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

Table 4

Calculation parameters of the damping coefficient influence.

Name of parameters	Results
Poisson’s ratio of the drill string	0.30
Length of the drill string (m)	2000
Outside radius of the drill string (m)	0.10
Inside radius of the drill string (m)	0.08
Damping coefficients , (Ns/m)	8000
Damping coefficients , (Ns/m)	10000