Design and Simulation of a Damper with Negative Stiffness for Vibration Mitigation from Drilling Equipment to a Semi-Submersible Platform

Table 3

The theoretical model of the hysteresis behavior of eccentric columns.

Phase	Axial force	Stiffness
0–2
2-3	,
3-4	—	—
4-5-6		0
6-1	—	—
1-0