An Optimal Algorithm for Planning Shearer Trailing Drum Cutting Path

Abstract

The intelligent adaptive cutting of the shearer is one of the key technologies to realize the intelligent working face. However, since the “memory cut” technology is the mainstream technology, which cannot actively adapt to the coal seam variations, the trailing drum usually cuts at a fixed height without a planned cutting path. This paper analyzes the shearer’s location characteristics before and after the advancement to propose a complete calculation method for the advancing path of the shearer, which simulates all of its possible advancing paths for subsequent n cuttings. The multitree and depth-first search algorithms are utilized to filter out the optimal advance path under different mining requirements. Simultaneously, this paper indicates that the vertical curvature of the armored face conveyor (AFC) should be considered in the calculation process of the optimal advancing path at different positions of the working face to obtain the shearer’s planned cutting path for subsequent n cuttings. The proposed algorithm in this paper has apparent advantages over the “memory cut” technology and provides a good solution for the intelligent planning of cutting and pitch steering of the shearers.

Numerical simulation of the effect of combustion characteristics of main charges on the output shock of a typical igniter

“…The pressure contours in the closed bomb are shown in Figure 3 The output pressure and output shock of the igniter were obtained by a multiparameter simultaneous test system using the closed bomb and the shock response plate. The specific details of the test procedure and data processing method are described in the literature [13].…”

“…The structure of the igniter [13] is shown in Figure 1, which mainly consists of an igniter housing, two electrode plugs, a bridge wire, a closure disk, a primary charge, a main charge (150 mg) and sealing components. Numerical simulations were performed to study the effect of the combustion characteristics of the main charges on the output pressure and shock response of the igniter.…”

“…According to the structure of the igniter and the multi-parameter test system, a finite element model was developed [13], as shown in Figure 2. The finite element model consists of the closed bomb, the shock response plate and the fluid domain.…”

“…The SBP is the second, and the peak pressure is 39.39 MPa. The CPN and the BPN produce similar amounts of gas with peak pressures of 13 Figure 8 (a) shows the acceleration results of the monitoring point and the corresponding shock response spectra (SRS). It can be seen from the results in Figure 8(a) that the SRS increases as the reaction rate and the gas production of the main charges increase.…”

“…Pressure contours in closed bomb during the process of APP combustion.The output pressure and output shock of the igniter were obtained by a multiparameter simultaneous test system using the closed bomb and the shock response plate. The specific details of the test procedure and data processing method are described in the literature[13].Figure4compares the pressure results obtained from the experiments and the numerical simulation. It can be seen that the rate of pressure ramping in the rapid pressure rise phase is the same between the simulation and the tests.…”