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

Table 5

Calculated parameters of Poisson’s ratio influence.

Name of parameters	Results
Poisson’s ratios of the drill string , ν1	0.10
Poisson’s ratios 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 coefficient (Ns/m)	10000