Natural Frequencies and Mode Shapes of Drill Pipe in Subsea Xmas Tree Installation

Figure 4

The frequencies of pipes in different methods: (a) model pipe 1 in Exp1, (b) model pipe 1 in Exp2, (c) model pipe 2 in Exp7, (d) model pipe 2 in Exp8, (e) model pipe 3 in Exp13, (f) model pipe 3 in Exp14, (g) model pipe 4 in Exp19, and (h) model pipe 4 in Exp20.

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