four fault diagnosis models of SVM, PSO-SVM, GA-SVM and MPGA-SVM were constructed respectively. It is concluded that MPGA-SVM is the optimal fault diagnosis model, and the diagnostic accuracy of bearing fault and gear fault is the highest, which is 98.75% and 6.67% respectively. Finally, aiming at the RE1060 drive system of XDE320 electric-driven mining dump truck, an intelligent operation and maintenance system including four modules of signal acquisition and storage, time-frequency analysis, fault feature extraction and intelligent fault diagnosis was developed by MATLAB and LabVIEW. The research shows that the intelligent operation and maintenance system can realize on-line monitoring and diagnosis of existing faults, which is of great significance to improve the safe and efficient operation of mining trucks.
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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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