Research Article
Natural Frequencies and Mode Shapes of Drill Pipe in Subsea Xmas Tree Installation
Table 2
Characteristics of the pipe model.
| | Property | Value | | Model 1 | Model 2 | Model 3 | Model 4 |
| | Length of the pipe (l) m | 0.9 | 1.5 | 0.9 | 1.5 | | Outside diameter (D) mm | 10 | 10 | 40 | 40 | | Thickness of pipe (δ) mm | 1 | 1 | 2.3 | 2.3 | | Density of drill pipe (ρs) kg/m3 | 7930 | 7930 | 7930 | 7930 | | Elastic modulus of steel (E) GPa | 206 | 206 | 206 | 206 | | Add mass coefficient (Ca) | 1 | 1 | 1 | 1 | | Bottom mass of model (WB) kg | 0∼0.55 | 0∼0.55 | 0∼5 | 0∼5 |
|
|
