Analysis of the Longitudinal-Bending-Torsional Coupled Vibration Mechanism of the Drilling of a Roof Bolter for Mine Support System

Figure 6

First six mode shapes of the drill string. (a) 1st order; (b) 2nd order; (c) 3rd order; (d) 4th order; (e) 5th order; and (f) 6th order.

(a)

(b)

(c)

(d)

(e)

(f)