Study on Synchronous Response Law of Acoustic and Electrical Signals of Outburst Coal Rock under Load and Fracture

Table 1

Performance index of the testing machine.

Category	Parameter value	Category	Parameter value
Maximum test force	600 kN	Stiffness	≥5000 kN mm^-1
Piston stroke	≥60 mm	Relative error of test force	±1%
Measurement range	0–60 mm	Test force sensing element	Pressure sensor
Experimental resolution	3 N	Test force resolution	1/200000%fs
Displacement resolution	0.3 μm	Resolution	1/200000%fsmm
Relative error	±0.5%	Clear width of test space	300 mm