Abstract: Drilling parameters directly affect the vibration characteristics,drilling efficiency and rock breaking energy
consumption. The drilling tests of three kinds of strength rocks(cyan sandstone 84. 47 MPa,limestone 77. 60 MPa,red sandstone
43. 73 MPa) under different axial pressures(100~140 N) and rotational speeds(800~1 100 r/ min) were carried out,
and the drilling depth,speed,energy consumption and vibration signal characteristics were analyzed. The results show that the
drilling speed are positively correlated with the axial pressure and rotation speed. For medium-strength rocks(green sandstone
and limestone),increasing the rotation speed is helpful to improve the drilling rate. For soft rock (red sandstone),adjusting the
axial pressure is more significant for the improvement of drilling efficiency. The energy consumption of rock breaking is approximately
linearly positively correlated with the drilling depth,and the parameters with the lowest energy consumption can be obtained
by optimizing the axial pressure and rotational speed. In addition,the vibration displacement and vibration frequency are
positively correlated with rock strength. The vibration displacement range and characteristic peak frequency of different rocks
are different. The characteristics of rock can be identified by the characteristic frequency of rock vibration,so as to optimize the
configuration of drilling parameters. Therefore,reasonable selection of drilling parameters can improve drilling efficiency,reduce
energy consumption,and provide optimization schemes for drilling different rocks.