Research Article
Dynamic Characteristics and Key Parameter Optimization of Mechanical Automatic Vertical Drilling Tools
Table 1
The theoretical values of platform design parameters.
| | Parameter name | Parameter value |
| | Outer diameter (m) | 0.11 | | Inner diameter (m) | 0.045 | | Density (kg/m3) | 11000 | | Gravity acceleration (m/s2) | 9.8 | | Friction radius of thrust bearing (m) | 0.08375 | | Friction coefficient of thrust bearing | 0.0015 | | Friction radius of radial bearing (m) | 0.081 | | Friction coefficient of radial bearing (m) | 0.0025 | | Fluid pressure on disc valve (MPa) | 1 | | Pressure area of disc valve (mm2) | 2713 | | Friction radius of disc valve (m) | 0.054 | | Friction coefficient of disc valve | 0.2 |
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