Table 2.

Obtained effective coupling stiffness.

${\mathit{V}}_2^2-{\mathit{V}}_1^2$ [V2]	kc [N/m] (Anti-Phase)	kc [N/m] (In-Phase)
0	$-2.35$	$-1.58$
500	$-1.81$	$-1.54$
1000	$-1.25$	$-1.10$
1500	$-0.52$	$-0.47$
1685	$-0.43$	$-0.39$
1816	0.22	0.16
2000	0.17	0.05
2500	0.71	0.58
3000	1.43	1.12
3132	1.57	1.22