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Outline
In mine production, the roof fall accident of working face is directly related to the hydraulic support. According to this theory, a prediction model based on multi-source data fusion was proposed to predict the load of hydraulic support. By studying the theory of pressure deformation characteristics of coal seam roof, the composition and working principle of hydraulic support, the bearing theory and the influence of working condition on hydraulic support, the influencing factors of load change were analyzed, and the data of key stress components were collected. The K-means clustering algorithm was used to cluster the characteristics of the data, and the load was classified and predicted. The whale optimization algorithm (WOA) was used to optimize the long short-term memory network (LSTM) and the deep belief neural network (DBN) respectively, and the WOA-LSTM series prediction model and the WOA-DBN series prediction model were established. The results are as follows. Firstly, the mean absolute error is reduced by 0.228 7, 0.206 4 and 0.067 7 respectively in the prediction of the front column load of 20# hydraulic support by WOA-DBN model. The root mean square error is reduced by 0.212 9, 0.195 3 and 0.072 5, respectively. Secondly, in the prediction of the rear column load of 20# hydraulic support by WOA-DBN model, the mean absolute error is reduced by 0.303 1, 0.244 6 and 0.205 4 respectively. The root mean square error is reduced by 0.291 9, 0.246 4 and 0.238 9, respectively. It can be seen that the WOA-DBN series prediction model is more suitable for load prediction and has higher accuracy.
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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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