How to realize an "archimedean spiral" movement
How to realize an "archimedean spiral" movement
(OP)
Hey guys,
I would like to realize a special movement of my Reference Point in ABAQUS. It should follow a curve which is an "archimedean spiral".
My problem is that i don´t know how to realize a variable length of the radius dependent on the circular angle PHI. The radius r in a cartesian coord-system is as followed:
x-direction: a*PHI*cos(PHI)
y-direction: a*PHI*sin(PHI)
with thwe constant parameter "a"
Do you have any suggestion how to realize a movement like this? Becaus i don´t know how to realize a variable amplitude :(
Sorry for my bad english ;)
Thanks for your help !!!!
I would like to realize a special movement of my Reference Point in ABAQUS. It should follow a curve which is an "archimedean spiral".
My problem is that i don´t know how to realize a variable length of the radius dependent on the circular angle PHI. The radius r in a cartesian coord-system is as followed:
x-direction: a*PHI*cos(PHI)
y-direction: a*PHI*sin(PHI)
with thwe constant parameter "a"
Do you have any suggestion how to realize a movement like this? Becaus i don´t know how to realize a variable amplitude :(
Sorry for my bad english ;)
Thanks for your help !!!!





RE: How to realize an "archimedean spiral" movement
When you know before how the position changes with time, you can make tables x vs. t and y vs. t in Excel and use them as amplitudes.
Or you write a user subroutine.
RE: How to realize an "archimedean spiral" movement
Thanks Mustaine3 !
Yes i know the time at each Position. But how do i have to add severeal BC for one and the same RP? In the past i tried to create 2 different BC for one Mode ( one for U1 direction and another for U2 direction) Bug there was an error message that these two BC were in conflict to each other.
Or can i create 1 tabular amplidude witz 2 dependences ( x vs t and y vs t)? Bug how can i tell abaqus to use e.g. x vs t for U1 and y vs t for U2 ? Do you know what i mean?
RE: How to realize an "archimedean spiral" movement
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RE: How to realize an "archimedean spiral" movement
It works very well. Thats the same way i tried in the past, but it didn´t work. But know everything works. THANKS !!!!