Currently, the DTH RIGS use generally a percussion rotary penetration sys-tem to generate the rotating torque that produces a shearing action for breaking rock.
目前，潜孔钻机普遍采用冲击回转凿入系统，用以产生回转力矩，对岩石产生剪切作用而成颗粒分离。
2
The result also denotes the shearing deformation and rotary inertia of the beam have significant effect on the high frequency.
当考虑梁的剪切变形和转动惯量时，则对梁的高阶频率影响较大。
3
The high natural frequencies of symmetrical section beam with different constraints are calculated in detail, and effects of rotary inertia and shearing deformation are given.