Mathematical Modeling and Analysis of Drill String Longitudinal Vibration with Lateral Inertia Effect

Table 3

Calculated parameters of the inside and outside radius influence.

Name of parameters	Results
Poisson’s ratio of the drill string	0.30
Length of the drill string H (m)	2000
Outside radii of the drill string , (m)	0.10
Outside radii of the drill string , (m)	0.11
Inside radii of the drill string , (m)	0.08
Inside radii of the drill string , (m)	0.09
Damping coefficient (Ns/m)	10000