Good morning,
Trying to run my code I get this error, but do not understand where it comes from or what I have to check. What is the meaning of SPC ? MPC is multi point constraint?
*ERROR in cascade: the DOF corresponding to
node 1 in direction 3 is detected on the
dependent side of a MPC and a SPC
Thank you very much
SPC is Single Point Constraint (as opposed to MPC = Multi-Point Constraint) and in practice it just means a boundary condition (BC). So you have an overconstraint for that node in that degree of freedom (DOF). Apparently, there’s both BC and MPC (some constraint) applied there. MPCs are often generated internally by CalculiX.
Ok. May it be due to this? Coupling constraint and B.C. cannot be applied in the same node??
How can I do it?
*Coupling, Ref node=25491, Surface=RBE2_P_CNS, Constraint name=Constraint-pinion
*Kinematic
1,3
*Coupling, Ref node=25493, Surface=RBE2_G_CNS, Constraint name=Constraint-gear
*Kinematic
1,3
*Boundary, Amplitude=AMP_ROT
25491, 1, 2, 0
25491, 6, 6, 1.01000
25493, 1, 2, 0
25493, 6, 6, 0
No, you can apply BCs to ref nodes of kinematic coupling constraints:
The degrees of freedom in the reference node (1 up to 3 for translations, 4 up to 6 for rotations; they apply to the global system unless a *TRANSFORM card was defined for the reference node) can be constrained by a *BOUNDARY card.
Right. In that case what could I check?
I am quite blocked in solving this error and I do not know what to look at.
I shared my Model here. I have corrected some things but the main structure and B.C and constraints are the same.
I think that you should apply symmetry BC at the gear/pinion edges and the coupling to the shaft holes.
I also see inconsistent definitions, according to manual (*COUPLING keyword):
With SURFACE the nodes are selected to which the constraint applies (so-
called coupling nodes). This surface must be face-based.
the one for the pinion is node-based.
Thank you so much @JuanP74 for taking the time!!!
I think that you should apply symmetry BC at the gear/pinion edges and the coupling to the shaft holes.
Why this symetry BC? I do not understand very well what you mean…
also see inconsistent definitions, according to manual (*COUPLING keyword):
With SURFACE the nodes are selected to which the constraint applies (so-
called coupling nodes). This surface must be face-based.
the one for the pinion is node-based.
You’re right. I already corrected the definition of the surfaces based on elements in both gears. I misunderstood and thought the surface definitin by elements was only necessary for the *Distributing … but in fact is necessary when you define a *coupling constarint.
try placing these nodes only in one set, the contact surface or the coupling
I also deleted the corners nodes from the contact set, since there will never be contact in those corneers. That way those nodes will only be in the coupling surface set.
However after this, my simulation stops after 4 increments and I am not able to see the result of it or now which is the problem… since I get no .log file or…
Thank youu so much for any ideasor tips!
I made some improvements but isn’t finished. At least it completes first step with somewhat weird results.
Hope it helps you fixing the issue.
I think Disla here hit the point (except in that coupling3.inp is the interesting one to apply an enforced rotation), coupling, kinematic isn’t working exactly the way you expect because only dof’s 1 to 3 are allowed (contrary to Abaqus where 1 to 6 are allowed) so you need to use cylindrical coordinates to apply an enforced rotation/moment
**
** Structure: cantilever beam.
** Test objective: *COUPLING, *KINEMATIC for rotations.
**
*HEADING
Model: beam Date: 10-Mar-1998
*NODE
1, 0.000000, 0.000000, 0.000000
2, 1.000000, 0.000000, 0.000000
3, 1.000000, 1.000000, 0.000000
4, 0.000000, 1.000000, 0.000000
5, 0.000000, 0.000000, 8.000000
6, 1.000000, 0.000000, 8.000000
7, 1.000000, 1.000000, 8.000000
8, 0.000000, 1.000000, 8.000000
9, 0.250000, 0.000000, 0.000000
10, 0.500000, 0.000000, 0.000000
11, 0.750000, 0.000000, 0.000000
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184, 0.250000, 1.000000, 6.000000
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229, 0.750000, 0.500000, 2.000000
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252, 0.500000, 0.500000, 6.000000
253, 0.750000, 0.500000, 6.000000
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257, 0.250000, 0.500000, 7.000000
258, 0.500000, 0.500000, 7.000000
259, 0.750000, 0.500000, 7.000000
260, 0.500000, 0.750000, 7.000000
261, 0.500000, 0.500000, 7.500000
262,.5,.5,8.
*ELEMENT, TYPE=C3D20R , ELSET=Eall
1, 1, 10, 95, 19, 61, 105, 222, 192, 9, 93,
94, 20, 104, 220, 221, 193, 62, 103, 219, 190
2, 10, 2, 13, 95, 105, 34, 134, 222, 11, 12,
96, 93, 106, 133, 223, 220, 103, 33, 132, 219
3, 19, 95, 16, 4, 192, 222, 163, 79, 94, 97,
17, 18, 221, 224, 164, 191, 190, 219, 161, 78
4, 95, 13, 3, 16, 222, 134, 64, 163, 96, 14,
15, 97, 223, 135, 162, 224, 219, 132, 63, 161
5, 61, 105, 222, 192, 59, 109, 228, 196, 104, 220,
221, 193, 108, 226, 227, 197, 60, 107, 225, 194
6, 105, 34, 134, 222, 109, 36, 138, 228, 106, 133,
223, 220, 110, 137, 229, 226, 107, 35, 136, 225
7, 192, 222, 163, 79, 196, 228, 167, 81, 221, 224,
164, 191, 227, 230, 168, 195, 194, 225, 165, 80
8, 222, 134, 64, 163, 228, 138, 66, 167, 223, 135,
162, 224, 229, 139, 166, 230, 225, 136, 65, 165
9, 59, 109, 228, 196, 57, 113, 234, 200, 108, 226,
227, 197, 112, 232, 233, 201, 58, 111, 231, 198
10, 109, 36, 138, 228, 113, 38, 142, 234, 110, 137,
229, 226, 114, 141, 235, 232, 111, 37, 140, 231
11, 196, 228, 167, 81, 200, 234, 171, 83, 227, 230,
168, 195, 233, 236, 172, 199, 198, 231, 169, 82
12, 228, 138, 66, 167, 234, 142, 68, 171, 229, 139,
166, 230, 235, 143, 170, 236, 231, 140, 67, 169
13, 57, 113, 234, 200, 55, 117, 240, 204, 112, 232,
233, 201, 116, 238, 239, 205, 56, 115, 237, 202
14, 113, 38, 142, 234, 117, 40, 146, 240, 114, 141,
235, 232, 118, 145, 241, 238, 115, 39, 144, 237
15, 200, 234, 171, 83, 204, 240, 175, 85, 233, 236,
172, 199, 239, 242, 176, 203, 202, 237, 173, 84
16, 234, 142, 68, 171, 240, 146, 70, 175, 235, 143,
170, 236, 241, 147, 174, 242, 237, 144, 69, 173
17, 55, 117, 240, 204, 53, 121, 246, 208, 116, 238,
239, 205, 120, 244, 245, 209, 54, 119, 243, 206
18, 117, 40, 146, 240, 121, 42, 150, 246, 118, 145,
241, 238, 122, 149, 247, 244, 119, 41, 148, 243
19, 204, 240, 175, 85, 208, 246, 179, 87, 239, 242,
176, 203, 245, 248, 180, 207, 206, 243, 177, 86
20, 240, 146, 70, 175, 246, 150, 72, 179, 241, 147,
174, 242, 247, 151, 178, 248, 243, 148, 71, 177
21, 53, 121, 246, 208, 51, 125, 252, 212, 120, 244,
245, 209, 124, 250, 251, 213, 52, 123, 249, 210
22, 121, 42, 150, 246, 125, 44, 154, 252, 122, 149,
247, 244, 126, 153, 253, 250, 123, 43, 152, 249
23, 208, 246, 179, 87, 212, 252, 183, 89, 245, 248,
180, 207, 251, 254, 184, 211, 210, 249, 181, 88
24, 246, 150, 72, 179, 252, 154, 74, 183, 247, 151,
178, 248, 253, 155, 182, 254, 249, 152, 73, 181
25, 51, 125, 252, 212, 49, 129, 258, 216, 124, 250,
251, 213, 128, 256, 257, 217, 50, 127, 255, 214
26, 125, 44, 154, 252, 129, 46, 158, 258, 126, 153,
253, 250, 130, 157, 259, 256, 127, 45, 156, 255
27, 212, 252, 183, 89, 216, 258, 187, 91, 251, 254,
184, 211, 257, 260, 188, 215, 214, 255, 185, 90
28, 252, 154, 74, 183, 258, 158, 76, 187, 253, 155,
182, 254, 259, 159, 186, 260, 255, 156, 75, 185
29, 49, 129, 258, 216, 5, 22, 100, 31, 128, 256,
257, 217, 21, 98, 99, 32, 48, 131, 261, 218
30, 129, 46, 158, 258, 22, 6, 25, 100, 130, 157,
259, 256, 23, 24, 101, 98, 131, 47, 160, 261
31, 216, 258, 187, 91, 31, 100, 28, 8, 257, 260,
188, 215, 99, 102, 29, 30, 218, 261, 189, 92
32, 258, 158, 76, 187, 100, 25, 7, 28, 259, 159,
186, 260, 101, 26, 27, 102, 261, 160, 77, 189
*NSET, NSET=FIX
97, 96, 95, 94, 93, 20, 19, 18, 17, 16, 15,
14, 13, 12, 11, 10, 9, 4, 3, 2, 1
*BOUNDARY
FIX, 1
*BOUNDARY
FIX, 2
*BOUNDARY
FIX, 3
*NSET,NSET=Nall,GENERATE
1,261
*MATERIAL,NAME=EL
*ELASTIC
210000.0, .3
*SOLID SECTION,ELSET=Eall,MATERIAL=EL
*NSET,NSET=LOAD
5,6,7,8,22,25,28,31,100
*SURFACE, NAME=S1
29,S2
30,S2
31,S2
32,S2
*ORIENTATION,NAME=OR1,SYSTEM=CYLINDRICAL
.5,.5,0.,.5,.5,1.
**0.,0.,0.,0.,0.,1.
*COUPLING,REF NODE=262,SURFACE=S1,ORIENTATION=OR1,CONSTRAINT NAME=CN1
*KINEMATIC
2
*STEP
*STATIC
*BOUNDARY
262,6,6,.01
*SECTION PRINT,SURFACE=S1,NAME=SP1
SOF,SOM
*el file
s,e
*NODE file
u
*END STEP
the example shows a beam with a torsional rotation in the end, basically what you intend to do with the gears, but only restrained by the contact between pinion and gear.
There are some working examples showing how to induce rotations in the mecway forum.
I posted one with less than 1000 nodes that can be run in the free version. It’s old and could be better but it’s still there.
Sebastianmaklary and JohanM users also provided valuable information based on his experience with gears design.
similar problem also discussed in PrePoMax forums