## 5 Experiments  
### Establishment of Dataset of Shearer Drum Height Prediction Model  
#### 5.1.1 Determine Initial Feature Parameters  
The experimental data set comes from the 43101 fully mechanized mining face in Yujialiang Mine, Shaanxi, China. This fully mechanized mining face has a length of 351.4 m, an average coal seam thickness of 1.47 m, and an average height of 1.4 m. The degree is 3\({}^{\circ}\)-5\({}^{\circ}\). The fully mechanized mining equipment is as follows: the hydraulic support adopts the ZY9200/09/18D double-column shield type, the shearer adopts the MG2 type, and the scraper conveyor adopts the SGZ800/1400 type. The collection time interval is from 7-23 April 2021, and the sampling period is 1.0 s. Figure 5 shows the cutting site of 43101 fully mechanized mining face, including shearer, scraper conveyor and hydraulic support.  
There are various types of data for drum height adjustment, including sensing data such as current, temperature, and speed. At present, the monitoring system in the comprehensive collection can easily collect and record these data. The original dataset includes 15 conditional attributes and one set of decision attributes, and the total number of samples is 16,860. The condition attribute can be divided into two categories according to the operate mechanism of the shearer: the state attribute of the shearer, and the state attribute of the shearer drum, respectively. The condition attributes are shown in Table 1, which lists the relevant operating characteristic parameters of shearer and drum, including current, voltage, temperature, relative position, angle and other sensing characteristic parameters.  
Figure 4: Flow of FRRBFNN parameter optimization algorithm based on AIGA.  
Figure 5: Diagram of 43101 comprehensive mining face.  
In Table 1, two characteristic variables--the pitch angle \(c_{1}\) of the shearer and the roll angle \(c_{15}\) of the drum--reflect the fluctuation changes of the working face floor, and to a certain extent reflect the spatial position of the shearer. The height changes \(c_{11}\) and \(c_{14}\) of the shearer drum reflect the undulation of the working face roof. Therefore, Table 1 not only describes the operating conditions of the shearer, but also to a certain extent describes the environmental conditions of the working face.  
The decision attribute is determined by subtracting the height of the left and right drums of the shearer at time \(t+1\) to the height of the left and right drums of the shearer at time t. When the drum height value at time \(t+1\) minus the drum height value at time \(t\) is equal to 0, the position of the drum of the shearer remains unchanged, and it is recorded as a decision attribute with a value of 0. When the drum height at time \(t+1\) minus the drum height at time \(t\) is greater than 0, the position of the drum of the shearer rises, and it is recorded as a decision attribute with a value of 1; When the drum height at time \(t+1\) minus the drum height at time \(t\) is less than 0, the position of the drum of the shearer drops, which is recorded as a decision attribute with a value of 2. The meaning of decision attributes is shown in Table 2.