Learning Forum

[r.abbasi]

Hi all,

I want to model this float with external linear damper(which value is N.s/m).

How can I do that?in connection there is no option in this case.I mean hinge is not appropriate in this case cause we have just heave.

and fender's damping unit is not like linear(and also there is nothing upside of the float to connect it to fender)

I would appreciate if anyone know and guide me eith this regard.

thank you

[Shuangxing Du]

Fender's damping force is linear to the retative velocity if the dender's stiffness is defined as linear (see Aqwa Theory manual, equation 9-89). As shown below you could define a pair of fenders in the opposite directions normal to the structure's contacting surface.

[r.abbasi]

Thnak you for your response. 

previously I found that we can put additional damping this way(with your guidance):

so what is the difference between this way and that way with two fenders as you suggest?

[Shuangxing Du]

Fender only provides the restoring force and damping force when it is in compression. By using a pair of fenders with the opposite normal directions, it will be allways one of them in compression.