Hello everyone, thank you for letting me join. I’m new to PrePoMax and I’d like to ask for your help.
I’m simulating this situation, but i need to make sure that both parts rotate around the same point. They can universally traslate in the space but cannot traslate relatively one to the other.
To create this hinge i did this:
- created two reference point as middle points
- linked the holesto their relative surface using Rigid Body costrain.
Then I wanted to add an equation on Calculix (Never eved used it…) adding the following (not in a specific place of the ode, under element sets:
*EQUATION
3
273265,1,1., 273267,1,-1.
273265,2,1., 273267,2,-1.
273265,3,1., 273267,3,-1.
So three equations for the 3 directions: X,Y and Z. No need to lock any rotation.
Where:
- 273265 and 273267 are the two reference points
- 1,2,3 are the three directions
- 1 and -1 to make sure that the equations equal to 0 (i’ve looked on some Calculix forum (TOPIC [No Convergence: *STATIC vs *DYNAMIC with *RIGID BODY and SPRING2 for joints]), I’ve found a video with a similar situation.
The idea is that:
U1=U2 → U1-U2=0
V1=V2 → V1-V2=0
W1=W2 → W1-W2=0
So:
First knot, direction 1,module 1., Second knot, direction 1,module -1.
First knot, direction 2,module 1., Second knot, direction 2,module -1.
First knot, direction 3,module 1., Second knot, direction 3,module -1.
Tried to run, but the following shows up:
**
*ERROR reading *EQUATION: mpc definition 1
is not complete.
*ERROR reading *EQUATION. Card image:
*SOLIDSECTION,ELSET=INTERNAL_SELECTION-1_STRUTTURA,MATERIAL=16NICR4
**
→ *I’ve tried running it before and the error was different “ERROR reading increase memmpc_”
So my questions are the following:
1- Is “Equation” on the right code line or it should be placed elsewhere?
2- What do these errors mean?
3- Do you think the equation i’m writing is right for these condition?
Thank you so much in advance, as i said before i’ve never used this soft and i’m absolutely lost.
