N. drop

Stiffness

Preload level

0.097

0.124

0.206

0.344

1

K1

10.6

13.3

17.3

19.7

2

K2

18.1

20.8

23.5

26.1

3

K3

21.2

21.1

23.5

25.7

4

K4

21.3

22.3

23.2

25.4

5

K5

24.1

23.2

23.3

26.7