Research Article
Mathematical Modelling and Dynamic Analysis of an Offshore Drilling Riser
Table 1
System parameters for the dynamic analyses of the riser model.
| Parameter | Symbol | Value |
| Density of the riser | | 7850 kg/m3 | Elastic modulus | | 210 GPa | External diameter | | 0.5334 m | Internal diameter | | 0.4826 m | Top tension ratio | | 1.3 | Buoyancy factor | | 0.9 | Density of water | | 1050 kg/m3 | Drag coefficient | | 0.7 | Inertial coefficient | | 2.0 | Wave amplitude | | 6.5 m | Wave period | | 8 s | Wind speed | | 5 m/s | Factor of wind speed | | 0.03 | Strong tidal range | | 20 m | Normal tidal range | | 1 m | Geographic latitude | | 10°N | Density of drilling mud | | 1200 kg/m3 | Rotational stiffness of the upper joint | | 1.1e8 N·m/rad | Rotational stiffness of the bottom joint | | 1.1e8 N·m/rad |
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