ANSYS link11 1D actuator

[Giovanni P]

Hello everyone!
I'm using a link11 to simulate a 1D actuator that moves a mechanism and to model the whole system I just used beam188 mass21 and mpc184.
Unfortunately by now I cannot reach the target stroke on the actuator, the best that I can get out of this is
stroke.input(t)=sf*stroke.output(t)
where sf is an "strange" scaling factor. Obviously strange means that I cannot relate it to the K and D (stiffness and damping,) characteristic.
I already tried to insert a high and low stiffness for a sensitivity analysis, but I cannot get the meaning of the result.
Let say the system is something like this:

n,1
n,2,1
n,3,x,y,z
D,1,UX
D,1,UY
D,1,UZ
type,yyy,...
et,yyy
e,2,3
type,xxx,link11
r,xxx,stiffness,damping
et,xxx
e,1,2
sfe,2,1,pres,1,%stroke% !stroke is a time dependent table

Any suggestion about how to obtain sf=1?

Thank you ;-)

Anyone who attempts to generate random numbers by deterministic means is, of course, living in a state of sin.

 

[Giovanni P]

Ok I solved the sf problem debugging the script...
By now I'm working on a further confirmation:
1. analysis1: I extract the elastic force (FORCE1) of the actuator coming from a displacements (stroke1) controlled system
2. analysis2: I use this force (FORCE1) in a second analysis
3. I compare the initial displacements (stroke1) with the results of analysis2 (stroke2)

Is it correct to expect stroke1 to be equal to stroke2?
Obviously I'm posting this question because they don't match..

Thank you

Anyone who attempts to generate random numbers by deterministic means is, of course, living in a state of sin.