Hello,
I am a beginner of LIGGGHTS. I am troubled by the meaning and effect of the keyword com in servo command
eg:
fix x0 all mesh/surface/stress/servo file meshes/x_0.stl type 1 scale 1 com 0.5 0.5 0.5 ctrlPV force axis 1.0 0.0 0.0 target_val 5e4 vel_max 1
In the document, the com was described as the center of mass. I do not understand what it does. I try to change its value, but it seems to get
the same result.
Can anyone help me?
Thank you!
Wang Xiukai
mschramm | Wed, 03/24/2021 - 04:35
com
COM is the Center Of Mass of the mesh.
I do not think it is used in the PUBLIC release.
It would have a use in the Private release since you can have meshes with 6 degrees of freedom.
deepakpawar.2310 | Thu, 03/25/2021 - 12:32
I guess you need to give the
I guess you need to give the exact geometrical centroidal point of the mesh.
Earlier I also got confused with the COM term for the mesh.
Thao | Mon, 04/25/2022 - 13:12
Influence of vel_max and kp on servo walls
HI guys,
On a related topic about the meaning of terms used in the servo wall, do you know how to get an appropriate value for vel_max and kp? Anytime that I changed these values, my servo_wall forces change significantly although the target_force applied is the same. I have no idea why is that?
Thanks so much.
Thao