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/m^3
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/m^3
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/m^3
Rotational stiffness of the upper joint		1.1e8 N·m/rad
Rotational stiffness of the bottom joint		1.1e8 N·m/rad