Numerical Simulation of Dynamic Response Characteristics of Cutting Coal and Rock by a Roller Coal Cutter

Table 2

Dynamic characteristics of different media.

Cuting medium	Dynamic behaviour
	Reaction torque (kN·m)	Average cutting velocity (m·s^−1)	Instantaneous velocity (m·s^−1)	Rebound phenomenon
Single coal seam	0∼600	0.64	0∼0.11	No rebound phenomenon
Coal-mudstone assemblage, mudstone accounting for 1/6	0∼650	0.45	−0.04∼0.08	Rebound points account for 2％
Coal-mudstone assemblage, mudstone accounting for 1/3	0∼700	0.41	−0.04∼0.1	Rebound points account for 7％
Single mudstone	0∼1200	0.31	−0.1∼0.14	Rebound points account for 18％
Coal-sandstone assemblage, sandstone accounting for 1/6	0∼700	0.28	−0.08∼0.1	Rebound points account for 20％
Coal-sandstone assemblage, sandstone accounting for 1/3	0∼1200	0.21	−0.1∼0.1	Rebound points account for 36％
Single sandstone	0∼1685	0.12	−0.27∼0.29	Rebound points account for 45％